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Wang Z, Huang Z, Yu J, Shao X, Peng W, Yu J, Jiang Y. Growth of Ag/g-C 3N 4 nanocomposites on nickel foam to enhance photocatalytic degradation of formaldehyde under visible light. J Environ Sci (China) 2024; 137:432-442. [PMID: 37980028 DOI: 10.1016/j.jes.2023.02.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 01/20/2023] [Accepted: 02/01/2023] [Indexed: 11/20/2023]
Abstract
Formaldehyde is a pollutant that significantly affects the indoor air quality. However, conventional remediation approaches can be challenging to deal with low-concentration formaldehyde in an indoor environment. In this study, Photocatalysts of Ag/graphitic carbon nitride (g-C3N4)/Ni with 3D reticulated coral structure were prepared by thermal polymerization and liquid phase photo-deposition, using nickel foam (NF) as the carrier. Experiments demonstrated that when the Ag concentration was 3%, and the relative humidity was 60%, the Ni/Ag/g-C3N4 showed the maximum degradation rate of formaldehyde at 90.19% under visible light irradiation, and the formaldehyde concentration after degradation was lower than the Hygienic standard stated by the Chinese Government. The porous structure of Ni/Ag/g-C3N4 and the formation of Schottky junctions promoted the Adsorption efficiency and degradation of formaldehyde, while the nickel foam carrier effectively promoted the desorption of degradation products. Meanwhile, the degradation rate was only reduced by 3.4% after 16 recycles, the three-dimensional porous structure extended the lifetime of the photocatalyst. This study provides a new strategy for the degradation of indoor formaldehyde at low concentrations.
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Affiliation(s)
- Ze Wang
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Zhi Huang
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Jiang Yu
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu 610065, China; Yibin Institute of Industrial Technology, Sichuan University, Yibin 644000, China.
| | - Xiao Shao
- School of Agriculture and Environment, University of Western Australia, Perth 6907, Western Australia, Australia
| | - Weidong Peng
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Jie Yu
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Yinying Jiang
- Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China; Yibin Institute of Industrial Technology, Sichuan University, Yibin 644000, China
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2
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Shao B, Wu X, Shi K, Zhao Y, Huang J, Zhou W, Cai M, Guo L. Surface plasma modification of cellulose acetate fiber filter for the adsorption of typical components in smoke components. RSC Adv 2024; 14:872-877. [PMID: 38174286 PMCID: PMC10759168 DOI: 10.1039/d3ra07624e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 12/15/2023] [Indexed: 01/05/2024] Open
Abstract
Surface modification of cellulose acetate filter rods with low temperature plasma was performed to explore the retention and adsorption effect of modified filter rods on typical components (CO, H2O, benzene, and formaldehyde) in cigarette smoke. The surface structure and composition of the cellulose acetate filter rods were modified by changing the plasma treatment time. The modified filter rods were characterized by N2 physical adsorption (BET), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), contact angle of H2O, Fourier transform infrared spectroscopy (FTIR) and in situ DRIFTS. Various functional groups were found on the surface of filter rods with the introduction of plasma modification, which exhibited strong retention performance for water vapor in cigarette smoke at room temperature and significantly enhanced adsorption for harmful substances (CO, benzene, and formaldehyde) in cigarette smoke.
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Affiliation(s)
- Baoxin Shao
- Gansu Tobacco Industry Company Limited Lanzhou 730050 China
| | - Xing Wu
- Gansu Tobacco Industry Company Limited Lanzhou 730050 China
| | - Kangzhong Shi
- Eastman Shuangwei Fibers Company Limited Hefei 230601 China
| | - Ying Zhao
- Eastman Shuangwei Fibers Company Limited Hefei 230601 China
| | - Jie Huang
- Chemistry and Chemical Engineering, Anhui University School Hefei 230601 China
| | - Wenjie Zhou
- Chemistry and Chemical Engineering, Anhui University School Hefei 230601 China
| | - Mengdie Cai
- Chemistry and Chemical Engineering, Anhui University School Hefei 230601 China
| | - Lisheng Guo
- Chemistry and Chemical Engineering, Anhui University School Hefei 230601 China
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3
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Zhang S, Sun S, Huang B, Wang N, Li X. UV-Enhanced Formaldehyde Sensor Using Hollow In 2O 3@TiO 2 Double-Layer Nanospheres at Room Temperature. ACS APPLIED MATERIALS & INTERFACES 2023; 15:4329-4342. [PMID: 36623169 DOI: 10.1021/acsami.2c19722] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Hollow In2O3@TiO2 double-layer nanospheres were prepared via a facile water bath method using the sacrifice template of carbon nanospheres. It is shown that the size of the In2O3/TiO2 nanocomposites is 150-250 nm, the thickness of the In2O3 shell is about 10 nm, and the thickness of the TiO2 shell is about 15 nm. The sensing performances of the synthesized In2O3/TiO2 nanocomposites-based chemiresistive-type sensor to formaldehyde (HCHO) gas under UV light activation at room temperature have been studied. Compared to the pure In2O3- and pure TiO2-based sensors, the In2O3/TiO2 nanocomposite sensor exhibits much better sensing performances to formaldehyde. The response of the In2O3/TiO2 nanocomposite-based sensor to 1 ppm formaldehyde is about 3.8, and the response time and recovery time are 28 and 50 s, respectively. The detectable formaldehyde concentration can reach as low as 0.06 ppm. The role of the formed In2O3/TiO2 heterojunctions and the involved chemical reactions activated by UV light have been investigated by AC impedance spectroscopy and the in situ diffuse reflectance Fourier transform infrared spectroscopy. The improvement of the sensing properties of In2O3/TiO2 nanocomposites could be attributed to the nanoheterojunctions between the two components and the "combined photocatalytic effects" of UV-light-emitting diode irradiation. Density functional theory calculations demonstrated that introducing heterojunctions could improve the adsorption energy and charge transfer between formaldehyde and sensing materials.
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Affiliation(s)
- Su Zhang
- School of Microelectronics, Center for Semiconductor Sensors and Integrated Microsystem, Dalian University of Technology, Dalian, Liaoning116024, P. R. China
| | - Shupeng Sun
- School of Microelectronics, Center for Semiconductor Sensors and Integrated Microsystem, Dalian University of Technology, Dalian, Liaoning116024, P. R. China
| | - Baoyu Huang
- School of Microelectronics, Center for Semiconductor Sensors and Integrated Microsystem, Dalian University of Technology, Dalian, Liaoning116024, P. R. China
| | - Nan Wang
- School of Microelectronics, Center for Semiconductor Sensors and Integrated Microsystem, Dalian University of Technology, Dalian, Liaoning116024, P. R. China
| | - Xiaogan Li
- School of Microelectronics, Center for Semiconductor Sensors and Integrated Microsystem, Dalian University of Technology, Dalian, Liaoning116024, P. R. China
- Key Laboratory of Integrated Circuit and Biomedical Electronic System, Dalian University of Technology, Dalian, Liaoning116023, P. R. China
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4
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Liu X, Zhang X, Chen W. Pd Nanoparticles Supported on N-Doped TiO 2 Nanosheets: Crystal Facets, Defective Sites, and Metal-Support Interactions Boost Reforming of Formaldehyde Solution for Hydrogen Production. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:13532-13542. [PMID: 36300888 DOI: 10.1021/acs.langmuir.2c02111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
To produce H2 from formaldehyde (HCHO), dehydrogenation offers an alternative approach to future hydrogen-based energy sources, but the unsatisfactory efficiency hinders its practical application. Here, ultrafine Pd nanoparticle (NP) decorated N-doped TiO2 nanosheets exposed with (001) facet catalysts (denoted as Pd/TiO2-x) have been prepared and exhibit superior H2 production performance from alkaline HCHO aqueous solution. Under our current conditions, the Pd/TiO2-x catalyst with a Pd loading of 1 wt % exhibits a H2 production rate of 183.77 mL/min/g, which is 1.75 and 3.66 times that of Pd/TiO2 and Pd NPs, respectively. Based on the results of Fourier transform infrared spectroscopy (FTIR), Raman, and liquid-phase electron paramagnetic resonance (EPR) spin-trapping experiments, the excellent H2 generation of Pd/TiO2-x can be attributed to the synergistic contribution among the reactive crystal facets, defective sites, and metal-support interactions in boosting the breakage of C-H bonds in HCHO, dissociation of H2O, and ultimately the formation of H2. This work is expected to provide a paradigm of an efficient catalyst to produce H2 from HCHO/H2O solution.
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Affiliation(s)
- Xiaogang Liu
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan464000, China
- Henan Province Key Laboratory of Utilization of Non-Metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang, Henan464000, China
- Xinyang Key Laboratory of Low-Carbon Energy Materials, Xinyang Normal University, Xinyang464000, China
| | - Xin Zhang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan464000, China
| | - Wenjie Chen
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang, Henan464000, China
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5
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Sayago I, Santos JP, Sánchez-Vicente C. The Effect of Rare Earths on the Response of Photo UV-Activate ZnO Gas Sensors. SENSORS (BASEL, SWITZERLAND) 2022; 22:8150. [PMID: 36365849 PMCID: PMC9658068 DOI: 10.3390/s22218150] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 10/19/2022] [Accepted: 10/20/2022] [Indexed: 06/16/2023]
Abstract
In this work, ZnO nanoparticle resistive sensors decorated with rare earths (REs; including Er, Tb, Eu and Dy) were used at room temperature to detect atmospheric pollutant gases (NO2, CO and CH4). Sensitive films were prepared by drop casting from aqueous solutions of ZnO nanoparticles (NPs) and trivalent RE ions. The sensors were continuously illuminated by ultraviolet light during the detection processes. The effect of photoactivation of the sensitive films was studied, as well as the influence of humidity on the response of the sensors to polluting gases. Comparative studies on the detection properties of the sensors showed how the presence of REs increased the response to the gases detected. Low concentrations of pollutant gases (50 ppb NO2, 1 ppm CO and 3 ppm CH4) were detected at room temperature. The detection mechanisms were then discussed in terms of the possible oxidation-reduction (redox) reaction in both dry and humid air atmospheres.
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6
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Peng WX, Yue X, Chen H, Ma NL, Quan Z, Yu Q, Wei Z, Guan R, Lam SS, Rinklebe J, Zhang D, Zhang B, Bolan N, Kirkham MB, Sonne C. A review of plants formaldehyde metabolism: Implications for hazardous emissions and phytoremediation. JOURNAL OF HAZARDOUS MATERIALS 2022; 436:129304. [PMID: 35739801 DOI: 10.1016/j.jhazmat.2022.129304] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 05/20/2022] [Accepted: 06/02/2022] [Indexed: 06/15/2023]
Abstract
The wide use of hazardous formaldehyde (CH2O) in disinfections, adhesives and wood-based furniture leads to undesirable emissions to indoor environments. This is highly problematic as formaldehyde is a highly hazardous and toxic compound present in both liquid and gaseous form. The majority of gaseous and atmospheric formaldehyde derive from microbial and plant decomposition. However, plants also reversibly absorb formaldehyde released from for example indoor structural materials in such as furniture, thus offering beneficial phytoremediation properties. Here we provide the first comprehensive review of plant formaldehyde metabolism, physiology and remediation focusing on release and absorption including species-specific differences for maintaining indoor environmental air quality standards. Phytoremediation depends on rhizosphere, temperature, humidity and season and future indoor formaldehyde remediation therefore need to take these biological factors into account including the balance between emission and phytoremediation. This would pave the road for remediation of formaldehyde air pollution and improve planetary health through several of the UN Sustainable Development Goals.
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Affiliation(s)
- Wan-Xi Peng
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
| | - Xiaochen Yue
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
| | - Huiling Chen
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
| | - Nyuk Ling Ma
- Faculty of Science & Marine Environment, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia
| | - Zhou Quan
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
| | - Qing Yu
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
| | - Zihan Wei
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
| | - Ruirui Guan
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
| | - Su Shiung Lam
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China; Pyrolysis Technology Research Group, Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia; Sustainability Cluster, School of Engineering, University of Petroleum & Energy Studies, Dehradun, Uttarakhand 248007, India.
| | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water, and Waste-Management, Soil, and Groundwater-Management, Pauluskirchstraße 7, 42285 Wuppertal, Germany; International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS), Shoolini University, Solan 173212, Himachal Pradesh, India
| | - Dangquan Zhang
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
| | - Baohong Zhang
- Department of Biology, East Carolina University, Greenville, NC 27858, USA
| | - Nanthi Bolan
- UWA School of Agriculture and Environment, The UWA Institute of Agriculture, M079, Perth WA 6009, Australia; The UWA Institute of Agriculture, The University of Western Australia, Perth, WA 6001, Australia
| | - M B Kirkham
- Department of Agronomy, Kansas State University, Manhattan, KS, USA
| | - Christian Sonne
- Henan Province Engineering Research Center for Biomass Value-added Products, Forestry College, Henan Agricultural University, Zhengzhou 450002, People's Republic of China; Aarhus University, Department of Bioscience, Arctic Research Centre (ARC), Frederiksborgvej 399, PO Box 358, DK-4000 Roskilde, Denmark; Sustainability Cluster, School of Engineering, University of Petroleum & Energy Studies, Dehradun, Uttarakhand 248007, India.
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7
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Yuan W, Wu Y, Qi T, Wan Y, Zhang S, zhang B, Zhou H, Shi L, Peng G, Shi S. Novel B and N Sites of One-Dimensional Boron Nitride Fiber: Efficient Performance and Mechanism in the Formaldehyde Capture Process. ACS OMEGA 2022; 7:25686-25692. [PMID: 35910171 PMCID: PMC9330137 DOI: 10.1021/acsomega.2c02920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 07/05/2022] [Indexed: 06/15/2023]
Abstract
Identification of adsorption centers with atomic levels of adsorbents is crucial to study the adsorption of formaldehyde (HCHO), especially for an in-depth understanding of the mechanism of HCHO capture. Herein, we investigate the HCHO adsorption performance of one-dimensional (1D) nanoporous boron nitride (BN) fiber, and explore the adsorption mechanism by density functional theory (DFT) calculations, including adsorption energy change and Bader charge change, and experimental study as well. Research shows that the 1D nanoporous BN fiber possesses a high concentration of Lewis pairs, which act as Lewis acid and Lewis base sites associated with the fiber's electron-deficient and electron-rich features. It is worth noting that the HCHO removal efficiency of a typical sample is as high as 91%. This work may open the door to the field of adsorption of other pollutants by constructing Lewis pairs in the future.
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Affiliation(s)
- Wenjing Yuan
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, People’s Republic of China
- Jiangxi
Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou 341119, People’s Republic of China
| | - Yaoyao Wu
- School
of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, People’s Republic
of China
| | - Tao Qi
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, People’s Republic of China
- Jiangxi
Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou 341119, People’s Republic of China
- Institute
of Process Engineering, Chinese Academy
of Sciences, Beijing 100190, People’s Republic of China
| | - Yinhua Wan
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, People’s Republic of China
- Jiangxi
Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou 341119, People’s Republic of China
- Institute
of Process Engineering, Chinese Academy
of Sciences, Beijing 100190, People’s Republic of China
| | - Shuping Zhang
- School
of Chemical Engineering and Materials, Changzhou
Institute of Technology, Changzhou 213032, People’s Republic
of China
| | - Baozhi zhang
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, People’s Republic of China
- Jiangxi
Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou 341119, People’s Republic of China
| | - Hengcheng Zhou
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, People’s Republic of China
- Jiangxi
Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou 341119, People’s Republic of China
| | - Lili Shi
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, People’s Republic of China
- Jiangxi
Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou 341119, People’s Republic of China
| | - Guan Peng
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, People’s Republic of China
- Jiangxi
Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou 341119, People’s Republic of China
| | - Shaoyuan Shi
- Ganjiang
Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, People’s Republic of China
- Jiangxi
Province Key Laboratory of Cleaner Production of Rare Earths, Ganzhou 341119, People’s Republic of China
- Institute
of Process Engineering, Chinese Academy
of Sciences, Beijing 100190, People’s Republic of China
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8
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Høyer NM, Johnson MS, Mikkelsen KV. Perturbation of the UV transitions of formaldehyde by TiO 2 photocatalysts and Au n nanoclusters. Phys Chem Chem Phys 2022; 24:11395-11411. [PMID: 35503101 DOI: 10.1039/d1cp05820g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the gas phase, formaldehyde has an electric-dipole forbidden transition that becomes allowed by vibronic coupling. In this paper we explore whether perturbation by surfaces could also enhance light absorption by CH2O. We investigate the electronic transitions of formaldehyde in the gas phase and interacting with rutile (110) TiO2, Aun nanoclusters, and Aun on (110)-TiO2. These surfaces are chosen as being representative of metals and metal-oxide minerals, and also because of specific interest in photocatalysts and noble metal nanocluster catalysts. The oscillator strength of the forbidden n → π* transition of formaldehyde in vacuum is investigated by modelling vibrational coupling to the electronic transition with equation-of-motion coupled cluster theory. The excitation energies and oscillator strengths of formaldehyde are calculated for different orientations and distances to the surfaces using the coupled cluster singles and doubles linear response method within the Quantum Mechanical and Molecular Mechanical (QM/MM) model using the aug-cc-pVTZ basis set and compared with the values calculated in vacuo. The electronic transitions of formaldehyde vary very little when placed near a pure TiO2-surface with only minor variations depending on the orientation of formaldehyde. Introducing a gold nanoparticle (by itself or supported by TiO2) induces dramatic changes in the absorption properties. This is due to vibronic interactions and the effect of the broken symmetry on the n → π* transition. We see a large redshift in the transition of 90 nm and oscillator strengths larger than 1.0 × 10-4 for CH2O interacting with Aun.
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Affiliation(s)
- Nicolai Machholdt Høyer
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK 2100 Copenhagen Ø, Denmark.
| | - Matthew S Johnson
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK 2100 Copenhagen Ø, Denmark.
| | - Kurt V Mikkelsen
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK 2100 Copenhagen Ø, Denmark.
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9
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Dong J, Li Q, Xia W, Lv B, Jing G, Shen H, Yuan CS. Improvement of water resistance by Fe 2O 3/TiO 2 photoelectrocatalysts for formaldehyde removal: experimental and theoretical investigation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:13805-13821. [PMID: 34599445 DOI: 10.1007/s11356-021-16459-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 09/06/2021] [Indexed: 06/13/2023]
Abstract
TiO2-based photocatalysts are a potential technology for removing indoor formaldehyde (CHOH) owing to their strong photooxidation ability. However, their photooxidation performance is generally weakened when suffering from the competitive adsorption of H2O. In a method inspired by the oxygen evolution reaction (OER) to generate intermediates with hydroxyl radicals on the anode electrode catalysts, an electric field was employed in this research and applied to the photooxidation of CHOH to prevent the competitive adsorption of H2O. Additionally, 0.5-5% Fe2O3 decorated TiO2 was employed to improve the photoelectrocatalytic activity. The influence of an electric field on hydroxyl-radical production was investigated by both density functional theory (DFT) with direct-imposed dipole momentum and photoelectrocatalytic experimental tests. The surface characterization of the photocatalysts, including transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR), was conducted. DFT results show that a positive electric field with a strength of 0.05 Å/V was more favorable to produce hydroxyl on Fe2O3/TiO2(010) than was a negative electric field. Fe2O3 decoration can significantly boost hydroxyl formation, resulting from a decrease in the binding energy between the Fe of Fe2O3 and the oxygen and hydrogen atoms of H2O. The dissociated hydrogen atom of the H2O preferentially remained on the catalysts' surface rather than being released into the gas flow. The experimental results demonstrated that applying 150 V could not directly enhance the photooxidation of CHOH by either TiO2 or Fe2O3/TiO2 but that it could relieve the H2O inhibitory effect by more than 10% on the Fe2O3/TiO2.
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Affiliation(s)
- Jing Dong
- College of Chemical Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China
| | - Qing Li
- College of Chemical Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China
| | - Wenjie Xia
- Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND, USA
| | - Bihong Lv
- College of Chemical Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China
| | - Guohua Jing
- College of Chemical Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China
| | - Huazhen Shen
- College of Chemical Engineering, Huaqiao University, Xiamen, Fujian, People's Republic of China.
| | - Chung-Shin Yuan
- Institute of Environmental Engineering, National Sun Yat-sen University, No. 70, Lian-Hai Road, Kaohsiung, 804, Taiwan
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10
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Li M, Cheng Q, Shen C, Hong B, Jiang Y, Wei Y, Cai M, Chen J, Sun S. Piezoelectric built-in electric field advancing TiO 2 for highly efficient photocatalytic air purification. RSC Adv 2022; 12:22410-22415. [PMID: 36105997 PMCID: PMC9364438 DOI: 10.1039/d2ra03751c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Accepted: 07/27/2022] [Indexed: 11/24/2022] Open
Abstract
Photocatalytic air purification is a promising technology; however, it suffers from a limited rate of photocatalytic mineralization (easily inactivated surfactant sites of hydroxyls) and poor kinetics of degradation. Herein, we report a ferroelectric strategy, employing a polyvinylidene fluoride (PVDF) layer embedded with TiO2, where the polarization field of stretched PVDF dramatically enhances and stabilizes active adsorption sites for the promotion of charge separation. The F (−) and H (+) atomic layers with distinct local structures in stretched PVDF increase the electron cloud density around Ti which simultaneously promotes the dissociation of water to form hydroxyl groups which are easier to activate for adsorption of formaldehyde molecules. Besides, the ferroelectric field of stretched PVDF effectively separates the photogenerated charge carriers and facilitates the carriers' transportation of TiO2/PVDF. The optimal stretched TiO2/PVDF exhibits excellent photocatalytic mineralization for formaldehyde with considerable stability. This work may evolve the polarization field as a new method to enhance adsorption and activation of hydroxyls and disclose the mechanism by which hydroxyl radicals mineralize gaseous formaldehyde for photocatalytic air purification. Ferroelectric built-in electric fields were used for photocatalytic air purification, where the stretched PVDF dramatically enhances and stabilizes active adsorption sites.![]()
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Affiliation(s)
- Mengmeng Li
- School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui, 230601, China
| | - Qin Cheng
- School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui, 230601, China
| | - Cheng Shen
- School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui, 230601, China
| | - Bin Hong
- Hefei Innovation Research Institute, Beihang University, Hefei, Anhui, 230013, China
| | - Yong Jiang
- Shanghai Synchrotron Radiation Facility, Zhangjiang National Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Yuxue Wei
- School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui, 230601, China
| | - Mengdie Cai
- School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui, 230601, China
| | - Jingshuai Chen
- School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui, 230601, China
| | - Song Sun
- School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui, 230601, China
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11
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Wang J, Li Y, Zhao J, Xiong Z, Zhao Y, Zhang J. PtCu alloy cocatalysts for efficient photocatalytic CO 2 reduction into CH 4 with 100% selectivity. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00048b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
In this paper, PtCu alloys with varying Pt/Cu ratios were deposited onto TiO2 nanocrystals to selectively photoreduce CO2 into CH4.
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Affiliation(s)
- Junyi Wang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Youzi Li
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jiangting Zhao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Zhuo Xiong
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yongchun Zhao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Junying Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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12
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Bourguignon M, Grignard B, Detrembleur C. Introducing Polyhydroxyurethane Hydrogels and Coatings for Formaldehyde Capture. ACS APPLIED MATERIALS & INTERFACES 2021; 13:54396-54408. [PMID: 34747169 DOI: 10.1021/acsami.1c16917] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Formaldehyde (FA) is a harmful chemical product largely used for producing resins found in our living spaces. Residual FA that leaches out the resin contributes to our indoor air pollution and causes some important health issues. Systems able to capture this volatile organic compound are highly desirable; however, traditional adsorbents are most often restricted to air filtration systems. Herein, we report novel waterborne coatings that are acting as a FA sponge for indoor air decontamination. These coatings, of the poly(hydroxyurethane) (PHU) type, rich in primary amine groups, are prepared by the polyaddition of a hydrosoluble dicyclic carbonate to a polyamine in water at room temperature under catalyst-free conditions. We highlight the importance of the choice of the polyamine on the curing rate of the formulation and on the FA capture ability of PHU. The excellent FA capturing ability of the best candidate is rationalized by investigating the action mode of the polyamine used to construct PHUs. With poly(vinyl amine), FA is covalently and permanently bound to PHU, with no release over time. The performance of the coating in FA abatement is impressive, with more than 90% of captured FA after one day of contact. The facility to prepare these transparent and colorless coatings from waterborne formulations gives access to new efficient indoor air depolluting solutions, potentially applicable to various surfaces of our living spaces (wall, ceiling, etc.).
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Affiliation(s)
- Maxime Bourguignon
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, University of Liege, Chemistry Department, Sart-Tilman B6A, 4000 Liege, Belgium
| | - Bruno Grignard
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, University of Liege, Chemistry Department, Sart-Tilman B6A, 4000 Liege, Belgium
| | - Christophe Detrembleur
- Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, University of Liege, Chemistry Department, Sart-Tilman B6A, 4000 Liege, Belgium
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13
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Hao YC, Chen LW, Li J, Guo Y, Su X, Shu M, Zhang Q, Gao WY, Li S, Yu ZL, Gu L, Feng X, Yin AX, Si R, Zhang YW, Wang B, Yan CH. Metal-organic framework membranes with single-atomic centers for photocatalytic CO 2 and O 2 reduction. Nat Commun 2021; 12:2682. [PMID: 33976220 PMCID: PMC8113524 DOI: 10.1038/s41467-021-22991-7] [Citation(s) in RCA: 77] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 04/07/2021] [Indexed: 01/09/2023] Open
Abstract
The demand for sustainable energy has motivated the development of artificial photosynthesis. Yet the catalyst and reaction interface designs for directly fixing permanent gases (e.g. CO2, O2, N2) into liquid fuels are still challenged by slow mass transfer and sluggish catalytic kinetics at the gas-liquid-solid boundary. Here, we report that gas-permeable metal-organic framework (MOF) membranes can modify the electronic structures and catalytic properties of metal single-atoms (SAs) to promote the diffusion, activation, and reduction of gas molecules (e.g. CO2, O2) and produce liquid fuels under visible light and mild conditions. With Ir SAs as active centers, the defect-engineered MOF (e.g. activated NH2-UiO-66) particles can reduce CO2 to HCOOH with an apparent quantum efficiency (AQE) of 2.51% at 420 nm on the gas-liquid-solid reaction interface. With promoted gas diffusion at the porous gas-solid interfaces, the gas-permeable SA/MOF membranes can directly convert humid CO2 gas into HCOOH with a near-unity selectivity and a significantly increased AQE of 15.76% at 420 nm. A similar strategy can be applied to the photocatalytic O2-to-H2O2 conversions, suggesting the wide applicability of our catalyst and reaction interface designs. Photoreduction of permanent gas faces challenges in reactant diffusion and activation at the three-phase interface. Here the authors showed porous metal-organic framework membranes decorated by metal single atoms can boost the photoreduction of CO2 and O2 at the high-throughput gas-solid interface.
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Affiliation(s)
- Yu-Chen Hao
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China
| | - Li-Wei Chen
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China
| | - Jiani Li
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China
| | - Yu Guo
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, P. R. China
| | - Xin Su
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China
| | - Miao Shu
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, P. R. China
| | - Qinghua Zhang
- Institute of Physics, Chinese Academy of Sciences, Beijing, P. R. China
| | - Wen-Yan Gao
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China
| | - Siwu Li
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China
| | - Zi-Long Yu
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China
| | - Lin Gu
- Institute of Physics, Chinese Academy of Sciences, Beijing, P. R. China
| | - Xiao Feng
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China
| | - An-Xiang Yin
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China.
| | - Rui Si
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, P. R. China.
| | - Ya-Wen Zhang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, P. R. China
| | - Bo Wang
- Ministry of Education Key Laboratory of Cluster Science, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China. .,Advanced Technology Research Institute (Jinan), Beijing Institute of Technology, Jinan, P. R. China.
| | - Chun-Hua Yan
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, P. R. China
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Abstract
Recently, we have witnessed a booming development of composites and multi-dopant metal oxides to be employed as novel photocatalysts. Yet the practical application of photocatalysis for environmental purposes is still elusive. Concerns about the unknown fate and toxicity of nanoparticles, unsatisfactory performance in real conditions, mass transfer limitations and durability issues have so far discouraged investments in full-scale applications of photocatalysis. Herein, we provide a critical overview of the main challenges that are limiting large-scale application of photocatalysis in air and water/wastewater purification. We then discuss the main approaches reported in the literature to tackle these shortcomings, such as the design of photocatalytic reactors that retain the photocatalyst, the study of degradation of micropollutants in different water matrices, and the development of gas-phase reactors with optimized contact time and irradiation. Furthermore, we provide a critical analysis of research–practice gaps such as treatment of real water and air samples, degradation of pollutants with actual environmental concentrations, photocatalyst deactivation, and cost and environmental life-cycle assessment.
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15
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Wei Y, Wang A, Lv L, Xu F, Yang J, Cai M, Cheng Q, Chen J, Bao J, Gao C, Sun S. Synchrotron infrared spectroscopic high-throughput screening of multi-composite photocatalyst films for air purification. Catal Sci Technol 2021. [DOI: 10.1039/d0cy02223c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Synchrotron-based infrared microscope was used for the high-throughput screening of Fe3+/Nb5+ doped TiO2 photocatalysts for air purification.
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16
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Zhao M, Falak A, Tian Y, Yan L, Liu R, Chen W, Wang H, Wu T, Chen P, Chu W. Cu/graphene interdigitated electrodes with various copper thicknesses for UV-illumination-enhanced gas sensors at room temperature. Phys Chem Chem Phys 2020; 22:25769-25779. [PMID: 33147304 DOI: 10.1039/d0cp04405a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Effective detection of NO2 and NH3 gases at room temperature (RT) is critical for environmental monitoring and protection. Here, graphene-based gas sensors (Cu/Gr device) of single layer graphene decorated by 6, 8 and 10 nm thick Cu layers with graphene instead of conventional metal as interdigital electrodes are designed and fabricated. The RT performance for both NO2 and NH3 detection can be greatly enhanced by UV light illumination which is closely related to the thickness of Cu layers in which the device with 8 nm thickness (8 nm Cu/Gr device) exhibits the best performances. Analysis of XPS reveals that Cu is partly oxidized to Cu+ and Cu2+ for 6 nm with extra Cuδ+ (1 < δ < 2) for 8 and 10 nm. The contents and distributions of copper oxides and copper in Cu layers influence the catalytic effects and the heterojunction barrier and thus the performances. The RT responses of -30.9% and -8.1% for 5 and 0.3 ppm NO2, and of +29.1% and +5.9% for 105 and 10 ppm NH3 are achieved for the 8 nm Cu/Gr device, respectively. The limits of detection (LODs) for NO2 and NH3 are 12 ppb and 17 ppb, respectively. The sensing mechanisms are discussed in terms of density functional theory (DFT) calculations and energy band diagrams. The study demonstrates an effective solution of improving the device performance by modifying the device configuration and incorporating combined oxides naturally oxidized, which provides the novel design alternatives for high performance sensors.
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Affiliation(s)
- Min Zhao
- School of Information Engineering, Lingnan Normal University, Zhanjiang, Guangdong 524048, China.
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17
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Zhang X, Zhang C, Lin Q, Cheng B, Liu X, Peng F, Ren J. Preparation of Lignocellulose-Based Activated Carbon Paper as a Manganese Dioxide Carrier for Adsorption and in-situ Catalytic Degradation of Formaldehyde. Front Chem 2020; 7:808. [PMID: 31921757 PMCID: PMC6913189 DOI: 10.3389/fchem.2019.00808] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 11/08/2019] [Indexed: 11/13/2022] Open
Abstract
Formaldehyde is a colorless, highly toxic, and flammable gas that is harmful to human health. Recently, many efforts have been devoted to the application of activated carbon to absorb formaldehyde. In this work, lignocellulose-based activated carbon fiber paper (LACFP) loaded with manganese dioxide (MnO2) was fabricated for the adsorption and in-situ catalytic degradation of formaldehyde. LACFP was prepared by two-stage carbonization and activation of sisal hemp pulp-formed paper and was then impregnated with manganese sulfate (MnSO4) and potassium permanganate (KMnO4) solutions; MnO2 then formed by in situ growth on the LACFP base by calcination. The catalytic performance of MnO2-loaded LACFP for formaldehyde was then investigated. It was found that the suitable carbonization conditions were elevating the temperature first by raising it at 10°C/min from room temperature to 280°C, then at 2°C/min from 280 to 400°C, maintaining the temperature at 400°C for 1 h, and then increasing it quickly from 400 to 700°C at 15°C/min. The conditions used for activation were similar to those for carbonization, with the temperature additionally being held at 700°C for 2 h. The conditions mentioned above were optimized to maintain the fiber structure and shape integrity of the paper, being conducive to loading with catalytically active substances. Regarding the catalytic activity of MnO2-loaded LACFP, the concentration of formaldehyde decreased by 59 ± 6 ppm and the concentration of ΔCO2 increased by 75 ± 3 ppm when the reaction proceeded at room temperature for 10 h. The results indicated that MnO2-loaded LACFP could catalyze formaldehyde into non-toxic substances.
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Affiliation(s)
- Xiao Zhang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China
| | - Chunhui Zhang
- School of Light Industry and Engineering, South China University of Technology, Guangzhou, China
| | - Qixuan Lin
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China
| | - Banggui Cheng
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China
| | - Xinxin Liu
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China
| | - Feng Peng
- College of Materials Science and Technology, Institute of Biomass Chemistry and Technology, Beijing Forestry University, Beijing, China
| | - Junli Ren
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China
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18
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Nasriddinov A, Rumyantseva M, Marikutsa A, Gaskov A, Lee JH, Kim JH, Kim JY, Kim SS, Kim HW. Sub-ppm Formaldehyde Detection by n- n TiO 2@SnO 2 Nanocomposites. SENSORS (BASEL, SWITZERLAND) 2019; 19:E3182. [PMID: 31331010 PMCID: PMC6679342 DOI: 10.3390/s19143182] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 07/10/2019] [Accepted: 07/17/2019] [Indexed: 01/27/2023]
Abstract
Formaldehyde (HCHO) is an important indicator of indoor air quality and one of the markers for detecting lung cancer. Both medical and air quality applications require the detection of formaldehyde in the sub-ppm range. Nanocomposites SnO2/TiO2 are promising candidates for HCHO detection, both in dark conditions and under UV illumination. Nanocomposites TiO2@SnO2 were synthesized by ALD method using nanocrystalline SnO2 powder as a substrate for TiO2 layer growth. The microstructure and composition of the samples were characterized by ICP-MS, TEM, XRD and Raman spectroscopy methods. The active surface sites were investigated using FTIR and TPR-H2 methods. The mechanism of formaldehyde oxidation on the surface of semiconductor oxides was studied by in situ DRIFTS method. The sensor properties of nanocrystalline SnO2 and TiO2@SnO2 nanocomposites toward formaldehyde (0.06-0.6 ppm) were studied by in situ electrical conductivity measurements in dark conditions and under periodic UV illumination at 50-300 °C. Nanocomposites TiO2@SnO2 exhibit a higher sensor signal than SnO2 and a decrease in the optimal measurement temperature by 50 °C. This result is explained based on the model considering the formation of n-n heterocontact at the SnO2/TiO2 interface. UV illumination leads to a decrease in sensor response compared with that obtained in dark conditions because of the photodesorption of oxygen involved in the oxidation of formaldehyde.
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Affiliation(s)
- Abulkosim Nasriddinov
- Chemistry Department, Moscow State University, Moscow 119991 Russia
- Faculty of Materials Science, Moscow State University, Moscow 119991 Russia
| | | | - Artem Marikutsa
- Chemistry Department, Moscow State University, Moscow 119991 Russia
| | - Alexander Gaskov
- Chemistry Department, Moscow State University, Moscow 119991 Russia
| | - Jae-Hyoung Lee
- Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea
| | - Jae-Hun Kim
- Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea
| | - Jin-Young Kim
- Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea
| | - Sang Sub Kim
- Department of Materials Science and Engineering, Inha University, Incheon 22212, Korea
| | - Hyoun Woo Kim
- School of Materials Science and Engineering, Hanyang University, Seoul 04763, Korea
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19
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Chen B, Wu L, Wu B, Wang Z, Yu L, Crocker M, Zhu A, Shi C. Catalytic Materials for Low Concentration VOCs Removal through “Storage‐Regeneration” Cycling. ChemCatChem 2019. [DOI: 10.1002/cctc.201900581] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bingbing Chen
- State Key Laboratory of Fine Chemicals School of ChemistryDalian University of Technology Dalian China
| | - Le Wu
- State Key Laboratory of Fine Chemicals School of ChemistryDalian University of Technology Dalian China
| | - Bo Wu
- State Key Laboratory of Fine Chemicals School of ChemistryDalian University of Technology Dalian China
| | - Zhihui Wang
- State Key Laboratory of Fine Chemicals School of ChemistryDalian University of Technology Dalian China
| | - Limei Yu
- State Key Laboratory of Fine Chemicals School of ChemistryDalian University of Technology Dalian China
| | - Mark Crocker
- Center for Applied Energy Research Department of ChemistryUniversity of Kentucky Lexington, KY USA
| | - Aimin Zhu
- Laboratory of Plasma Physical ChemistryDalian University of Technology Dalian China
| | - Chuan Shi
- State Key Laboratory of Fine Chemicals School of ChemistryDalian University of Technology Dalian China
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20
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Li X, Sun Y, Zhang T, Bai Y, Lyu X, Cai W, Li Y. N-doping nanoporous carbon microspheres derived from MOFs for highly efficient removal of formaldehyde. NANOTECHNOLOGY 2019; 30:105702. [PMID: 30530950 DOI: 10.1088/1361-6528/aaf75b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Indoor formaldehyde (HCHO) removal is very important to reduce public health risk. Herein, we report a facile method for preparing N-doped nanoporous carbon through direct carbonization of metal-organic frameworks (ZIF-8) to remove harmful formaldehyde. The prepared N-doped nanoporous carbon exhibited uniform morphology and large specific surface area. Moreover, the type of N-functional groups on the N-doped nanoporous carbon had a dominant effect on its HCHO adsorption activity. As a result, HCHO adsorption capacity of the optimized N-doped nanoporous carbon was approximately five times higher than that of the commercially activated carbon. The detailed HCHO adsorption process, including physical adsorption and chemical adsorption, was also confirmed through in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). In addition, it should be noted that the N-doped nanoporous carbon exhibited high stability for HCHO adsorption, even after six adsorption cycles, indicating its good recyclability for long-term application. This study is expected to pave a way for expanding the environmental applications of the N-doped nanoporous carbon.
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Affiliation(s)
- Xinyang Li
- Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
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21
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Muñoz-Batista MJ, Ballari MM, Kubacka A, Alfano OM, Fernández-García M. Braiding kinetics and spectroscopy in photo-catalysis: the spectro-kinetic approach. Chem Soc Rev 2018; 48:637-682. [PMID: 30516217 DOI: 10.1039/c8cs00108a] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The combination of kinetic and spectroscopic tools has become a key scientific methodology for the understanding of catalytic behavior but its application in photocatalysis has inherent difficulties due to the nature of the energy source of the reaction. This review article provides an overview of its use by, first, presenting mechanistically derived kinetic formulations and spectroscopic data handling methods including intrinsic expressions for light and, second, highlighting representative examples of application. To do it we consider universal catalytic systems, particularly (although not exclusively) titania-based materials, and the most frequent hole and/or electron triggered reaction schemes. This review also provides a general framework to pave the way for the future progress of the spectro-kinetic approach in the photocatalysis area.
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Affiliation(s)
- Mario J Muñoz-Batista
- Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie, 2, 28049 Madrid, Spain. and Departamento de Química Orgánica, Universidad de Córdoba, Edif. Marie Curie, Ctra Nnal IV-A, Km 396, E14014, Córdoba, Spain
| | - María M Ballari
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC, UNL-CONICET), Güemes 3450, 3000, Santa Fe, Argentina.
| | - Anna Kubacka
- Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie, 2, 28049 Madrid, Spain.
| | - Orlando M Alfano
- Instituto de Desarrollo Tecnológico para la Industria Química (INTEC, UNL-CONICET), Güemes 3450, 3000, Santa Fe, Argentina.
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22
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Jedsukontorn T, Ueno T, Saito N, Hunsom M. Mechanistic aspect based on the role of reactive oxidizing species (ROS) in macroscopic level on the glycerol photooxidation over defected and defected-free TiO2. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.08.030] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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23
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Wei D, Xie J, Tong DG. Amorphous Europium Hexaboride: A Potential Room Temperature Formaldehyde Sensing Material. ACS APPLIED MATERIALS & INTERFACES 2018; 10:35681-35684. [PMID: 30286288 DOI: 10.1021/acsami.8b13234] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Amorphous EuB6 was successfully prepared having a high specific surface area (221.3 m2 g-1) via the reaction between EuCl3 and B2H6 in the presence of liquid plasma in an ionic liquid environment. The material exhibits an immediate, lasting, and highly selective response toward formaldehyde at room temperature with a detection limit of 50 ppb. The good sensing performance of the amorphous EuB6 material is attributed to the strong interaction between formaldehyde and the increased number of accessible electron-rich surface Eu sites.
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Affiliation(s)
- Da Wei
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection , Chengdu University of Technology , Chengdu 610059 , China
- Collaborative Innovation Center of Panxi Strategic Mineral Resources Multi-purpose Utilization, College of Materials and Chemistry & Chemical Engineering , Chengdu University of Technology , Chengdu 610059 , China
| | - Jia Xie
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection , Chengdu University of Technology , Chengdu 610059 , China
- Collaborative Innovation Center of Panxi Strategic Mineral Resources Multi-purpose Utilization, College of Materials and Chemistry & Chemical Engineering , Chengdu University of Technology , Chengdu 610059 , China
| | - Dong Ge Tong
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection , Chengdu University of Technology , Chengdu 610059 , China
- Collaborative Innovation Center of Panxi Strategic Mineral Resources Multi-purpose Utilization, College of Materials and Chemistry & Chemical Engineering , Chengdu University of Technology , Chengdu 610059 , China
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24
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de Luna MDG, Laciste MT, Tolosa NC, Lu MC. Effect of catalyst calcination temperature in the visible light photocatalytic oxidation of gaseous formaldehyde by multi-element doped titanium dioxide. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:15216-15225. [PMID: 29560594 DOI: 10.1007/s11356-018-1720-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Accepted: 03/12/2018] [Indexed: 06/08/2023]
Abstract
The present study investigates the influence of calcination temperature on the properties and photoactivity of multi-element doped TiO2. The photocatalysts were prepared by incorporating silver (Ag), fluorine (F), nitrogen (N), and tungsten (W) into the TiO2 structure via the sol-gel method. Spectroscopic techniques were used to elucidate the correlation between the structural and optical properties of the doped photocatalyst and its photoactivity. XRD results showed that the mean crystallite size increased for undoped photocatalysts and decreased for the doped photocatalysts when calcination was done at higher temperatures. UV-Vis spectra showed that the absorption cut-off wavelength shifted towards the visible light region for the as-synthesized photocatalysts and band gap narrowing was attributed to multi-element doping and calcination. FTIR spectra results showed the shifting of OH-bending absorption bands towards increasing wave numbers. The activity of the photocatalysts was evaluated in terms of gaseous formaldehyde removal under visible light irradiation. The highest photocatalytic removal of gaseous formaldehyde was found at 88%. The study confirms the effectiveness of multi-element doped TiO2 to remove gaseous formaldehyde in air by visible light photocatalysis and the results have a lot of potential to extend the application to other organic air contaminants.
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Affiliation(s)
- Mark Daniel G de Luna
- Department of Chemical Engineering, University of the Philippines, Diliman, 1101, Quezon City, Philippines
- Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines, Diliman, 1101, Quezon City, Philippines
| | - Maricris T Laciste
- Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines, Diliman, 1101, Quezon City, Philippines
- Environmental Research and Laboratory Services Division, Environmental Management Bureau, Department of Environment and Natural Resources, 1101, Quezon City, Philippines
| | - Nolan C Tolosa
- Environmental Engineering Program, National Graduate School of Engineering, University of the Philippines, Diliman, 1101, Quezon City, Philippines
| | - Ming-Chun Lu
- Department of Environmental Resources Management, Chia Nan University of Pharmacy and Science, Tainan, 71710, Taiwan.
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25
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Tan TH, Scott JA, Ng YH, Taylor RA, Aguey-Zinsou KF, Amal R. Plasmon enhanced selective electronic pathways in TiO2 supported atomically ordered bimetallic Au-Cu alloys. J Catal 2017. [DOI: 10.1016/j.jcat.2017.06.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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26
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Belhadj H, Hamid S, Robertson PKJ, Bahnemann DW. Mechanisms of Simultaneous Hydrogen Production and Formaldehyde Oxidation in H2O and D2O over Platinized TiO2. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01312] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hamza Belhadj
- Institut
für Technische Chemie, Leibniz Universität Hannover, Callinstraße 3, D-30167 Hannover, Germany
| | - Saher Hamid
- Institut
für Technische Chemie, Leibniz Universität Hannover, Callinstraße 3, D-30167 Hannover, Germany
| | - Peter K. J. Robertson
- Centre
for Energy Sustainability, School of Chemistry and Chemical Engineering, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, U.K
| | - Detlef W. Bahnemann
- Institut
für Technische Chemie, Leibniz Universität Hannover, Callinstraße 3, D-30167 Hannover, Germany
- Laboratory
‘‘Photoactive Nanocomposite Materials’’, Saint-Petersburg State University, Ulyanovskaya str. 1, Peterhof, Saint-Petersburg 198504, Russia
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27
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Pt-Au/MO x-CeO₂ (M = Mn, Fe, Ti) Catalysts for the Co-Oxidation of CO and H₂ at Room Temperature. Molecules 2017; 22:molecules22030351. [PMID: 28264456 PMCID: PMC6155335 DOI: 10.3390/molecules22030351] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 02/17/2017] [Accepted: 02/21/2017] [Indexed: 11/17/2022] Open
Abstract
A series of nanostructured Pt-Au/MOx-CeO2 (M = Mn, Fe, Ti) catalysts were prepared and their catalytic performance for the co-oxidation of carbon monoxide (CO) and hydrogen (H2) were evaluated at room temperature. The results showed that MOx promoted the CO oxidation of Pt-Au/CeO2, but only the TiO2 could enhance co-oxidation of CO and H2 over Pt-Au/CeO2. Related characterizations were conducted to clarify the promoting effect of MOx. Temperature-programmed reduction of hydrogen (H2-TPR) and X-ray photoelectron spectroscopy (XPS) results suggested that MOx could improve the charge transfer from Au sites to CeO2, resulting in a high concentration of Ce3+ and cationic Au species which benefits for the CO oxidation. In-situ diffuse reflectance infrared Fourier transform spectroscopy (In-situ DRIFTS) results indicated that TiO2 could facilitate the oxidation of H2 over the Pt-Au/TiO2-CeO2 catalyst.
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28
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La-doped Pt/TiO2 as an efficient catalyst for room temperature oxidation of low concentration HCHO. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(16)62532-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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29
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Mino L. IR spectroscopy as a tool to investigate photocatalytic reactions at oxide surfaces. RENDICONTI LINCEI-SCIENZE FISICHE E NATURALI 2016. [DOI: 10.1007/s12210-016-0592-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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30
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Tan TH, Scott J, Ng YH, Taylor RA, Aguey-Zinsou KF, Amal R. C–C Cleavage by Au/TiO2 during Ethanol Oxidation: Understanding Bandgap Photoexcitation and Plasmonically Mediated Charge Transfer via Quantitative in Situ DRIFTS. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01833] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tze Hao Tan
- School of Chemical
Engineering, The University of New South Wales (UNSW), Kensington, New South Wales 2052, Australia
| | - Jason Scott
- School of Chemical
Engineering, The University of New South Wales (UNSW), Kensington, New South Wales 2052, Australia
| | - Yun Hau Ng
- School of Chemical
Engineering, The University of New South Wales (UNSW), Kensington, New South Wales 2052, Australia
| | - Robert A. Taylor
- School of Mechanical and Manufacturing
Engineering, The University of New South Wales (UNSW), Kensington, New South Wales 2052, Australia
| | - Kondo-Francois Aguey-Zinsou
- School of Chemical
Engineering, The University of New South Wales (UNSW), Kensington, New South Wales 2052, Australia
| | - Rose Amal
- School of Chemical
Engineering, The University of New South Wales (UNSW), Kensington, New South Wales 2052, Australia
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31
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Chen B, Zhu X, Wang Y, Yu L, Shi C. Gold stabilized on various oxide supports catalyzing formaldehyde oxidation at room temperature. CHINESE JOURNAL OF CATALYSIS 2016. [DOI: 10.1016/s1872-2067(16)62470-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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32
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Photocatalytic oxidation of methane over silver decorated zinc oxide nanocatalysts. Nat Commun 2016; 7:12273. [PMID: 27435112 PMCID: PMC4961799 DOI: 10.1038/ncomms12273] [Citation(s) in RCA: 140] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/17/2016] [Indexed: 12/24/2022] Open
Abstract
The search for active catalysts that efficiently oxidize methane under ambient conditions remains a challenging task for both C1 utilization and atmospheric cleansing. Here, we show that when the particle size of zinc oxide is reduced down to the nanoscale, it exhibits high activity for methane oxidation under simulated sunlight illumination, and nano silver decoration further enhances the photo-activity via the surface plasmon resonance. The high quantum yield of 8% at wavelengths <400 nm and over 0.1% at wavelengths ∼470 nm achieved on the silver decorated zinc oxide nanostructures shows great promise for atmospheric methane oxidation. Moreover, the nano-particulate composites can efficiently photo-oxidize other small molecular hydrocarbons such as ethane, propane and ethylene, and in particular, can dehydrogenize methane to generate ethane, ethylene and so on. On the basis of the experimental results, a two-step photocatalytic reaction process is suggested to account for the methane photo-oxidation. The search for active catalysts that oxidize methane under ambient conditions is a challenging task. Here, the authors report a nanoscale zinc oxide catalyst that efficiently oxidizes methane under simulated sunlight, with surface plasmon enhanced photo-activity owing to integrated silver nanoparticles.
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33
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Abstract
Superoxide ion (O2(•-)) is of great significance as a radical species implicated in diverse chemical and biological systems. However, the chemistry knowledge of O2(•-) is rather scarce. In addition, numerous studies on O2(•-) were conducted within the latter half of the 20th century. Therefore, the current advancement in technology and instrumentation will certainly provide better insights into mechanisms and products of O2(•-) reactions and thus will result in new findings. This review emphasizes the state-of-the-art research on O2(•-) so as to enable researchers to venture into future research. It comprises the main characteristics of O2(•-) followed by generation methods. The reaction types of O2(•-) are reviewed, and its potential applications including the destruction of hazardous chemicals, synthesis of organic compounds, and many other applications are highlighted. The O2(•-) environmental chemistry is also discussed. The detection methods of O2(•-) are categorized and elaborated. Special attention is given to the feasibility of using ionic liquids as media for O2(•-), addressing the latest progress of generation and applications. The effect of electrodes on the O2(•-) electrochemical generation is reviewed. Finally, some remarks and future perspectives are concluded.
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Affiliation(s)
| | | | - Inas M AlNashef
- Department of Chemical and Environmental Engineering, Masdar Institute of Science and Technology , Abu Dhabi, United Arab Emirates
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34
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Gu D, Wang B, Zhu Y, Wu H. Photocatalytic Degradation of Gaseous Formaldehyde by Modified Hierarchical TiO2 Nanotubes at Room Temperature. Aust J Chem 2016. [DOI: 10.1071/ch15484] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
As a major indoor air pollutant, formaldehyde released from building and furnishing materials is one of the main volatile organic compounds (VOCs). Hierarchical TiO2 nanotube arrays (TiO2 NTs) prepared via a facile two-step anodization showed excellent photocatalytic (PC) degradation of formaldehyde at room temperature. Modification with noble metal nanoparticles (NMNs) could further improve the PC activity of TiO2 NTs. The final products of formaldehyde degradation were detected to be CO2 and H2O, which indicated that the mineralization of formaldehyde was the major process in this PC reaction. The reaction rate constants (k) determined for the three catalysts were in the order kTiO2 NTs < kAu/TiO2 NTs < kPt/TiO2 NTs (Pt/TiO2 NTs had the highest PC ability). The significant enhancement of PC performance can be ascribed to the formation of a Schottky junction between the NMNs and TiO2 NTs.
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35
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Liu J, McCarthy D, Tong L, Cowan MJ, Kinsley JM, Sonnenberg L, Skorenko KH, Boyer SM, DeCoste JB, Bernier WE, Jones WE. Poly(3,4-ethylenedioxythiophene) (PEDOT) infused TiO2 nanofibers: the role of hole transport layer in photocatalytic degradation of phenazopyridine as a pharmaceutical contaminant. RSC Adv 2016. [DOI: 10.1039/c6ra22797j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PEDOT infused TiO2 nanofibers exhibit enhanced photocatalytic performance by improved hole transfer for the degradation of PAP.
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Affiliation(s)
- Jian Liu
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
| | - Danielle L. McCarthy
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
| | - Linyue Tong
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
| | - Michael J. Cowan
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
| | - John M. Kinsley
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
| | - Laura Sonnenberg
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
| | - Kenneth H. Skorenko
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
| | - Steven M. Boyer
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
| | | | - William E. Bernier
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
| | - Wayne E. Jones
- Department of Chemistry
- Binghamton University-State University of New York
- Binghamton
- USA
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36
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Silver/ion exchanger nanocomposites as low-temperature redox-catalysts for methanal oxidation. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.03.227] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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37
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Wang M, Zhang F, Zhu X, Qi Z, Hong B, Ding J, Bao J, Sun S, Gao C. DRIFTS evidence for facet-dependent adsorption of gaseous toluene on TiO2 with relative photocatalytic properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1730-1736. [PMID: 25602129 DOI: 10.1021/la5047595] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Effective adsorption is of great importance to the photocatalytic degradation of volatile organic compounds. Herein, we succeeded in the preparation of anatase TiO2 with clean dominant {001} and {101} facets. By using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) equipped with a homemade reaction system and a coupling gas-dosing system, we found that TiO2 with dominant {001} facets exhibits higher toluene adsorption capacity than TiO2 with dominant {101} facets, which may be attributed to the different number of unsaturated 5c-Ti capable of forming the main active adsorption sites (terminal Ti-OH species). TiO2 with dominant {001} facets shows a significantly high photocatalytic degradation performance, with its degradation rate being 6 times higher than that of dominant {101} facets. Combined with simulation results, it is suggested that the synergetic effects of the formation of specific active adsorption sites, the low adsorption energy for toluene, and preservation of the free molecularly adsorbed water on the surface promote the degradation of gaseous toluene on the dominant {001} facets. This study exemplifies that the facet-dependent adsorption of volatile organic compounds is one of the most important factors to effectively engineer photocatalysts for air purification.
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Affiliation(s)
- Mengjiao Wang
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science & Technology of China , Hefei, Anhui 230026, China
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38
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Li G, Li L. Highly efficient formaldehyde elimination over meso-structured M/CeO2 (M = Pd, Pt, Au and Ag) catalyst under ambient conditions. RSC Adv 2015. [DOI: 10.1039/c5ra04928h] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of mesoporous CeO2 supported noble metal (Pt, Pd, Au and Ag) catalysts, fabricated through a facial pyrolysis and in situ reduction protocol, were used for formaldehyde elimination under ambient conditions.
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Affiliation(s)
- Gengnan Li
- Key Laboratory for Ultrafine Materials of Ministry of Education
- School of Materials Science and Engineering
- East China University of Science and Technology
- Shanghai
- China
| | - Liang Li
- Key Laboratory for Ultrafine Materials of Ministry of Education
- School of Materials Science and Engineering
- East China University of Science and Technology
- Shanghai
- China
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39
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Mechanism Study of Photocatalytic Degradation of Gaseous Toluene on TiO2 with Weak-Bond Adsorption Analysis Using In Situ Far Infrared Spectroscopy. Catal Letters 2014. [DOI: 10.1007/s10562-014-1213-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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40
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El-Roz M, Bazin P, Daturi M, Thibault-Starzyk F. Operando Infrared (IR) Coupled to Steady-State Isotopic Transient Kinetic Analysis (SSITKA) for Photocatalysis: Reactivity and Mechanistic Studies. ACS Catal 2013. [DOI: 10.1021/cs4006088] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mohamad El-Roz
- Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen, CNRS, 6, boulevard du Maréchal juin, 14050 Caen, France
| | - Philippe Bazin
- Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen, CNRS, 6, boulevard du Maréchal juin, 14050 Caen, France
| | - Marco Daturi
- Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen, CNRS, 6, boulevard du Maréchal juin, 14050 Caen, France
| | - Frederic Thibault-Starzyk
- Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen, CNRS, 6, boulevard du Maréchal juin, 14050 Caen, France
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41
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Huang K, Kong L, Yuan F, Xie C. In situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) study of formaldehyde adsorption and reactions on Pd-doped nano-γ-Fe₂O₃ films. APPLIED SPECTROSCOPY 2013; 67:930-939. [PMID: 23876732 DOI: 10.1366/12-06761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Palladium-doped nano-γ-Fe₂O₃ films were printed on Al₂O₃ substrates by screen printing-injecting hybrid technology. X-ray diffraction and scanning electron microscopy techniques were used to characterize the phase structures and morphologies of the films, respectively. The sensitivity of the films to 100 ppm formaldehyde in air was investigated. The surface adsorption and reaction process between Pd-doped nano-γ-Fe₂O₃ films and formaldehyde was studied by in situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) at different temperatures. Dioxymethylene, formate ions, polyoxymethylene, and adsorbed formaldehyde were detected when the Pd-doped nano-γ-Fe₂O₃ films were exposed to 100 ppm formaldehyde at different temperatures. A possible mechanism of the reaction process is discussed.
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Affiliation(s)
- Kaijin Huang
- State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
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42
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M. R. Muir J, Idriss H. Formaldehyde adsorption geometry and energies over TiO2(110) rutile surface. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.03.070] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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43
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Chowdhury P, Malekshoar G, Ray MB, Zhu J, Ray AK. Sacrificial Hydrogen Generation from Formaldehyde with Pt/TiO2 Photocatalyst in Solar Radiation. Ind Eng Chem Res 2013. [DOI: 10.1021/ie3029976] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pankaj Chowdhury
- Department
of Chemical and Biochemical Engineering, University of Western Ontario, London, Ontario N6A
5B9, Canada
| | - Ghodsieh Malekshoar
- Department
of Chemical and Biochemical Engineering, University of Western Ontario, London, Ontario N6A
5B9, Canada
| | - Madhumita B. Ray
- Department
of Chemical and Biochemical Engineering, University of Western Ontario, London, Ontario N6A
5B9, Canada
| | - Jesse Zhu
- Department
of Chemical and Biochemical Engineering, University of Western Ontario, London, Ontario N6A
5B9, Canada
| | - Ajay K. Ray
- Department
of Chemical and Biochemical Engineering, University of Western Ontario, London, Ontario N6A
5B9, Canada
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44
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Quiroz Torres J, Royer S, Bellat JP, Giraudon JM, Lamonier JF. Formaldehyde: catalytic oxidation as a promising soft way of elimination. CHEMSUSCHEM 2013; 6:578-592. [PMID: 23456881 DOI: 10.1002/cssc.201200809] [Citation(s) in RCA: 118] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Indexed: 06/01/2023]
Abstract
Compared to other molecules such as benzene, toluene, xylene, and chlorinated compounds, the catalytic oxidation of formaldehyde has been studied rarely. However, standards for the emission level of this pollutant will become more restrictive because of its extreme toxicity even at very low concentrations in air. As a consequence, the development of a highly efficient process for its selective elimination is needed. Complete catalytic oxidation of formaldehyde into CO2 and H2 O using noble-metal-based catalysts is a promising method to convert this pollutant at room temperature, making this process energetically attractive from an industrial point of view. However, the development of a less expensive active phase is required for a large-scale industrial development. Nanomaterials based on oxides of manganese are described as the most promising catalysts. The objective of this Minireview is to present promising recent studies on the removal of formaldehyde through heterogeneous catalysis to stimulate future research in this topic.
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Affiliation(s)
- Jhon Quiroz Torres
- Université de Lille1, Unité de Catalyse et Chimie du Solide, UMR CNRS 8181, 59652 Villeneuve d'Ascq, France
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45
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Hauchecorne B, Lenaerts S. Unravelling the mysteries of gas phase photocatalytic reaction pathways by studying the catalyst surface: A literature review of different Fourier transform infrared spectroscopic reaction cells used in the field. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2013. [DOI: 10.1016/j.jphotochemrev.2012.09.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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46
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Chen H, Nanayakkara CE, Grassian VH. Titanium Dioxide Photocatalysis in Atmospheric Chemistry. Chem Rev 2012; 112:5919-48. [DOI: 10.1021/cr3002092] [Citation(s) in RCA: 614] [Impact Index Per Article: 51.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haihan Chen
- Departments
of Chemical and Biochemical Engineering and §Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Charith E. Nanayakkara
- Departments
of Chemical and Biochemical Engineering and §Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Vicki H. Grassian
- Departments
of Chemical and Biochemical Engineering and §Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
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47
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Huang Q, Zeng D, Li H, Xie C. Room temperature formaldehyde sensors with enhanced performance, fast response and recovery based on zinc oxide quantum dots/graphene nanocomposites. NANOSCALE 2012; 4:5651-8. [PMID: 22868941 DOI: 10.1039/c2nr31131c] [Citation(s) in RCA: 102] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Novel zinc oxide quantum dots (ZnO QDs) decorated graphene nanocomposites were fabricated by a facile solution-processed method. ZnO QDs with a size ca. 5 nm are nucleated and grown on the surface of the graphene template, and its distribution density can be easily controlled by the reaction time and precursor concentration. The ZnO QDs/graphene nanocomposite materials enhance formaldehyde sensing properties by 4 times compared to pure graphene at room temperature. Moreover, the sensors based on the nanocomposites have fast response (ca. 30 seconds) and recovery (ca. 40 seconds) behavior, excellent room temperature selectivity and stability. The gas sensing enhancement is attributed to the synergistic effect of graphene and ZnO QDs. The electron transfer between the ZnO QDs and the graphene is due to oxidation process of the analyzed gas on the ZnO QDs' surface. This proposed gas sensing mechanism is experimentally proved by DRIFT spectra results. The ZnO QDs/graphene nanocomposites sensors have potential applications for monitoring air pollution, especially for harmful and toxic VOCs (volatile organic compounds).
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Affiliation(s)
- Qingwu Huang
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, No. 1037, Luoyu Road, Wuhan 430074, PR China.
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