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Zhang H, Cao Y, Wang S, Tang Y, Tian L, Cai W, Wei Z, Wu Z, Zhu Y, Guo Q. Photocatalytic removal of ammonia nitrogen from water: investigations and challenges for enhanced activity. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:41824-41843. [PMID: 38862798 DOI: 10.1007/s11356-024-33891-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: 10/24/2023] [Accepted: 05/30/2024] [Indexed: 06/13/2024]
Abstract
Ammonia nitrogen (NH3-N/NH4+-N) serves as a crucial chemical in biochemistry and fertilizer synthesis. However, it is also a toxic compound, posing risks from eutrophication to direct threats to human health. Ammonia nitrogen pollution pervades water sources, presenting a significant challenge. While several water treatment technologies exist, biological treatment, though widely used, has its limitations. Hence, green and efficient photocatalytic technology emerges as a promising solution. However, current monolithic semiconductor photocatalysts prove inadequate in controlling ammonia nitrogen pollution. Therefore, this review focuses on enhancing semiconductor photocatalysts' efficiency through modification, discussing four mechanisms: (1) mono-ionic modification; (2) metallic and non-metallic modification; (3) construct heterojunctions; and (4) enhancement of synergistic effects of multiple technologies. The influencing factors of photocatalytic ammonia nitrogen removal efficiency are also explored. Moreover, the review outlines the limitations of current photocatalytic pollution treatment and discusses future development trends and research challenges. Currently, the main products of ammonia nitrogen removal include NO3-, NO2-, and N2. To mitigate secondary pollution, the green process of converting ammonia nitrogen to N2 using photocatalysis emerges as a fundamental approach for future treatment. Overall, this review aims to deepen understanding of photocatalysis in ammonia nitrogen treatment and guide researchers toward widespread implementation of this endeavor.
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Affiliation(s)
- Huining Zhang
- School of Civil Engineering, Lanzhou University of Technology, Langongping Road 287, Qilihe District, Lanzhou, 730050, China.
- Institute of Nanomaterials Application Technology, Gansu Academy of Sciences, Lanzhou, 730030, China.
| | - Yang Cao
- School of Civil Engineering, Lanzhou University of Technology, Langongping Road 287, Qilihe District, Lanzhou, 730050, China
| | - Shaofeng Wang
- School of Civil Engineering, Lanzhou University of Technology, Langongping Road 287, Qilihe District, Lanzhou, 730050, China
| | - Yuling Tang
- School of Civil Engineering, Lanzhou University of Technology, Langongping Road 287, Qilihe District, Lanzhou, 730050, China
| | - Lihong Tian
- School of Civil Engineering, Lanzhou University of Technology, Langongping Road 287, Qilihe District, Lanzhou, 730050, China
| | - Wenrui Cai
- School of Civil Engineering, Lanzhou University of Technology, Langongping Road 287, Qilihe District, Lanzhou, 730050, China
| | - Zhiqiang Wei
- School of Civil Engineering, Lanzhou University of Technology, Langongping Road 287, Qilihe District, Lanzhou, 730050, China
| | - Zhiguo Wu
- Institute of Nanomaterials Application Technology, Gansu Academy of Sciences, Lanzhou, 730030, China
| | - Ying Zhu
- Institute of Biology, Gansu Academy of Sciences, Lanzhou, 730030, China
| | - Qi Guo
- Institute of Biology, Gansu Academy of Sciences, Lanzhou, 730030, China
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Le PH, Vy TTT, Thanh VV, Hieu DH, Tran QT, Nguyen NVT, Uyen NN, Tram NTT, Toan NC, Xuan LT, Tuyen LTC, Kien NT, Hu YM, Jian SR. Facile Preparation Method of TiO 2/Activated Carbon for Photocatalytic Degradation of Methylene Blue. MICROMACHINES 2024; 15:714. [PMID: 38930684 PMCID: PMC11205648 DOI: 10.3390/mi15060714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 05/20/2024] [Accepted: 05/27/2024] [Indexed: 06/28/2024]
Abstract
The development of nanocomposite photocatalysts with high photocatalytic activity, cost-effectiveness, a simple preparation process, and scalability for practical applications is of great interest. In this study, nanocomposites of TiO2 Degussa P25 nanoparticles/activated carbon (TiO2/AC) were prepared at various mass ratios of (4:1), (3:2), (2:3), and (1:4) by a facile process involving manual mechanical pounding, ultrasonic-assisted mixing in an ethanol solution, paper filtration, and mild thermal annealing. The characterization methods included XRD, SEM-EDS, Raman, FTIR, XPS, and UV-Vis spectroscopies. The effects of TiO2/AC mass ratios on the structural, morphological, and photocatalytic properties were systematically studied in comparison with bare TiO2 and bare AC. TiO2 nanoparticles exhibited dominant anatase and minor rutile phases and a crystallite size of approximately 21 nm, while AC had XRD peaks of graphite and carbon and a crystallite size of 49 nm. The composites exhibited tight decoration of TiO2 nanoparticles on micron-/submicron AC particles, and uniform TiO2/AC composites were obtained, as evidenced by the uniform distribution of Ti, O, and C in an EDS mapping. Moreover, Raman spectra show the typical vibration modes of anatase TiO2 (e.g., E1g(1), B1g(1), Eg(3)) and carbon materials with D and G bands. The TiO2/AC with (4:1), (3:2), and (2:3) possessed higher reaction rate constants (k) in photocatalytic degradation of methylene blue (MB) than that of either TiO2 or AC. Among the investigated materials, TiO2/AC = 4:1 achieved the highest photocatalytic activity with a high k of 55.2 × 10-3 min-1 and an MB removal efficiency of 96.6% after 30 min of treatment under UV-Vis irradiation (120 mW/cm2). The enhanced photocatalytic activity for TiO2/AC is due to the synergistic effect of the high adsorption capability of AC and the high photocatalytic activity of TiO2. Furthermore, TiO2/AC promotes the separation of photoexcited electron/hole (e-/h+) pairs to reduce their recombination rate and thus enhance photocatalytic activity. The optimal TiO2/AC composite with a mass ratio of 4/1 is suggested for treating industrial or household wastewater with organic pollutants.
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Affiliation(s)
- Phuoc Huu Le
- Center for Plasma and Thin Film Technologies, Ming Chi University of Technology, New Taipei City 24301, Taiwan
- International Ph.D. Program in Plasma and Thin Film Technology, Ming Chi University of Technology, New Taipei City 24301, Taiwan
- Faculty of Basic Sciences, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 900000, Vietnam; (N.N.U.); (N.T.T.T.)
| | - Tran Thi Thuy Vy
- Faculty of Pharmacy, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 900000, Vietnam; (T.T.T.V.); (V.V.T.); (D.H.H.); (Q.-T.T.); (N.-V.T.N.)
| | - Vo Van Thanh
- Faculty of Pharmacy, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 900000, Vietnam; (T.T.T.V.); (V.V.T.); (D.H.H.); (Q.-T.T.); (N.-V.T.N.)
| | - Duong Hoang Hieu
- Faculty of Pharmacy, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 900000, Vietnam; (T.T.T.V.); (V.V.T.); (D.H.H.); (Q.-T.T.); (N.-V.T.N.)
| | - Quang-Thinh Tran
- Faculty of Pharmacy, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 900000, Vietnam; (T.T.T.V.); (V.V.T.); (D.H.H.); (Q.-T.T.); (N.-V.T.N.)
| | - Ngoc-Van Thi Nguyen
- Faculty of Pharmacy, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 900000, Vietnam; (T.T.T.V.); (V.V.T.); (D.H.H.); (Q.-T.T.); (N.-V.T.N.)
| | - Ngo Ngoc Uyen
- Faculty of Basic Sciences, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 900000, Vietnam; (N.N.U.); (N.T.T.T.)
| | - Nguyen Thi Thu Tram
- Faculty of Basic Sciences, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 900000, Vietnam; (N.N.U.); (N.T.T.T.)
| | - Nguyen Chi Toan
- Faculty of Pharmacy and Nursing, Tay Do University, 68 Tran Chien Street, Can Tho City 900000, Vietnam;
| | - Ly Tho Xuan
- Department of Materials Science and Engineering, National Taiwan University Science and Technology, Taipei City 106335, Taiwan;
| | - Le Thi Cam Tuyen
- Faculty of Chemical Engineering, Can Tho University, 3/2 Street, Ninh Kieu District, Can Tho City 900000, Vietnam;
| | - Nguyen Trung Kien
- Faculty of Medicine, Can Tho University of Medicine and Pharmacy, 179 Nguyen Van Cu Street, Can Tho City 900000, Vietnam;
| | - Yu-Min Hu
- Department of Applied Physics, National University of Kaohsiung, Kaohsiung 81148, Taiwan;
| | - Sheng-Rui Jian
- Department of Materials Science and Engineering, I-Shou University, Kaohsiung 84001, Taiwan
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Zhu L, Chen Y, Liu X, Si Y, Tang Y, Wang X. MoS 2-modified MIL-53(Fe) for synergistic adsorption-photocatalytic degradation of tetracycline. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:23086-23095. [PMID: 36316553 DOI: 10.1007/s11356-022-23859-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
In this paper, MoS2@MIL-53(Fe) (noted as MSMF) metal-organic backbone adsorption photocatalysts were successfully prepared by a solvothermal method. For the degradation performance of MSMF catalysts on tetracycline pollutants, the effects of MoS2 doping ratio, reaction mode, and contaminant concentration on the degradation performance were investigated. And the materials were characterized by XRD, XPS, SEM, BET, PL, and ESR to investigate the reaction mechanism. The results showed that the optimal synthesis mass ratio of MoS2:MIL-53 (Fe) prepared by holding at 150 °C for 10 h was 0.20:1 (20%MSMF). In the adsorption-photocatalytic synergy experiment, 87.62% of tetracycline (30 mg/L) could be removed with 0.20 g/L of 20%MSMF after 40 min of UV irradiation, while the removal of tetracycline by MoS2 and MIL-53 (Fe) was only 35.99% and 65.40%. The characterization showed that the specific surface area and total pore volume of 20%MSMF were 1.12 and 3.12 times higher than those of MIL-53 (Fe), respectively. And the separation and transfer efficiency of electron-hole pairs were improved for 20%MSMF compared to the constituent components. These results suggest that the doping of MoS2 enhances the adsorption and photocatalytic ability of MIL-53 (Fe) that can be used for the efficient treatment of tetracycline.
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Affiliation(s)
- Lei Zhu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, People's Republic of China
| | - Yu Chen
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, People's Republic of China
| | - Xian Liu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, People's Republic of China
| | - Yanyao Si
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, People's Republic of China
| | - Yuxin Tang
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, People's Republic of China
| | - Xun Wang
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, People's Republic of China.
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Vuggili SB, Kadiya K, Gaur UK, Sharma M. Synthesis of graphitic carbon nitride/cadmium sulfide core-shell nanofibers for enhanced photocatalysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:46377-46389. [PMID: 32979178 DOI: 10.1007/s11356-020-10568-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 08/18/2020] [Indexed: 06/11/2023]
Abstract
The synthesis of graphitic carbon nitride/cadmium sulfide core-shell nanofibers has been studied for the improved photodegradation of methylene blue (MB) dye. The enhancement in photocatalytic activity in g-C3N4@CdS core-shell nanostructures has been increased by controlling the thickness of the CdS shell. Additionally, the favorable bandgap, suitable band positions, and high thermal stability played an important role to enhance the photodegradation rate of catalysts. g-C3N4@CdS core-shell nanofiber arrays were synthesized by using a simple two-step process. g-C3N4 nanofiber (gcnf) was synthesized by using a simple polycondensation method and followed by a surface modification step for the deposition of CdS nanoparticles. The characterization of core-shell nanofibers and their photocatalytic activity was examined by powder X-ray diffraction, UV-Vis spectrophotometer, FESEM, EDS, and TEM microscopy. g-C3N4@CdS core-shell nanofibers (gcnf/CdS, 0.38; gcnf/CdS, 0.19; and gcnf/CdS, 0.09) showed enhanced photocatalytic degradation efficiency of ~ 98% in 40, 50, and 70 min, respectively. Pristine g-C3N4 nanofibers and CdS nanoparticles displayed the photodegradation efficiency of ~ 98% in 100 and 170 min, respectively. gcnf/CdS, 0.38 core-shell nanofibers (0.38 M of citric acid), offered the highest photodegradation rate of 0.0624 min-1, which is ~ 2.5- and 3-fold higher than pristine g-C3N4 nanofibers and CdS nanoparticles, respectively. The increase in the photodegradation rate of the g-C3N4@CdS core-shell nanostructure is due to the synergetic effect of g-C3N4 and CdS. Thus, the present work highlights the enhanced photocatalytic activity and stability of g-C3N4@CdS core-shell nanofibers and found to be useful in energy harvesting and environmental remediation applications.
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Affiliation(s)
- Sai Bhargava Vuggili
- School of Nano Sciences, Central University of Gujarat, Gandhinagar, 382030, India
| | - Kaushal Kadiya
- School of Nano Sciences, Central University of Gujarat, Gandhinagar, 382030, India
| | - Umesh Kumar Gaur
- Department of Physics, Dr. BR Ambedkar National Institute of Technology, Jalandhar, Punjab, 144011, India.
| | - Manu Sharma
- School of Nano Sciences, Central University of Gujarat, Gandhinagar, 382030, India.
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Yang CX, Zhu Q, Dong WP, Fan YQ, Wang WL. Preparation and Characterization of Phosphoric Acid-Modified Biochar Nanomaterials with Highly Efficient Adsorption and Photodegradation Ability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9253-9263. [PMID: 34286996 DOI: 10.1021/acs.langmuir.1c01468] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Phosphoric acid-modified biochar (PMBC) was prepared using biochar (BC) as the carbon source and phosphoric acid as the activating agent. The PMBC exhibited an ordered vessel structure after deashing treatment, but the sidewalls became much rougher, the polarity (O/C atomic ratio of BC = 0.2320 and O/C atomic ratio of PMBC = 0.1604) decreased, and the isoelectric points (PI of BC = 5.22 and PI of PMBC = 5.51) and specific surface area (SSA of BC = 55.322 m2/g and SSA of PMBC = 62.285 m2/g) increased. The adsorption characterization of the removal of sulfadiazine (SDZ) from PMBC was studied. The adsorption of SDZ by PMBC was in accordance with the Langmuir isotherm model and the pseudo-second-order kinetics model, and the adsorption thermodynamics were shown as Gibbs free energy < 0, an enthalpy change of 19.157 kJ/mol, and an entropy change of 0.0718 kJ/(K·mol). The adsorption of SDZ by PMBC was a complicated monolayer adsorption that was spontaneous, irreversible, and endothermic, and physical adsorption and chemical adsorption occurred simultaneously. The adsorption process was controlled by microporous capture, electrostatic interactions, hydrogen-bond interactions, and π-π interactions. PMBC@TiO2 photocatalysts with different mass ratios between TiO2 and PMBC were prepared via the in situ sol-gel method. PMBC@TiO2 exhibited both an ordered vessel structure (PMBC) and irregular particles (TiO2), and it was linked via Ti-O-C bonds. The optimal mass ratio between TiO2 and PMBC was 3:1. The removal of SDZ via PMBC@TiO2 was dependent on the coupling of adsorption and photocatalysis. The PMBC-enhanced photocatalytic performance of PMBC@TiO2 resulted in a higher absorption of UV and visible light, greater generation of reactive oxygen species, high levels of adsorption of SDZ on PMBC, and the conjugated structure and oxygen-containing functional groups that promoted the separation efficiency of the hole-electron pairs.
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Affiliation(s)
- Chuan Xi Yang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
| | - Qing Zhu
- Shandong Research Center of Statistical Analysis of Science and Technology, Jinan 250101, China
| | - Wen Ping Dong
- Shandong Academy of Environmental Science Co., Ltd., Jinan 250013, China
- Shandong Huankeyuan Environmental Engineering Co., Ltd., Jinan 250013, China
| | - Yu Qi Fan
- Institute of Environment and Ecology, Shandong Normal University, Jinan 250358, China
| | - Wei Liang Wang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
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El Mragui A, Zegaoui O, Daou I, Esteves da Silva JCG. Preparation, characterization, and photocatalytic activity under UV and visible light of Co, Mn, and Ni mono-doped and (P,Mo) and (P,W) co-doped TiO 2 nanoparticles: a comparative study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:25130-25145. [PMID: 30915692 DOI: 10.1007/s11356-019-04754-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 03/04/2019] [Indexed: 05/22/2023]
Abstract
In this work, TiO2-based nanomaterials have been successfully synthesized by doping TiO2 with Co, Mn, and Ni and by co-doping it with (P,Mo) or (P,W). The structural, optical, and morphological properties of the synthesized nanomaterials have been investigated using various techniques such as XRD, FTIR spectroscopy, UV-vis diffuse reflectance spectroscopy, XPS, and SEM-EDS. The obtained results showed that the crystalline structure of the doped TiO2-based nanomaterials depends strongly on the nature of the doping ions. The obtained band gap energy of TiO2 co-doped with (P,Mo) changes to a level below the band gap energy of TiO2 anatase indicating a high ability to absorb visible light. The obtained photocatalytic activity results of methyl orange degradation showed that, under visible light, the mono-doping of TiO2 with Co and its co-doping with (P,Mo) or (P,W) improve significantly the photocatalytic activity of TiO2 in comparison with undoped TiO2. The activity order obtained under UV-A irradiation for the used photocatalysts is TiO2 > > 1%Ni-TiO2 > 1%Co-TiO2 > 30%(P,Mo)-TiO2 ≈ 30%(P,W)TiO2 > 1%Mn-TiO2 while under visible light, it is 1%Co-TiO2 > 30%(P,Mo)-TiO2 > 30%(P,W)TiO2 ≈ TiO2 > 1%Ni-TiO2 > 1%Mn-TiO2. The high photocatalytic activity observed for these samples could be the result of a synergetic effect of the high visible light absorption capacity and the low recombination rate of photoexcited electrons and holes.
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Affiliation(s)
- Abderrahim El Mragui
- Research team "Materials and Applied Catalysis: MCA", "CBAE" Laboratory, Moulay Ismail University, Faculty of Sciences, BP. 11201 Zitoune, Meknès, Morocco
- CIQ(UP) - Research Center in Chemistry, DGAOT, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007, Porto, Portugal
| | - Omar Zegaoui
- Research team "Materials and Applied Catalysis: MCA", "CBAE" Laboratory, Moulay Ismail University, Faculty of Sciences, BP. 11201 Zitoune, Meknès, Morocco.
| | - Ikram Daou
- Research team "Materials and Applied Catalysis: MCA", "CBAE" Laboratory, Moulay Ismail University, Faculty of Sciences, BP. 11201 Zitoune, Meknès, Morocco
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Xu W, Jin Y, Ren Y, Li J, Wei Z, Ban C, Cai H, Chen M. Synergy mechanism for
TiO
2
/activated carbon composite material: Photocatalytic degradation of methylene blue solution. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.24097] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wenqi Xu
- School of Chemical Engineering Sichuan University Chengdu China
- Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource Ministry of Education Chengdu China
| | - Yang Jin
- School of Chemical Engineering Sichuan University Chengdu China
- Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource Ministry of Education Chengdu China
| | - Yongsheng Ren
- State Key Laboratory of High‐efficiency Utilization of Coal and Green Chemical Engineering Ningxia University Yinchuan China
| | - Jun Li
- School of Chemical Engineering Sichuan University Chengdu China
- Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource Ministry of Education Chengdu China
| | - Zhizhen Wei
- School of Chemical Engineering Sichuan University Chengdu China
- Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource Ministry of Education Chengdu China
| | - Changsheng Ban
- School of Chemical Engineering Sichuan University Chengdu China
- Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource Ministry of Education Chengdu China
| | - Haitao Cai
- School of Chemical Engineering Sichuan University Chengdu China
- Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource Ministry of Education Chengdu China
| | - Ming Chen
- School of Chemical Engineering Sichuan University Chengdu China
- Engineering Research Center for Comprehensive Utilization and Cleaning Process of Phosphate Resource Ministry of Education Chengdu China
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Simultaneous Adsorption and Photocatalysis Processes Based on Ternary TiO2–CuxS–Fly Ash Hetero-Structures. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10228070] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Ternary composites of TiO2–CuxS–fly ash were used in simultaneous adsorption and photocatalysis processes for the removal of organic (dye) pollutants. Composites of semiconductor (TiO2, CuxS) nanomaterials hosted within matrices of fly ash, such as film heterostructures, are promising materials for advanced wastewater treatment. The combination of adsorption and photocatalysis processes was investigated in the removal of methylene blue (MB), considered as a standard in photocatalysis. Ternary film heterostructures obtained by doctor blade technique allows overcoming the separation step of particles from treated wastewater. The comparison between the adsorption and photodegradation tests performed with TiO2–CuxS–fly ash showed that in dark conditions, the MB removal was 75% after 360 min, while in the presence of UV radiation, almost total dismissal of MB was achieved in the same treatment period. The degradation rate of MB, when H2O2 is used as an electron acceptor, could reach 90% in adsorption and 99% in simultaneous adsorption/photocatalysis processes. The adsorption isotherm was found to follow the Langmuir and Freundlich models.
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Yang Y, Zhang Y, Gou C, Wu W, Wang H, Zeng Q. Solar photocatalytic degradation of thidiazuron in Yangtze River water matrix by Ag/AgCl-AC at circumneutral condition. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:40857-40869. [PMID: 32677010 DOI: 10.1007/s11356-020-09946-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 06/29/2020] [Indexed: 06/11/2023]
Abstract
It is well-known that the degradation of pollutants in real water environment is not only challenging but also has practical value. This paper focuses on the photocatalytic degradation of thidiazuron (TDZ), a popular defoliant, using Ag/AgCl-AC (Ag@AC 2:1); AC stands for activated carbon) in a matrix of Yangtze River water under sunlight irradiation. The prepared composite catalyst exhibits excellent performance in TDZ degradation under near neutral condition, the degradation rate reaches 94% in 200 min under solar irradiation. The common inorganic anions (SO42-, Cl-, and HCO3-) and cations (Ca2+, Cu2+, and Mg2+) show inhibitory effect of different degrees on TDZ degradation. Humic substances such as humic acid and fulvic acid also have an effect on the photocatalytic degradation of TDZ. With the increase of humic acid concentration, there is enhancement of inhibitory effect. As for fulvic acid, its effect is complex due to competitive adsorption and photoinduction action. The degradation products as identified by UHPLC-MS are mainly CO2, SO2, and H2O, indicating that the degradation was thorough. The reusability test of four runs reveals that the performance of the photocatalytic system is stable. The results demonstrate that sunlight can be well utilized for the photocatalytic degradation of TDZ. The study offers a cheap and effective approach for the photocatalytic degradation of organic pollutants in circumneutral water bodies.
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Affiliation(s)
- Yisi Yang
- College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, People's Republic of China
- Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang, 438000, People's Republic of China
| | - Yan Zhang
- College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, People's Republic of China.
- Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang, 438000, People's Republic of China.
| | - Changsong Gou
- College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, People's Republic of China
| | - Wenjian Wu
- College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, People's Republic of China
| | - Hao Wang
- College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang, 438000, People's Republic of China
| | - Qingru Zeng
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, People's Republic of China.
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The bifunctional composites of AC restrain the stack of g-C3N4 with the excellent adsorption-photocatalytic performance for the removal of RhB. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123701] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Telegang Chekem C, Goetz V, Richardson Y, Plantard G, Blin J. Modelling of adsorption/photodegradation phenomena on AC-TiO2 composite catalysts for water treatment detoxification. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.12.038] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Awfa D, Ateia M, Fujii M, Johnson MS, Yoshimura C. Photodegradation of pharmaceuticals and personal care products in water treatment using carbonaceous-TiO 2 composites: A critical review of recent literature. WATER RESEARCH 2018; 142:26-45. [PMID: 29859390 DOI: 10.1016/j.watres.2018.05.036] [Citation(s) in RCA: 154] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 05/09/2018] [Accepted: 05/19/2018] [Indexed: 05/14/2023]
Abstract
The high concentrations of pharmaceuticals and personal care products (PPCP) that found in water in many locations are of concern. Among the available water treatment methods, heterogeneous photocatalysis using TiO2 is an emerging and viable technology to overcome the occurrence of PPCP in natural and waste water. The combination of carbonaceous materials (e.g., activated carbon, carbon nanotubes and graphene nanosheets) with TiO2, a recent development, gives significantly improved performance. In this article, we present a critical review of the development and fabrication of carbonaceous-TiO2 and its application to PPCP removal including its influence on water chemistry, and the relevant operational parameters. Finally, we present an analysis of current priorities in the ongoing research and development of carbonaceous-TiO2 for the photodegradation of PPCP.
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Affiliation(s)
- Dion Awfa
- Department of Civil and Environmental Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1, M1-4, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
| | - Mohamed Ateia
- Department of Civil and Environmental Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1, M1-4, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan; Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, SC 29634, United States; PSIPW Chair, Prince Sultan Institute for Environmental, Water and Desert Research, King Saud University, Saudi Arabia.
| | - Manabu Fujii
- Department of Civil and Environmental Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1, M1-4, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
| | - Matthew S Johnson
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
| | - Chihiro Yoshimura
- Department of Civil and Environmental Engineering, School of Environment and Society, Tokyo Institute of Technology, 2-12-1, M1-4, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
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Natarajan S, Bajaj HC, Tayade RJ. Recent advances based on the synergetic effect of adsorption for removal of dyes from waste water using photocatalytic process. J Environ Sci (China) 2018; 65:201-222. [PMID: 29548392 DOI: 10.1016/j.jes.2017.03.011] [Citation(s) in RCA: 262] [Impact Index Per Article: 37.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 03/08/2017] [Indexed: 05/21/2023]
Abstract
The problem of textile dye pollution has been addressed by various methods, mainly physical, chemical, biological, and acoustical. These methods mainly separate and/or remove the dye present in water. Recently, advanced oxidation processes (AOP) have been focused for removal of dye from waste water due to their advantages such as ecofriendly, economic and capable to degrade many dyes or organic pollutant present in water. Photocatalysis is one of the advance oxidation processes, mainly carried out under irradiation of light and suitable photocatalytic materials. The photocatalytic activity of the photocatalytic materials mainly depends on the band gap, surface area, and generation of electron-hole pair for degradation dyes present in water. It has been observed that the surface area plays a major role in photocatalytic degradation of dyes, by providing higher surface area, which leads to the higher adsorption of dye molecule on the surface of photocatalyst and enhances the photocatalytic activity. This present review discusses the synergic effect of adsorption of dyes on the photocatalytic efficiency of various nanostructured high surface area photocatalysts. In addition, it also provides the properties of the water polluting dyes, their mechanism and various photocatalytic materials; and their morphology used for the dye degradation under irradiation of light along with the future prospects of highly adsorptive photocatalytic material and their application in photocatalytic removal of dye from waste water.
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Affiliation(s)
- Subramanian Natarajan
- Inorganic Materials and Catalysis Division (IMCD), CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), G.B. Marg, Bhavnagar 364 002, Gujarat, India.
| | - Hari C Bajaj
- Inorganic Materials and Catalysis Division (IMCD), CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), G.B. Marg, Bhavnagar 364 002, Gujarat, India
| | - Rajesh J Tayade
- Inorganic Materials and Catalysis Division (IMCD), CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), Council of Scientific and Industrial Research (CSIR), G.B. Marg, Bhavnagar 364 002, Gujarat, India.
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