1
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Li L, Li J, Kim BH, Huang J. The effect of morphology and crystal structure on the photocatalytic and photoelectrochemical performances of WO 3. RSC Adv 2024; 14:2080-2087. [PMID: 38196906 PMCID: PMC10775019 DOI: 10.1039/d3ra07329g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 12/15/2023] [Indexed: 01/11/2024] Open
Abstract
A template-based solvothermal method was successfully developed for the controlled synthesis of two-dimensional (2D) monoclinic WO3 nanoplate/nanosheet arrays and three-dimensional (3D) hexagonal WO3 nanosphere/nanocage structures with single crystal petals. The structure-directing agents played an important role in controlling the morphology and phase of WO3 samples. The results showed that the WO3 nanospheres exhibited the highest visible light absorption capacity and a photocurrent density of 0.37 mA cm-2 at 1.23 V vs. RHE under simulated sunlight. Moreover, the photocatalytic dye results displayed 83.2% methylene blue degradation and 87.9% rhodamine B degradation within 120 min under visible light irradiation. The high performance of the WO3 nanospheres, resulted from the hierarchical structure, increased surface area and enhanced light absorption, which improved the photogenerated charge carrier transfer and separation capability.
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Affiliation(s)
- Lihua Li
- School of Materials Science and Engineering, Henan University of Science and Technology Luoyang 471023 China
| | - Jingjing Li
- School of Materials Science and Engineering, Luoyang Institute of Science and Technology Luoyang 471023 China
| | - BoK-Hee Kim
- School of Materials Science and Engineering, Henan University of Science and Technology Luoyang 471023 China
- Division of Advanced Materials Engineering, Hydrogen and Fuel Cell Research Center, Chonbuk National University Jeonju 561-756 South Korea
| | - Jinliang Huang
- School of Materials Science and Engineering, Henan University of Science and Technology Luoyang 471023 China
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2
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Liu Z, Xiang H, Zhang A, Wu L, Fu Y, Zhou Q. Enhancing Photocatalytic Antibiotics Mineralization and Water Oxidation via Constructing Interfacial Electric Field in Plate-on-Plate BiOCl/WO3 Photocatalysts. J Colloid Interface Sci 2023; 642:264-272. [PMID: 37004260 DOI: 10.1016/j.jcis.2023.03.157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 03/22/2023] [Accepted: 03/24/2023] [Indexed: 03/30/2023]
Abstract
Two-dimensional materials and related plate-on-plate interfacial heterostructures offer great flexibility for integrating different atomic layers, providing an attractive scheme for the construction of built-in electric fields in photocatalysts. Here, we developed an interfacial engineering strategy to construct well-interfaced plate-on-plate BiOCl/WO3 heterojunctions for general enhanced photocatalytic oxidation reactions. BiOCl/WO3 heterojunctions exhibited significant enhancements in oxygen evolution and antibiotic degradation, with a rate of 9.5 times and 14.7 times higher than that of WO3. This enhancement is attributed to the well lattice matching contact surface of WO3 {020} plane with BiOCl {001} plane, which integrates a strong built-in electric field induced by Bi-O chemically bonds, providing atomically fast transport channels for electrons. These findings offer new guidelines for designing interfacial structures for high-performance oxidative photocatalysts and provide insights into the underlying interfacial carrier transport mechanisms.
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3
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Falletta E, Bianchi CL, Morazzoni F, Polissi A, Di Vincenzo F, Bellobono IR. Tungsten Trioxide and Its TiO2 Mixed Composites for the Photocatalytic Degradation of NOx and Bacteria (Escherichia coli) Inactivation. Catalysts 2022; 12:822. [DOI: 10.3390/catal12080822] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The increased air pollution and its impact on the environment and human health in several countries have caused global concerns. Nitrogen oxides (NO2 and NO) are principally emitted from industrial activities that strongly contribute to poor air quality. Among bacteria emanated from the fecal droppings of livestock, wildlife, and humans, Escherichia coli is the most abundant, and is often associated with the health risk of water. TiO2/WO3 heterostructures represent emerging systems for photocatalytic environmental remediation. However, the results reported in the literature are conflicting, depending on several parameters. In this work, WO3 and a series of TiO2/WO3 composites were properly synthesized by an easy and fast method, abundantly characterized by several techniques, and used for NOx degradation and E. coli inactivation under visible light irradiation. We demonstrated that the photoactivity of TiO2/WO3 composites towards NO2 degradation under visible light is strongly related to the WO3 content. The best performance was obtained by a WO3 load of 20% that guarantees limited e−/h+ recombination. On the contrary, we showed that E. coli could not be degraded under visible irradiation of the TiO2/WO3 composites.
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4
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Rasheed T, Rizwan K, Bilal M, Sher F, Iqbal HMN. Tailored functional materials as robust candidates to mitigate pesticides in aqueous matrices-a review. Chemosphere 2021; 282:131056. [PMID: 34111632 DOI: 10.1016/j.chemosphere.2021.131056] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 05/09/2021] [Accepted: 05/28/2021] [Indexed: 02/08/2023]
Abstract
Pesticides are among the top-priority contaminants, which significantly contribute to environmental deterioration. Conventional techniques are not efficient enough to remove pollutants from environmental matrices. The development of functional materials has emerged as promising candidates to remove and degrade pesticides and related hazardous compounds. Furthermore, the nanohybrid materials with unique structural and functional characteristics, such as better material anchorage, mass transfer, electron-hole separation, and charged interaction make them a versatile option to treat and reduce pollutants from aqueous matrices. Herein, we present the current progress in the development of functional materials for the abatement of toxic pesticides. The physicochemical characteristics and pesticide-removal functionalities of various metallic functional materials (e.g., zirconium, zinc, titanium, tungsten, and iron), polymer, and carbon-based materials are critically discussed with suitable examples. Finally, the industrial-scale applications of the functional materials, concluding remarks, and future directions in this important arena are given.
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Affiliation(s)
- Tahir Rasheed
- School of Chemistry, and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Komal Rizwan
- Department of Chemistry University of Sahiwal, Sahiwal, 57000, Pakistan.
| | - Muhammad Bilal
- School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China
| | - Farooq Sher
- Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK
| | - Hafiz M N Iqbal
- Tecnologico de Monterrey, School of Engineering and Science, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L., CP 64849, Mexico
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5
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Ding H, Hu J. Degradation of carbamazepine by UVA/WO 3/hypochlorite process: Kinetic modelling, water matrix effects, and density functional theory calculations. Environ Res 2021; 201:111569. [PMID: 34186085 DOI: 10.1016/j.envres.2021.111569] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 06/15/2021] [Accepted: 06/18/2021] [Indexed: 06/13/2023]
Abstract
The rapid recombination of electron/hole pairs is a major setback in the application of WO3-based photocatalysis in water treatment. In this study, hypochlorite (ClO-) was used as an electron acceptor to enhance the photocatalytic degradation of carbamazepine (CBZ) using UVA-excited WO3. The results showed that CBZ degradation in the UVA/WO3/ClO- system followed a pseudo-first order reaction kinetic model. The addition of 0.1 mM ClO- to the UVA/WO3 system at pH values of 8.2 and 6.2 increased the rate constant (kobs) of the degradation process 5.3- and 11.5-fold, respectively. Further, increasing the WO3 dosage or decreasing the initial CBZ concentration resulted in an increase in kobs. However, at high concentrations, ClO- inhibited CBZ degradation. Based on the kinetic model, it could be suggested that ClO played a dominant role in the degradation process. Furthermore, the water matrix effects were as follows: the optimal pH was 6.2; humic acid, chloride, bicarbonate, and ammonium exhibited inhibitory effects on CBZ degradation; and sulfate ion significantly enhanced the degradation. Density functional theory (DFT) calculations indicated a strong affinity between ClO- and the WO3 surface. Specifically, the electrical energy per order that was associated with the use of ClO- varied in the range of 0.100-1.617 kWh/m3. In summary, this study shows that ClO- is an excellent electron acceptor for excited WO3, while clarifying the CBZ degradation-enhancing effect of ClO- as well as the kinetic model and DFT calculations. These findings can be employed in the degradation of recalcitrant contaminants in a cost-effective manner, while being significant for the development of more effective catalysts of UV-assisted advanced oxidation processes.
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Affiliation(s)
- Han Ding
- Department of Civil & Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore
| | - Jiangyong Hu
- Department of Civil & Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore.
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Alenazi DAK, Chandrasekaran S, Soomro MT, Aslam M, Hameed A, Ali S, Danish EY, Ismail IMI. Synthesis, characterization and photocatalytic performance of W 6+ impregnated g-C 3N 4 for the removal of chlorophenol derivatives in natural sunlight exposure. Chemosphere 2021; 265:129135. [PMID: 33302195 DOI: 10.1016/j.chemosphere.2020.129135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 11/15/2020] [Accepted: 11/25/2020] [Indexed: 06/12/2023]
Abstract
The surface of the g-C3N4 was altered by impregnating W6+ ions that transformed to homogeneously coated oxide layer by a calcination process. An enhanced absorption and the suppressed de-excitation in the emission spectra, with the increasing W6+ loading, exposed the supporting role of the coated layer in extending the spectral response as well as the prolonged life span of excitons. The same was further supported by electrochemical impedance spectroscopy (EIS). The XRD and XPS analysis revealed the coated layer as highly crystalline pure phase monoclinic WO3 with the majority of impregnated tungsten ions in 6+ oxidation state respectively, whereas the FESEM and HRTEM analysis substantiated the uniformity of the coated layer with the interlayer spacing of the 0.369 nm. Additionally, the probable formation of individual WO3 nanoparticles or clusters was ruled out. The as-synthesized impregnated photocatalysts, in comparison to pure g-C3N4, were subjected to natural sunlight exposure for the photocatalytic removal of chlorophenol derivatives (2-CP, 3-CP, 4-CP, 2,3-DCP, 2,4-DCP, 2,4,6-TCP and PCP) that revealed the 5 wt% coating as the optimum level for significant removal. The progress of the photocatalytic process was monitored by periodic HPLC analysis whereas ion chromatography (IC) was used for the estimation of released ions. The mineralization capability of the as-synthesized W6+ coated catalysts was measured by the time scale TOC measurements. As the formation of intermediates was indicated in HPLC analysis, selected samples were subjected to GC-MS analysis for the identification of the nature of intermediates. The variable degree of removal of chlorophenol derivatives signified the role of the position and orientation of Cl group. The kinetics of the removal process was evaluated with the calculation of rate constants. The results extracted from the analytical tools and the associated band edge potentials were correlated to speculate the probable mechanism as well as the identification of major reactive oxygen species (ROS) involved in the removal process.
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Affiliation(s)
- Duna A K Alenazi
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, 21589, Saudi Arabia; Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah, 21589, Saudi Arabia; Department of Chemistry, Faculty of Science, Tabuk University, Tabuk, 71491, Saudi Arabia
| | - Sivaraman Chandrasekaran
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - M Tahir Soomro
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - M Aslam
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
| | - A Hameed
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, 21589, Saudi Arabia; National Centre for Physics, Quaid-e-Azam University, Islamabad, 44000, Pakistan.
| | - Shahid Ali
- Center of Research Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia
| | - Ekram Y Danish
- Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah, 21589, Saudi Arabia
| | - Iqbal M I Ismail
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, 21589, Saudi Arabia; Chemistry Department, Faculty of Science, King Abdulaziz University, PO Box 80203, Jeddah, 21589, Saudi Arabia
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7
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Altinsoy I, Guy N, Ozacar M, Bindal C. Preparation of ZnWO4 (Sanmartinite) Powder Through Mechanochemical Method for Visible Light-Induced Photocatalysis. Arab J Sci Eng 2021. [DOI: 10.1007/s13369-020-04859-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Poolakkandy RR, Menamparambath MM. Soft-template-assisted synthesis: a promising approach for the fabrication of transition metal oxides. Nanoscale Adv 2020; 2:5015-5045. [PMID: 36132034 PMCID: PMC9417152 DOI: 10.1039/d0na00599a] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 09/18/2020] [Indexed: 05/27/2023]
Abstract
The past few decades have witnessed transition metal oxides (TMOs) as promising candidates for a plethora of applications in numerous fields. The exceptional properties retained by these materials have rendered them of paramount emphasis as functional materials. Thus, the controlled and scalable synthesis of transition metal oxides with desired properties has received enormous attention. Out of different top-down and bottom-up approaches, template-assisted synthesis predominates as an adept approach for the facile synthesis of transition metal oxides, owing to its phenomenal ability for morphological and physicochemical tuning. This review presents a comprehensive examination of the recent advances in the soft-template-assisted synthesis of TMOs, focusing on the morphological and physicochemical tuning aided by different soft-templates. The promising applications of TMOs are explained in detail, emphasizing those with excellent performances.
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Affiliation(s)
| | - Mini Mol Menamparambath
- Department of Chemistry, National Institute of Technology Calicut Calicut-673601 Kerala India
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9
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Salcedo GM, Kupski L, de Oliveira Arias JL, Barbosa SC, Primel EG. Bojuru sand as a novel catalyst for refinery wastewater treatment and phenol degradation by heterogeneous photo catalysis. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112796] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Alhogbi BG, Aslam M, Hameed A, Qamar MT. The efficacy of Co 3O 4 loaded WO 3 sheets for the enhanced photocatalytic removal of 2,4,6-trichlorophenol in natural sunlight exposure. J Hazard Mater 2020; 397:122835. [PMID: 32446141 DOI: 10.1016/j.jhazmat.2020.122835] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 04/04/2020] [Accepted: 04/23/2020] [Indexed: 06/11/2023]
Abstract
Owing to the promising photocatalytic performance, the sheet-like WO3 was modified by depositing nanostructured Co3O4 at the surface. The appearance of the varying dual absorption edges in the optical analysis exposed the composite nature of the synthesized materials. The structural analysis revealed the deposition of Co3O4 particles at the surface without altering the lattice of WO3 however, during the processing the cracking of disc was also evidenced. The FESEM and HRTEM analysis corroborated the uniform surface dispersion of Co3O4 nanoparticles. The co-existence of 2+ and 3+ oxidation states of Co in the deposited Co3O4 was examined by XPS analysis. The efficient trapping of excitons by Co3O4 surface entities was witnessed in the emission measurements whereas the same was authenticated by the photo-electrochemical chronopotentiometry. The Co3O4 loaded sheets exhibited substantially enhanced activity for the removal of 2,4,6-trichlorophenol as compared to pure WO3 in the complete spectrum and visible region of natural sunlight exposure. The progress of the degradation process was monitored by HPLC whereas the degradation products were identified by GC-MS. The measurement and identification of the ion released during the photocatalytic process facilitated the estimation of the probable route and role of reactive oxygen species involved in the removal process. Although, the careful analysis of the findings from the analytical tools revealed the major involvement of hydroxyl radicals however, the role of superoxide anions was also exposed. An alternative mechanism of the generation of the superoxide radical involving the 2+ and 3+ oxidation states of Co was also proposed. The effect of the pH and the added concentration of H2O2 on the ease of removal process was also investigated.
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Affiliation(s)
- Basma G Alhogbi
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - M Aslam
- Center of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah 21589, Saudi Arabia.
| | - A Hameed
- National Centre for Physics, Quaid-e-Azam University, Islamabad 44000, Pakistan.
| | - M Tariq Qamar
- Department of Chemistry, Forman Christian College (A Chartered University), Ferozepur Road, Lahore 54600, Pakistan
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11
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Thwala MM, Dlamini LN. Photocatalytic reduction of Cr(VI) using Mg-doped WO 3 nanoparticles. Environ Technol 2020; 41:2277-2292. [PMID: 31181985 DOI: 10.1080/09593330.2019.1629635] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 06/05/2019] [Indexed: 06/09/2023]
Abstract
The hydrothermal synthesis method was employed for the fabrication of pristine tungsten trioxide (WO3) and that of varying dopant percentages (1, 3 and 5% m/m) of magnesium (Mg-WO3). The optical and structural properties of the synthesized materials were characterized using DRS, XRD, FTIR, TEM, BET, FESEM, XPS, PL, and Raman. Rectangular shaped nanostructures were observed through FESEM, wherein confirmed as monoclinic with the aid of XRD, FTIR and Raman analysis. Visualization of the doping was carried out using HRTEM imagery, which was also confirmed by a slight increase (0.0069 nm) of d spacing. As a consequence, band gaps were diminished and band edge positions were shifted. Band edge position shifts were confirmed via XPS analysis (0.08 eV). The point of zero charge was observed to shift towards positive upon doping at working pH 1 and 3.75 pH was the highest recorded. The rate of recombination was greatly reduced upon doping was observed through PL analysis. This was supported by DFT calculations, in which case the reduction of the rate of recombination was attributed to the introduction of Mg orbital. An improved efficiency was observed via the photo reduction of Cr(VI) metal ion in waste water, in which case, 97% reduction was attained.
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Affiliation(s)
- M M Thwala
- Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa
| | - L N Dlamini
- Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa
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12
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Zhou J, Wang C, Jia C, Zhou Y, Duo F, Wei Z. Intrinsic Photocatalysis of Morphology and Oxygen Vacancy‐Tunable Ultrathin WO
3
Nanosheets. ChemistrySelect 2020. [DOI: 10.1002/slct.202000325] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jianwei Zhou
- Institute of Energy and FuelXinxiang University Xinxiang, Henan 453003 China
| | - Chubei Wang
- Institute of Energy and FuelXinxiang University Xinxiang, Henan 453003 China
| | - Chunyan Jia
- College of Chemistry and Chemical EngineeringXinxiang University Xinxiang Henan 453003 China
| | - Yuan Zhou
- College of Chemistry and Chemical EngineeringXinxiang University Xinxiang Henan 453003 China
| | - Fangfang Duo
- Institute of Energy and FuelXinxiang University Xinxiang, Henan 453003 China
| | - Zhengyan Wei
- College of Chemistry and Chemical EngineeringXinxiang University Xinxiang Henan 453003 China
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13
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Sharma S, Basu S. Highly reusable visible light active hierarchical porous WO3/SiO2 monolith in centimeter length scale for enhanced photocatalytic degradation of toxic pollutants. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.115916] [Citation(s) in RCA: 92] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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14
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Quan H, Gao Y, Wang W. Tungsten oxide-based visible light-driven photocatalysts: crystal and electronic structures and strategies for photocatalytic efficiency enhancement. Inorg Chem Front 2020. [DOI: 10.1039/c9qi01516g] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Photocatalysis (PC) technology has received global attention due to its high potential of addressing both environmental and energy issues using only solar light as energy input.
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Affiliation(s)
- Haiqin Quan
- School of Materials Science and Engineering
- Shanghai University
- Shanghai 200444
- People's Republic of China
| | - Yanfeng Gao
- School of Materials Science and Engineering
- Shanghai University
- Shanghai 200444
- People's Republic of China
| | - Wenzhong Wang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
- Shanghai Institute of Ceramics
- Chinese Academy of Science
- Shanghai 200050
- People's Republic of China
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15
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Nady A, Salhi M, Harun SW. Passively Q-switched erbium-doped fiber laser utilizing tungsten oxide as a saturable absorber. Appl Opt 2019; 58:9768-9772. [PMID: 31873618 DOI: 10.1364/ao.58.009768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
We demonstrated a passively $Q$Q-switched fiber laser utilizing tungsten oxide (${\rm WO_{3}}$WO3) thin film as a saturable absorber (SA). The ${\rm WO_{3} {\text -} SA}$WO3-SA was sandwiched as a polymer composite film between fiber ferrules in an erbium-doped fiber cavity. ${\rm WO_{3}}$WO3 exhibits high nonlinear optical response characterized by an appropriate modulation depth of 10% and a saturation intensity of ${100}\;{{\rm MW/cm}^2}$100MW/cm2. The fiber cavity starts to generate a stable pulse train whereby as the pump power increases from 45 to 165 mw, the repetition rate increases from 16.75 to 56.3 kHz, while the pulse width decreases from 13.8 to 4.3 µs. The $Q$Q-switched laser generated maximum pulse energy of 6.6 nJ obtained at 165 mW, which was the maximum pump power available by the used laser diode. This is, to the best of our knowledge, the first demonstration of a $Q$Q-switched fiber laser based on the ${\rm WO_{3} {\text -} SA}$WO3-SA, which could contribute as a new potential SA material in the field of pulsed fiber lasers.
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16
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Aslam M, Tahir Soomro M, Ismail IM, Salah N, Waqar Ashraf M, Qari HA, Hameed A. The performance of silver modified tungsten oxide for the removal of 2-CP and 2-NP in sunlight exposure: Optical, electrochemical and photocatalytic properties. ARAB J CHEM 2019; 12:2632-43. [DOI: 10.1016/j.arabjc.2015.05.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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17
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Kadi MW, Hameed A, Mohamed R, Ismail IM, Alangari Y, Cheng HM. The effect of Pt nanoparticles distribution on the removal of cyanide by TiO2 coated Al-MCM-41 in blue light exposure. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2016.02.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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18
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Al-Qasmi N, Tahir Soomro M, Ismail IM, Danish EY, Al-Ghamdi AA. An enhanced electrocatalytic oxidation and determination of 2,4-dichlorophenol on multilayer deposited functionalized multi-walled carbon nanotube/Nafion composite film electrode. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2015.08.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Wang Q, Zhang C, Wu H, Gao Q, Duan R, Chen C. Fabrication of β-phase AgI and Bi2O3 co-decorated Bi2O2CO3 heterojunctions with enhanced photocatalytic performance. J Colloid Interface Sci 2019; 547:1-13. [DOI: 10.1016/j.jcis.2019.03.088] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 03/15/2019] [Accepted: 03/26/2019] [Indexed: 11/19/2022]
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20
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Nguyen TT, Nam SN, Son J, Oh J. Tungsten Trioxide (WO 3)-assisted Photocatalytic Degradation of Amoxicillin by Simulated Solar Irradiation. Sci Rep 2019; 9:9349. [PMID: 31249354 PMCID: PMC6597549 DOI: 10.1038/s41598-019-45644-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 06/12/2019] [Indexed: 11/23/2022] Open
Abstract
This study investigates the photocatalytic degradation of amoxicillin (AMO) by simulated solar irradiation using WO3 as a catalyst. A three-factor-three-level Box-Behnken design (BBD) consisting of 30 experimental runs is employed with three independent variables: initial AMO concentration, catalyst dosage, and pH. The experimental results are analyzed in terms of AMO degradation and mineralization, the latter of which is measured using dissolved organic carbon (DOC). The results show that the photocatalytic degradation of AMO follows pseudo-first-order kinetics. AMO degradation efficiency and the pseudo-first-order rate constants decrease with increasing initial AMO concentration and pH and increase with increasing catalyst dosage. Though AMO degradation is almost fully complete under the experimental conditions, DOC removal is much lower; the highest DOC removal rate is 35.82% after 180 min. Using these experimental results, second-order polynomial response surface models for AMO and DOC removal are constructed. In the AMO removal model, the first-order terms are the most significant contributors to the prediction, followed by the quadratic and interaction terms. Initial AMO concentration and pH have a significant negative impact on the photocatalytic degradation of AMO, while catalyst dosage has a significant positive impact. In contrast, in the DOC removal model, the quadratic terms make the most significant contribution to the prediction and the first-order terms the least. The optimal conditions for the photocatalytic degradation of AMO are found to be an initial AMO concentration of 1.0 μM, a catalyst dosage of 0.104 g/L, and a pH of 4, under which almost complete removal of AMO is achieved (99.99%).
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Affiliation(s)
- Thao Thi Nguyen
- Department of Civil and Environmental Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Seong-Nam Nam
- Department of Civil and Environmental Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
| | - Jooyoung Son
- Department of Civil and Environmental Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Jeill Oh
- Department of Civil and Environmental Engineering, Chung-Ang University, 84, Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
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Debnath D, Gupta AK, Ghosal PS. Recent advances in the development of tailored functional materials for the treatment of pesticides in aqueous media: A review. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2018.10.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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22
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Kása Z, Baia L, Magyari K, Hernádi K, Pap Z. Innovative visualization of the effects of crystal morphology on semiconductor photocatalysts. Tuning the Hückel polarity of the shape-tailoring agents: the case of Bi 2WO 6. CrystEngComm 2019. [DOI: 10.1039/c8ce01744a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Morphology was quantified for the first time; the rose-shape measured in “rosality-RSDC” was found to be directly related with the activity and structural properties.
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Affiliation(s)
- Zsolt Kása
- Institute of Environmental Science and Technology
- University of Szeged
- Szeged
- Hungary
- Department of Applied and Environmental Chemistry
| | - Lucian Baia
- Nanostructured Materials and Bio-Nano-Interfaces Centre
- Interdisciplinary Research Institute on Bio-Nano-Sciences
- Babeş-Bolyai University
- Cluj-Napoca
- Romania
| | - Klára Magyari
- Faculty of Physics
- Babeş-Bolyai University
- RO-400084 Cluj-Napoca
- Romania
| | - Klára Hernádi
- Department of Applied and Environmental Chemistry
- University of Szeged
- Szeged
- Hungary
| | - Zsolt Pap
- Institute of Environmental Science and Technology
- University of Szeged
- Szeged
- Hungary
- Faculty of Physics
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Le TA, Huynh TP. The Combination of Hydrogen and Methanol Production through Artificial Photosynthesis-Are We Ready Yet? ChemSusChem 2018; 11:2654-2672. [PMID: 29944207 DOI: 10.1002/cssc.201800731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 06/22/2018] [Indexed: 06/08/2023]
Abstract
Because 100 % quantum efficiency for the photosynthetic production of H2 from H2 O under visible illumination has been achieved recently, the oxidation of H2 O to O2 remains the bottleneck to the overall water-splitting reaction. Oxidation of CH4 to CH3 OH might be combined with water reduction instead, so that H2 and CH3 OH chemical fuels can be simultaneously produced through a one-step process under solar illumination. This combination would be a promising approach towards a more sustainable future of chemistry, in which developing different strategies for artificial photosynthesis is of paramount importance. By using free and adsorbed HO. radicals on the semiconductor surface, CH4 can be activated to H3 C. radicals and converted into CH3 OH, respectively, with great selectivity up to 100 %. The present lack of efficient photosynthetic systems for the formation of H2 and CH3 OH from abundant H2 O and CH4 motivates future research for basic science and industrial applications.
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Affiliation(s)
- Trung-Anh Le
- Laboratory of Physical Chemistry, Faculty of Science and Engineering, Åbo Akademi University, Porthaninkatu 3-5, 20500, Turku, Finland
| | - Tan-Phat Huynh
- Laboratory of Physical Chemistry, Faculty of Science and Engineering, Åbo Akademi University, Porthaninkatu 3-5, 20500, Turku, Finland
- Center of Functional Materials, Åbo Akademi University, 20500, Turku, Finland
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Aslam M, Qamar MT, Ali S, Rehman AU, Soomro MT, Ahmed I, Ismail IMI, Hameed A. Evaluation of SnO 2 for sunlight photocatalytic decontamination of water. J Environ Manage 2018; 217:805-814. [PMID: 29660706 DOI: 10.1016/j.jenvman.2018.04.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 04/04/2018] [Accepted: 04/08/2018] [Indexed: 06/08/2023]
Abstract
The broad bandgap tin (IV) oxide (SnO2) is the least investigated semiconductor material for photocatalytic water decontamination in sunlight exposure. A detailed study covering the synthesis, characterization and the evaluation of photocatalytic activity of SnO2, in the natural sunlight exposure, is presented. The structural characterization by XRD revealed the formation of phase pure tetragonal SnO2 with the average crystallite size of ∼41.5 nm whereas minor Sn2+ states in the material were identified by XPS analysis. As explored by diffuse reflectance (DR) and photoluminescence (PL) spectroscopy, the material exhibited a distinct absorption edge at ∼3.4 eV. The morphological and microstructure analysis of the synthesized SnO2 was carried out by FESEM and HRTEM. The electrochemical impedance spectroscopy (EIS) and chronopotentiometry (CP) predicted the better charge transport and retention ability of the material under illumination whereas the Mott-Schottky extrapolation prophesied the n-type behavior with the flat-band potential of -0.60 V. The photocatalytic activity of SnO2 was assessed in the exposure of complete spectrum natural sunlight for the removal of 2,4,6-trichlorophenol. The HPLC and TOC analysis monitored the progress of degradation and mineralization whereas the released chloride ions were evaluated by ion chromatography. The effect of the transition metal ions (Fe3+, Cu2+, Ni2+, and Zn2+) as electron capture agents and H2O2 as ROS generator was explored during the degradation process. The utility of the material for the simultaneous removal of chlorophenols in the mixture was also investigated. The SnO2 exhibited sustained activity in the repeated use. Based on experimental evidence congregated, the mechanism of the removal process and the efficacy of SnO2 for sunlight photocatalytic decontamination of water was established.
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Affiliation(s)
- M Aslam
- Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - M Tariq Qamar
- Department of Chemistry, Forman Christian College (A Chartered University), Ferozepur Road, Lahore, 54600, Pakistan
| | - Shahid Ali
- Center of Excellence in Nanotechnology, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
| | - Ateeq Ur Rehman
- School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4067, Australia
| | - M T Soomro
- Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Ikram Ahmed
- Department of Applied Chemistry, Government College University, Faisalabad 38000, Pakistan
| | - I M I Ismail
- Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia; Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - A Hameed
- Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia; National Center of Physics, Quaid-e-Azam University, Islamabad 44000, Pakistan.
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Hunge Y, Yadav A, Mahadik M, Mathe V, Bhosale C. A highly efficient visible-light responsive sprayed WO3/FTO photoanode for photoelectrocatalytic degradation of brilliant blue. J Taiwan Inst Chem Eng 2018; 85:273-81. [DOI: 10.1016/j.jtice.2018.01.048] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Boruah PK, Sharma B, Karbhal I, Shelke MV, Das MR. Ammonia-modified graphene sheets decorated with magnetic Fe 3O 4 nanoparticles for the photocatalytic and photo-Fenton degradation of phenolic compounds under sunlight irradiation. J Hazard Mater 2017; 325:90-100. [PMID: 27915103 DOI: 10.1016/j.jhazmat.2016.11.023] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/05/2016] [Accepted: 11/07/2016] [Indexed: 05/21/2023]
Abstract
Synthesis of easily separable and eco-friendly efficient catalyst with both photocatalytic and photo-Fenton degradation properties is of great importance for environment remediation application. Herein, ammonia-modified graphene (AG) sheets decorated with Fe3O4 nanoparticles (AG/Fe3O4) as a magnetically recoverable photocatalyst by a simple in situ solution chemistry approach. First, we have functionalized graphene oxide (GO) sheets by amide functional group and then Fe3O4 nanoparticles (NPs) are doped onto the functionalized GO surface. The AG/Fe3O4 nanocomposite showed efficient photocatalytic activity towards degradation of phenol (92.43%), 2-nitrophenol (2-NP) (98%) and 2-chlorophenol (2-CP) (97.15%) within 70-120min. Consequently, in case of photo-Fenton degradation phenomenon, 93.56% phenol, 98.76% 2-NP and 98.06% of 2-CP degradation were achieved within 50-80min using AG/Fe3O4 nanocomposite under sunlight irradiation. The synergistic effect between amide functionalized graphene and Fe3O4 nanoparticles (NPs) enhances the photocatalytic activity by preventing the recombination rate of electron-hole-pair in Fe3O4 NPs. Furthermore, the remarkable reusability of the AG/Fe3O4 nanocomposite was observed up to ten cycles during the photocatalytic degradation of these phenolic compounds.
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Affiliation(s)
- Purna K Boruah
- Advanced Materials Group, Materials Sciences and Technology Division, CSIR-North East Institute of Science & Technology, Jorhat 785006, India; Academy of Scientific and Innovative Research (AcSIR), India
| | - Bhagyasmeeta Sharma
- Advanced Materials Group, Materials Sciences and Technology Division, CSIR-North East Institute of Science & Technology, Jorhat 785006, India
| | - Indrapal Karbhal
- Academy of Scientific and Innovative Research (AcSIR), India; Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune-11008, Maharashtra, India
| | - Manjusha V Shelke
- Academy of Scientific and Innovative Research (AcSIR), India; Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune-11008, Maharashtra, India
| | - Manash R Das
- Advanced Materials Group, Materials Sciences and Technology Division, CSIR-North East Institute of Science & Technology, Jorhat 785006, India; Academy of Scientific and Innovative Research (AcSIR), India.
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Li F, Szeto W, Huang H, Li J, Leung DY. A Photocatalytic Rotating Disc Reactor with TiO₂ Nanowire Arrays Deposited for Industrial Wastewater Treatment. Molecules 2017; 22:E337. [PMID: 28241440 DOI: 10.3390/molecules22020337] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 02/06/2017] [Accepted: 02/14/2017] [Indexed: 12/03/2022] Open
Abstract
A photocatalytic rotating disc reactor (PRD-reactor) with TiO2 nanowire arrays deposited on a thin Ti plate is fabricated and tested for industrial wastewater treatment. Results indicate that the PRD-reactor shows excellent decolorization capability when tested with methyl orange (>97.5%). Advanced oxidation processes (AOP), including photocatalytic oxidation and photolytic reaction, occurred during the processing. Efficiency of the AOP increases with reduction in light absorption pathlength, which enhanced the photocatalytic reaction, as well as by increasing oxygen exposure of the wastewater thin film due to the rotating disc design. It is found that, with a small dosage of hydrogen peroxide, the mineralization efficiency of industrial biodegraded wastewater can be enhanced, with a superior mineralization of >75% total organic carbon (TOC) removal. This is due to the fact that the TiO2 photocatalysis and hydrogen peroxide processes generate powerful oxidants (hydroxyl radicals) that can strongly improve photocatalytic oxidation efficiency. Application of this industrial wastewater treatment system is benefited from the TiO2 nanowire arrays, which can be fabricated by a mild solvothermal method at 80 °C and under atmospheric pressure. Similar morphologies and microstructures are found for the TiO2 nanowire arrays deposited on a large metal Ti disc, which makes the wastewater treatment process more practical and economical.
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28
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Qamar M, Aslam M, Rehan Z, Soomro M, Basahi JM, Ismail IM, Hameed A. The effect of Fe3+ based visible light receptive interfacial phases on the photocatalytic activity of ZnO for the removal of 2,4-dichlorophenoxy acetic acid in natural sunlight exposure. Sep Purif Technol 2017; 172:512-28. [DOI: 10.1016/j.seppur.2016.08.030] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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29
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Gondal MA, Adeseda A, Rashid S, Hameed A, Aslam M, Ismail IM, Baig U, Dastageer MA, Al-arfaj A, Rehman AU. Facile synthesis, characterization and photocatalytic performance of Au-Ag alloy nanoparticles dispersed on graphitic carbon nitride under visible light irradiations. ACTA ACUST UNITED AC 2016; 423:114-25. [DOI: 10.1016/j.molcata.2016.06.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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30
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Jang JS, Hong SJ, Kim ES, Kim HG, Choi SH, Lee JS. Photocatalytic activity of electron-deficient and porous WO 3 nanoparticles derived from thermal oxidation of bulk WC particles. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2016.07.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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31
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Salah N, Hameed A, Aslam M, Babkair SS, Bahabri FS. Photocatalytic activity of V doped ZnO nanoparticles thin films for the removal of 2- chlorophenol from the aquatic environment under natural sunlight exposure. J Environ Manage 2016; 177:53-64. [PMID: 27082257 DOI: 10.1016/j.jenvman.2016.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 03/30/2016] [Accepted: 04/05/2016] [Indexed: 06/05/2023]
Abstract
Vanadium doped ZnO powders were used as precursors to deposit thin films of V(5+) incorporated ZnO nanoparticles on glass substrates by the pulsed laser deposition technique. The observed variations in Raman signals, visible region shift in the diffuse reflectance spectra along with a small shift in the (101) reflections of the X-ray diffraction (XRD) confirmed the insertion of V(5+) ions in ZnO lattice. No other additional reflection in the XRD results other than ZnO further endorsed the occupation of lattice positions by V entities rather than independent oxide formation. The asymmetric XPS peaks of Zn2p and V2p core levels confirmed the existence of both in the vicinity. The existence of minimal proportion of V(3+) along with V(5+) states varied the alteration of the oxidation states V in the synthetic route. The SEM images at various resolutions displayed the uniform distribution identical nanoparticles without the presence of additional phases in the deposited films. The SEM cross-section measurements revealed the uniform thickness of ∼90 nm of each film, whereas the surface studies of the films were performed by AFM. The as-synthesized films were tested for photocatalytic activity in sunlight illumination for the removal of 2-chlorophenol. The unique feature of the study was the estimation of the photocatalytic activity 20 ppm of 2-chlorophenol by exposing the low exposed area. The degradation of the substrate was measured by liquid phase UV-vis spectroscopy, whereas total organic carbon measurement revealed the mineralization of the substrate. The released Cl(-) ions were also measured by ion chromatography. The estimated flatband potentials and pHzpc values of the V doped materials, by Mott-Schottky analysis and zeta potential measurements respectively, were correlated with the photocatalytic activity. The kinetics of the photocatalytic degradation/mineralization process was estimated and results were correlated with the plausible mechanism.
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Affiliation(s)
- Numan Salah
- Center of Nanotechnology, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
| | - A Hameed
- Center of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, 21589, Saudi Arabia; National Centre for Physics, Quaid-e-Azam University, Islamabad 44000, Pakistan
| | - M Aslam
- Center of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Saeed S Babkair
- Department of Physics, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - F S Bahabri
- Sciences Faculty for Girls, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
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Li Q, Zhou D, Zhang P, Man P, Tian Z, Li Y, Ai S. The BiOBr/regenerated cellulose composite film as a green catalyst for light degradation of phenol. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.04.054] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Darabdhara G, Boruah PK, Borthakur P, Hussain N, Das MR, Ahamad T, Alshehri SM, Malgras V, Wu KCW, Yamauchi Y. Reduced graphene oxide nanosheets decorated with Au-Pd bimetallic alloy nanoparticles towards efficient photocatalytic degradation of phenolic compounds in water. Nanoscale 2016; 8:8276-87. [PMID: 27030997 DOI: 10.1039/c6nr00231e] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Reduced graphene oxide nanosheets decorated with Au-Pd bimetallic alloy nanoparticles are successfully prepared via a chemical approach consisting of reducing the metal precursors using ascorbic acid as reductant at an elevated temperature. The prepared nanocomposite is employed as a photocatalyst for the degradation of organic contaminants such as phenol, 2-chlorophenol (2-CP), and 2-nitrophenol (2-NP). The complete degradation of phenol is achieved after 300 min under natural sunlight irradiation whereas the degradation of 2-CP and 2-NP is completed after 180 min. The activity of the photocatalyst is evaluated considering several parameters such as the initial phenol concentration, the photocatalyst loading, and the pH of the solution. The degradation kinetics of all the compounds is carefully studied and found to follow a linear Langmuir-Hinshelwood model. Furthermore, the reusability of the photocatalyst is successfully achieved up to five cycles and the catalyst exhibits an excellent stability.
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Affiliation(s)
- Gitashree Darabdhara
- Materials Science Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India. and Academy of Scientific and Innovative Research, India
| | - Purna K Boruah
- Materials Science Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India. and Academy of Scientific and Innovative Research, India
| | - Priyakshree Borthakur
- Materials Science Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India. and Academy of Scientific and Innovative Research, India
| | - Najrul Hussain
- Materials Science Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India. and Academy of Scientific and Innovative Research, India
| | - Manash R Das
- Materials Science Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India. and Academy of Scientific and Innovative Research, India
| | - Tansir Ahamad
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
| | - Saad M Alshehri
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
| | - Victor Malgras
- National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Kevin C-W Wu
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan.
| | - Yusuke Yamauchi
- National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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Székely I, Kovács G, Baia L, Danciu V, Pap Z. Synthesis of Shape-Tailored WO₃ Micro-/Nanocrystals and the Photocatalytic Activity of WO₃/TiO₂ Composites. Materials (Basel) 2016; 9:ma9040258. [PMID: 28773386 PMCID: PMC5502922 DOI: 10.3390/ma9040258] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 03/21/2016] [Accepted: 03/24/2016] [Indexed: 11/24/2022]
Abstract
A traditional semiconductor (WO3) was synthesized from different precursors via hydrothermal crystallization targeting the achievement of three different crystal shapes (nanoplates, nanorods and nanostars). The obtained WO3 microcrystals were analyzed by the means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and diffuse reflectance spectroscopy (DRS). These methods contributed to the detailed analysis of the crystal morphology and structural features. The synthesized bare WO3 photocatalysts were totally inactive, while the P25/WO3 composites were efficient under UV light radiation. Furthermore, the maximum achieved activity was even higher than the bare P25’s photocatalytic performance. A correlation was established between the shape of the WO3 crystallites and the observed photocatalytic activity registered during the degradation of different substrates by using P25/WO3 composites.
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Affiliation(s)
- István Székely
- Faculty of Chemistry and Chemical Engineering, Babeș-Bolyai University, Arany János 11, Cluj-Napoca RO-400028, Romania.
| | - Gábor Kovács
- Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu 1, Cluj-Napoca RO-400084, Romania.
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged HU-6720, Hungary.
- Institute for Interdisciplinary Research on Bio-Nano-Sciences, Treboniu Laurian 42, Cluj-Napoca RO-400271, Romania.
| | - Lucian Baia
- Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu 1, Cluj-Napoca RO-400084, Romania.
- Institute for Interdisciplinary Research on Bio-Nano-Sciences, Treboniu Laurian 42, Cluj-Napoca RO-400271, Romania.
| | - Virginia Danciu
- Faculty of Chemistry and Chemical Engineering, Babeș-Bolyai University, Arany János 11, Cluj-Napoca RO-400028, Romania.
| | - Zsolt Pap
- Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu 1, Cluj-Napoca RO-400084, Romania.
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged HU-6720, Hungary.
- Institute for Interdisciplinary Research on Bio-Nano-Sciences, Treboniu Laurian 42, Cluj-Napoca RO-400271, Romania.
- Institute of Environmental Science and Technology, Tisza Lajos krt. 103, Szeged HU-6720, Hungary.
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35
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Aslam M, Qamar MT, Soomro MT, Ismail IMI, Rehan ZA, Ashraf MW, Hameed A. The effect of cerium alteration on the photocatalytic performance of WO3 in sunlight exposure for water decontamination. RSC Adv 2016. [DOI: 10.1039/c5ra22002e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In an effort to enhance the photocatalytic activity of cubic WO3 in sunlight exposure, its surface was modified by impregnating the Ce3+ ions ranging from 1% to 25% with a step of 5% with respect to the weight of WO3.
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Affiliation(s)
- M. Aslam
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
| | - M. Tariq Qamar
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
- Chemistry Department
| | - M. Tahir Soomro
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
| | - Iqbal M. I. Ismail
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
- Chemistry Department
| | - Zulfiqar Ahmad Rehan
- Chemistry Department
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
| | - M. Waqar Ashraf
- Department of Mathematics & Natural Sciences
- Prince Mohammad Bin Fahd University
- Al Khobar 31952
- Saudi Arabia
| | - A. Hameed
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
- National Centre for Physics
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Chen XJ, Dai YZ, Wang XY, Guo J, Liu TH, Li FF. Synthesis and characterization of Ag₃PO₄ immobilized with graphene oxide (GO) for enhanced photocatalytic activity and stability over 2,4-dichlorophenol under visible light irradiation. J Hazard Mater 2015; 292:9-18. [PMID: 25781371 DOI: 10.1016/j.jhazmat.2015.01.032] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Revised: 01/08/2015] [Accepted: 01/10/2015] [Indexed: 06/04/2023]
Abstract
A series of visible-light responsive photocatalysts prepared using Ag3PO4 immobilized with graphene oxide (GO) with varying GO content were obtained by an electrostatically driven method, and 2,4-dichlorophenol (2,4-DCP) was used to evaluate the performance of the photocatalysts. The composites exhibited superior photocatalytic activity and stability compared with pure Ag3PO4. When the content of GO was 5%, the degradation efficiency of 2,4-DCP could reach 98.95%, and 55.91% of the total organic (TOC) content was removed within 60 min irradiation. Meanwhile, the efficiency of 91.77% was achieved for 2,4-DCP degradation even after four times of recycling in the photocatalysis/Ag3PO4-GO (5%) system. Reactive species of O2(˙-), OH˙ and h(+) were considered as the main participants for oxidizing 2,4-DCP, as confirmed by the free radical capture experiments. And some organic intermediates including 4-chlorophenol (4-CP), hydroquinone (HQ), benzoquinone (BZQ), 2-chlorohydroquinone and hydroxyhydroquinone (HHQ) were detected by comparison with the standard retention times from the high performance liquid chromatography (HPLC). In short, the enhanced photocatalytic property of Ag3PO4-GO was closely related to the strong absorption ability of GO relative to 2,4-DCP, the effective separation of photogenerated electron-hole pairs, and the excellent electron capture capability of GO.
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Affiliation(s)
- Xiao-juan Chen
- Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
| | - You-zhi Dai
- Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China.
| | - Xing-yan Wang
- Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
| | - Jing Guo
- Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
| | - Tan-hua Liu
- Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
| | - Fen-fang Li
- Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China; Department of Environmental Science, Changsha Environmental Protection Vocational College, Changsha410004, PR China
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Qamar MT, Aslam M, Ismail IMI, Salah N, Hameed A. Synthesis, Characterization, and Sunlight Mediated Photocatalytic Activity of CuO Coated ZnO for the Removal of Nitrophenols. ACS Appl Mater Interfaces 2015; 7:8757-8769. [PMID: 25849739 DOI: 10.1021/acsami.5b01273] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
CuO@ZnO core-shell catalysts, coated by varying the CuO layer density ranging from 0.5% to 10%, were synthesized with the aim to enhance the photocatalytic activity of ZnO in sunlight and control its photocorrosion. Initially, the Cu(2+) ions were impregnated on presynthesized ZnO by wet impregnation and finally converted to CuO layers by calcination. The optical and structural characterization of the synthesized powders was performed by DRS, PL, Raman spectroscopy, and XRD analysis, respectively. The homogeneity of the coated layers was explored by FESEM. The photocatalytic activity of CuO coated ZnO was investigated for the degradation of mononitrophenols (2-, 3-, and 4-nitrophenol) and dinitrophenols (2,4-, 2,5-, and 2,6-dinitrophenol) in the exposure of the complete spectrum and visible region (420-800 nm) of sunlight. The effect of the increasing density coated layers of CuO on photocatalytic activity was evaluated for the degradation of 4-NP. Compared to pristine ZnO, a substantial increase in the degradation/mineralization ability was observable for the catalysts coated with 0.5% and 1% CuO, whereas a detrimental effect was noticed for higher coating density. Prior to photocatalytic studies, as evaluated by cyclic voltammetry (CV), compared to pure ZnO, a significant suppression of photocorrosion was noticed, under illumination, for catalysts coated with lower CuO coating. The progress of the photocatalytic degradation process was monitored by HPLC while the mineralization ability of the synthesized catalysts was estimated by TOC. The estimation of the released ions and their further interaction with the excited states and the reactive oxygen was monitored by ion chromatography (IC).
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Affiliation(s)
| | | | | | | | - A Hameed
- ∥National Centre for Physics, Quaid-e-Azam University, Islamabad 44000, Pakistan
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Aslam M, Ismail IMI, Salah N, Chandrasekaran S, Qamar MT, Hameed A. Evaluation of sunlight induced structural changes and their effect on the photocatalytic activity of V2O5 for the degradation of phenols. J Hazard Mater 2015; 286:127-135. [PMID: 25569447 DOI: 10.1016/j.jhazmat.2014.12.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 12/02/2014] [Accepted: 12/08/2014] [Indexed: 05/28/2023]
Abstract
Despite knowing the fact that vanadium pentoxide is slightly soluble in aqueous medium, its photocatalytic activity was evaluated for the degradation of phenol and its derivatives (2-hydroxyphenol, 2-chlorophenol, 2-aminophenol and 2-nitrophenol) in natural sunlight exposure. The prime objective of the study was to differentiate between the homogeneous and heterogeneous photocatalysis incurred by dissolved and undissolved V2O5 in natural sunlight exposure. V2O5 was synthesized by chemical precipitation procedure using Triton X-100 as morphology mediator and characterized by DRS, PLS, Raman, FESEM and XRD. A lower solubility of ∼ 5% per 100ml of water at 23 °C was observed after calcination at 600 °C. The study revealed no contribution of the dissolved V2O5 in the photocatalytic process. In sunlight exposure, V2O5 powder exhibited substantial activity for the degradation, however, a low mineralization of phenolic substrates was observed. The initial low activity of V2O5 followed by a sharp increase both in degradation and mineralization in complete spectrum sunlight exposure, was further investigated that revealed the decrease in the bandgap and the reduction in the particle size with the interaction of UV photons (<420 nm) as this effect was not observable in the exposure of visible region of sunlight. The role of the chemically different substituents attached to an aromatic ring at 2-positions and the secondary interaction of released ions during the degradation process with the reactive oxygen species (ROS) was also explored.
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Affiliation(s)
- M Aslam
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Iqbal M I Ismail
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah 21589, Saudi Arabia; Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Numan Salah
- Centre of Nanotechnology, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - S Chandrasekaran
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - M Tariq Qamar
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah 21589, Saudi Arabia; Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - A Hameed
- Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah 21589, Saudi Arabia; National Centre for Physics, Quaid-e-Azam University, Islamabad 44000, Pakistan.
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Liu JX, Shi F, Dong XL, Liu SH, Fan CY, Yin S, Sato T. Morphology and phase controlled synthesis of CsxWO3 powders by solvothermal method and their optical properties. POWDER TECHNOL 2015. [DOI: 10.1016/j.powtec.2014.10.032] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Abstract
Monoclinic nanocuboid WO3 enhanced the photocatalyst efficiency of quasi nanobelt zinc oxide for dye degradation in the presence of visible light radiation.
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Affiliation(s)
- Sangeeta Adhikari
- Department of Ceramic Engineering
- National Institute of Technology
- Rourkela
- India
| | - Debasish Sarkar
- Department of Ceramic Engineering
- National Institute of Technology
- Rourkela
- India
| | - Giridhar Madras
- Department of Chemical Engineering
- Indian Institute of Science
- Bangalore
- India
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41
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Aslam M, Soomro MT, Ismail IMI, Qari HA, Gondal MA, Hameed A. The facile synthesis, characterization and evaluation of photocatalytic activity of bimetallic FeBiO3 in natural sunlight exposure. RSC Adv 2015. [DOI: 10.1039/c5ra18808c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In an effort to develop sunlight active photocatalysts for environmental remediation, a phase pure bimetallic oxide, FeBiO3, was synthesized by a facile route.
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Affiliation(s)
- M. Aslam
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
| | - M. Tahir Soomro
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
| | - Iqbal M. I. Ismail
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
- Chemistry Department
| | - Huda A. Qari
- Department of Biological Sciences
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - M. A. Gondal
- Department of Physics
- King Fahd University of Petroleum and Minerals
- Dhahran 31261
- Saudi Arabia
| | - A. Hameed
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589
- Kingdom of Saudi Arabia
- National Centre for Physics
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Rashid SG, Gondal MA, Hameed A, Aslam M, Dastageer MA, Yamani ZH, Anjum DH. Synthesis, characterization and visible light photocatalytic activity of Cr3+, Ce3+and N co-doped TiO2for the degradation of humic acid. RSC Adv 2015. [DOI: 10.1039/c5ra00714c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The synthesis, characterization and photocatalytic activity of Cr3+and Ce3+co-doped TiON (N-doped TiO2) for the degradation of humic acid with exposure to visible light is reported.
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Affiliation(s)
- S. G. Rashid
- Laser Research Group
- Physics Department and Center of Excellence in Nanotechnology (CENT)
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - M. A. Gondal
- Laser Research Group
- Physics Department and Center of Excellence in Nanotechnology (CENT)
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - A. Hameed
- Center of Excellence in Environmental Studies
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
- National Centre for Physics
| | - M. Aslam
- Center of Excellence in Environmental Studies
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - M. A. Dastageer
- Laser Research Group
- Physics Department and Center of Excellence in Nanotechnology (CENT)
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - Z. H. Yamani
- Laser Research Group
- Physics Department and Center of Excellence in Nanotechnology (CENT)
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - D. H. Anjum
- Applied Surface Science Nanofabrication
- Imaging & Characterization Core Lab
- King Abdullah University of Science & Technology (KAUST)
- Thuwal 23599-6900
- Saudi Arabia
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Jayaraman T, Arumugam Raja S, Priya A, Jagannathan M, Ashokkumar M. Synthesis of a visible-light active V2O5–g-C3N4 heterojunction as an efficient photocatalytic and photoelectrochemical material. NEW J CHEM 2015. [DOI: 10.1039/c4nj01807a] [Citation(s) in RCA: 160] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Synergistic enhancement of the photocatalytic degradation of DR81 using V2O5–g-C3N4 is due to an increase in visible-light absorption efficiency and rapid photoinduced charge separation.
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Affiliation(s)
| | | | - Annadurai Priya
- Solar Energy Lab
- Department of Chemistry
- Thiruvalluvar University
- Vellore-632 115
- India
| | - Madhavan Jagannathan
- Solar Energy Lab
- Department of Chemistry
- Thiruvalluvar University
- Vellore-632 115
- India
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Aslam M, Ismail IMI, Chandrasekaran S, Almeelbi T, Hameed A. The suitability of Ce3+-modified ZnO photocatalyst for the mineralization of monochlorophenol isomers in sunlight exposure. RSC Adv 2014. [DOI: 10.1039/c4ra07038k] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The photocatalytic activity of Ce3+-modified hexagonal ZnO for the degradation/mineralization of monochlorophenol isomers (2-chlorophenol, 3-chlorophenol and 4-chlorophenol), in natural sunlight exposure, is reported.
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Affiliation(s)
- Mohammad Aslam
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589, Saudi Arabia
| | - Iqbal M. I. Ismail
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589, Saudi Arabia
- Chemistry Department
- Faculty of Science
| | - Sivaraman Chandrasekaran
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589, Saudi Arabia
| | - Talal Almeelbi
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589, Saudi Arabia
- Department of Environmental Sciences
- King Abdulaziz University
| | - Abdul Hameed
- Centre of Excellence in Environmental Studies (CEES)
- King Abdulaziz University
- Jeddah 21589, Saudi Arabia
- National Centre for Physics
- Quaid-e-Azam University
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45
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Rahimnejad S, He JH, Chen W, Wu K, Xu GQ. Tuning the electronic and structural properties of WO3 nanocrystals by varying transition metal tungstate precursors. RSC Adv 2014. [DOI: 10.1039/c4ra10650d] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
WO3 nanoplates derived from NiWO4 were found to have the highest concentration of oxygen vacancy, narrowest band gap, longest electron–hole recombination time, and in turn the highest rate of photodegradation of azo dye methylene blue.
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Affiliation(s)
- Sara Rahimnejad
- Department of Chemistry
- National University of Singapore
- , Singapore
- SPURc
- Singapore 138602, Singapore
| | - Jing Hui He
- Department of Chemistry
- National University of Singapore
- , Singapore
- SPURc
- Singapore 138602, Singapore
| | - Wei Chen
- Department of Chemistry
- National University of Singapore
- , Singapore
- Department of Physics
- National University of Singapore
| | - Kai Wu
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing, P. R. China
- SPURc
| | - Guo Qin Xu
- Department of Chemistry
- National University of Singapore
- , Singapore
- SPURc
- Singapore 138602, Singapore
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