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Janani FZ, Khiar H, Taoufik N, Elhalil A, Sadiq M', Mansouri S, Barka N. ZnO-Zn 2TiO 4 heterostructure for highly efficient photocatalytic degradation of pharmaceuticals. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022:1-14. [PMID: 36044150 PMCID: PMC9430018 DOI: 10.1007/s11356-022-22791-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
In this study, ZnO-Zn2TiO4 (ZTM) material was prepared through a novel synthesis method based on a ultrasound-assisted polyol-mediated process followed by calcination at a different temperature. Physical features of the samples were studied by using various analysis techniques including XRD, FT-IR, SEM/EDX, pHPZC, and UV-Vis DRS. Subsequently, the materials were employed as catalysts for the photocatalytic degradation of clofibric acid as a model pharmaceutical contaminant. The photocatalytic performance was evaluated under different conditions of calcination temperature, catalyst dosage, starting concentration, and initial pH of clofibric acid solution. The finding results revealed that hexagonal-tetragonal phases of ZnO-Zn2TiO4 calcined at 600 °C (ZTM-600) with an average crystallite size of 97.8 Å exhibited the best degradation efficiency (99%). The primary bands characteristic of ZnO and Zn2TiO4 were displayed by FT-IR analysis and the UV-visible DRS confirms the larger absorption capacity in UV-visible regions. The photogenerated electrons are the powerful reactive species involved in clofibric acid photodegradation process. This study shows a promising photocatalyst and provides new sight to rational design the facets of photocatalysis process for enhanced photocatalytic performances and effective wastewater treatment.
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Affiliation(s)
- Fatima Zahra Janani
- Sultan Moulay Slimane University of Beni Mellal, Multidisciplinary Research and Innovation Laboratory, FP Khouribga, BP.145, 2500, Khouribga, Morocco
| | - Habiba Khiar
- Sultan Moulay Slimane University of Beni Mellal, Multidisciplinary Research and Innovation Laboratory, FP Khouribga, BP.145, 2500, Khouribga, Morocco
| | - Nawal Taoufik
- Sultan Moulay Slimane University of Beni Mellal, Multidisciplinary Research and Innovation Laboratory, FP Khouribga, BP.145, 2500, Khouribga, Morocco
| | - Alaâeddine Elhalil
- Laboratory of Process and Environmental Engineering, Higher School of Technology, Hassan II University of Casablanca, Casablanca, Morocco
| | - M 'hamed Sadiq
- Sultan Moulay Slimane University of Beni Mellal, Multidisciplinary Research and Innovation Laboratory, FP Khouribga, BP.145, 2500, Khouribga, Morocco
| | - Said Mansouri
- Materials Science Energy and Nanoengineering Department (MSN), VI Polytechnic University (UM6P), Lot 660-Hay Moulay Rachid, 43150, Benguerir, Mohammed, Morocco
| | - Noureddine Barka
- Sultan Moulay Slimane University of Beni Mellal, Multidisciplinary Research and Innovation Laboratory, FP Khouribga, BP.145, 2500, Khouribga, Morocco.
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Behineh ES, Solaimany Nazar AR, Farhadian M, Moghadam M. Photocatalytic degradation of cefixime using visible light-driven Z-scheme ZnO nanorod/Zn 2TiO 4/GO heterostructure. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 316:115195. [PMID: 35537268 DOI: 10.1016/j.jenvman.2022.115195] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 04/05/2022] [Accepted: 04/26/2022] [Indexed: 06/14/2023]
Abstract
ZnO nanorod along with a Zn2TiO4/GO heterostructure with enhanced charge transfer capability was synthesized by a facile sol-gel method. FT-IR, XRD, XPS, TEM, SEM, EDX, UV-Vis DRS, photocurrent response and PL analyses were applied to characterize the as-prepared photocatalysts. To investigate the photocatalytic activity of the composite, Cefixime (CEF) removal under visible light was evaluated. The ZnO nanorod/Zn2TiO4/GO, including 65 wt% ZnO and 3 wt% graphene oxide, showed the highest CEF degradation and was selected as the optimal ternary composite. Reduction of electron-hole pair recombination rate, successful interfacial charge transfers, and more visible light reception in the Z-scheme system were the important reasons for improving the photocatalytic properties of ZnO nanorod/Zn2TiO4/GO. Effective operating parameters in the CEF photocatalytic removal process were optimized employing the response surface method and were as follows: photocatalyst dosage = 0.88 g/L, pH = 5, radiation time = 115 min, and CEF concentration = 10 ppm. The photocatalytic degradation% of CEF and total organic carbon (TOC) removal% under the optimal conditions were 71.4 and 57.5%, respectively, for the three-component composite indicating the production of intermediate species during the process. This photocatalytic reaction confirmed the first-order kinetic and using the ZnO nanorod/Zn2TiO4/GO composite was able to improve the reaction rate by about 2.7 and 6.2 times more than ZnO nanorod/Zn2TiO4 and ZnO, respectively. The effects of radiation intensity and temperature were investigated and 175 W/m2 and 35 °C were obtained as optimum values. Eventually, according to the trapping test, h+, superoxide radical, and hydroxyl radical are the most effective active species in this photocatalytic reaction, respectively.
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Affiliation(s)
- Elham Sadat Behineh
- Chemical Engineering Department Faculty of Engineering of the University of Isfahan, Isfahan, Iran.
| | - Ali Reza Solaimany Nazar
- Chemical Engineering Department Faculty of Engineering of the University of Isfahan, Isfahan, Iran.
| | - Mehrdad Farhadian
- Chemical Engineering Department Faculty of Engineering of the University of Isfahan, Isfahan, Iran.
| | - Majid Moghadam
- Chemistry Department, Catalysis Division, University of Isfahan, Isfahan, Iran.
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Mahajan J, Jeevanandam P. Synthesis of Zn
2
TiO
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@CdS Core‐shell Heteronanostructures by Novel Thermal Decomposition Approach for Photocatalytic Application. ChemistrySelect 2019. [DOI: 10.1002/slct.201903544] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jatin Mahajan
- Department of ChemistryIndian Institute of Technology Roorkee Roorkee- 247667 India
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Core-shell nanowire arrays based on ZnO and Cu xO for water stable photocatalysts. Sci Rep 2019; 9:17268. [PMID: 31754165 PMCID: PMC6872873 DOI: 10.1038/s41598-019-53873-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 11/06/2019] [Indexed: 11/22/2022] Open
Abstract
Staggered gap radial heterojunctions based on ZnO-CuxO core-shell nanowires are used as water stable photocatalysts to harvest solar energy for pollutants removal. ZnO nanowires with a wurtzite crystalline structure and a band gap of approximately 3.3 eV are obtained by thermal oxidation in air. These are covered with an amorphous CuxO layer having a band gap of 1.74 eV and subsequently form core-shell heterojunctions. The electrical characterization of the ZnO pristine and ZnO-CuxO core-shell nanowires emphasizes the charge transfer phenomena at the junction and at the interface between the nanowires and water based solutions. The methylene blue degradation mechanism is discussed taking into consideration the dissolution of ZnO in water based solutions for ZnO nanowires and ZnO-CuxO core-shell nanowires with different shell thicknesses. An optimum thickness of the CuxO layer is used to obtain water stable photocatalysts, where the ZnO-CuxO radial heterojunction enhances the separation and transport of the photogenerated charge carriers when irradiating with UV-light, leading to swift pollutant degradation.
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Zou X, Dong Y, Yuan C, Ge H, Ke J, Cui Y. Zn2SnO4 QDs decorated Bi2WO6 nanoplates for improved visible-light-driven photocatalytic removal of gaseous contaminants. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2018.12.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Li X, Liu Y, Li S, Huang J, Wu Y, Yu D. The Sensing Properties of Single Y-Doped SnO 2 Nanobelt Device to Acetone. NANOSCALE RESEARCH LETTERS 2016; 11:470. [PMID: 27770426 PMCID: PMC5074997 DOI: 10.1186/s11671-016-1685-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 10/07/2016] [Indexed: 05/24/2023]
Abstract
Pure SnO2 and Y-doped SnO2 nanobelts were prepared by thermal evaporation at 1350 °C in the presence of Ar carrier gas (30 sccm). The samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersion spectrometer (EDS), X-ray photoelectron spectrometer (XPS), UV-Vis absorption spectroscopy, Raman spectroscopy, and Fourier transform infrared spectrum (FTIR). The sensing properties of the devices based on a single SnO2 nanobelt and Y-doped SnO2 nanobelt were explored to acetone, ethanol, and ethanediol. It reveals that the sensitivity of single Y-doped SnO2 nanobelt device is 11.4 to 100 ppm of acetone at 210 °C, which is the highest response among the three tested VOC gases. Y3+ ions improve the sensitivity of SnO2 sensor and have an influence on the optical properties of Y-doped SnO2 nanobelts.
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Affiliation(s)
- Xinmin Li
- Key Laboratory of Yunnan Higher Education Institutes for Optoelectronic Information and Technology, Kunming, 650500 People’s Republic of China
- Institute of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500 People’s Republic of China
| | - Yingkai Liu
- Key Laboratory of Yunnan Higher Education Institutes for Optoelectronic Information and Technology, Kunming, 650500 People’s Republic of China
- Key Laboratory of Yunnan Normal University for Photoelectric Materials & Device, Kunming, 650500 People’s Republic of China
- Institute of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500 People’s Republic of China
| | - Shuanghui Li
- Key Laboratory of Yunnan Higher Education Institutes for Optoelectronic Information and Technology, Kunming, 650500 People’s Republic of China
- Institute of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500 People’s Republic of China
| | - Jieqing Huang
- Key Laboratory of Yunnan Higher Education Institutes for Optoelectronic Information and Technology, Kunming, 650500 People’s Republic of China
- Institute of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500 People’s Republic of China
| | - Yuemei Wu
- Key Laboratory of Yunnan Higher Education Institutes for Optoelectronic Information and Technology, Kunming, 650500 People’s Republic of China
- Institute of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500 People’s Republic of China
| | - Dapeng Yu
- Institute of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500 People’s Republic of China
- Department of Physics, State Key Laboratory for Mesoscopic Physics, Peking University, Beijing, 100871 People’s Republic of China
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Gu X, Li C, Yuan S, Ma M, Qiang Y, Zhu J. ZnO based heterojunctions and their application in environmental photocatalysis. NANOTECHNOLOGY 2016; 27:402001. [PMID: 27575520 DOI: 10.1088/0957-4484/27/40/402001] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
As an alternative to TiO2 photocatalysts, ZnO exhibits a large potential for photocatalytic (PC) applications in environmental treatments, such as degradation of wastewater, sterilization of drinking water, and air cleaning. However, the efficiency achieved with ZnO to date is far from that expected for commercialization, due to rapid charge recombination, photo-corrosion as well as poor utilization of solar energy. Fortunately, in recent years, a great number of breakthroughs have been achieved in PC performance (including activity and stability) of micro-/nano- structured ZnO by forming heterojunctions (HJs) with metal nanoparticles (NPs), carbon nanostructures and other semiconductors. In most cases, the improvement of PC performance was ascribed to the better charge separation at the interfaces between ZnO and the other components. Sometimes, the formation of hybrids is also in favor of visible light harvesting. This review summarizes recent advances in the fields of environmental photocatalysis by ZnO based HJs, and especially emphasizes their abilities in degradation of organic pollutants or harmful substances in water. We aim to reveal the mechanism underlying the enhanced PC performance by constructing HJs, and extend the potential of ZnO HJ photocatalysts for future trends, and practical, large-scale applications in environment-related fields.
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Affiliation(s)
- Xiuquan Gu
- Department of Chemistry-Ångström Laboratory, Uppsala University, 75121 Uppsala, Sweden. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, People's Republic of China
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Nikam L, Panmand R, Kadam S, Naik S, Kale B. Enhanced hydrogen production under a visible light source and dye degradation under natural sunlight using nanostructured doped zinc orthotitanates. NEW J CHEM 2015. [DOI: 10.1039/c4nj01995d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanostructured zinc orthotitanates were successfully employed as solar light driven photocatalysts for waste degradation such as H2S which produces H2, a clean energy source, and dye degradation.
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Affiliation(s)
- Latesh Nikam
- Centre for Materials for Electronics Technology (C-MET)
- Department of Electronics and Information Technology (DeitY)
- Pune
- India
- Baburaoji Gholap College
| | - Rajendra Panmand
- Centre for Materials for Electronics Technology (C-MET)
- Department of Electronics and Information Technology (DeitY)
- Pune
- India
| | - Sunil Kadam
- Centre for Materials for Electronics Technology (C-MET)
- Department of Electronics and Information Technology (DeitY)
- Pune
- India
| | - Sonali Naik
- Centre for Materials for Electronics Technology (C-MET)
- Department of Electronics and Information Technology (DeitY)
- Pune
- India
| | - Bharat Kale
- Centre for Materials for Electronics Technology (C-MET)
- Department of Electronics and Information Technology (DeitY)
- Pune
- India
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Liang YC, Liao WK. Annealing induced solid-state structure dependent performance of ultraviolet photodetectors made from binary oxide-based nanocomposites. RSC Adv 2014. [DOI: 10.1039/c4ra01205d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Zhang P, Shao C, Zhang M, Guo Z, Mu J, Zhang Z, Zhang X, Liang P, Liu Y. Controllable synthesis of Zn2TiO4@carbon core/shell nanofibers with high photocatalytic performance. JOURNAL OF HAZARDOUS MATERIALS 2012; 229-230:265-72. [PMID: 22727394 DOI: 10.1016/j.jhazmat.2012.05.102] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Revised: 05/29/2012] [Accepted: 05/30/2012] [Indexed: 05/23/2023]
Abstract
Zn(2)TiO(4)@carbon core/shell nanofibers (Zn(2)TiO(4)@C NFs) with different thickness of carbon layers (from 2 to 8 nm) were fabricated by combining the electrospinning technique and hydrothermal method. The results showed that a uniform carbon layer was formed around the electrospun Zn(2)TiO(4) nanofiber (Zn(2)TiO(4) NFs). By adjusting the hydrothermal fabrication parameters, the thickness of carbon layer varied linearly with the concentration of glucose. Furthermore, the core/shell structure formed between Zn(2)TiO(4) and carbon enhanced the charge separation of pure Zn(2)TiO(4) under ultraviolet excitation, as evidenced by photoluminescence spectra. The photocatalytic studies revealed that the Zn(2)TiO(4)@C NFs exhibited enhanced photocatalytic efficiency of photodegradation of Rhodamine B (RB) compared with the pure Zn(2)TiO(4) NFs under ultraviolet excitation, which might be attributed to the high separation efficiency of photogenerated electrons and holes based on the synergistic effect between carbon and Zn(2)TiO(4). Notably, the Zn(2)TiO(4)@C NFs could be recycled easily by sedimentation without a decrease of the photocatalytic activity.
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Affiliation(s)
- Peng Zhang
- Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, PR China
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11
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Liang YC, Hu CY, Liang YC. Crystallographic phase evolution of ternary Zn–Ti–O nanomaterials during high-temperature annealing of ZnO–TiO2 nanocomposites. CrystEngComm 2012. [DOI: 10.1039/c2ce25347j] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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