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Li X, Qu Y, Xu J, Liang J, Chen H, Chen D, Bai L. 2D/2D Biochar/Bi 2WO 6 Hybrid Nanosheets with Enhanced Visible-Light-Driven Photocatalytic Activities for Organic Pollutants Degradation. ACS OMEGA 2023; 8:26882-26894. [PMID: 37546663 PMCID: PMC10398710 DOI: 10.1021/acsomega.3c01591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 07/12/2023] [Indexed: 08/08/2023]
Abstract
In this work, a novel two-dimensional/two-dimensional (2D/2D) hybrid photocatalyst consisting of Bi2WO6 (BWO) nanosheets and cotton fibers biochar (CFB) nanosheets was successfully prepared via a facile hydrothermal process. The as-prepared photocatalysts were characterized by a variety of techniques, including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy. It was revealed that amorphous CFB nanosheets were uniformly immobilized on the surface of crystalline BWO nanosheets, and an intimate contact between CFB and BWO was constructed. The photocatalytic activities of the prepared BWO and CFB-BWO photocatalysts were evaluated by photocatalytic degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC-HCl) in aqueous solutions under visible-light irradiation. Compared to the pristine BWO, the CFB-BWO composite photocatalysts exhibited significant enhancement in photocatalytic activities. Among all CFB-BWO samples, the 9CFB-BWO sample with the CFB mass ratio of 9% exhibited optimal photocatalytic activities for RhB or TC-HCl degradation, which was ca. 1.8 times or 2.4 times that of the pristine BWO, respectively. The improvement in photocatalytic activities of the CFB-BWO photocatalysts could be ascribed to the enhanced migration and separation of photogenerated charge carriers due to the formation of a 2D/2D interfacial heterostructure between CFB and BWO. Meanwhile, the possible mechanism of CFB-BWO for enhanced photocatalytic performance was also discussed. This work may provide a new approach to designing and developing novel BWO-based photocatalysts for the highly efficient removal of organic pollutants.
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Affiliation(s)
- Xiaolin Li
- College
of Chemistry and Materials Engineering, Zhejiang Agriculture and Forestry University, Hangzhou, Zhejiang Province 311300, China
| | - Yanan Qu
- College
of Chemistry and Materials Engineering, Zhejiang Agriculture and Forestry University, Hangzhou, Zhejiang Province 311300, China
| | - Junjie Xu
- College
of Chemistry and Materials Engineering, Zhejiang Agriculture and Forestry University, Hangzhou, Zhejiang Province 311300, China
| | - Junhui Liang
- College
of Materials and Chemistry, China Jiliang
University, Hangzhou, Zhejiang 310018, China
| | - Huayu Chen
- College
of Materials and Chemistry, China Jiliang
University, Hangzhou, Zhejiang 310018, China
| | - Da Chen
- College
of Materials and Chemistry, China Jiliang
University, Hangzhou, Zhejiang 310018, China
| | - Liqun Bai
- College
of Chemistry and Materials Engineering, Zhejiang Agriculture and Forestry University, Hangzhou, Zhejiang Province 311300, China
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Bathula B, Eadi SB, Lee HD, Yoo K. ZnWO 4 nanorod-colloidal SnO 2 quantum dots core@shell heterostructures: Efficient solar-light-driven photocatalytic degradation of tetracycline. ENVIRONMENTAL RESEARCH 2023; 228:115851. [PMID: 37062476 DOI: 10.1016/j.envres.2023.115851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 03/30/2023] [Accepted: 04/03/2023] [Indexed: 05/16/2023]
Abstract
Zinc tungsten oxide (ZW) and colloidal SnO2 quantum dots (CS) were synthesized individually by hydrothermal and wet chemical methods. ZW-CS core@shell nanorods were prepared using a sonochemical method for the enhanced photocatalytic activity of tetracycline (TC) degradation. ZW-CS core@shell nanorods were systematically characterized by structural, morphological mapping and optical techniques. All characterization techniques were synchronized to confirm the construction of core@shell nanorods. Optical absorption studies indicate an increased light-capturing efficiency along with a reduced bandgap from 3.56 to 3.23 eV, which is further supported by photoluminescence. Mapping analysis from SEM and HR-TEM evidence the presence of elements as well as a core@shell nanostructure. The optimized sample of ZW-CS 1.0 shows improved photocatalytic degradation of TC under stimulated solar light. The TC degradation efficiency by ZW-CS 1.0 core@shell nanorods was about 97% within 2 h. The formation of core@shell nanorod structure might be the reason for the better photocatalytic tetracycline degradation performance.
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Affiliation(s)
- Babu Bathula
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, 38541, South Korea
| | - Sunil Babu Eadi
- Department of Electronics Engineering, Chungnam National University, Daejeon, South Korea.
| | - Hi-Deok Lee
- Department of Electronics Engineering, Chungnam National University, Daejeon, South Korea.
| | - Kisoo Yoo
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, 38541, South Korea.
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Costa IGF, Ribeiro SRFL, Nascimento LL, Patrocinio AOT, Cardoso VL, Batista FRX, Reis MHM. Well-dispersed titanium dioxide and silver nanoparticles on external and internal surfaces of asymmetric alumina hollow fibers for enhanced chromium (VI) photoreductions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:62508-62521. [PMID: 36944834 DOI: 10.1007/s11356-023-26528-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 03/14/2023] [Indexed: 05/10/2023]
Abstract
Heterogenous photocatalysis is a suitable alternative for wastewater treatment. The supporting of the solid catalyst in a porous material is suggested to facilitate catalyst recovery and reuse. Here we propose for the first time the evaluation of supporting silver (Ag)-decorated titanium dioxide (TiO2) catalysts on internal and external surfaces of alumina hollow fibers with asymmetric pore size distribution. The produced catalysts were considered for Cr(VI) photoreductions. The ultrasound-assisted process potentialized the distribution of Ag nanoparticles on the TiO2 surface. The loading of Ag nanoparticles at concentrations greater than 5 wt% was necessary to improve the TiO2 activity for Cr(VI) photoreduction. The loading of Ag nanoparticles at 30 wt% improved the Cr(VI) photoreduction of the single TiO2 catalyst from 40.49 ± 0.98 to 55.00 ± 0.83% after 180 min of reaction. Suspended and supported Ag-decorated TiO2 catalysts achieved total Cr(VI) photoreduction after 21 h of reaction. The adjusted reaction rate constant with the externally supported Ag-TiO2 catalyst was 3.57 × 10-3 ± 0.18 × 10-3 min-1. Similar reaction rate constants were achieved with suspended and internally supported catalysts (approximately 2.70 × 10-3 min-1). After 10 sequential reuses, all catalysts presented similar Cr(VI) photoreductions of approximately 66%. Nevertheless, the use of the externally supported catalyst is suggested for Cr(VI) photoreductions due to its superior catalyst activity at least in the first reuse cycles.
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Affiliation(s)
- Igor G F Costa
- Chemical Engineering Faculty, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, Santa Mônica, Uberlândia, MG, 38400-902, Brazil
| | - Stella R F L Ribeiro
- Chemical Engineering Faculty, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, Santa Mônica, Uberlândia, MG, 38400-902, Brazil
| | - Lucas L Nascimento
- Laboratory of Photochemistry and Materials Science (LAFOT-CM), Institute of Chemistry, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, Santa Mônica, Uberlândia, MG, 38400-902, Brazil
| | - Antonio Otavio T Patrocinio
- Laboratory of Photochemistry and Materials Science (LAFOT-CM), Institute of Chemistry, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, Santa Mônica, Uberlândia, MG, 38400-902, Brazil
| | - Vicelma L Cardoso
- Chemical Engineering Faculty, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, Santa Mônica, Uberlândia, MG, 38400-902, Brazil
| | - Fabiana R X Batista
- Chemical Engineering Faculty, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, Santa Mônica, Uberlândia, MG, 38400-902, Brazil
| | - Miria H M Reis
- Chemical Engineering Faculty, Universidade Federal de Uberlândia, Av. João Naves de Ávila 2121, Santa Mônica, Uberlândia, MG, 38400-902, Brazil.
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Zhu X, Qin F, He L, Jiao Y, Feng W. Enhanced Photocatalytic Activity of Anatase/Rutile Heterojunctions by Lanthanum and Tin Co-Doping. Int J Mol Sci 2022; 23:11339. [PMID: 36232637 PMCID: PMC9569733 DOI: 10.3390/ijms231911339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 09/11/2022] [Accepted: 09/20/2022] [Indexed: 11/17/2022] Open
Abstract
Anatase/rutile heterojunctions were prepared using the sol-gel method and modified by La/Sn single doping and co-doping. Sn doping promoted the transformation from anatase to rutile, while La doping inhibited the phase transformation. La and Sn co-doping showed an inhibitory effect. The co-doping of La and Sn did not increase visible-light absorption, but exhibited a synergistic effect on inhibiting the recombination of photogenerated electrons and holes, which improved the photocatalytic activity on the basis of single-element modification. The first-order reaction rate constant of La/Sn co-doped sample was 0.027 min-1, which is 1.8 times higher than that of pure TiO2 (0.015 min-1). Meanwhile, the mechanism of photodegradation of methylene blue (MB) by La/Sn co-doped anatase/rutile heterojunctions was discussed through electrochemical measurements and free-radical trapping experiments.
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Affiliation(s)
- Xiaodong Zhu
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Fengqiu Qin
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Lili He
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
| | - Yu Jiao
- School of Science, Xichang University, Xichang 615013, China
| | - Wei Feng
- School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
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