1
|
Xiong T, Feng Q, Fang C, Chen R, Wang Y, Xu L, Liu C. A novel ZnCo 2O 4/BiOBr p-n/Z-scheme heterojunction photocatalyst for enhancing photocatalytic activity. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:26839-26854. [PMID: 38456981 DOI: 10.1007/s11356-024-32762-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 02/29/2024] [Indexed: 03/09/2024]
Abstract
In this study, we developed a novel p-n/Z-scheme heterojunction photocatalyst, ZnCo2O4/BiOBr (ZCo/BB), through a straightforward and safe hydrothermal-calcination-solvent thermal method. The composite photocatalyst demonstrated exceptional photocatalytic efficacy, particularly when the mass ratio of ZnCo2O4 was 25% (referred to as 25% ZCo/BB). Structural characterization and electrochemical analysis revealed that 25% ZCo/BB exhibited a larger specific surface area and a faster electron transfer rate. Under visible light exposure for 30 min, methylene blue (MB) degradation reached 92%, and the reaction rate constants were 8.2 and 3.7 times higher than those observed for individual ZnCo2O4 and BiOBr, respectively. Furthermore, the 25% ZCo/BB demonstrated exceptional photocatalytic stability over four cycles, maintaining over 80% MB degradation after each cycle. The outstanding photocatalytic activity was attributed to the p-n/Z-scheme heterojunction construction, which promoted charge separation and inhibited carrier recombination. In addition, ·OH and h+ were the major active species in photocatalysis, and · O 2 - was identified as a secondary active species. This work presents an efficient heterojunction photocatalyst for the degradation of organic wastewater.
Collapse
Affiliation(s)
- Tao Xiong
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, People's Republic of China
| | - Qi Feng
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China
| | - Cimei Fang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, People's Republic of China
| | - Rui Chen
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, People's Republic of China
| | - Yanxi Wang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, People's Republic of China
| | - Longjun Xu
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China
| | - Chenglun Liu
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, People's Republic of China.
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, People's Republic of China.
| |
Collapse
|
2
|
Naga Lakshmi C, Irfan M, Sinha R, Singh N. Magnetically recoverable Ni-doped iron oxide/graphitic carbon nitride nanocomposites for the improved photocatalytic degradation of ciprofloxacin: Investigation of degradation pathways. ENVIRONMENTAL RESEARCH 2024; 242:117812. [PMID: 38042517 DOI: 10.1016/j.envres.2023.117812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Revised: 11/12/2023] [Accepted: 11/27/2023] [Indexed: 12/04/2023]
Abstract
Developing efficient and effective photocatalysts is essential for organic dyes and antibiotic degradation in wastewater. Ni-doped α-Fe2O3/g-C3N4 (NFGCN) photocatalysts were synthesised through a simple co-precipitation technique and used for the ciprofloxacin (CIP) and methylene blue (MB) degradation through photocatalysis. The XRD data indicated the crystallinity of the synthesised iron oxide and its composites with rhombohedral structures with the nature of high purity. The morphology of the NFGCN composite revealed the construction of Ni-doped α-Fe2O3 (NFO) nanoparticles onto the g-C3N4 (GCN) sheet surface along with the close interface that induced a Z-scheme heterojunction. The synthesised photocatalysts showed photocatalytic activity with good degradation efficiency of 82.1 % and 92.0 % for CIP and MB, respectively, within 120 min under solar light exposure. The improved photocatalytic degradation efficiency was attained owing to the synthesised composite's enhanced light absorption in the visible range. The narrow band gap energies and interaction between Ni-doped α-Fe2O3 and g-C3N4 displayed by these materials result in enhanced visible light absorption, effective charge carrier separation and transportation to the pollutants. CIP degradation pathways were investigated utilising the LC-MS analysis. NFGCN composites showed good recyclability (5 cycles), magnetic retrievability, and stability for degrading organic and emerging pollutants from wastewater through photocatalysis.
Collapse
Affiliation(s)
- Chinthalapudi Naga Lakshmi
- Department of Chemical Engineering, Indian Institute of Technology Tirupati, Tirupati, Andhra Pradesh, 517619, India
| | - Mohammad Irfan
- Department of Chemical Engineering, Indian Institute of Technology Tirupati, Tirupati, Andhra Pradesh, 517619, India
| | - Rahul Sinha
- Department of Chemical Engineering, Indian Institute of Technology Tirupati, Tirupati, Andhra Pradesh, 517619, India
| | - Narendra Singh
- Department of Chemical Engineering, Indian Institute of Technology Tirupati, Tirupati, Andhra Pradesh, 517619, India.
| |
Collapse
|
3
|
Ma Z, Li X, Fan G, Deng L, He Y. Construction of 3D sheet-packed hierarchical MoS 2/BiOBr heterostructures with remarkably enhanced photocatalytic performance for tetracycline and levofloxacin degradation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:59737-59748. [PMID: 37016255 DOI: 10.1007/s11356-023-26740-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 03/27/2023] [Indexed: 05/10/2023]
Abstract
In this paper, MoS2 nanosheets were prepared and deposited on BiOBr microflowers through deposition-hydrothermal strategy. MoS2 exhibited a string of nanosheets with wrinkled layer outlook, and MoS2/BiOBr composites displayed a micro-flower morphology with the diameter of 2-3 μm. Visible-light harvesting performance was significantly improved in the region of 400-600 nm for MoS2/BiOBr. The obtained MoS2/BiOBr samples exhibited tremendous enhanced catalytic activity, which could degrade 92.96% of tetracycline and 90.31% of levofloxacin within 70 min. The photo-generated holes and ⋅OH radicals played the dominant roles in the whole photocatalytic decomposition process. Based on the analysis of DRS, BET, PL, and electrochemical results, the remarkably improved photocatalytic performance may be ascribed to the synergistic effect of strong visible-light harvesting ability, enhanced BET surface area, and faster separation or transfer efficiency of photo-generated charges.
Collapse
Affiliation(s)
- Zhanying Ma
- Department of Chemistry, Xianyang Normal University, Xianyang, 712000, China
| | - Xiaobo Li
- Department of Chemistry, Xianyang Normal University, Xianyang, 712000, China
| | - Guang Fan
- Department of Chemistry, Xianyang Normal University, Xianyang, 712000, China
| | - Lingjuan Deng
- Department of Chemistry, Xianyang Normal University, Xianyang, 712000, China
| | - Yangqing He
- Department of Applied Chemistry, Xi'an University of Technology, Xi'an, 710048, China.
| |
Collapse
|
4
|
Sreeram N, Aruna V, Koutavarapu R, Lee DY, Rao MC, Shim J. Fabrication of InVO 4/SnWO 4 heterostructured photocatalyst for efficient photocatalytic degradation of tetracycline under visible light. ENVIRONMENTAL RESEARCH 2023; 220:115191. [PMID: 36587724 DOI: 10.1016/j.envres.2022.115191] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 12/13/2022] [Accepted: 12/28/2022] [Indexed: 06/17/2023]
Abstract
In the present study, novel InVO4/SnWO4 nanocomposites with different concentrations of SnWO4 were successfully prepared using a facile hydrothermal technique and investigated employing a wide range of analytical methods for efficient photocatalytic degradation of tetracycline (TC). X-ray diffraction analysis showed the presence of the orthorhombic phases of both InVO4 and SnWO4 in the composite catalyst. Dispersion of SnWO4 nanoplates over the InVO4 nanosheets enhanced the synergistic interactions, improving the separation of charge carriers and their transfer. Furthermore, the formation of heterostructure expanded the absorption range and promoted visible light harvesting. The TC degradation efficiency of InVO4/SnWO4 nanocomposite (5 mg loading of SnWO4) reached 97.13% in 80 min under visible light, with the kinetic rate constants 5.51 and 7.63 times greater than those of pure InVO4 and SnWO4, respectively. Additionally, the scavenger results proved that hydroxyl radicals and holes played a significant role in the photodegradation of TC. Furthermore, the electrochemical impedance spectroscopy (EIS) and transient photocurrent response analysis showed enhanced e-/h+ partition efficiency. Thus, the formation of heterostructure with strong synergistic interactions can effectively transfer the excited charge carriers and shorten the reunion rate. Accordingly, the InVO4/SnWO4 nanocomposites exhibited remarkable photocatalytic performance due to the increased number of charge carriers on the surface.
Collapse
Affiliation(s)
- N Sreeram
- Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur 522 510, Andhra Pradesh, India
| | - V Aruna
- Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur 522 510, Andhra Pradesh, India; Department of Physics, Bapatla Engineering College, Bapatla 522 102, Andhra Pradesh, India.
| | - Ravindranadh Koutavarapu
- Department of Robotics Engineering, College of Mechanical and IT Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
| | - Dong-Yeon Lee
- Department of Robotics Engineering, College of Mechanical and IT Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
| | - M C Rao
- Department of Physics, Andhra Loyola College, Vijayawada 520008, Andhra Pradesh, India.
| | - Jaesool Shim
- School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
| |
Collapse
|
5
|
Liu J, Yang L, Li C, Chen Y, Zhang Z. Optimal monolayer WO3 nanosheets/TiO2 heterostructure and its photocatalytic performance under solar light. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
6
|
Zhao J, Tian W, Chu M, Chen H, Yang S, Jiang J. Enhanced photodegradation of methyl and parent PAH over flower-sphere Ag/rGO/BiOBr composite: Performance, mechanism and pathway. CHEMOSPHERE 2022; 297:134175. [PMID: 35271896 DOI: 10.1016/j.chemosphere.2022.134175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 02/13/2022] [Accepted: 02/28/2022] [Indexed: 06/14/2023]
Abstract
Significant amounts of methyl and parent polycyclic aromatic hydrocarbons (PAHs) exist in the environment, causing a potential environmental threat. A cost-effective, stable, and efficient photocatalyst was valuable for water remediation. In this work, Ag and reduced graphene oxide (rGO) was used to promote the visible light utilization of BiOBr catalyst. The photocatalytic degradation performance of synthesized catalysts under sunlight irradiation was better than under visible light irradiation. The Ag/rGO/BiOBr catalyst was superior to pure BiOBr and Ag/BiOBr in the photodegradation of 3,6-dimethylphenanthrene (3,6-DMP) and phenanthrene (Phe) with the optimum doping amounts (Ag 1.5 wt% and rGO 3 wt%). The degradation of 3,6-DMP on 1.5Ag/3rGO/BiOBr was influenced by solution pH, catalyst dosage and humic acid adding. 3,6-DMP was more easily photodegraded than Phe. Superoxide radicals (·O2-) and holes (h+) played key roles in the photocatalytic process. The photodegradation mechanisms and pathways of 3,6-DMP and Phe were proposed according to the intermediate detection results by GC-MS. Ag/rGO/BiOBr provided a promising solution for methyl and parent PAH remediation.
Collapse
Affiliation(s)
- Jing Zhao
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, PR China
| | - Weijun Tian
- Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao, 266100, PR China; College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, PR China.
| | - Meile Chu
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, PR China
| | - Haining Chen
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, PR China
| | - Shujie Yang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, PR China
| | - Junfeng Jiang
- College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, PR China
| |
Collapse
|
7
|
Tian Y, Zhang J, Wang W, Liu J, Zheng X, Li J, Guan X. Facile assembly and excellent elimination behavior of porous BiOBr-g-C 3N 4 heterojunctions for organic pollutants. ENVIRONMENTAL RESEARCH 2022; 209:112889. [PMID: 35131321 DOI: 10.1016/j.envres.2022.112889] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 01/29/2022] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
Photocatalysis can be an effective technique for eliminating organic contaminants from water. In this study, BiOBr flower-spheres coupled with porous graphite carbon nitride (g-C3N4) were synthesized by controlling the dosage of cetyltrimethylammonium bromide (CTAB). Various characterization techniques were then applied to elucidate the structure-performance relationships of the resulting heterojunction photocatalysts in degrading organic dyes. Experimental results established an optimal molar ratio for KBr to CTAB of 5:1. Benefiting from a remarkable porous structure and tight coupling between porous g-C3N4 and BiOBr, the optimal BiOBr-g-C3N4(2%) exhibited enhanced visible light absorption capability and promoted the separation of photoinduced carriers. Total removal efficiency for rhodamine B (RhB, 25.0 mL, 20.0 mg L-1) reached 87% within 30 min in the presence of BiOBr-g-C3N4(2%) (20.0 mg) (i.e., 1.51 μmol (gphotocatalyst min)-1), which is superior to the performance of BiOBr (72%) (i.e., 1.25 μmol (gphotocatalyst min)-1), g-C3N4 (21%) (i.e., 0.37 μmol (gphotocatalyst min)-1). Furthermore, the photocatalytic reaction rate constant over the optimal heterojunction was 0.034 min-1, which is significantly larger than those of porous g-C3N4 (0.003 min-1) and BiOBr (0.015 min-1). Moreover, this type II heterojunction showed good universality for other organic dyes (such as methyl violet, methylene blue, and crystal violet), highlighting a promising potential role in the elimination of environmental pollutants.
Collapse
Affiliation(s)
- Yanan Tian
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Junyang Zhang
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Wanyi Wang
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Jianhui Liu
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Xiucheng Zheng
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.
| | - Jun Li
- Henan Institutes of Advanced Technology, Zhengzhou University, Zhengzhou, 450003, China.
| | - Xinxin Guan
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.
| |
Collapse
|
8
|
Kappadan S, Thomas S, Kalarikkal N. Enhanced photocatalytic performance of BaTiO3/g-C3N4 heterojunction for the degradation of organic pollutants. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138513] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
9
|
Baral A, Dhara A, Sinha A, Mukherjee N. Chemically synthesized Sb 2S 3 hollow-spheres for significantly fast and reliable visible light driven dye photodegradation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 250:119368. [PMID: 33406451 DOI: 10.1016/j.saa.2020.119368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 11/25/2020] [Accepted: 12/18/2020] [Indexed: 06/12/2023]
Abstract
Sb2S3 hollow-spheres in powder form were synthesized through a facile chemical route. The synthesized material was found to have notably high specific surface area. After annealing it showed broadband absorption of light within the visible region. The valance band and conduction band of the synthesized semiconductor were also positioned appropriately (w.r.t NHE) so that the required redox reactions with water in presence of the photogenerated excitons are facilitated. These factors make it a suitable candidate for photocatalytic applications towards the degradation of dye based water pollutants. The synthesized material was established through systematic structural, compositional and optical characterizations. The photocatalytic efficacy toward the degradation of cationic, anionic and neutral dyes has been studied and the best degradation efficiency of 99.72% within 20 min has been achieved at a rate of 0.2920/min, which is significantly higher than many previous reports. Reusability, one of the major factors for the practical application of a catalyst, has also been studied in detail by investigating the probable changes in structural properties as well as in performance after several cycles of photodegradation. The reliability studies yielded encouraging results even after 50th cycle of photodegradation. The effect of catalyst loading on the photodegradation efficacy has also been studied.
Collapse
Affiliation(s)
- Apurba Baral
- Centre of Excellence for Green Energy and Sensor Systems, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India; Dr. M. N. Dastur School of Materials Science and Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India
| | - Arnab Dhara
- Dr. M. N. Dastur School of Materials Science and Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India
| | - Arijit Sinha
- Dr. M. N. Dastur School of Materials Science and Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India
| | - Nillohit Mukherjee
- Centre of Excellence for Green Energy and Sensor Systems, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, West Bengal, India.
| |
Collapse
|
10
|
Yang X, Chen Z, Zhao W, Liu C, Qian X, Zhang M, Wei G, Khan E, Hau Ng Y, Sik Ok Y. Recent advances in photodegradation of antibiotic residues in water. CHEMICAL ENGINEERING JOURNAL (LAUSANNE, SWITZERLAND : 1996) 2021; 405:126806. [PMID: 32904764 PMCID: PMC7457966 DOI: 10.1016/j.cej.2020.126806] [Citation(s) in RCA: 107] [Impact Index Per Article: 35.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/11/2020] [Accepted: 08/24/2020] [Indexed: 05/21/2023]
Abstract
Antibiotics are widely present in the environment due to their extensive and long-term use in modern medicine. The presence and dispersal of these compounds in the environment lead to the dissemination of antibiotic residues, thereby seriously threatening human and ecosystem health. Thus, the effective management of antibiotic residues in water and the practical applications of the management methods are long-term matters of contention among academics. Particularly, photocatalysis has attracted extensive interest as it enables the treatment of antibiotic residues in an eco-friendly manner. Considerable progress has been achieved in the implementation of photocatalytic treatment of antibiotic residues in the past few years. Therefore, this review provides a comprehensive overview of the recent developments on this important topic. This review primarily focuses on the application of photocatalysis as a promising solution for the efficient decomposition of antibiotic residues in water. Particular emphasis was laid on improvement and modification strategies, such as augmented light harvesting, improved charge separation, and strengthened interface interaction, all of which enable the design of powerful photocatalysts to enhance the photocatalytic removal of antibiotics.
Collapse
Affiliation(s)
- Xiuru Yang
- College of Materials and Chemistry, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education Zone Hangzhou, 310018, China
| | - Zhi Chen
- College of Materials and Chemistry, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education Zone Hangzhou, 310018, China
| | - Wan Zhao
- College of Materials and Chemistry, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education Zone Hangzhou, 310018, China
| | - Chunxi Liu
- College of Materials and Chemistry, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education Zone Hangzhou, 310018, China
| | - Xiaoxiao Qian
- College of Materials and Chemistry, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education Zone Hangzhou, 310018, China
| | - Ming Zhang
- Department of Environmental Engineering, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education Zone Hangzhou, 310018, China
| | - Guoying Wei
- College of Materials and Chemistry, China Jiliang University, 258 Xueyuan Street, Xiasha Higher Education Zone Hangzhou, 310018, China
| | - Eakalak Khan
- Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, NV 89154, USA
| | - Yun Hau Ng
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Special Administrative Region, China
| | - Yong Sik Ok
- Korea Biochar Research Center, APRU Sustainable Waste Management & Division of Environmental Science and Ecological Engineering, Korea University, Seoul, South Korea
| |
Collapse
|
11
|
Wang Y, Jiang W, Yao W, Liu Z, Liu Z, Wang Y, Shi L, Gao L. BiNV bond: A hole-transfer bridge for high-efficient separation and transfer of carriers. J Colloid Interface Sci 2021; 590:144-153. [PMID: 33524715 DOI: 10.1016/j.jcis.2021.01.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 01/12/2021] [Accepted: 01/16/2021] [Indexed: 11/28/2022]
Abstract
Addressing the inherent holes transport limitation of BiVO4 photoanode is crucial to achieve efficient photoelectrochemical (PEC) water splitting. The construction of the hole-transfer bridge between co-catalysts and BiVO4 photoanode could be an effective way to overcome sluggish hole-transfer kinetics of BiVO4 photoanode. Herein, CxNy/BiVO4 photoanode was prepared by coupling carbon nitride hydrogel (CNH) containing unsaturated N on the BiVO4 photoanode during annealing. CxNy/BiVO4 photoanode exhibited excellent PEC performance and stability. Photoelectrochemical tests proved that the coupling of CxNy accelerated holes transfer and enhanced oxygen evolution kinetics. X-ray photoelectron spectroscopy (XPS) and theoretical calculations confirmed the existence of the BiNV bond between BiVO4 photoanode and CxNy, which could serve as the hole-transfer bridge to significantly accelerate separation and transfer of carriers driven by the interfacial electric field. Moreover, it was found that the coupling of CxNy effectively inhibited the dissociation of metal ions through changing their coordination environment, resulting in the excellent stability of CxNy/BiVO4 photoanode. This result provides unique insights into vital roles of the interfacial structure, which might have a significant impact on the construction of PEC devices.
Collapse
Affiliation(s)
- Yuhong Wang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China; Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, 104 Youyi Road, Beijing 100094, PR China
| | - Wenjun Jiang
- Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, 104 Youyi Road, Beijing 100094, PR China.
| | - Wei Yao
- Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, 104 Youyi Road, Beijing 100094, PR China
| | - Zailun Liu
- Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, 104 Youyi Road, Beijing 100094, PR China; School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, PR China
| | - Zhe Liu
- Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, 104 Youyi Road, Beijing 100094, PR China; School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, PR China
| | - Yajun Wang
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China
| | - Lijie Shi
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China
| | - Lizhen Gao
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China; School of Mechanical Engineering, University of Western Australia, 35 Stirling Highway, WA 6009, Australia.
| |
Collapse
|
12
|
Chowdhury AP, Shambharkar BH. Fabrication and characterization of BiOBr-SnWO4 heterojunction nanocomposites with boosted photodegradation capability. CHEMICAL ENGINEERING JOURNAL ADVANCES 2020. [DOI: 10.1016/j.ceja.2020.100040] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
|
13
|
Zhen Y, Yang C, Shen H, Xue W, Gu C, Feng J, Zhang Y, Fu F, Liang Y. Photocatalytic performance and mechanism insights of a S-scheme g-C 3N 4/Bi 2MoO 6 heterostructure in phenol degradation and hydrogen evolution reactions under visible light. Phys Chem Chem Phys 2020; 22:26278-26288. [PMID: 33174550 DOI: 10.1039/d0cp02199g] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Photocatalysis with potentially low cost and sustainable utilization is a typically environmentally benign method for the degradation of organic pollutants, but the rational design and fabrication of photocatalysts with high catalytic performance is still an enormous challenge. The efficient segregation of photogenerated electron-hole pairs in photocatalysts is a key and essential factor to decide photocatalytic activity. Herein, a novel Step-scheme (S-scheme) heterojunction photocatalyst, a g-C3N4/Bi2MoO6 (g-CN/BMO) composite, was successfully fabricated using g-C3N4 nanosheet-wrapped Bi2MoO6 microspheres. By adjusting the amount of g-C3N4 in BMO, a series of g-CN/BMO composites was prepared while optimizing posttreatment temperature. The resulting g-CN/BMO indicated well the photocatalytic performance for the degradation of phenol and hydrogen evolution reactions, especially, 100 g of g-CN was integrated into 100 g of the pre-calcined BMO at 200 °C to produce 100% g-CN/BMO-200, showing the highest photocatalytic performance compared to single composite BMO, BMO-200, g-CN, and g-CN/BMO-200 with other mass ratios. Combining the results from the density functional theory calculations and the results of X-ray photoelectron spectroscopy, for S-scheme heterojunction-structured g-CN/BMO-200, the internal electric field-, band edge bending- and coulomb interaction-driven efficient segregation of photogenerated electrons and holes at the interface is elucidated to explain the photocatalytic mechanism, and the resulting holes on the VB of BMO and electrons on the CB of g-CN are responsible for the improvement of the photocatalytic performance. This study revealed that for the S-scheme g-CN/BMO composite the internal electric field, band edge bending and coulomb interaction at the interface between g-CN and BMO can not only promote the effective segregation of electrons and holes, but also retain stronger redox ability. Such an investigation provides a facile and simple strategy to fabricate novel S-scheme heterojunction-structured photocatalysts for solar energy conversion.
Collapse
Affiliation(s)
- Yanzhong Zhen
- College of Chemistry & Chemical Engineering, Yan'an University, Yan'an 716000, P. R. China.
| | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Abstract
The use of sunlight for photocatalytic oxidation is an ideal strategy, but it is limited by factors such as insufficient light absorption intensity of the photocatalyst and easy recombination of photogenerated electron holes. TiO2 is favored by researchers as an environment-friendly catalyst. In this paper, TiO2 is combined with WO3 to obtain a nanofiber with excellent catalytic performance under sunlight. The WO3/TiO2 composite nanofibers were synthesized by using the electrospinning method. The X-ray diffraction (XRD) analysis indicated that WO3 was successfully integrated onto the surface of TiO2. The photodegradation performance and photocurrent analysis of the prepared nanofibers showed that the addition of WO3 really improved the photocatalytic performance of TiO2 nanofibers, methylene blue (MB) degradation rate increased from 72% to 96%, and 5% was the optimal composite mole percentage of W to Ti. The scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectra (UV-Vis DRS), and Brunauer-Emmett-Teller (BET) analysis further characterized the properties of 5% WO3/TiO2 nanofibers. The H2 generation rate of 5% WO3/TiO2 nanofibers was 107.15 μmol·g−1·h−1, in comparison with that of TiO2 nanofibers (73.21 μmol·g−1·h−1) under the same condition. The 5% WO3/TiO2 produced ·OH under illumination, which played an important role in the MB degradation. Also, the enhanced photocatalytic mechanism was also proposed based on the detailed analysis of the band gap and the active species trapping experiment. The results indicated that the effective separation of Z-scheme photogenerated electron-hole pairs and transfer system constructed between TiO2 and WO3 endowed the excellent photocatalytic activity of 5% WO3/TiO2 nanofibers.
Collapse
|
15
|
Hou L, Niu Y, Yang F, Ge F, Yuan C. Facile Solvothermal Synthesis of Hollow BiOBr Submicrospheres with Enhanced Visible-Light-Responsive Photocatalytic Performance. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2020; 2020:3058621. [PMID: 32211209 PMCID: PMC7085378 DOI: 10.1155/2020/3058621] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Revised: 01/27/2020] [Accepted: 02/04/2020] [Indexed: 05/27/2023]
Abstract
In this work, hierarchical hollow BiOBr submicrospheres (HBSMs) were successfully prepared via a facile yet efficient solvothermal strategy. Remarkable effects of solvents upon the crystallinities, morphologies, and microstructures of the BiOBr products were systematically investigated, which revealed that the glycerol/isopropanol volumetric ratio played a significant role in the formation of hollow architecture. Accordingly, the underlying formation mechanism of the hollow submicrospheres was tentatively put forward here. Furthermore, the photocatalytic activities of the resulting HBSMs were evaluated in detail with photocatalytic degradation of the organic methyl orange under visible light irradiation. Encouragingly, the as-obtained HBSMs with striking recyclability demonstrated excellent visible-light-responsive photocatalytic performance, which benefits from their large surface area, effective visible light absorption, and unique hollow feature, highlighting their promising commercial application in waste water treatment.
Collapse
Affiliation(s)
- Linrui Hou
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China
| | - Yawei Niu
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China
| | - Fan Yang
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China
| | - Fengyue Ge
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China
| | - Changzhou Yuan
- School of Material Science and Engineering, University of Jinan, Jinan 250022, China
| |
Collapse
|
16
|
Hasan I, Khan RA, Alharbi W, Alharbi KH, Abu Khanjer M, Alslame A. Synthesis, characterization and photo-catalytic activity of guar-gum-g-aliginate@silver bionanocomposite material. RSC Adv 2020; 10:7898-7911. [PMID: 35686226 PMCID: PMC9128726 DOI: 10.1039/d0ra00163e] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 02/10/2020] [Indexed: 12/21/2022] Open
Abstract
The green mechanism for the synthesis of nanoparticles and their application to the wastewater treatment is of inordinate curiosity to the research community. Herein we outline a novel method for the synthesis of silver nanoparticles via a green route using alginate-guar gum blend (GG-Alg@Ag) and their application to degrade methylene blue (MB) dye. The synthesized material was characterized by FTIR, XRD, SEM-EDX, TEM, TGA-DTG, AFM, and UV-vis techniques. A combination of RSM and CCD was employed to compute the system and optimized values of various interacting parameters such as exposure time (120 min), pH (4.98), dye concentration (194 mg L−1), and catalyst dose (0.07 g) with a photodegradation capacity of 92.33% and desirability 1.0. The mechanism of degradation reaction was best elucidated by the pseudo-second-order model suggesting chemical deposition of MB on the GG-Alg@Ag surface through followed by the reduction mechanism in the occupancy of visible light. The optical studies indicated a value of 2.5 eV by Tauc's plot for bandgap energy (Eg) for GG-Alg@Ag bionanocomposite. The green mechanism for the synthesis of nanoparticles and their application to the wastewater treatment is of inordinate curiosity to the research community.![]()
Collapse
Affiliation(s)
- Imran Hasan
- Environmental Research Laboratory
- Department of Chemistry
- Chandigarh University
- Mohali
- India
| | - Rais Ahmad Khan
- Department of Chemistry
- College of Science
- King Saud University
- Riyadh-11451
- Kingdom of Saudi Arabia
| | - Walaa Alharbi
- Department of Chemistry
- Faculty of Science
- King Khalid University
- Abha
- Kingdom of Saudi Arabia
| | - Khadijah H. Alharbi
- Department of Chemistry
- Science and Arts College
- Rabigh Campus
- King Abdulaziz University
- Jeddah
| | - Maymonah Abu Khanjer
- Department of Chemistry
- College of Science
- King Saud University
- Riyadh-11451
- Kingdom of Saudi Arabia
| | - Ali Alslame
- Department of Chemistry
- College of Science
- King Saud University
- Riyadh-11451
- Kingdom of Saudi Arabia
| |
Collapse
|
17
|
Facile bottom-up preparation of Cl-doped porous g-C3N4 nanosheets for enhanced photocatalytic degradation of tetracycline under visible light. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.115770] [Citation(s) in RCA: 204] [Impact Index Per Article: 40.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|