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Rani A, Lal AS, Saravanan P. Bismuth niobate/g-C 3N 4 heterojunction for maximised visible light photocatalytic removal of Bisphenol A. CHEMOSPHERE 2024; 364:143198. [PMID: 39209037 DOI: 10.1016/j.chemosphere.2024.143198] [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: 07/09/2024] [Revised: 08/23/2024] [Accepted: 08/26/2024] [Indexed: 09/04/2024]
Abstract
The occurrence of xenobiotic pollutants in the aquatic environment troubling the present and future generation. Persistent Organic Pollutants (POPs) is one such class of xenobiotic that was dominant in that category. In the present paper, a competent visible light driven heterojunction photocatalyst combining Bismuth niobate and g-C3N4 was developed for the effective removal of Bisphenol A (BPA), a notable POP. Before constructing the heterostructure the calcination temperature for bismuth niobate synthesis was optimised for achieving most proficient photocatalysis. A phase change in the crystal structure of bismuth niobate was apparent. The Bi3NbO7 at 300-500 °C transformed to Bi5Nb3O15 at 600-700 °C and to orthorhombic BiNbO4 at 900 °C as the temperature was enhanced. With the increment in the temperature the light absorbance of the materials enhanced in UV and reduced in visible light. Thus, the bismuth niobate obtained by calcining at 500 °C demonstrated highest BPA removal under sunlight was chosen for heterojunction construction. After the heterojunction construction with g-C3N4 the crystal lattice strain was observed to be reduced for all composites, and a greater mobility of charge carriers was observed within the composite. The presence of either of the materials resulted in a different band structure and thus Type II and Z-scheme pathway was inferred. A commendable photocatalytic activity was observed for B1.5G and BG1.5 under sunlight and LED light respectively. Hight amount of g-C3N4 in the BG1.5 resulted in maximum absorbance in LED light. Superoxide radicals (*O2-) radicals were observed as major radicals for B1.5G composite, whereas both *O2- and holes (h+) were the major radicals in case of BG1.5.
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Affiliation(s)
- Ankita Rani
- Environmental Nanotechnology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, 826004, Jharkhand, India; Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Aditya Swarup Lal
- Environmental Nanotechnology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, 826004, Jharkhand, India
| | - Pichiah Saravanan
- Environmental Nanotechnology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, 826004, Jharkhand, India.
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Lv J, Xu L, Zhao Z, Sun G. Novel Double Z-Scheme Heterojunction g-C3N4/BiNbO4@AgI Composite Catalyst with Good Response to Visible Light. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2022. [DOI: 10.1134/s0036024422130064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Vadivel S, Fujii M, Rajendran S. Novel S-scheme 2D/2D Bi 4O 5Br 2 nanoplatelets/g-C 3N 5 heterojunctions with enhanced photocatalytic activity towards organic pollutants removal. ENVIRONMENTAL RESEARCH 2022; 213:113736. [PMID: 35750121 DOI: 10.1016/j.envres.2022.113736] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/12/2022] [Accepted: 06/18/2022] [Indexed: 06/15/2023]
Abstract
Removal of organic pollutants and pharma products in waste water using semiconductor photocatalysts has gained huge interest among recent days. However, low visible light absorption, recombination rate of charge carriers and less availability of reaction sites are still major obstacles for the photocatalysis process. Herein, an in situ-forming Bi4O5Br2 nanosheets decorated on the surface g-C3N5 were prepared via simple hydrothermal method under ambient temperature. The basic pH condition plays a vital role in growing for Bi4O5Br2 nanosheets. Various characterization studies such as TEM, SEM, PL and UV-DRS studies confirmed the formation of close contact between the Bi4O5Br2 and g-C3N5 nanosheets. The construction of Bi4O5Br2 nanoplatelets/g-C3N5 nanocomposite increases the surface-active sites and improving the separation efficiencies of excitons, which is greatly influenced in the degradation of ciprofloxacin and bisphenol-A pollutants. Meanwhile, the flow of electrons from the layered structured graphite carbon of g-C3N5 which enables excellent electrical contact in the heterojunction. Besides, the main free radicals were determined as e- and •O2-, and production level of free radicals were confirmed by radical trapping experiments. The possible degradation mechanism was proposed and discussed. Finally, this work provides a unique approach to in-situ preparation of heterojunction photocatalysts and demonstrates the prepared Bi4O5Br2 nanoplatelets/g-C3N5 photocatalysts have great potential in the waste water management.
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Affiliation(s)
- Sethumathavan Vadivel
- Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8552, Japan.
| | - Manabu Fujii
- Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8552, Japan.
| | - Saravanan Rajendran
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez, 1775, Arica, Chile
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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.
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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.
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Fabrication of CQDs/Bi5Nb3O15 nanocomposites for photocatalytic degradation of veterinary pharmaceutical sarafloxacin. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Liu S, Zhou J, Zhou Y, Liu Y, Dai G. Synthesis and Characterization of a BiNbO
4
/Bi
2
S
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Nanocomposite with Improved Visible‐Light Photocatalytic Activity. ChemistrySelect 2020. [DOI: 10.1002/slct.202001532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Suqin Liu
- Department of Chemical Engineering and Food ScienceHubei University of Arts and Science Xiangyang Hubei 441053 China
| | - Jinghui Zhou
- Department of Chemical Engineering and Food ScienceHubei University of Arts and Science Xiangyang Hubei 441053 China
| | - Yang Zhou
- Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education and School of Chemical Engineering and TechnologyHainan University Haikou Hainan 570228 China
| | - Yuanyuan Liu
- Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education and School of Chemical Engineering and TechnologyHainan University Haikou Hainan 570228 China
| | - Gaopeng Dai
- Department of Chemical Engineering and Food ScienceHubei University of Arts and Science Xiangyang Hubei 441053 China
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Dong Y, Tao F, Wang L, Lan M, Zhang J, Hong T. One-pot preparation of hierarchical Cu 2O hollow spheres for improved visible-light photocatalytic properties. RSC Adv 2020; 10:22387-22396. [PMID: 35514579 PMCID: PMC9054622 DOI: 10.1039/d0ra02460k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 05/27/2020] [Indexed: 11/21/2022] Open
Abstract
As visible light photocatalysts, narrow bandgap semiconductors can effectively convert solar energy to chemical energy, exhibiting potential applications in alleviating energy shortage and environmental pollution. Cu2O hollow spheres with a narrow band gap and uniform hierarchical structures have been fabricated in a controlled way. The one-pot solvothermal method without any template is simple and facile. The morphologies, crystal structures, composition, specific surface areas, and optical and photoelectric properties of the products were analyzed by various techniques. The hollow and solid Cu2O spheres could be fabricated by controlling the reaction time, and a possible growth process of the Cu2O hollow spheres was revealed. The degradation of methyl orange (MO) was used to investigate the visible-light catalytic properties of the Cu2O samples. More than 90% of MO is degraded under visible light illumination of 20 min, exhibiting a quick catalytic reaction. The rate constant of the Cu2O hollow spheres was 2.54 times and 46.6 times larger than those of the Cu2O solid spheres and commercial Cu2O powder, respectively. The possible photocatalytic mechanism of MO was revealed over Cu2O hollow spheres through the detection of active species. The as-prepared Cu2O hollow spheres display improved visible-light catalytic activity and stability, indicating their potential application in wastewater treatment. As visible light photocatalysts, narrow bandgap semiconductors can effectively convert solar energy to chemical energy, exhibiting potential applications in alleviating energy shortage and environmental pollution.![]()
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Affiliation(s)
- Yali Dong
- Department of Chemistry and Chemical Engineering, Shaoxing University Zhejiang 312000 P. R. China +86-575-88342505
| | - Feifei Tao
- Department of Chemistry and Chemical Engineering, Shaoxing University Zhejiang 312000 P. R. China +86-575-88342505.,Shanghai Advanced Research Institute Library, Chinese Academy Sciences Shanghai 201210 P. R. China
| | - Linxia Wang
- Department of Chemistry and Chemical Engineering, Shaoxing University Zhejiang 312000 P. R. China +86-575-88342505
| | - Mingxuan Lan
- Department of Chemistry and Chemical Engineering, Shaoxing University Zhejiang 312000 P. R. China +86-575-88342505
| | - Jiayan Zhang
- Department of Chemistry and Chemical Engineering, Shaoxing University Zhejiang 312000 P. R. China +86-575-88342505
| | - Tianjie Hong
- Department of Chemistry and Chemical Engineering, Shaoxing University Zhejiang 312000 P. R. China +86-575-88342505
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Vinoth S, Sampathkumar P, Giribabu K, Pandikumar A. Ultrasonically assisted synthesis of barium stannate incorporated graphitic carbon nitride nanocomposite and its analytical performance in electrochemical sensing of 4-nitrophenol. ULTRASONICS SONOCHEMISTRY 2020; 62:104855. [PMID: 31806549 DOI: 10.1016/j.ultsonch.2019.104855] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 10/30/2019] [Accepted: 11/01/2019] [Indexed: 05/24/2023]
Abstract
We describe the ultrasonic assisted preparation of barium stannate-graphitic carbon nitride nanocomposite (BSO-gCN) by a simple method and its application in electrochemical detection of 4-nitrophenol via electro-oxidation. A bath type ultrasonic cleaner with ultrasonic power and ultrasonic frequency of 100 W and 50 Hz, respectively, was used for the synthesis of BSO-gCN nanocomposite material. The prepared BSO-gCN nanocomposite was characterized by employing several spectroscopic and microscopic techniques such as X-ray diffraction, X-ray photoelectron spectroscopy, fourier transform infra-red, field emission scanning electron microscopy, and high resolution transmission electron microscopy, to unravel the structural and electronic features of the prepared nanocomposite. The BSO-gCN was drop-casted on a pre-treated glassy carbon electrode (GCE), and their sensor electrode was utilized for electrochemical sensing of 4-nitrophenol (4-NP). The BSO-gCN modified GCE exhibited better electrochemical sensing behavior than the bare GCE and other investigated electrodes. The electroanalytical parameters such as charge transfer coefficient (α = 0.5), the rate constant for electron transfer (ks = 1.16 s-1) and number of electron transferred were calculated. Linear sweep voltammetry (LSV) exhibited increase in peak current linearly with 4-NP concentration in the range between 1.6 and 50 μM. The lowest detection limit (LoD) was calculated to be 1 μM and sensitivity of 0.81 μA μM-1 cm-2. A 100-fold excess of various ions, such as Ca2+, Na+, K+, Cl-, I-, CO32-, NO3, NH4+ and SO42- did not able to interfere with the determination of 4-NP and high sensitivity for detecting 4-NP in real samples was achieved. This newly developed BSO-gCN could be a potential candidate for electrochemical sensor applications.
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Affiliation(s)
- S Vinoth
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India; Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630 003, Tamil Nadu, India
| | - P Sampathkumar
- Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630 003, Tamil Nadu, India
| | - K Giribabu
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India; Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630 003, Tamil Nadu, India
| | - A Pandikumar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India; Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630 003, Tamil Nadu, India.
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Anjum M, Kumar R, Barakat MA. Synthesis of Cr 2O 3/C 3N 4 composite for enhancement of visible light photocatalysis and anaerobic digestion of wastewater sludge. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 212:65-76. [PMID: 29428655 DOI: 10.1016/j.jenvman.2018.02.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 01/10/2018] [Accepted: 02/01/2018] [Indexed: 05/27/2023]
Abstract
Visible light photocatalysts of Cr2O3/C3N4 composites (with different melamine concentrations) were prepared by high temperature calcination method. The composites samples were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy SEM, energy-dispersive X-ray spectroscopy (EDX), UV-visible spectroscopy and particle size analysis, which clearly indicated the coexistence of both Cr2O3 and C3N4 in the composites. The Cr2O3/C3N4 catalysts were tested for photocatalytic degradation of 2-chlorophenol in wastewater and solubilization of sludge in anaerobic digestion process to enhance biomethane production. The co-catalytic performance of Cr2O3, with 6% of melamine (precursor of C3N4), improved the photocatalytic degradation of 2-chlorophenol (k = 0.0156 min-1) under visible light, where up to 94% removal was achieved at optimum pH 5.0, pollutant concentration of 60 mg/L, and time duration of 180 min. On another hand, application of Cr2O3/C3N4 for photocatalytic pretreatment of sludge released the soluble substances in solution in which sCOD was increased from 431 mg/L to 3666 mg/L after 6 h and VS content decrease by only 9.1%, which indicated that the short time pretreatment could avoid the further mineralization of organic to complete degradation. Thereafter, anaerobic digestion of solubilized sludge was achieved after 30 days with production of 634 ml kg-1VS of methane and 46% of organic matter removal efficiency (OMRE), compared with 472 ml kg-1VS and 402 ml kg-1VS of methane, 35 and 31% of OMRE respectively in photolytic and raw sludge (control) reactors. These results can provide a useful base and reference for the multi applications of visible light Cr2O3/C3N4 photocatalyst in enhancement of degradation of toxic pollutant in wastewater and sludge stabilization with bioenergy production in practice.
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Affiliation(s)
- Muzammil Anjum
- Department of Environmental Sciences, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Rajeev Kumar
- Department of Environmental Sciences, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia
| | - M A Barakat
- Department of Environmental Sciences, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia; Central Metallurgical R & D Institute, Helwan 11421, Cairo, Egypt.
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Dadigala R, Bandi R, Gangapuram BR, Guttena V. Carbon dots and Ag nanoparticles decorated g-C 3 N 4 nanosheets for enhanced organic pollutants degradation under sunlight irradiation. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.03.032] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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