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Lian W, Wang L, Xu L, Fu X, He Z, Tao J, Xia Y, Li H, Xu X. One-pot synthesis of interfacially bonded Bi 4O 5Br 2/Bi 2S 3 Z-scheme heterostructures with boosted photocatalysis towards dodecylbenzenesulfonate and real hotel laundry wastewater. CHEMOSPHERE 2024; 352:141297. [PMID: 38296211 DOI: 10.1016/j.chemosphere.2024.141297] [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: 07/17/2023] [Revised: 12/23/2023] [Accepted: 01/23/2024] [Indexed: 02/03/2024]
Abstract
The ubiquitous contamination of surfactants in wastewater has raised global concerns. Photocatalysis is deemed as a promising yet challenging approach for the decomposition of surfactant residues. Herein, a novel Z-scheme heterojunction of Bi4O5Br2/Bi2S3 with covalent S-O bonds was prepared via a facile one-pot hydrothermal and subsequent annealing process. The prepared optimal Bi4O5Br2/Bi2S3 composite exhibited remarkable photo-degradation activity towards the sodium dodecylbenzene sulfonate (SDBS). The Z-scheme reaction mechanism was proposed and validated by meticulous analysis of quenching tests, ESR spectroscopy and DFT calculations. Furthermore, the presence of chemical S-O linkages between Bi4O5Br2 and Bi2S3 was identified via FT-IR and XPS analyses, which served as a distinct bridge to modify the Z-scheme route for carrier transport. The Z-scheme heterostructure, in conjunction with chemical S-O bonds, synergistically enhanced the separation rate of electron-hole pairs and thus greatly boosted the photocatalytic activity. Additionally, the possible degradation pathways of SDBS were proposed by using HR-MS technology. Moreover, real hotel laundry wastewater could be efficiently disposed by the photocatalysis of the Bi4O5Br2/Bi2S3 with a decrease in the COD value from 428 to 74 mg/L, indicating that the fabricated Z-scheme heterojunction hold great promise for effectively removing refractory surfactant contaminants from aquatic environment.
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Affiliation(s)
- Wenqian Lian
- School of Culture and Tourism, Jiangsu University of Technology, Changzhou, 13001, China
| | - Lei Wang
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China
| | - Lin Xu
- Days Hotel & Suites Fudu, Changzhou, 213003, China
| | - Xiaofei Fu
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China.
| | - Zuming He
- School of Microelectronics and Control Engineering, Changzhou University, Changzhou, 213164, China
| | - Junwu Tao
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China
| | - Yongmei Xia
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China
| | - Huimin Li
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China
| | - Xinyue Xu
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, 213001, China
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Punyasamudram S, Puthalapattu RP, Bathinapatla A, Mulpuri R, Kanchi S, Kumar PVN. Multifunctional characteristics of biosynthesized CoFe 2O 4@Ag nanocomposite by photocatalytic, antibacterial and cytotoxic applications. CHEMOSPHERE 2024; 349:140892. [PMID: 38070614 DOI: 10.1016/j.chemosphere.2023.140892] [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: 06/17/2023] [Revised: 09/12/2023] [Accepted: 12/02/2023] [Indexed: 01/10/2024]
Abstract
Carissa carandas, a traditional medicinal herb with a high concentration of antioxidant phytochemicals, has been used for thousands of years in the Ayurveda, Unani, and homoeopathic schools of medicine. By employing Carissa carandas bark extract as a reducing and capping agent in green biosynthesis, we extend this conventional application to produce CoFe2O4 and CoFe2O4@Ag nanocomposite. A variety of techniques have been used to characterize the synthesised nanocomposite, including UV-Vis, FTIR, XRD, FESEM, EDX, and BET. The CoFe2O4 and CoFe2O4@Ag nanocomposite demonstrated promising antibacterial action against human bacterial pathogens like B. subtilis and S. aureus as gram positive and P. aeruginosa and E. coli as gram negative with inhibition zones of 24.3 ± 0.57, 17.4 ± 0.75 and 20.5 ± 0.5, 19.8 ± 1.6 mm respectively, and the obtained results were superior to the nanocomposite without silver. Moreover, in-vitro cytotoxicity effects of biosynthesized CoFe2O4 and CoFe2O4@Ag were performed on the human breast cancer cell MCF-7. It was found that the MCF-7 cells' 50% inhibitory concentration (IC50) was 60 μg/mL. Additionally, biosynthesized CoFe2O4 and CoFe2O4@Ag nanocomposite was used to demonstrate the photocatalytic eradication of Rhodamine Blue (RhB). Due to the addition of Ag, which increases surface area, conductivity, and increased charge carrier separation, the CoFe2O4@Ag nanocomposite exhibits a high percentage of photocatalytic degradation of ⁓ 98% within 35 min under UV light irradiation. The photocatalytic performance of as-synthesised nanocomposite was evaluated using dye degradation-adsorption in both natural light and dark condition. Under dark conditions, it was found that 2 mg mL-1 CoFe2O4@Ag in RhB aqueous solution (5 ppm) causes dye adsorption in 30 min with an effectiveness of 72%. Consequently, it is anticipated that the CoFe2O4@Ag nanocomposite will be a promising photocatalyst and possibly a noble material for environmental remediation applications.
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Affiliation(s)
- Sandhya Punyasamudram
- Department of Chemistry, GITAM University, Hyderabad, 502329, Telangana, India; Department of Chemistry, Sri Padmavati Mahila Visvavidyalayam, Tirupati, 517502, Andhra Pradesh, India
| | - Reddy Prasad Puthalapattu
- Department of Chemistry, Institute of Aeronautical Engineering, Hyderabad, 500043, Telangana, India.
| | - Ayyappa Bathinapatla
- Department of Chemistry, CMR Institute of Technology, Bengaluru, 560037, India; Centre of Excellence- Sensors & Nanoelectronics, CMR Institute of Technology, Bengaluru, 560037, India
| | - Ravikumar Mulpuri
- Department of Chemistry, Raghu Engineering College (Autonomous), Dakamarri (v), Bheeminipatnam, Visakhapatnam, 531162, Andhra Pradesh, India
| | - Suvardhan Kanchi
- Department of Chemistry, CHRIST (Deemed to be University), Bengaluru, 560 029, India.
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