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Waseem M, Ahmad A, Sagir M, Younas U, Saeed Z, Pervaiz M, Ali F, Aljuwayid AM, Habila MA, Karri RR. Hydrothermal synthesis of V 2O 5/TiO 2 decorated graphitic carbon nitride nanocomposite for biomolecule oxidation inhibition and dye degradation applications. ENVIRONMENTAL RESEARCH 2023; 234:116440. [PMID: 37356527 DOI: 10.1016/j.envres.2023.116440] [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: 01/19/2023] [Revised: 06/11/2023] [Accepted: 06/15/2023] [Indexed: 06/27/2023]
Abstract
Oxides of vanadium, titanium and graphitic carbon nitride (g-C3N4) are well known for their catalytic activities. In order to achieve synergic catalytic effects, a novel nanocomposite (NC) i.e. V2O5/TiO2/g-C3N4 has been synthesized by a very simple, ecofriendly and nonhazardous hydrothermal method. The fabricated NC was characterized employing UV-Visible, FTIR, SEM, and XRD techniques. UV-Visible and FTIR analysis indicated the formation of the nanocomposite and XRD analysis confirmed the association of V2O5 and TiO2 with g-C3N4 in nanocomposite. SEM study indicated the hetero-structure of NC having size ranging from 50 to 80 nm and it was found having hexagonal crystallite structure. The synthesized nanocomposite exhibited excellent scavenging of free radicals DPPH● (91%) and ABTS●+ (64%) that are responsible for the oxidation of biomolecules. Therefore, NC can be claimed having biomolecule oxidation protective potential. In addition, photocatalytic ability for the degradation of methylene blue (MB) and methyl orange (MO) was also achieved up to 94% and 89% respectively. The synthesized novel nanocomposite exhibited excellent potential to remove free radicals and dyes from aqueous medium which can be further used for the environmental remediation.
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Affiliation(s)
- Muhammad Waseem
- Department of Chemistry, The University of Lahore, Lahore, Pakistan
| | - Awais Ahmad
- Department of Chemistry, The University of Lahore, Lahore, Pakistan; Departamento de Química Orgánica Universidad de Córdoba Campus de, Edificio Marie Curie (C-3) Ctra Nnal IV, Km 396, Córdoba, Spain.
| | - Muhammad Sagir
- Department of Chemical Engineering Khwaja Fareed University of Engineering and Information Technology, Pakistan
| | - Umer Younas
- Department of Chemistry, The University of Lahore, Lahore, Pakistan
| | - Zohaib Saeed
- Department of Chemistry, Government College University Lahore, Lahore, Pakistan
| | - Muhammad Pervaiz
- Department of Chemistry, Government College University Lahore, Lahore, Pakistan.
| | - Faisal Ali
- Department of Chemistry, The University of Lahore, Lahore, Pakistan.
| | - Ahmed Muteb Aljuwayid
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Mohamed A Habila
- Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Rama Rao Karri
- Petroleum and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Mukim, Gadong, 1410, Brunei.
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Zheng MW, Yang SJ, Pu YC, Liu SH. Mechanisms of biochar enhanced Cu 2O photocatalysts in the visible-light photodegradation of sulfamethoxazole. CHEMOSPHERE 2022; 307:135984. [PMID: 35964722 DOI: 10.1016/j.chemosphere.2022.135984] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 07/16/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
Cu2O nanoparticles are decorated with biochars derived from spent coffee grounds (denoted as Cu2O/SCG) and applied as visible-light-active photocatalysts in the sulfamethoxazole (SMX) degradation. The physicochemical properties of Cu2O/SCG are identified by various spectral analysis, electrochemical and photochemical techniques. As a result, the Cu2O/SCG exhibits the higher removal efficiency of SMX than the pristine Cu2O under visible light irradiation. We can observe that Cu2O could be incorporated onto the SCG biochars with rich oxygen vacancies/adsorbed hydroxyl groups. In addition, the Cu2O/SCG has the lower charge transfer resistance, faster interfacial electron transfer kinetics, decreased recombination of charge carriers and superior absorbance of visible light. The construction of band diagrams for Cu2O/SCG and pristine Cu2O via UV-vis spectra and Mott-Schottky plots suggest that the band energy shifts and higher carrier density of Cu2O/SCG may be responsible for the photocatalytic activity enhancements. From the radical scavenger experiments and electron paramagnetic resonance spectra, the aforementioned energy shifts could decrease the energy requirement of transferring photoinduced electrons to the potential for the formation of active superoxide radicals (·O2-) via one and two-electron reduction routes in the photocatalytic reaction. A proposed degradation pathway shows that ·O2- and h+ are two main active species which can efficiently degrade SMX into reaction intermediates by oxidation, hydroxylation, and ring opening. This research demonstrates the alternative replacement of conventional carbon materials for the preparation of biochar-assisted Cu2O photocatalysts which are applied in the environmental decontamination by using solar energy.
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Affiliation(s)
- Meng-Wei Zheng
- Department of Environmental Engineering, National Cheng Kung University, Tainan, 70101, Taiwan
| | - Shan-Jen Yang
- Department of Materials Science, National University of Tainan, Tainan, 70005, Taiwan
| | - Ying-Chih Pu
- Department of Materials Science, National University of Tainan, Tainan, 70005, Taiwan
| | - Shou-Heng Liu
- Department of Environmental Engineering, National Cheng Kung University, Tainan, 70101, Taiwan.
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Preparation and Application of Nb 2O 5 Nanofibers in CO 2 Photoconversion. NANOMATERIALS 2021; 11:nano11123268. [PMID: 34947617 PMCID: PMC8704612 DOI: 10.3390/nano11123268] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/25/2021] [Accepted: 11/27/2021] [Indexed: 11/17/2022]
Abstract
Increasing global warming due to NOx, CO2, and CH4, is significantly harming ecosystems and life worldwide. One promising methodology is converting pollutants into valuable chemicals via photocatalytic processes (by reusable photocatalysts). In this context, the present work aimed to produce a Nb2O5 photocatalyst nanofiber system by electrospinning to convert CO2. Based on the collected data, the calcination at 600 ∘C for 2 h resulted in the best condition to obtain nanofibers with homogeneous surfaces and an average diameter of 84 nm. As a result, the Nb2O5 nanofibers converted CO2 mostly into CO and CH4, reaching values around 8.5 μmol g−1 and 0.55 μmol g−1, respectively.
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Chand H, Choudhary P, Kumar A, Kumar A, Krishnan V. Atmospheric pressure conversion of carbon dioxide to cyclic carbonates using a metal-free Lewis acid-base bifunctional heterogeneous catalyst. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101646] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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