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Razafintsalama AR, Mishra RP, Sahoo MK, Mrinalini M, Sahoo B, Ravelonandro P, Chaudhary YS. Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO 4-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:12725-12739. [PMID: 37655778 DOI: 10.1021/acs.langmuir.3c01462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
The synergistically MXene (Ti3C2Tx) co-catalyst-decorated BiVO4-based heterostructured photocatalysts have been synthesized by a hydrothermal approach with varied loading concentrations of MXene (Ti3C2Tx) to drive the hexavalent chromium reduction efficiently. The formation of the heterostructured photocatalyst was confirmed by the appearance of X-ray diffraction (XRD) peaks corresponding to the monoclinic BiVO4 phase and MXene (Ti3C2Tx) and also the antisymmetric (834 cm-1) and symmetric stretching (715 cm-1) of tetrahedral VO4 and D (1330 cm-1) and G (1570 cm-1) bands corresponding to MXene (Ti3C2Tx) in the Raman spectrum. The worm-like structures of BiVO4 nanocrystals grew onto the lamellar sheets of MXene (Ti3C2Tx), as shown by field emission scanning electron microscopy (FESEM), and has an increased surface area of 15.62 m2g-1 in the case of BVO-20-TC. X-ray photoelectron spectroscopy (XPS) analysis confirms the presence of V5+ and Ti3+states, and the uniform distribution of BiVO4 nanocrystals over lamellar sheets of MXene (Ti3C2Tx) is evident from energy-dispersive X-ray (EDX) analysis. The ultraviolet-diffuse reflectance spectroscopy (UV-DRS) spectra suggest a decrease in the band gap energy of BVO-20-TC to 2.335 eV, promoting a higher degree of visible light harvesting. Upon optimization, by varying the pH, the amount of the photocatalyst, and the concentration of Cr(IV), BVO-20-TC exhibits the highest photocatalytic efficiency (96.39%) while using a Cr(VI) concentration of 10 ppm at pH 2 and 15 mg of the photocatalyst, and the photoreduction of Cr(VI) to Cr(III) follows the pseudo-first-order reaction. The decrease in the PL intensity in BVO-20-TC reveals a faster transfer of electrons from MXene (Ti3C2Tx) to BiVO4. Further, the higher degree of band bending at the BiVO4/MXene (Ti3C2Tx) heterojunction, revealed from the Mott-Schottky analysis, facilitates efficient charge transfer and eventually faster and efficient photoreduction of Cr(VI) to Cr(III). The reusability and stability test undertaken for BVO-20-TC reveals that even after five cycles, the Cr (VI) photoreduction efficacy is retained. This work provides insights into photoreduction of Cr (VI) by using such heterostructures.
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Affiliation(s)
- A Rija Razafintsalama
- Materials Chemistry Department, CSIR-Institute of Minerals Technology, Bhubaneswar, Odisha 751013, India
- Procédés et Ecologie Industrielle, Unité de Recherche en Génie des Procédés et Génie de l'Environnement, University of Antananarivo, Antananarivo 101, Madagascar
| | - Rajashree P Mishra
- Materials Chemistry Department, CSIR-Institute of Minerals Technology, Bhubaneswar, Odisha 751013, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Manas K Sahoo
- Materials Chemistry Department, CSIR-Institute of Minerals Technology, Bhubaneswar, Odisha 751013, India
| | - Madoori Mrinalini
- Materials Chemistry Department, CSIR-Institute of Minerals Technology, Bhubaneswar, Odisha 751013, India
| | - Bismaya Sahoo
- Materials Chemistry Department, CSIR-Institute of Minerals Technology, Bhubaneswar, Odisha 751013, India
| | - Pierre Ravelonandro
- Procédés et Ecologie Industrielle, Unité de Recherche en Génie des Procédés et Génie de l'Environnement, University of Antananarivo, Antananarivo 101, Madagascar
| | - Yatendra S Chaudhary
- Materials Chemistry Department, CSIR-Institute of Minerals Technology, Bhubaneswar, Odisha 751013, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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Editorial: Special Issue on Photocatalytic Nanocomposite Materials (PNMs). Catalysts 2021. [DOI: 10.3390/catal11050587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
This Special Issue titled “Photocatalytic Nanocomposite Materials” (PNMs) is devoted to the research into new-generation PNMs, particularly for the processes of solar radiation energy conversion with its focus lying on the physicochemical principles of creating new materials with purposeful properties for their specific applications [...]
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Didari J, Sadeghzadeh-Attar A. Ni-N codoped SnO2/Fe2O3 nanocomposite as advanced bifunctional photocatalyst for simultaneous photocatalytic redox conversion of Cr(VI) and As(III). J Taiwan Inst Chem Eng 2021. [DOI: 10.1016/j.jtice.2021.02.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Conventional and Current Methods of Toxic Metals Removal from Water Using g-C3N4-Based Materials. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-020-01803-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Photocatalytic Reduction of Cr(VI) in the Presence of Humic Acid Using Immobilized Ce-ZrO 2 under Visible Light. NANOMATERIALS 2020; 10:nano10040779. [PMID: 32325680 PMCID: PMC7221772 DOI: 10.3390/nano10040779] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 04/10/2020] [Accepted: 04/16/2020] [Indexed: 12/23/2022]
Abstract
Cr(VI) has several industrial applications but it is one of the most dangerous pollutants because of its carcinogenicity and high toxicity. Thus, the removal of Cr(VI) by photocatalytic reduction was investigated. The catalyst applied, Ce–ZrO2, was immobilized, through a sol–gel process on a silicon carbide (SiC) support, to increase the efficiency and avoid using suspended nanoparticles. The influence of initial pH, humic acid (HA), and catalyst dosage was investigated for Cr(VI) containing solutions. Then, a real galvanizing industry effluent (Cr(VI) = 77 mg L-1mg.L−1, Zn = 1789 mg L−1) was treated. It was observed that Cr(VI) adsorption and photoreduction are greatly favored at low pH values. HA can decrease Cr(VI) adsorption but also acts as holes scavenger, reducing the electron–hole recombination, favoring then the photoreduction. With the immobilized Ce–ZrO2, more than 97% of Cr(VI) was removed from the diluted effluent. These results indicate the feasibility to treat Cr(VI) effluents even in the presence of other metals and natural organic matter. The developed material has great chemical and mechanical resistances and avoids the use of nanoparticles, dangerous for the environment and hard to recover. Moreover, solar light can be used to drive the process, which contributes to the development of more sustainable, cleaner, and cost-effective wastewater treatments.
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Enhanced photocatalytic reduction of toxic Cr(VI) with Cu modified ZnO nanoparticles in presence of EDTA under UV illumination. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-1282-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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