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Magalhães de Sousa C, Luiz Cardoso V, Regina Xavier Batista F. A Coupled photocatalytic system using niobium oxide and microalga: cr (vi)-contaminated wastewater treatment. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Njoya O, Zhao S, Shen J, Kong X, Gong Y, Wang B, Kang J, Chen Z. Acetate improves catalytic performance for rapid removal of Cr(VI) by sodium borohydride in aqueous environments. Sep Purif Technol 2022; 301:122051. [DOI: 10.1016/j.seppur.2022.122051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Alias N, Hussain Z, Tan WK, Kawamura G, Muto H, Matsuda A, Lockman Z. Photoreduction of Cr(VI) in wastewater by anodic nanoporous Nb 2O 5 formed at high anodizing voltage and electrolyte temperature. Environ Sci Pollut Res Int 2022; 29:60600-60615. [PMID: 35426025 DOI: 10.1007/s11356-022-20005-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 03/27/2022] [Indexed: 06/14/2023]
Abstract
In this study, nanoporous anodic film was produced by anodization of niobium, Nb in a fluoride ethylene glycol electrolyte. The effect of anodization voltage and electrolyte temperature was studied to find an optimum condition for circular, ordered, and uniform pore formation. The diameter of the pores was found to be larger when the applied voltage was increased from 20 to 80 V. The as-anodized porous film was also observed to comprise of nanocrystallites which formed due to high field-induced crystallization. The nanocrystallites grew into orthorhombic Nb2O5 after post-annealing treatment. The Cr(VI) photoreduction property of both the as-anodized and annealed Nb2O5 samples obtained using an optimized condition (anodization voltage: 60 V, electrolyte temperature: 70 °C) was compared. Interestingly, the as-anodized Nb2O5 film was found to display better photoreduction of Cr(VI) than annealed Nb2O5. However, in terms of stability, the annealed Nb2O5 presented high photocatalytic efficiency for each cycle whereas the as-anodized Nb2O5 showed degradation in photocatalytic performance when used continually.
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Affiliation(s)
- Nurhaswani Alias
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Pulau Pinang, Malaysia
| | - Zuhailawati Hussain
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Pulau Pinang, Malaysia
| | - Wai Kian Tan
- Institute of Liberal Arts and Sciences, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
| | - Go Kawamura
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
| | - Hiroyuki Muto
- Institute of Liberal Arts and Sciences, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
| | - Atsunori Matsuda
- Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan
| | - Zainovia Lockman
- School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Pulau Pinang, Malaysia.
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Budiman F, Tan WK, Kawamura G, Muto H, Matsuda A, Abdul Razak K, Lockman Z. Formation of Dense and High-Aspect-Ratio Iron Oxide Nanowires by Water Vapor-Assisted Thermal Oxidation and Their Cr(VI) Adsorption Properties. ACS Omega 2021; 6:28203-28214. [PMID: 34723018 PMCID: PMC8552462 DOI: 10.1021/acsomega.1c04280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/05/2021] [Indexed: 06/13/2023]
Abstract
Coral-like and nanowire (NW) iron oxide nanostructures were produced at 700 and 800 °C, respectively, through thermal oxidation of iron foils in air- and water vapor-assisted conditions. Water vapor-assisted thermal oxidation at 800 °C for 2 h resulted in the formation of highly crystalline α-Fe2O3 NWs with good foil surface coverage, and we propose that their formation was due to a stress-driven surface diffusion mechanism. The Cr(VI) adsorption property of an aqueous solution on α-Fe2O3 NWs was also evaluated after a contact time of 90 min. The NWs had a removal efficiency of 97% in a 225 mg/L Cr(VI) solution (pH 2, 25 °C). The kinetic characteristic of the adsorption was fitted to a pseudo-second-order kinetic model, and isothermal studies indicated that the α-Fe2O3 NWs exhibited an adsorption capacity of 66.26 mg/g. We also investigated and postulated a mechanism of the Cr(VI) adsorption in an aqueous solution of α-Fe2O3 NWs.
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Affiliation(s)
- Faisal Budiman
- Green
Electronic Nanomaterials Group, School of Materials and Mineral Resources
Engineering, Engineering Campus, Universiti
Sains Malaysia, Nibong
Tebal 14300, Penang, Malaysia
- Department
of Electrical Engineering, School of Electrical Engineering, Telkom University, Jl. Telekomunikasi No. 1, Bandung 40257, Indonesia
| | - Wai Kian Tan
- Institute
of Liberal Arts & Sciences, Toyohashi
University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Go Kawamura
- Department
of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Hiroyuki Muto
- Institute
of Liberal Arts & Sciences, Toyohashi
University of Technology, Toyohashi, Aichi 441-8580, Japan
- Department
of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Atsunori Matsuda
- Department
of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Khairunisak Abdul Razak
- Green
Electronic Nanomaterials Group, School of Materials and Mineral Resources
Engineering, Engineering Campus, Universiti
Sains Malaysia, Nibong
Tebal 14300, Penang, Malaysia
| | - Zainovia Lockman
- Green
Electronic Nanomaterials Group, School of Materials and Mineral Resources
Engineering, Engineering Campus, Universiti
Sains Malaysia, Nibong
Tebal 14300, Penang, Malaysia
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