Journal Article10.1039/C6RA10371E
Preparation, characterization and application of Cu–Ni/TiO2 in Orange II photodegradation under visible light: effect of different reaction parameters and optimization
Nadia Riaz,Fai Kait Chong,Zakaria Man,Rizwana Sarwar,Umar Farooq,Asad U. Khan,Muhammad Saeed Khan +6 more
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TL;DR: In this article, the physicochemical and morphological properties of bimetallic Cu-Ni/TiO2 photocatalysts were studied using different characterization techniques. And the photocatalyst performance of Bimetallic CoNi/NiO2 for Orange II decoloration and mineralization is promising compared to bare TiO2 and the monometallic CoN 2 photocatalysers.
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Abstract: Bimetallic Cu–Ni/TiO2 photocatalysts were prepared using a wet impregnation method. The physicochemical and morphological properties of the photocatalysts were studied using different characterization techniques. FTIR analysis showed the nitrate peaks are still present but did not show an effect on the catalytic performance of the photocatalysts. Photocatalysts were of nanosize and their morphologies are spherical and slightly agglomerated. From DR-UV-visible analysis, it was proved that incorporation of Cu and Ni onto TiO2 has successfully shifted the optical absorption to the visible region with reduced bandgap energies. Furthermore, by increasing the calcination temperature the bandgap energy was reduced. The lowest band gap energy (2.74 eV) was reported for 9Cu:1Ni-300. Photocatalytic degradation of Orange II was studied under visible light. The photocatalyst performance of bimetallic Cu–Ni/TiO2 for Orange II decoloration and mineralization is promising compared to bare TiO2 and the monometallic photocatalysts. Compared to other Cu:Ni mass compositions, results for photodegradation studies showed that a 9Cu:1Ni mass composition was observed with 100% Orange II decoloration and 89.8% and 100% TOC removal in 1 h and 1.5 h of irradiation duration, respectively. The optimum pH value was 6.8. The main identified intermediates and by-products of Orange II photodegradation under visible light irradiation during reaction as a function of time were oxalic acid, formic acid, formaldehyde, benzyl alcohol and benzaldehyde as measured by HPLC analysis.
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A critical review on advances in the practices and perspectives for the treatment of dye industry wastewater.
Toral Shindhal,Parita Rakholiya,Sunita Varjani,Ashok Pandey,Huu Hao Ngo,Wenshan Guo,How Yong Ng,Mohammad J. Taherzadeh +7 more
TL;DR: In this article, the most advanced and state-of-art technical and scientific developments about the treatment of dye industry wastewater, which include advanced oxidation process, membrane filtration technique, microbial technologies, bio-electrochemical degradation, photocatalytic degradation, etc.
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Templated Dewetting-Alloying of NiCu Bilayers on TiO2 Nanotubes Enables Efficient Noble Metal-Free Photocatalytic H2 Evolution
Davide Spanu,Davide Spanu,Sandro Recchia,Shiva Mohajernia,Ondřej Tomanec,Štěpán Kment,Radek Zboril,Patrik Schmuki,Patrik Schmuki,Patrik Schmuki,Marco Altomare +10 more
TL;DR: In this article, an efficient noble-metal-free photocatalytic platform for H2 evolution based on alloyed NiCu co-catalytic nanoparticles at the surface of anodic TiO2 nanotube arrays is presented.
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An Operando X-ray Absorption Spectroscopy Study of a NiCu−TiO2 Photocatalyst for H2 Evolution
Davide Spanu,Alessandro Minguzzi,Sandro Recchia,Fahimeh Shahvardanfard,Ondřej Tomanec,Radek Zboril,Patrik Schmuki,Patrik Schmuki,Patrik Schmuki,Paolo Ghigna,Marco Altomare +10 more
TL;DR: In this paper, bimetallic Ni-decorated semiconductors represent a potential low-cost alternative to noble-metal-modified photocatalysts, which can provide a rema...
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Photocatalytic degradation and kinetic modeling of azo dye using bimetallic photocatalysts: effect of synthesis and operational parameters
Nadia Riaz,Maryam Hassan,Maria Siddique,Qaisar Mahmood,Umar Farooq,Rizwana Sarwar,Muhammad Saqib Khan +6 more
TL;DR: Photocatalysts synthesized using anatase TiO 2 were reported with improved performance compared to rutile phase and the higher rate constant that proves the excellent adsorption capacity of the tested photoc atalysts for tested pollutants on the surface may have a great prospective for photocatalytic water purification at neutral pH.
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Mechanistic understanding of Cu-based bimetallic catalysts
TL;DR: In this article, two modification mechanisms of co-catalyst on the coordination environment change of Cu-based catalysts are reviewed, and the mechanistic understanding can provide significant guidance for the design and controllable synthesis of novel Cu-Based catalysts used in many industrial reactions.
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