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박영빈

Park, Young-Bin
Functional Intelligent Materials Lab.
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Cu (I/II)-Co (II/III) photocatalyst with intrinsic electron transport centre for photoreduction of chromium(VI) and photodegradation of methyl violet

Author(s)
Saikia, SayanikaSaikia, LakshiLee, SeonghwanPark, Young -BinSaha, Rafikul AliKhanam, Salma A.Zaki, Magdi E. A.Bania, Kusum K.
Issued Date
2024-04
DOI
10.1016/j.jece.2024.112344
URI
https://scholarworks.unist.ac.kr/handle/201301/82799
Citation
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, v.12, no.2, pp.112344
Abstract
A redox switchable photocatalyst consisting of mixed valent copper (Cu I/II ) sulfide (Cu x S) and cobalt (Co II/III ) oxide (Co y O z ) designated as Cu x S-Co y O z (x=1,2, y=1,3 and z=1,4) was synthesized to execute the Z -scheme photocatalysis process for photoreduction of chromium(VI), and photodegradation of Methyl Violet (MV) dye. The synthesized photocatalyst with a band gap of 3.3 eV was found to be highly effective to reduce 99.62% Cr (VI) and 99.32% of MV dye under UV -light irradiation. The possibility of switching the oxidation state in Cu and Co centre favored the band edge electron transfer on light irradiation and supported the Z -scheme electron transport chain. The photocatalytic reduction and degradation process was dependent on various reaction conditions like catalyst amount, pH of the reaction mixture, irradiation time. The reduction of Cr(VI) occurred with high efficacy at pH=2 while the MV dye degradation proceeded at high pH=10. The catalyst could reduce maximum concentration of Cr(VI) upto 250 ppm and MV dye upto 10 -3 M. The mechanism of the photocatalytic processes were well studied by different spectroscopic and electrochemical analysis. The photocatalytic activity of synthesized Cu x S-Co y O z catalyst was compared with five other transition metal sulfides M -S (MnS, FeS, Co a S b , NiS and ZnS, where a=3, 4; b=3, 4) combined with cobalt oxide and it was found that Cu x S-Co y O z exhibited the highest activity in both the photocatalytic process.
Publisher
ELSEVIER SCI LTD
ISSN
2213-2929
Keyword (Author)
Copper sulfideCobalt oxideChromiumMethyl violetZ -scheme photocatalysis
Keyword
DYE DEGRADATIONCR(VI)WATERNANOPARTICLESREDUCTIONREMOVALNANOCOMPOSITESPERFORMANCECOPPER SULFIDEORGANIC POLLUTANTS

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