Study on Photoelectrocatalytic Decolorization Mechanism of Methylene Blue Under the Visible-light Irradiation by Measuring Chemical Oxygen Demand Index†

doi:10.7503/cjcu20190030

Abstract

CLC Number:

TrendMD:

LIU Fen, ZHOU Min, WANG Suxia, WANG Rong, YANG Ning, MA Yongjun. Study on Photoelectrocatalytic Decolorization Mechanism of Methylene Blue Under the Visible-light Irradiation by Measuring Chemical Oxygen Demand Index^†[J]. Chem. J. Chinese Universities, 2019, 40(9): 1988.

Figures/Tables 9

Fig.1 SEM images of modified photoelectrodes CuInSe2/GC(A), CuInSe2/Ag3PO4@AgIO4/GC(B) and TEM images of CuInSe2/Ag3PO4@AgIO4 granular catalyst material(C, D)

Fig.2 Effect of H2O2 concentration on the decoloration efficiency of MB dye through a fixed reaction time Irradiation time: 45 min.

Fig.3 Effect of pH value of supporting electrolyte on the decoloration efficiency of MB dye in the visible-light photoelectrocatalytic reaction H2O2 initial concentation: 0.42 mol/L; reaction temperature: 50 ℃; irradiation time: 45 min.

Fig.4 Influence of applied bias voltage on the degradation efficiency of MB dye in the visible-light photoelectrocatalytic reaction(A) and the voltammogram of MB testing solution using linear sweep voltammetry(LSV) under the visible-light irradiation condition(B)

pH	2.7	3.7
Decoloration rate, D(%)	86.0	54.0
η^*(%)	45.0	20.8
η^**(%)	16.3	6.8
MB Mineralization rate, M^a (%)	10.1	3.7
D/M ratio	8.5	14.6

Fig.5 Influence of irradiation time on ultraviolet-visible absorption spectra(A) and the degradation efficiency of MB dye(B) Curves a—c represen the decoloration rate(D), COD removal rate of the supernatant fraction(η*) and total COD removal rate(η**), respectively.

Fig.6 Effect of the reaction temperature on the degradation efficiency of MB dye in the visible-light photoelectrocatalytic reaction

Fig.7 Variation of FTIR spectra of MB testing solution at different irradiation time during the visible-light photoelectrocatalytic reaction process

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