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Catalytic degradation of methyl red using PZnW 11 / m‐Go as a high‐performance photocatalyst
Author(s) -
Aghbolagh Zahra Shokri,
Rahmatyan Mohammad Saim,
Khorrami Mohammad Reza Khanmohammadi
Publication year - 2021
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13657
Subject(s) - catalysis , photocatalysis , degradation (telecommunications) , polyoxometalate , decomposition , aqueous solution , response surface methodology , irradiation , chemistry , nuclear chemistry , visible spectrum , photochemistry , materials science , chromatography , organic chemistry , telecommunications , optoelectronics , physics , computer science , nuclear physics
In this research, zinc (II)‐substituted Keggin‐type polyoxometalate [(C 4 H 9 ) 4 N] PZnW 11 O 39 (PZnW 11 ) was prepared and stabilized on the modified graphene oxide (m‐GO) for removal of methyl red (MR) dye from aqueous solution. The maximum dye degradation and significance of variables on the decolorization system in static conditions were determined using response surface methodology (RSM). The main variables affecting the decolorization performance on dye decolorization, including system temperature (25–40°C), catalyst amount (0.001–0.005 g), and irradiation time (5–25 min), were evaluated. The optimum temperature, catalyst applying amount, and irradiation time were identified as 35°C, 0.003 g, and 20 min, respectively, and the experimental dye removal value was 96.8%. The high regression coefficient between the response and the variables ( R 2 = 0.9335) showed a good investigation of the experimental results by regression‐based polynomial model. In comparison with the previously reported photocatalytic decolorization systems, the dye removal system suggested in this work is quick, easy and involves a small amount of catalyst. Polyoxometalate‐based photocatalyst (PZnW 11 /m‐GO) shows potent visible‐light photocatalytic activity for the decolorization of methyl red dye, due to the generates the strong oxidants hydroxyl radical (OH) and superoxide anion radical (O 2 − ) via photoelectrochemical decomposition of H 2 O and O 2 in the presence of visible light irradiation. Efficient decolorization and degradation of organic contaminants by synthesized catalyst PZnW 11 /m‐GO suggest its potential for real industrial applications in removal of synthetic dye wastewater.