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Accelerated ZnMoO 4 photocatalytic degradation of pirimicarb under UV light mediated by peroxymonosulfate
Author(s) -
Chen ChiingChang,
Fan HuanJung,
Shaya Janah,
Chang YiKuo,
Golovko Vladimir B.,
Toulemonde Olivier,
Huang ChengHung,
Song YuXun,
Lu ChungShin
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5113
Subject(s) - pirimicarb , photocatalysis , photodegradation , chemistry , photochemistry , radical , diffuse reflectance infrared fourier transform , nuclear chemistry , electron paramagnetic resonance , catalysis , organic chemistry , botany , physics , aphid , nuclear magnetic resonance , biology
This paper reports the optimized synthesis of zinc molybdates by the hydrothermal method and the combination of ZnMoO 4 and peroxymonosulfate (PMS) under UV irradiation for the degradation of pirimicarb. The as‐prepared ZnMoO 4 photocatalyst was characterized using X‐ray diffraction, scanning electron microscopy, X‐ray photoelectron spectroscopy and UV–visible diffuse reflectance spectroscopy. The effects of operational parameters in the ZnMoO 4 /PMS/UV system were evaluated and the results indicated the highest performance is achieved with pH = 9.0, 1 mM PMS and 1 g l −1 ZnMoO 4 . The degradation efficiency of pirimicarb was 98% after 3 h in the photocatalytic process. A photodegradation mechanism is proposed based on scavenger and electron spin resonance studies to decide the main active species and by using chromatography–mass spectrometry to identify the major intermediates. Pirimicarb degradation is found to be mainly driven by holes and •O 2 − radicals, with the contribution of •OH and SO 4 •− radicals enhancing the process in the tested catalytic system. The mechanism is proposed involving two routes, dealkylation and decarbamoylation. Lastly, the zinc molybdate photocatalyst is shown to be stable, reusable and efficient in the removal of pirimicarb from real water samples in the presence of PMS, demonstrating potential application in the treatment of contaminated and/or environmental water.