Fabrication of magnetic bifunctional composite via anchoring CoY on waste heating pad as a cycling material for peroxymonosulfate activation to degrade p-arsanilic acid and simultaneously eliminate secondary As(V)
CHEMICAL ENGINEERING JOURNAL(2023)
摘要
Herein, waste heating pad, which mainly contains iron and vermiculite components after calcination in air, was used to support cobalt-yttrium bimetallic oxide for the first time. The magnetic material (IV@CoY) was applied for the activation of peroxymonosulfate (PMS) to simultaneously realize the removal of p-arsanilic acid (p-ASA) and the secondary inorganic arsenic (As(V)). 50 mu M p-ASA was completely degraded in the system of IV@CoY (0.2 g/L) and PMS (0.5 mM) within 7 min, and about 99 % of the produced As(V) was adsorbed within 150 min. Electrochemical experiments illustrated that IV@CoY possessed the superior conductivity as compared to CoY, which greatly boosted PMS activation. The pseudo-first-order rate constant (kIV@CoY) was high up to 0.873 min-1, which was 7.6 times larger than kCoY (0.115 min-1). Catalytic mechanism analyses revealed that the produced SO4 center dot-, center dot OH and 1O2 participated in the oxidation of p-ASA and As(III). The adsorption of the produced As(V) was achieved by ion exchange with - OH/CO32-on the surface of IV@CoY. The degradation pathways of p- ASA were further proposed on the basis of the detection of its intermediate products. Initial pH exerted a sig-nificant effect on the degradation-adsorption reaction and weak acidic or neutral condition was beneficial to the removal of p-ASA and As(V). To evaluate the practical application potential of IV@CoY, the disposal of p-ASA and secondary As(V) were also carried out in real water samples. Furthermore, IV@CoY was consecutively used for 5 times, and almost 100% degradation of p-ASA and over 97% adsorption of inorganic arsenic were still achieved even in the fifth round, which prove its high stability and reusability. Our results fully demonstrate that the magnetic IV@CoY is a promising catalyst to activate PMS for eliminating organoarsenic from water.
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关键词
Magnetic IV@CoY,Peroxymonosulfate,Organoarsenic,Degradation,Adsorption
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