Remediation of organic arsenic contaminants with heterogeneous Fenton process mediated by SiO2-coated nano zero-valent iron.,Environmental Science and Pollution Research

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Remediation of organic arsenic contaminants with heterogeneous Fenton process mediated by SiO2-coated nano zero-valent iron.
Environmental Science and Pollution Research Pub Date : 2020-01-25 , DOI: 10.1007/s11356-020-07808-2
Yuancai Lv _{1,

2} , Siyi Huang ₁ , Guofu Huang ₃ , Yifan Liu _{1,

2} , Guifang Yang ₁ , Chunxiang Lin ₁ , Gao Xiao ₁ , Yonghao Wang ₁ , Minghua Liu ₁

Affiliation

Given their considerable solubility in water and potentially high toxicity to human health, organoarsenic compounds have become an emerging contaminant. Herein, a heterogeneous Fenton process mediated by SiO2-coated nano zero-valent iron (SiO2-nZVI) was employed to simultaneously remove the p-arsanilic acid (p-ASA, a typical organoarsenic compound) and the released arsenic. The initial pH value significantly influenced on the degradation of p-ASA and at the optimal pH (3.0), p-ASA (10 mg L-1) could be completely oxidized to As(V), NH4+, and plentiful phenolic compounds such as phenol and p-hydroquinone via the cleavage of C-N and C-As bonds within 60 min in pure water. Meanwhile, although the formed lepidocrocite and magnetite on the surface of SiO2-nZVI significantly limited the reutilization, they played a vital role in the adsorption of the released As(V) and the residual arsenic levels in the effluent were as low as 0.031 mg L-1, meeting both the drinking water standard of the World Health Organization (WHO) and the surface water standard of China (0.05 mg L-1). Furthermore, high-level dissolved organic matters (DOM) (> 2 mg C L-1) exhibited strong interference with both the oxidation of p-ASA and adsorption of arsenic, but the interference could be eliminated by increasing the SiO2-nZVI dosage or adding H2O2. Importantly, this system could completely remediate p-ASA in a short time and simultaneously avoid the secondary pollution caused by inorganic arsenic, which was significant for the remediation of organoarsenic pollutants in swine wastewater.

更新日期：2020-01-26

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