Arsenite contaminated water is one of severe global environmental problems. It is challenging to treat As(III) pollution by a one-step technology. In this study, we developed a Fe(III)/CaO₂ Fenton-like technology for the treatment of As(III). The simultaneous oxidation of arsenite and removal of arsenic were achieved with efficiencies of nearly 100% and 95.8% respectively, which outperforms conventional technologies. It worked well in pH 3 to 9, and in the presence of cationic heavy metals, anions and humic acid. Moreover, the ${\text{PO}}_4^{3-}$ inhibited the removal of As(III). •OH and ¹O₂ played the important roles in the oxidation of As(III). The Ca(II) derived from CaO₂ made a significant contribution to the oxidation and removal of As(III). The SEM and XPS studies confirmed that the formation of Ca-Fe nascent colloid caused the effective removal of arsenic. Our study demonstrates that the one-step Fe(III)/CaO₂ technology has a great potential for purification of the As(III)-contaminated water.

亚砷酸盐污染的水是严重的全球环境问题之一。一步法处理As(III)污染具有挑战性。在这项研究中，我们开发了一种 Fe(III)/CaO ₂ Fenton 类技术来处理 As(III)。实现了亚砷酸盐的同时氧化和脱砷，效率分别接近100%和95.8%，优于传统技术。它在 pH 3 到 9 以及存在阳离子重金属、阴离子和腐殖酸的情况下效果很好。此外，该${\text{采购订单}}_4^{3-}$抑制 As(III) 的去除。• OH 和¹ O ₂在 As(III) 的氧化中起重要作用。CaO ₂衍生的Ca(II)对As(III)的氧化和去除做出了重大贡献。SEM 和 XPS 研究证实 Ca-Fe 新生胶体的形成导致了砷的有效去除。我们的研究表明，一步法 Fe(III)/CaO ₂技术具有净化 As(III) 污染水的巨大潜力。