The UV/permanganate process is an innovative advanced oxidation process (AOP) that generates oxidative species, such as hydroxyl radicals (HO^•) and reactive manganese species (RMnS), and adsorptive species of in situ formed MnO₂. The cooperation of oxidation and adsorption has the potential to remove organic metals from water. Herein, the removal of organoarsenic compounds of roxarsone and p-arsanilic acid by UV/permanganate was investigated. The pseudo-first-order reaction rate (k_ox′) of roxarsone was 0.0375 min^–1 at a permanganate dose of 100 μM and pH 7.0 in the UV/permanganate process, which was mainly attributable to HO^•. The transformation of roxarsone was initiated with a HO^• attack on the C–As bond, releasing As(V), which was then removed from the aqueous phase by MnO₂ adsorption. Additionally, hydroxylated products were generated by HO^• oxidation and subsequently oxidized into nitro-1,4-benzoquinone and ring cleavage products. Under neutral conditions, the removal rate of total arsenic reached 73% at 20 min, 50% of roxarsone was transferred to As(V) via oxidation, and the in situ formed MnO₂ could remove 78% of the remaining roxarsone and 70% of As(V) via adsorption. With an increase in the pH from 3.0 to 9.0, the k_ox′ of oxidation decreased by 68%, whereas the removal rate of total arsenic increased from just 20% to 73%. This is the first study to use the UV/permanganate process to completely remove organic heavy metals with the combination of oxidative and adsorptive species, which demonstrates that this process is promising in water treatment.

中文翻译：

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通过HO ^•氧化和原位形成的二氧化锰吸附，通过UV /高锰酸盐工艺完全去除有机砷

UV /高锰酸盐工艺是一种创新的高级氧化工艺（AOP），它可以产生氧化性物质，例如羟基自由基（HO ^•）和反应性锰物质（RMnS），以及原位形成的MnO ₂吸附性物质。氧化和吸附的协同作用具有从水中去除有机金属的潜力。在此，研究了通过UV /高锰酸盐去除罗沙酮和对砷酸的有机砷化合物。在高锰酸盐剂量为100μM，pH为7.0的高锰酸盐过程中，roxarsone的拟一级反应速率（k _ox '）为0.0375 min ^–1，这主要归因于HO ^•。洛克沙胂的转化用HO发起^•在C-作为键攻击，释放的As（V），然后将其从由MnO的水相中除去₂吸附。此外，羟化产物通过HO ^•氧化生成，随后被氧化为硝基-1,4-苯醌和环裂解产物。在中性条件下，20分钟时总砷的去除率达到73％，50％的洛沙酮通过氧化转移到As（V）中，原位形成的MnO ₂可以去除78％的剩余洛沙酮和70％的洛沙酮。通过吸附的As（V）。从3.0到9.0的增加pH值，ķ_牛氧化'降低了68％，而总砷的去除率仅从20％增加到73％。这是第一项使用紫外线/高锰酸盐工艺完全去除有机重金属并结合氧化和吸附物种的研究，这表明该工艺在水处理中很有前途。