The simultaneous removal of roxarsone (ROX) and inorganic arsenic was achieved by designing a heterogeneous catalytic system. In this study, iron-rich heating pad waste (HPW) was modified by ball milling (BM), and a BM-HPW activated peroxymonosulfate (PMS) system was constructed to control ROX pollution. Results show that during the ball milling process, Fe0 and Fe3O4 crystalline phases were formed, and the surface area of the material got improved. BM-HPW/PMS system performed effectively in ROX degradation and inorganic arsenic adsorption. Sulfate radical (SO4−), surface-bound species, singlet oxygen (1O2) and Fe(IV) were generated in the BM-HPW/PMS system, and the surface-bound species played a dominant role in ROX degradation. In addition, the possible degradation pathways of ROX were proposed according to the detected intermediates. This study adopted a green and environmentally-friendly mechanochemical method to achieve the recycle application of waste iron resources, which provides a new insight for PMS activation in water treatment.

中文翻译：

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使用球磨加热垫废物激活过一硫酸盐增强洛克沙胂和无机砷的去除：非自由基途径的关键作用


通过设计多相催化体系实现了洛克沙胂（ROX）和无机砷的同时去除。本研究通过球磨（BM）对富铁加热垫废料（HPW）进行改性，并构建了BM-HPW活化过一硫酸盐（PMS）系统来控制ROX污染。结果表明，球磨过程中形成了Fe0和Fe3O4晶相，材料的表面积得到提高。 BM-HPW/PMS系统在ROX降解和无机砷吸附方面表现良好。 BM-HPW/PMS 系统中产生硫酸根 (SO4−)、表面结合物质、单线态氧 (1O2) 和 Fe(IV)，并且表面结合物质在 ROX 降解中起主导作用。此外，根据检测到的中间体提出了ROX可能的降解途径。本研究采用绿色环保的机械化学方法实现了废铁资源的循环利用，为PMS活化在水处理中的应用提供了新的思路。