School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China.
School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China; Faculty of Materials Metallurgy & Chemistry, Jiangxi University of Science & Technology, Ganzhou, Jiangxi, 341000, China.
Water Res. 2021 Jul 15;200:117266. doi: 10.1016/j.watres.2021.117266. Epub 2021 May 19.
A novel catalyst (MT/EMR) used for SR-AOPs with high removal efficiency toward roxarsone (ROX) (90.96% within 60 min) was prepared for the first time by ball milling multi-walled carbon nanotubes (MWCNTs) with electrolytic manganese residue (EMR). The incorporation of MWCNTs could improve the adsorption capacity and accelerate the transformation of metals in EMR with partial mass loss to facilitate the PDS activation. Additionally, pH test, quenching experiment and electrochemical test verified a two-electron pathway involving surface activated-complex contributed to the directly ROX oxidization. Benefit from the introduction of MWCNTs, the degradation rate (k) of catalytic reaction was increased by 10.1 times compared with that of single-EMR. Additionally, the M-O-C (M=Fe or Mn) bonds in MT/EMR making the catalyst more stable than EMR. This work provided a novel and effective strategy to establish waste solid-based catalysts for green preparation and expanded the adsorption-oxidation technology to solve the problem of organoarsenic pollution.
首次通过球磨将多壁碳纳米管（MWCNTs）与电解锰渣（EMR）结合，制备了一种用于 SR-AOPs 的新型催化剂（MT/EMR），对洛克沙砷（ROX）具有高效去除效果（60 min 内去除率达到 90.96%）。MWCNTs 的掺入可以提高吸附能力，并通过部分质量损失加速 EMR 中金属的转化，从而促进 PDS 的活化。此外，pH 值测试、猝灭实验和电化学测试验证了一个涉及表面激活配合物的双电子途径，有助于直接氧化 ROX。受益于 MWCNTs 的引入，与单一 EMR 相比，催化反应的降解速率（k）提高了 10.1 倍。此外，MT/EMR 中的 M-O-C（M=Fe 或 Mn）键使催化剂比 EMR 更稳定。这项工作为基于废固的绿色制备催化剂提供了一种新颖有效的策略，并将吸附-氧化技术扩展到解决有机砷污染问题。
