Hunan International Scientific and Technological Cooperation Base of Agricultural Typical Pollution Remediation and Wetland Protection, College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China.
Hunan International Scientific and Technological Cooperation Base of Agricultural Typical Pollution Remediation and Wetland Protection, College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China.
J Hazard Mater. 2020 Nov 15;399:123032. doi: 10.1016/j.jhazmat.2020.123032. Epub 2020 May 27.
In this study, magnetic material based reduced graphene oxide (M-rGO) was prepared through co-precipitation and displayed high catalytic efficiency together with persulfate (PS) for simultaneous p-arsanilic acid (p-ASA) decomposition and arsenic removal. Linear sweep voltammetry and chronoamperometric measurements with M-rGO revealed that PS was effectively bound to M-rGO surface and probably formed charge transfer complex, in which M-rGO was pivotal in mediating facile electron transfer. The effects of pH, temperatures, anions, p-ASA concentration, PS, and M-rGO dosages on p-ASA decomposition were studied in the system. Excellent degradation of p-ASA was carried out at a wide range of pH values, which was unattainable by other Fenton-like processes. Under optimal conditions, M-rGO exhibited prominent removal of both p-ASA (98.8 %) and inorganic arsenic (89.8 %). M-rGO had reasonably excellent repeatability and stability, and 77.7 % p-ASA degraded in the third recovered catalyst. The advantages of environmental friendliness, short reaction time, and straightforward synthesis of M-rGO will facilitate the development of heterogeneous Fenton-like catalysts under neutral conditions.
在这项研究中，通过共沉淀法制备了基于磁性材料的还原氧化石墨烯（M-rGO），并与过硫酸盐（PS）一起显示出高催化效率，可同时实现对对氨基苯砷酸（p-ASA）的分解和砷的去除。使用 M-rGO 的线性扫描伏安法和计时电流测量表明，PS 有效地结合到 M-rGO 表面上，并且可能形成电荷转移复合物，其中 M-rGO 在介导易于电子转移方面起着关键作用。在该体系中研究了 pH 值、温度、阴离子、p-ASA 浓度、PS 和 M-rGO 用量对 p-ASA 分解的影响。在很宽的 pH 值范围内都能实现对 p-ASA 的良好降解，这是其他类 Fenton 过程无法达到的。在最佳条件下，M-rGO 对 p-ASA（98.8%）和无机砷（89.8%）的去除效果显著。M-rGO 具有合理的优异的重复性和稳定性，在第三次回收的催化剂中，有 77.7%的 p-ASA 被降解。M-rGO 的环境友好性、短反应时间和简单的合成优势将促进中性条件下异相类 Fenton 催化剂的发展。
