Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China.
College of Geography and Environment, Shandong Normal University, Jinan 250300, China.
Int J Environ Res Public Health. 2023 Mar 10;20(6):4883. doi: 10.3390/ijerph20064883.
The use of natural pyrite as a catalyst for the treatment of recalcitrant organic wastewater by an electro-Fenton system (pyrite-EF) has recently received extensive attention. To improve the catalytic activity of natural pyrite (Py), magnetic pyrite (MPy), and pyrrhotite (Pyr), they were obtained by heat treatment, and the nanoparticles were obtained by ball milling. They were characterized by X-ray diffraction, X-ray electron spectroscopy, and scanning electron microscopy. The degradation performance of rhodamine B (Rhb) by heterogeneous catalysts was tested under the pyrite-EF system. The effects of optimal pH, catalyst concentration, and current density on mineralization rate and mineralization current efficiency were explored. The results showed that the heat treatment caused the phase transformation of pyrite and increased the relative content of ferrous ions. The catalytic performance was MPy > Py > Pyr, and the Rhb degradation process conformed to pseudo-first-order kinetics. Under the optimum conditions of 1 g L MPy, an initial pH of five, and a current density of 30 mA cm, the degradation rate and TOC removal rate of Rhb wastewater reached 98.25% and 77.06%, respectively. After five cycles of recycling, the chemical activity of MPy was still higher than that of pretreated Py. The main contribution to Rhb degradation in the system was •OH radical, followed by SO4•-, and the possible catalytic mechanism of MPy catalyst in the pyrite-EF system was proposed.
天然黄铁矿作为电芬顿系统（pyrite-EF）处理难降解有机废水的催化剂，近年来受到广泛关注。为了提高天然黄铁矿（Py）、磁黄铁矿（MPy）和磁黄铁矿（Pyr）的催化活性，通过热处理获得，通过球磨获得纳米颗粒。采用 X 射线衍射、X 射线电子能谱和扫描电子显微镜对其进行了表征。在 pyrite-EF 体系下，用非均相催化剂测试了罗丹明 B（Rhb）的降解性能。探讨了最佳 pH 值、催化剂浓度和电流密度对矿化率和矿化电流效率的影响。结果表明，热处理导致黄铁矿相转变，增加了二价铁离子的相对含量。催化性能为 MPy＞Py＞Pyr，Rhb 降解过程符合准一级动力学。在 1 g L MPy、初始 pH 值为 5 和电流密度为 30 mA cm 的最佳条件下，Rhb 废水的降解率和 TOC 去除率分别达到 98.25%和 77.06%。经过五次循环回收，MPy 的化学活性仍高于预处理的 Py。该体系中 Rhb 降解的主要贡献是•OH 自由基，其次是 SO4•-，并提出了 MPy 催化剂在 pyrite-EF 体系中的可能催化机制。
Zotero 插件
