Liu Tong, Chen Nan, Deng Yang, Chen Fangxin, Feng Chuanping
MOE Key Laboratory of Groundwater Circulation and Evolution, China University of Geosciences (Beijing) No. 29 Xueyuan Road, Haidian District Beijing 100083 P. R. China
School of Water Resources and Environment, China University of Geosciences (Beijing) No. 29 Xueyuan Road, Haidian District Beijing 100083 P. R. China.
RSC Adv. 2020 Apr 22;10(27):15901-15912. doi: 10.1039/d0ra01177k. eCollection 2020 Apr 21.
Pyrite (FeS) catalyzed conversion of HO into oxidants is increasingly recognized as a promising Fenton-like process for treating recalcitrant contaminants. However, the underlying mechanism remains unclear, especially for nano-pyrite. The present study explored the potential of a nano-pyrite Fenton system for -nitrophenol oxidation using high energy ball milled nano-pyrite. The enhancement in ˙OH production, with 3 times faster -nitrophenol degradation than the conventional Fenton system, is ascribed to the reduction of pyrite size to the nanoscale, which alters the Fe regeneration pathway, favoring faster and very efficient production of ˙OH during HO decomposition. The amount of HO required was reduced due to the increased conversion efficiency of HO to ˙OH from 13.90% (conventional Fenton) to 67.55%, in which surface S species served as an electron source. An interpretation of the degradation intermediates and mineralization pathway of -nitrophenol was then made using gas chromatography-mass spectrometry. This study bridges the knowledge gap between -nitrophenol removal and the nano-pyrite catalyzed oxidant generation process.
黄铁矿（FeS）催化将HO转化为氧化剂，作为一种处理难降解污染物的类芬顿工艺，越来越受到认可。然而，其潜在机制仍不清楚，尤其是对于纳米黄铁矿而言。本研究利用高能球磨纳米黄铁矿探索了纳米黄铁矿芬顿体系氧化对硝基苯酚的潜力。与传统芬顿体系相比，羟基自由基（˙OH）生成量增加，对硝基苯酚降解速度快3倍，这归因于黄铁矿尺寸减小至纳米级，改变了铁的再生途径，有利于在HO分解过程中更快且高效地生成˙OH。由于HO转化为˙OH的效率从13.90%（传统芬顿）提高到67.55%，所需HO的量减少，其中表面S物种作为电子源。然后利用气相色谱 - 质谱法对硝基苯酚的降解中间体和矿化途径进行了解析。本研究填补了对硝基苯酚去除与纳米黄铁矿催化氧化剂生成过程之间的知识空白。
