黄铁矿
化学
X射线光电子能谱
硫黄
硫化物
多硫化物
无机化学
激进的
催化作用
电子顺磁共振
过氧化氢
矿物学
化学工程
有机化学
物理化学
工程类
物理
电解质
核磁共振
电极
作者
Linghui Zhao,Yufan Chen,Yanxia Liu,Cong Luo,Deli Wu
出处
期刊:Chemosphere
[Elsevier]
日期:2017-12-01
卷期号:188: 557-566
被引量:71
标识
DOI:10.1016/j.chemosphere.2017.09.019
摘要
The Fenton-like reactions catalyzed by pyrite can efficiently degrade organic contaminants by oxidation process. When chloramphenicol (CAP) was exposed to the pyrite-H2O2 system, the CAP removal rate rapidly reached 100% however slowed to a halt at alkaline conditions. Results indicated that by adding S(-II) in pyrite-H2O2 system improved the oxidation efficiency of CAP at alkaline conditions. The transformation of S22- and Sn2- observed by X-ray photoelectron spectroscopy (XPS), confirmed that amorphous iron polysulfide (FeSn) was freshly generated on the pyrite surface. The availability of S(-II) promoted the generation of FeSn. Besides, S(-II) played a role in accelerating the Fe(III)/Fe(II) cycles. The potential of S(-II) activating H2O2 to generate hydroxyl radicals (OH), which was confirmed by electron spin resonance (ESR) spectroscopy, quenching experiments, and trapping experiments, have supported the proposed mechanisms. This study came up with an efficient way of enhancing Fenton-like reactions by pyrite catalyzed at alkaline conditions, by adding S(-II) in the system. The new findings have implications for sulfide minerals, their interactions with pollutants, and the transformation products of sulfur in systems where Fe species are also present.
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