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Enhancement of Ball-milling on Pyrite/Zero-valent iron for Persulfate Activation on Imidacloprid Removal in Aqueous Solution: A Mechanistic Study
Journal of Environmental Chemical Engineering ( IF 7.4 ) Pub Date : 2021-05-12 , DOI: 10.1016/j.jece.2021.105647
Meimei Du , Hainan Kuang , Yongqing Zhang , Xianlin Zeng , Conghao Yi , Imtyaz Hussain , Shaobin Huang , Shuaifei Zhao

Imidacloprid (IMI) removal by persulfate (PS) oxidation activated by ball-milled FeS2/Fe0 composite was investigated in terms of reaction conditions and mechanisms. The ball-milled FeS2/Fe0 with a mass ratio of 1:9 exhibited the highest activating efficiency for PS among the investigated mass ratios of 9:1, 4:1, 1:1, 1:4 and 1:9. Increasing dosages of ball-milled FeS2/Fe0 and PS promoted IMI removal. At initial pH of 4.6 and initial IMI concentration of 0.15 mol/L, the optimal dosage of ball-milled FeS2/Fe0 and PS were 0.1 g/L and 2.5 mmol/L, respectively, removing 99.8% of IMI after 60-min reaction. The ball-milled FeS2/Fe0 could also activate PS effectively in a wide pH range from 3 to 9. Characterizations including Scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) revealed that the high activation efficiency was related to FeS produced on Fe0 surface. Activation efficiency of PS was enhanced by accelerated electron transfer mediated by increased ferrous species, ultimately, the removal efficiency of IMI was improved. The released Fe2+ activated PS to generate SO4and ·OH. SO4 was detected to be predominant reactive oxygen species in IMI degradation and three different pathways for IMI degradation were proposed. This study developed a efficient method to activate PS by FeS2 modify Fe0 prepared by ball milling a mixture of Fe0 and FeS2, which can provide some new insights into the degradation of organic pollutants.



中文翻译:

硫铁矿/零价铁的球磨增强,水溶液中吡虫啉去除过硫酸盐活化的机理研究

研究了球磨FeS 2 / Fe0复合材料活化过硫酸盐(PS)氧化去除吡虫啉(IMI)的反应条件和机理。质量比为1:9的球磨FeS 2 / Fe 0对PS的活化效率最高,为9:1、4:1、1:1、1:4和1:9。球磨FeS 2 / Fe 0和PS的剂量增加促进了IMI的去除。在初始pH值为4.6和IMI初始浓度为0.15  mol / L时,球磨FeS 2 / Fe 0和PS的最佳剂量分别为0.1  g / L和2.5  mmol / L,在60-60 ℃后去除99.8%的IMI。分钟反应。球磨FeS2 / Fe 0还可在3至9的宽pH范围内有效活化PS。表征包括扫描电子显微镜,能谱仪(SEM-EDS)和X射线光电子能谱(XPS)表明,高活化效率与在Fe 0表面产生的FeS 。通过增加亚铁物种介导的加速电子转移提高了PS的活化效率,最终提高了IMI的去除效率。释放的Fe 2+活化了PS,生成SO 4- ·和·OH。SO 4- ·被发现是IMI降解的主要活性氧种类,并提出了三种不同的IMI降解途径。这项研究开发了一种有效的方法,该方法可以通过FeS 2改性通过球磨Fe 0和FeS 2的混合物制备的Fe 0来活化PS ,这可以为降解有机污染物提供一些新的见解。

更新日期:2021-05-12
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