Enhancement of ball-milling on pyrite/zero-valent iron for persulfate activation on imidacloprid removal in aqueous solution: A mechanistic study

被引：20

作者：

Du, Meimei ^{[1
]}

Kuang, Hainan ^{[1
]}

Zhang, Yongqing ^{[1
,2
]}

Zeng, Xianlin ^{[1
]}

Yi, Conghao ^{[1
]}

Hussain, Imtyaz ^{[1
]}

Huang, Shaobin ^{[1
]}

Zhao, Shuaifei ^{[3
]}

机构：

[1] South China Univ Technol, Sch Environm & Energy, Guangdong Prov Key Lab Atmospher Environm & Pollu, Guangzhou 510006, Peoples R China

[2] Minist Educ, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Guangzhou 510006, Peoples R China

[3] Deakin Univ, Inst Frontier Mat, Geelong, Vic 3216, Australia

来源：

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING | 2021年 / 9卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Zero-valent iron; Ball-milled FeS2/Fe-0; Imidacloprid; FeS; Electron transfer; P-CHLOROANILINE; ZEROVALENT IRON; DEGRADATION; PEROXYMONOSULFATE; OXIDATION; FENTON; WATER; PHOTOCATALYSIS; SULFIDATION; EXTRACTION;

D O I：

10.1016/j.jece.2021.105647

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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/Fe-0 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/Fe-0 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/Fe-0 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/Fe-0 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 Fe-0 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 SO(4)(-center dot)and center dot OH. SO4-center dot 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 Fe-0 prepared by ball milling a mixture of Fe-0 and FeS2, which can provide some new insights into the degradation of organic pollutants.

引用

页数：12

共 54 条

[11] Application of peroxymonosulfate and its activation methods for degradation of environmental organic pollutants: Review [J].