Reduction of chlorendic acid by zero-valent iron: Kinetics, products, and pathways

被引：7

作者：

Kim, Min Sik ^{[1
]}

Piggott, Emily ^{[2
]}

Zrinyi, Nick ^{[2
]}

Lee, Changha ^{[1
]}

Anh Le-Tuan Pham ^{[3
]}

机构：

[1] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul, South Korea

[2] Carleton Univ, Dept Civil & Environm Engn, Ottawa, ON, Canada

[3] Univ Waterloo, Dept Civil & Environm Engn, Waterloo, ON, Canada

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2020年 / 384卷 / 384期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Chlorendic acid; Zero-valent iron; Reductive dechlorination; Remediation; Hazardous waste; CHLORINATED METHANES; NITRATE REDUCTION; GRANULAR IRON; DECHLORINATION; SURFACE; DEGRADATION; REACTIVITY; REMOVAL; COMPLEXATION; GROUNDWATER;

D O I：

10.1016/j.jhazmat.2019.121269

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Chlorendic acid (CA) is a recalcitrant groundwater contaminant for which an effective treatment technology does not currently exist. In this study, a series of batch experiments were conducted to investigate the treatment of CA by zero-valent iron (ZVI) under various water chemistry conditions. It was observed that CA was removed by ZVI via both adsorption and degradation, with the degradation rate being proportional to the fraction of CA adsorbed onto ZVI. The rate of CA degradation decreased as pH increased, presumably due to the passivation of ZVI and diminishing CA adsorption. Chloride (Cl-) did not appreciably affect CA adsorption and degradation, while sulfate (SO42-) significantly inhibited both processes because SO42- competed with CA for ZVI adsorptive sites. The rate of CA degradation was significantly accelerated by ZVI-associated Fe(II). Nine byproducts of CA transformation were identified by high-resolution mass spectrometry. The formation and subsequent degradation of these products revealed that the transformation of CA by ZVI occurred via a step-wise reductive dechlorination pathway. Overall, this study suggests that ZVI may be effective at remediating CA-contaminated sites.

引用

页数：7

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