Enhancing peroxymonosulfate activation of Fe-Al layered double hydroxide by dissolved organic matter: Performance and mechanism

被引：90

作者：

Ye, Quanyun ^{[1
]}

Wu, Jiayan ^{[1
]}

Wu, Pingxiao ^{[1
,2
,3
,4
,5
]}

Wang, Jinxin ^{[1
]}

Niu, Wenchao ^{[1
]}

Yang, Shanshan ^{[1
]}

Chen, Meiqing ^{[1
]}

Rehman, Saeed ^{[1
]}

Zhu, Nengwu ^{[1
,2
]}

机构：

[1] South China Univ Technol, Guangzhou Higher Educ Mega Ctr, Sch Environm & Energy, Guangzhou 510006, Peoples R China

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

[3] South China Univ Technol, Guangdong Prov Engn & Technol Res Ctr Environm Ri, Guangzhou Higher Educ Mega Ctr, Guangzhou 510006, Peoples R China

[4] Guangdong Prov Key Lab Solid Wastes Pollut Contro, Guangzhou 510006, Peoples R China

[5] Guangdong Engn & Technol Res Ctr Environm Nanomat, Guangzhou 510006, Peoples R China

来源：

WATER RESEARCH | 2020年 / 185卷

基金：

中国国家自然科学基金;

关键词：

Dissolved organic matter; Layered double hydroxide; Peroxymonosulfate; REVERSIBLE REDOX SITES; ADVANCED OXIDATION; BISPHENOL-A; WATER TREATMENT; SINGLET OXYGEN; DEGRADATION; PERSULFATE; REMOVAL; BIOCHAR; FE(II)/PEROXYMONOSULFATE;

D O I：

10.1016/j.watres.2020.116246

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this study, peroxymonosulfate (PMS) activation of FeAl layered double hydroxide (FeAl-LDH) was enhanced by compounding dissolved organic matter (DOM). The characterization and catalytic performance of FeAl-LDH and DOM-LDH were investigated. The results revealed that the physicochemical properties of DOM-LDH were superior to FeAl-LDH: (i) The higher proportion of Fe(II) was found in DOM-LDH, mainly existed in the form of trans-coordinated octahedral Fe(II); (ii) DOM-LDH showed a flower-like morphology with larger specific surface area, pore width and pore volume; (iii) More functional groups and surface oxygen vacancies were found in DOM-LDH. Moreover, DOM promoted the process of PMS activation by accelerating Fe(III) reduction with humic acid-like compounds. The results of electron paramagnetic resonance (EPR) and quenching experiments indicated that more reactive oxygen species (ROS) were generated in DOM-LDH/PMS system, center dot OH was considered as the dominant ROS for Bisphenol A (BPA) degradation. As a result, the degradation efficiency for BPA (20 mg L-1) in FeAl-LDH/PMS system was increased from 60% to 93% within 60 min after the introduction of DOM. This work is expected to facilitate the design and application of Fe(II)/PMS system for environmental protection. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：11