A novel thermosensitive persulfate controlled-release hydrogel based on agarose/silica composite for sustained nitrobenzene degradation from groundwater

被引：10

作者：

Wu, Shuxuan ^{[1
,2
,3
]}

Deng, Sheng ^{[1
,2
,4
]}

Xia, Fu ^{[1
,2
]}

Han, Xu ^{[1
,2
]}

Ju, Tianyu ^{[1
,2
]}

Xiao, Han ^{[1
,2
]}

Xu, Xiangjian ^{[1
,2
]}

Yang, Yu ^{[1
,2
,4
]}

Jiang, Yonghai ^{[1
,2
]}

Xi, Beidou ^{[1
,2
]}

机构：

[1] Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China

[2] Chinese Res Inst Environm Sci, State Environm Protect Key Lab Simulat & Control G, Beijing 100012, Peoples R China

[3] Beijing Normal Univ, Coll Water Sci, Beijing 100875, Peoples R China

[4] Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2023年 / 445卷

基金：

中国国家自然科学基金;

关键词：

Thermosensitive; Controlled release; Persulfate; 4-DNT; Groundwater remediation; ACTIVATED PERSULFATE; OXIDATION; CANDLES; IMPACT;

D O I：

10.1016/j.jhazmat.2022.130619

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The increasing risk of organic contamination of groundwater poses a serious threat to the environment and human health, causing an urgent need to develop long-lasting and adaptable remediation materials. Controlled release materials (CRMs) are capable of encapsulating oxidants to achieve long-lasting release properties in aquifers and considered to be effective strategies in groundwater remediation. In this study, novel hydrogels (ASGs) with thermosensitive properties were prepared based on agarose and silica to achieve controlled per sulfate (PS) release. By adjusting the composition ratio, the gelation time and internal pore structure of the hydrogels were regulated for groundwater application, which in turn affected the PS encapsulated amount and release properties. The hydrogels exhibited significant temperature responsiveness, with 6.8 times faster gelation rates and 2.8 times longer controlled release ability at 10 degrees C than at 30 degrees C. The ASGs were further combined with zero-valent iron to achieve long-lasting degradation of the typical nitrobenzene compound 2,4-dinitrotoluene (2,4-DNT), and the degradation performance was maintained at 50 % within 14 PV, which was significantly improved compared with that of the PS/ZVI system. This study provided new concepts for the design of controlled-release materials and theoretical support for the remediation of organic contamination.

引用

页数：11