Electrochemically enhanced removal of perfluorinated compounds (PFCs) from aqueous solution by CNTs-graphene composite electrode

被引：59

作者：

Niu, Zhijuan ^{[1
]}

Wang, Yujuan ^{[1
]}

Lin, Hui ^{[1
]}

Jin, Fangyuan ^{[1
]}

Li, Yang ^{[1
]}

Niu, Junfeng ^{[1
,2
]}

机构：

[1] Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China

[2] Dongguan Univ Technol, Sch Environm & Civil Engn, Dongguan 523808, Guangdong, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2017年 / 328卷

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

Electrosorption; Perfluorinated compounds (PFCs); Carbon nanotubes; Graphene; Activated carbon fiber; PERFLUOROOCTANE SULFONATE PFOS; ACTIVATED CARBON-FIBER; PERFLUOROALKYL SUBSTANCES; PERFLUOROCARBOXYLIC ACIDS; CAPACITIVE DEIONIZATION; ADSORPTION; DESALINATION; WATER; ELECTROADSORPTION; ELECTROSORPTION;

D O I：

10.1016/j.cej.2017.07.033

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Electrochemical removal of environmentally persistent perfluorinated compounds (PFCs) from aqueous solution by Ti/activated carbon fiber (ACF), Ti/Ebonex/carbon nanotubes (CNTs), and CNTs-graphene composite electrode was investigated. The results indicated that the CNTs with 20 wt% graphene (CNTs-20% graphene composite electrode) exhibited the optimal capacitive behavior and electrochemical property for the removal of perfluorooctanoate (PFOA) from aqueous solution. The removal ratio and sorption capacity of PFOA on CNTs-20% graphene electrode were 96.9% and 2421.7 mu g g(-1) after 4 h of electrosorption, respectively. The sorption equilibriums of PFOA and perfluorooctane sulfonate (PFOS) by CNTs-20% graphene electrode were approximately 4.0 h and 2.0 h, respectively. The electrosorption rates were 9.7 times (PFOA) and 12.7 times (PFOS) higher than those by powder CNTs-20% graphene composite material, respectively. The maximal sorption capacities of PFOA and PFOS on CNTs-20% graphene electrode were 491.9 mg g(-1) and 555.8 mg g(-1), respectively. The results indicated that the incorporation of graphene into CNTs could effectively enhance the electrochemical removal of PFCs from aqueous solution. These results provide an effective and alternative method to remove PFCs from wastewater with low energy consumption and mild experimental conditions. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：228 / 235

页数：8

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