Recycling supercapacitor activated carbons for adsorption of silver (I) and chromium (VI) ions from aqueous solutions
文献类型： 外文期刊
作者： Wu, Feng 1 ; Zhao, Tuo 1 ; Yao, Ying 1 ; Jiang, Tao 2 ; Wang, Bing 1 ; Wang, Meiling 1 ;
作者机构： 1.Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China
2.Southwest Univ, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Chongqing Key Lab Agr Resources & Environm, Coll Resources & Environm,Minist Educ,Dept Enviro, Chongqing 400716, Peoples R China
关键词： Heavy metals; Spent supercapacitor; Adsorption; Wastewater treatment; Activated carbon
期刊名称：CHEMOSPHERE （ 影响因子：8.1； 五年影响因子：7.7 ）
ISSN： 0045-6535
年卷期： 2020 年 238 卷
页码：
收录情况： SCI
摘要： In this study, we reported on the recycling of carbon materials from spent commercial supercapacitors and its application as low-cost adsorbent for high-efficiency removal of Ag(I) and Cr(VI) ions from aqueous solutions. Adsorption kinetics and isotherms, and effects of initial pH were carried out to investigate the adsorption performance of the recycled supercapacitor activated carbon (RSAC), whereas a series of characterizations such as SEM, EDX, BET, XPS, XRD and FTIR were employed to detailedly analyse the adsorption mechanism. The RSAC showed maximal adsorption capacity for Ag(I) and Cr(VI) of 104.0 and 96.3 mg g(-1), respectively, with adsorbent dosage of 2 g L-1 and initial ions concentration of similar to 2000 mg L-1 at room temperature (23 +/- 1 degrees C), and the adsorption was rapid and influenced by the initial pH value. The outstanding adsorption performance of RSAC was attributed to the high specific surface area (1403 m(2) g(-1)) and abundant multifarious oxygenic groups which could participate in the electrostatic attraction and reduction reaction of Ag(I) and Cr(VI) during the adsorption process. Furthermore, the predominate species of the adsorbed toxic Ag(I) and Cr(VI) on the surface of RSAC was metallic silver particle (about 2 mu m) and harmless Cr(III), respectively, thus it was possible for further recycling and disposal. (C) 2019 Elsevier Ltd. All rights reserved.
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