生物炭
锌
电极
废水
电容感应
电容去离子
材料科学
电化学
环境化学
废物管理
化学
环境科学
冶金
环境工程
热解
电气工程
物理化学
工程类
作者
Yangfeng Wu,Haopeng Feng,Jing Tang,Zhenhao Yang,Chenrui Lan,Yuyao Guo,Lin Tang
出处
期刊:Small
[Wiley]
日期:2024-02-13
被引量:1
标识
DOI:10.1002/smll.202311401
摘要
Biochar materials have shown great potential for broad catalytic application. However, using these materials in the capacitive deionization technology (CDI) system for heavy metal removal still faces a significant challenge due to their low specific capacity and removal capability. Here, a comprehensive regulation on the interfacial/bulk electrochemistry of biochar by Zn doping is reported, which suggests a high renewable capacity (20 mg g-1 ) and outstanding selective capacitive removal ability (SCR) of Pb2+ from leachate. The SCR efficiency of Pb2+ is as high as 99% compared to K+ (8%), Na+ (13%), and Cd2+ (37%). This work proves that the doped Zn on the biochar can combine with OH- generated by water splitting to form M─OH bonds, which is beneficial for improving the specific capacity. Significantly, the relationship between double-layer capacitance and pseudo-capacitance can also be optimized by regulating the content of Zn, leading to different removal abilities of heavy metals. Therefore, this work offers insights into charge-storage kinetics, which provide valuable guidelines for designing and optimizing the biochar electrode for broader environmental applications.
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