Affiliation:
1. College of Environmental Science and Engineering Hunan University Changsha 410082 China
2. Key Laboratory of Environmental Biology and Pollution Control Ministry of Education Hunan University Changsha 410082 China
Abstract
AbstractBiochar 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.
Funder
National Natural Science Foundation of China
Key Technologies Research and Development Program
Natural Science Foundation of Hunan Province
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献