吸附
化学
电容去离子
钒
弗伦德利希方程
朗缪尔
选择性吸附
水溶液中的金属离子
无机化学
朗缪尔吸附模型
化学工程
离子
电极
电化学
有机化学
物理化学
工程类
作者
Dexi Liu,Shichang Xu,Yanmeng Cai,Yue Wang,Jiaqi Guo,Youlin Li
标识
DOI:10.1016/j.jelechem.2022.116152
摘要
The conventional separation technologies, like chemical precipitation and adsorption processes, cannot quickly and selectively separate and recycle heavy metal ions from waste. Due to its rich sulfur content and excellent electrical conductivity, vanadium disulfide is a potential material for effectively removing lead from wastewater. The vanadium disulfide material with selective adsorption ability was introduced into CDI technology to construct a coupling technology with both advantages. The N-doped modified [email protected] disulfide ([email protected]2) composites were successfully synthesized by hydrothermal method. Electrosorption experiments show that [email protected]2 material presents the remarkable saturated adsorption capacity to lead(II) ions (239.52 mg/g) in the 500 mg/L PbCl2 solution. In the triplex blend system (Fe3+/Pb2+/Na+) with each solute density of 100 mg/L, the saturated adsorption efficiency of 85.4% to Pb2+ can still be maintained. In addition, compared with the Langmuir(R2=0.873) adsorption isotherm model, the Freundlich model (R2=0.922) can be better used to fit the adsorption process, which proves that the adsorption process is multilayered and heterogeneous. XPS tests and competitive adsorption experiments show that the electric double layer (EDL) and complexation together promote the selective adsorption of heavy metal ions by [email protected]2. [email protected]2 composite electrode shows excellent performance in the removal of lead ions in battery waste liquid, indicating the potential of introducing [email protected]2 into CDI to remove lead ions.
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