Electro-sorption of ammonium ion onto nickel foam supported highly microporous activated carbon prepared from agricultural residues (dried Luffa cylindrica)

Yu Jen Shih, Cheng Di Dong, Yao Hui Huang, C. P. Huang

研究成果: Article同行評審

13 引文 斯高帕斯(Scopus)

摘要

An electrode made of loofah sponge derived activated carbon supported on nickel foam (AC/Ni) was successfully fabricated and used to remove ammonium ion (NH 4 + ) from aqueous solution. A multilayer adsorption isotherm was used to describe ammonium electro-sorption on AC/Ni electrodes at different temperature, initial NH 4 + concentration, and electrical field. The cyclic voltammetry (CV) results suggested that the electrical capacitance of AC/Ni electrodes, with the AC being prepared without preheating (OAC) or with low temperature heating (i.e., 300 AC), were higher than those prepared at high preheating temperature (i.e., 400 AC and 500 AC). Increasing the electro-sorption temperature from 10 to 50 °C decreased the monolayer NH 4 + adsorption capacity from 5 to ca. 2–3 mg-N g −1 , respectively. Background electrolyte, namely, sodium sulfate, exhibited significant competitive effect on the adsorption of ammonium ion at sodium ion concentration > 10 −2 M. The activation energy and heat of adsorption were 9–23.2 kJ mol −1 and −3.7–−10.7 kJ mol −1 , respectively, indicating a physisorption and exothermic adsorption characteristics. Based on the kinetics and thermodynamics analysis, there was slight increase in the activation energy with elevating preheating temperature, which increased the quantity of micro-pores and surface heterogeneity of the AC materials. Overall, results clearly demonstrated that carbon pyrolysis played a role on the capacitive charging behaviors of electrodes and the efficiency of NH 4 + electro-sorption on the AC/Ni electrodes.

原文English
頁(從 - 到)296-305
頁數10
期刊Science of the Total Environment
673
DOIs
出版狀態Published - 2019 七月 10

All Science Journal Classification (ASJC) codes

  • 環境工程
  • 環境化學
  • 廢物管理和處置
  • 污染

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