标题：Removal of Cu(II) ions from aqueous solution by activated carbon impregnated with humic acid
作者：Liu, Hanchao; Feng, Suping; Zhang, Nannan; Du, Xiaolin; Liu, Yongli
作者机构：[Liu Hanchao] School of Environmental Science and Engineering, Shandong University, Shandong Key Laboratory of Water Pollution Control and Resource Re 更多
通讯作者地址：[Feng, SP]Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource, Jinan 250100, Peoples R China.
关键词：adsorption; humic acid; activated carbon; heavy metal ions
摘要：Humic acid (HA) was impregnated onto powdered activated carbon to improve its Cu(II) adsorption capability. The optimum pH value for Cu(II) removal was 6. The maximum adsorption capacity of HA-impregnated activated carbon was up to 5.98 mg center dot g(-1), which is five times the capacity of virgin activated carbon. The adsorption processes were rapid and accompanied by changes in pH. In using a linear method, it was determined that the equilibrium experimental data were better represented by the Langmuir isotherm than by the Freundlich isotherm. Surface charges and surface functional groups were studied through zeta potential and FTIR measurements to explain the mechanism behind the humicacid modification that enhanced the Cu(II) adsorption capacity of activated carbon.