文献类型：期刊文献

英文题名：Adsorption of Divalent Heavy Metal Ions from Aqueous Solution by Citric Acid Modified Pine Sawdust

作者：Zhou, Yanbo[1];Zhang, Ruzhuang[1];Gu, Xiaochen[1];Lu, Jun[1]

机构：[1]E China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, Shanghai 200237, Peoples R China

年份：2015

卷号：50

期号：2

起止页码：245

外文期刊名：SEPARATION SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20151100641658);WOS:【SCI-EXPANDED(收录号:WOS:000347544800010)】；

基金：The authors would like to express their sincere gratitude to the National Natural Science Foundation of China (51208201), China Postdoctoral Science Foundation (2011M500744) and Shanghai Educational Development Foundation (11CG32) for their financial support of this study.

语种：英文

外文关键词：modification; heavy metal ion; competitive adsorption; citric acid; pine sawdust

摘要：Removal of certain divalent heavy metal ions (Cu2+, Pb2+, and Cd2+) from aqueous solutions by citric acid modified pine sawdust (CA-PS) was investigated in this study. The contribution of the citric acid modification to the increase of adsorption capacity of metal ions is significant. In the mono-component system of Cu2+, the maximum adsorption capacity of CA-PS (0.253 mmol/g or 16.19 mg/g) is more than three times higher than that of B-PS (0.079 mmol/g or 5.06 mg/g). The adsorption kinetics and isotherm of the pretreated pine sawdust (B-PS) and CA-PS can be well elucidated with the pseudo-second order model and the Langmuir model, respectively. The competitive adsorption behavior of Cu2+, Cd2+, and Pb2+ in the binary systems (Cu2++Pb2+, Cu2++Cd2+, and Pb2++Cd2+) were studied, and the preference of adsorption onto CA-PS can be ordered as Pb2+ > Cu2+ > Cd2+. The results showed the possibility of utilizing natural bio-sorbent as cost-effective adsorbent alternative for heavy metal ions removal.