标题：Highly-Efficiency adsorption of hexavalent chromium on low rank coals
作者：Zou, Xing-yun ;Li, Lin ;You, Xiao-fang ;Wang, Peng ;Qiu, Jun ;Wang, Jun-xiang ;Cao, Xiao-qiang ;Sun, Wei-ling ;Zhang, Qing-jian ;Lyu, Xian-jun
作者机构：[Zou, Xing-yun ;Li, Lin ;You, Xiao-fang ;Wang, Peng ;Qiu, Jun ;Wang, Jun-xiang ;Cao, Xiao-qiang ;Lyu, Xian-jun ] College of Chemical and Environmental 更多
会议名称：35th Annual International Pittsburgh Coal Conference, PCC 2018
会议日期：15 October 2018 through 18 October 2018
来源：2018 International Pittsburgh Coal Conference, PCC 2018
关键词：Adsorption; Heavy metal; Hexavalent chromium; Low rank coals; Mechanism
摘要：In this study, low rank coals (LRCs) were evaluated as a potential lower-cost materials for the removal of Cr(VI) ions from aqueous solutions. The effect of initial solution concentration, adsorbent dosage, pH on the adsorption of Cr(VI) by LRCs were investigated by batch experiments. The results indicated that LRCs can adsorb Cr(VI) efficiently, and the maximum adsorption capacity of 43.066 mg/g can be obtained. The remove efficiency (RE) of Cr(VI) increases with an increase in LRCs dosage. In contrast, the remove efficiency (RE) decrease with an increase in the pH, and RE decreases sharply from 99% to 18% at pH >2. The adsorption of Cr(VI) on LRCs significant decrease with an increase in the Cl- ionic strength. The Freundlich isotherm model and pseudo-second-order kinetics can describe the isotherm and kinetics data, respectively. The results of the thermodynamics analysis showed that the adsorption is endothermic. Copyright © 2018 Pittsburgh Coal Conference.