Removal of Cu(II) and Cr(VI) from wastewater by an amphoteric sorbent based on cellulose-rich biomass.
Removal of Cu(II) and Cr(VI) from wastewater by an amphoteric sorbent based on cellulose-rich biomass.
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DOI：
10.1016/j.carbpol.2014.05.043
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发表时间：
2014-10
影响因子：
11.2
通讯作者：
Qianqian Zhong;Q. Yue;Qian Li;B. Gao;Xing Xu
中科院分区：
文献类型：
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作者：
Qianqian Zhong;Q. Yue;Qian Li;B. Gao;Xing Xu
将富含纤维素的生物质改性为新型两性吸附剂，用于去除废水中有毒的Cu（II）和Cr（VI）。与未改性小麦和其他类似样品相比，该产品（WSCA，其代表含有阳离子和阴离子特征的改性小麦秸秆）对这两种离子表现出高的吸附容量。在间歇过程中进行了动力学数据和吸附平衡等温线。吸附动力学分析表明，在整个吸附过程中，Cu（II）和Cr（VI）的吸附符合准二级动力学模型。Cu（II）的吸附等温线符合Langmuir方程，Cr（VI）的吸附等温线符合Freundlich方程。静态实验结果表明，Cr（VI）/Cu（II）和WSCA之间的复杂的相互作用，包括络合和/或静电吸引机制。
A cellulose-rich biomass was modified as a new amphoteric sorbent to eliminate toxic Cu(II) and Cr(VI) from wastewater. The product (WSCA, which stands for modified wheat straw containing both cationic and anionic characters) presents high sorption capacities for the two ions which was evidenced by the comparison with unmodified wheat and other similar samples. Kinetic data and sorption equilibrium isotherms were conducted in batch process. The sorption kinetic analysis revealed that sorption of Cu(II) and Cr(VI) followed the pseudo second-order model well during the whole sorption process. The linear Langmuir isotherm model could perfectly describe the equilibrium data for Cu(II), while the sorption data of Cr(VI) were well fitted by the Freundlich. Results of the static test illustrated the complicated interactions between Cr(VI)/Cu(II) and WSCA including complexation and/or electrostatic attraction mechanisms.