Uptake of heavy metal cations by chitosan-modified montmorillonite: Kinetics and equilibrium studies
Uptake of heavy metal cations by chitosan-modified montmorillonite: Kinetics and equilibrium studies
复制标题
壳聚糖改性蒙脱土对重金属阳离子的吸收：动力学和平衡研究
DOI：
10.1016/j.matchemphys.2019.121784
复制
发表时间：
2019
影响因子：
4.6
通讯作者：
T. Yoshioka
中科院分区：
文献类型：
--
作者：
T. Kameda;Reina Honda;S. Kumagai;Yuko Saito;T. Yoshioka
研究了壳聚糖改性蒙脱土（cts改性）对Cu2+和Ni2+的吸附性能。动力学分析表明，MMT、CTS和CTS修饰的MMT对Cu2+和Ni2+的吸附可以用拟二阶动力学方程来模拟。吸附等温线清楚地表明吸附符合Langmuir方程。CTS修饰的MMT对金属阳离子的吸附被认为是由于MMT的阳离子吸附能力和CTS与金属离子形成配合物的能力。还进行了解吸和再吸附实验，以确定合成的吸附剂重复使用的可能性。使用100 mmol/L的hno3溶液，cts修饰的MMT的解吸率约为90%。解吸后得到的cts改性MMT的吸附效果与新鲜的cts改性MMT相同，表明该吸附剂可重复使用。
The adsorption of Cu2+and Ni2+by chitosan-modified montmorillonite (CTS-modified MMT) was investigated. Kinetic analyses suggested that the adsorption of Cu2+and Ni2+by MMT, CTS, and CTS-modified MMT can be modeled using a pseudo-second-order kinetic equation. The adsorption isotherms clearly indicate that the adsorption follows the Langmuir equation. The adsorption of metal cations by CTS-modified MMT is thought to be attributable to the cation adsorption capacity of MMT and the ability of CTS to form complexes with metal ions. Desorption and re-adsorption experiments were also conducted to determine the possibility of reusing the synthesized adsorbent. Using a 100-mmol/L HNO3solution, a desorption rate of approximately 90% was achieved for the CTS-modified MMT. The CTS-modified MMT obtained after desorption could achieve the same level of adsorption as fresh the CTS-modified MMT, indicating that this adsorbent can be reused.