研究了竹炭/壳聚糖复合吸附剂吸附银(I)的动力学和热力学,并进行了银的回收实验。动力学实验表明,复合吸附剂对银(I)的吸附符合准一级动力学方程,测定不同温度下复合吸附剂对银(I)吸附的表观速率常数,得到表观活化能Ea=29.2 k J/mol;热力学研究表明,复合吸附剂对银(I)的吸附符合Langmuir等温吸附方程,测得吸附热?H为40.8 k J/mol,说明复合吸附剂对银(I)的吸附过程为吸热过程,吸附过程主要为化学吸附,吉布斯自由能?G<0,表明吸附质从溶液到吸附剂表面的吸附过程是自发过程。吸附回收实验表明:竹炭/壳聚糖复合吸附剂能应用于银的回收。
【英文摘要】
The kinetic and the thermodynamic parameters were studied for adsorption of the complex absorbent of bamboo charcoal/chitosan(BCCTS) for silver(I) in aqueous solution. And the recovery tests of silver(I) were also studied. Results of kinetics showed that adsorption of the BCCTS for silver(I) can deal with pseudo first-order reaction with the apparent adsorption activation energy of Ea=29.2 k J/mol. The apparent adsorption rate constants and activated energy were determined at different temperature. Results ...
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