Adsorption kinetic and desorption studies of Cu2+ on Multi-Carboxylic-Functionalized Silica Gel

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Li, Min^1 ; Meng, Xiaojing^1 ; Liu, Yushuang^1 ; Hu, Xinju^1 ; Liang, Xiuke^1

Department of Chemical Engineering, Chongqing University of Science and Technology, Chongqing

401331, China^1

关键词: Adsorption capacities;    Adsorption desorption;    Adsorption mechanism;    Functionalized silica;    Pseudo second order kinetics;    Pseudo-first order kinetic model;    Pseudo-first order kinetics;    Pseudo-second-order kinetic models;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/2/022044/pdf
DOI  :  10.1088/1755-1315/108/2/022044

来源: IOP

【 摘 要 】

In the present study, the adsorption behavior of copper (II) ion from aqueous solution onto multi-carboxylic-functionalized silica gel (SG-MCF) has been investigated in detail by means of batch and column experiments. Batch experiments were performed to evaluate the effects of contact time on adsorption capacity of copper (II) ion. The kinetic data were analyzed on the basis of the pseudo-first-order kinetic and the pseudo-second-order kinetic models and consequently, the pseudo-second-order kinetic can better describe the adsorption process than the pseudo-first-order kinetic model. And the adsorption mechanism of the process was studied by intra-particle and film diffusion, it was found out that the adsorption rate was governed primarily by film diffusion to the adsorption onto the SG-MCF. In addition, column experiments were conducted to assess the effects initial inlet concentration and the flow rate on breakthrough time and adsorption capacity ascertaining the practical applicability of the adsorbent. The results suggest that the total amount of adsorbed copper (II) ion increased with declined flow rate and increased the inlet concentration. The adsorption-desorption experiment confirmed that adsorption capacity of copper (II) ion didn't present an obvious decrease after five cycles.