Adsorption of Pb(II) from aqueous solutions by wheat straw biochar

4th International Conference on Water Resource and Environment

地球科学;生态环境科学

Mu, R.M.^1 ; Wang, M.X.^1 ; Bu, Q.W.^2 ; Liu, D.^1 ; Zhao, Y.L.^1

School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan, China^1

Water Resources Research Institute of Shandong Province, Jinan, China^2

关键词: Adsorption capacities;    Adsorption properties;    Increasing temperatures;    Initial concentration;    Langmuir isotherm models;    Monolayer adsorption;    Pseudo-second order model;    Pseudo-second-order kinetic models;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/191/1/012041/pdf
DOI  :  10.1088/1755-1315/191/1/012041

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This work focuses on the preparation of biochar and the study of the adsorption properties of lead ions on it in water. CS (carbon wheat straw) was obtained by carbonizing 60 min at 300C. Batch experiments were conducted to study the effects of initial pH value, contact time, adsorbent dose, initial concentration and temperature on the adsorption properties. Pseudo first order and pseudo second order models were used to study the kinetics of the process, and results showed adsorption of Pb2+ by CS followed pseudo second order kinetic model. The Langmuir isotherm model provided the best correlation for Pb2+ adsorption, indicating that the adsorption was chemical monolayer adsorption. The adsorption capacity qm was increased with increasing temperature, reached 149.701mg/g for CS and 44.663 mg/g for NS (natural straw), at 35C, respectively, showing the adsorption was exothermic. It was concluded that the adsorption capacity of CS is 3.3 times of that of NS which means that the carbonization of wheat straw was of certain value in the treatment of lead ions in wastewater.