Improving lead adsorption through chemical modification of wheat straw by lactic acid

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Mu, Ruimin^1 ; Wang, Minxiang^1 ; Bu, Qingwei^2 ; Liu, Dong^1 ; Zhao, Yanli^1

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

Water Resources Research Institute of Shan Dong Province, Jinan, China^2

关键词: Adsorption capacities;    Adsorption isotherm model;    Fourier transform infrared;    Increasing temperatures;    Initial concentration;    Langmuir isotherm models;    Monolayer adsorption;    Scanning electron micrographs;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/2/022063/pdf
DOI  :  10.1088/1755-1315/108/2/022063

来源: IOP

【 摘 要 】

This work describes the creation of a new cellulosic material derived from wheat straw modified by lactic acid for adsorption of lead in aqueous solution, called 0.3LANS (the concentration of the lactic acid were 0.3mol/L). Batch experiments were conducted to study the effects of initial pH value, contact time, adsorbent dose, initial concentration and temperature. Fourier transform infrared (FTIR), Elemental analysis, BET surface area and Scanning electron micrographs (SEM) analysis were used to investigate the chemical modification. Adsorption isotherm models namely, Langmuir, Freundlich were used to analyse the equilibrium data, and the Langmuir isotherm model provided the best correlation, means that the adsorption was chemical monolayer adsorption and the adsorption capacity qmwas increased with increasing temperature, and reached 51.49mg/g for 0.3LANS at 35C, showing adsorption was exothermic.