Application of different activated attapulgites to purify phosphate contaminated wastewater

2nd International Conference on Materials Science, Energy Technology and Environmental Engineering

材料科学;能源学;生态环境科学

Gan, Fangqun^1 ; Hu, Jien^1 ; Tang, Rong^1 ; Qin, Pinzhu^1 ; Hang, Xiaoshuai^2

College of Environment and Ecology, Jiangsu Open University, Nanjing

210017, China^1

Nanjing Institute of Environmental Science, Ministry of Environmental Protection of China, Nanjing

210042, China^2

关键词: Adsorption kinetics;    Contaminated wastewater;    Modified products;    Multilayer adsorption;    Phosphate adsorption;    Phosphate sorption capacity;    Pseudo second order kinetics;    Thermal activation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/81/1/012023/pdf
DOI  :  10.1088/1755-1315/81/1/012023

来源: IOP

【 摘 要 】

Phosphate adsorption capabilities of different activated attapulgites were investigated. The natural attapulgites were treated by thermal activation over 120-800 °C for 2 h, and by hydrochloric acid so-lution from 1%-9%, respectively. The mechanisms of phosphate adsorption of these modified products were also studied through adsorption isotherms and adsorption kinetics experiments. The acid activation increased the phosphate sorption capacity and the highest phosphate sorption capacity occurred at AAT3 (attapulgite activated by 3% hydrochloric acid), while thermal activation did not have the same effect. AAT3 showed higher adsorption rate than natural attapulgite (AT). The phosphate adsorption isotherms of AT, H400 and AAT3 are fitted well with Langmuir equation in terms of R2 values. It suggested that the adsorption of phos-phate on attapulgite was homogeneous multilayer adsorption. Based on R2 values, the kinetics of phosphate adsorption on these three attapulgites can be satisfactorily described by pseudo-second-order kinetic equa-tion. Results of this study suggested that acid modified attapulgite could be potentially used as a promising adsorption media for phosphate removal.