Adsorption behavior of phosphate on lanthanum(III) doped mesoporous silicates material.
A series of lanthanum doped meosoporous MCM-41 (LaxM41, x is Si/La molar ratio) was prepared by sol-gel method. The surface structure of the materials was investigated with X-ray diffraction and N2 adsorption/desorption technique. The content of La in the materials was determined by ICP. It was found that the La content of La25M41, La50M41 and La100M41 was 7.53%, 3.89% and 2.32%, respectively. The phosphate adsorption capacities increased with increasing amount of La incorporation. With 0.40 g La25M41 99.7% phosphate could be removed. The effects of Si/La molar ratio, LaxM41 dose, pH, initial concentration of phosphate solution, co-ions on phosphate adsorption were also evaluated. The phosphate adsorption kinetics of LaxM41 could be well-described by the pseudo second-order model, and Langmuir isotherm fit equilibrium data much better than the Freundlich isotherm.
Zhang
Jianda
J
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China. zjdrf@163.com
Shen
Zhemin
Z
Shan
Wenpo
W
Chen
Ziyan
Z
Mei
Zhijian
Z
Lei
Yangming
Y
Wang
Wenhua
W
D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007811:Lanthanum / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D014961:X-Ray Diffraction
D010710:Phosphates; D017640:Silicates; D007811:Lanthanum