title: Adsorption behavior of phosphate on lanthanum(III) doped mesoporous silicates material.
abstract: 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.
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China. zjdrf@163.com
authors.forename: Jianda
authors.initials: J
authors.lastname: Zhang
authors.forename: Zhemin
authors.initials: Z
authors.lastname: Shen
authors.forename: Wenpo
authors.initials: W
authors.lastname: Shan
authors.forename: Ziyan
authors.initials: Z
authors.lastname: Chen
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Mei
authors.forename: Yangming
authors.initials: Y
authors.lastname: Lei
authors.forename: Wenhua
authors.initials: W
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007811:Lanthanum / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D010710:Phosphates; D017640:Silicates; D007811:Lanthanum