Adsorption behavior of phosphate on Lanthanum(III) doped mesoporoussilicates material
Jianda Zhang , Zhemin Shen , Wenpo Shan , Ziyan Chen , Zhijian Mei , Yangming Lei , Wenhua Wang
DOI:
Received June 11, 2009,Revised November 16, 2009, Accepted , Available online
Volume 22,2010,Pages 507-511
- Summary
- References
- Related Articles
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.
