Modification for SB A-15 Molecular Sieve by Lanthanum(III)

SBA-15 molecular sieve was prepared under a strong acidity condition by using tri-block copolymer, poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) as the template and tetraethyl orthosilicate as the silica source by means of a hydrothermal method. La-(SBA-15) composite materials were prepared by a solid-liquid exchange method using the cal-cinedhost material SBA-15 molecular sieve and lanthanum chloride in water and water+alcohol media, respectively. By mean of chemical analysis, powder X-ray diffraction, nitrogen adsorption-desorption technique and infrared spectroscopy, the validity of the preparative method and the effect of it on the pore structure of SBA-15 molecular sieve were evaluated. In addition, the luminescence phenomena of La-(SBA-15) product were observed. The results show that lanthanum has been incorporated into SBA-15 molecular sieve. The silanol groups on the internal wall surfaces are the major sites for lanthanum incorporation. The part of the guest is in the channels of the molecular sieve. The prepared materials La-(SBA-15) keep the highly ordered mesoporous two-dimensional hexagonal structure and do not change the mesoporous channel structure of the support SBA-15.