TiO₂ incorporated in magnetic mesoporous SBA-15 by a facile inner-pore hydrolysis process toward enhanced adsorption-photocatalysis performances for As(III)

Lian Yu; Xiaofang Yang; Dongsheng Wang

doi:10.1016/j.jcis.2015.02.071

TiO₂ incorporated in magnetic mesoporous SBA-15 by a facile inner-pore hydrolysis process toward enhanced adsorption-photocatalysis performances for As(III)

J Colloid Interface Sci. 2015 Jun 15:448:525-32. doi: 10.1016/j.jcis.2015.02.071. Epub 2015 Mar 7.

Authors

Lian Yu¹, Xiaofang Yang¹, Dongsheng Wang²

Affiliations

¹ State key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
² State key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China. Electronic address: wangdongshengrcees@126.com.

PMID: 25792475
DOI: 10.1016/j.jcis.2015.02.071

Abstract

A facile inner-pore hydrolysis combining solvent evaporation method was used to decorate mesoporous silica, in which γ-Fe2O3 nanoparticles was preloaded onto mesoporous SBA-15 followed by decoration of TiO2 nanoparticles. This decoration process exploited the homogeneous dispersivity of γ-Fe2O3 and TiO2 nanoparticles in/on SBA-15 and inhibit aggregation of γ-Fe2O3 and TiO2 nanoparticles, which in turn leaded to a synergistic photocatalytic oxidation and adsorption of As(III). It was found that the prepared nanocomposites had mesoporous structure, large specific surface area, high pore volume and superparamagetism according to SEM/TEM, N2 adsorption-desorption isotherms, XRD and VSM analysis. Experimental results show that SBA-15/γ-Fe2O3-TiO2 can oxidize As(III) to As(V) efficiently in the photocatalysis reaction. At the same time, As(V) is effectively removed through adsorption by the composites. In addition, with the treatment of alkali solution, As(V) can be easily desorbed from SBA-15/γ-Fe2O3-TiO2. After reusage for 5 times, the composites still retain comparable catalysis and adsorption performance compared with that of first use, revealing the excellent stability of the composites.

Keywords: Arsenite removal; Magnetic mesoporous; Nanocomposites; Photocatalytic oxidation; SBA-15.