Synthesis Of Mesoporous Silicon-Based Materials And Application For Low Concentration Pollutant Wastewater

A new route for the economic and efficient treatment of azo dye pollutants is reported, in which mesoporous silica (MS) and surface-modified organic-inorganic hybrid mesoporous silica spheres were chosen as microreactors for the accumulation and subsequent photodegradation of pollutants in defined regions. The MS was synthesized according to Stober method from sodium silicate. The surface-modified silica materials were prepared by anchoring the polycationic species such as poly(allylamine hydrochloride) (PAH) on MS spheres via a simple wet impregnation method. The as-synthesized MS and PAH-modified MS (PAH-MS) spheres with well-defined porous structures exhibited a very efficient accumulating capacity for different kinds of the target pollutant. According to the new method, the pollutants were completely degradated in the Fenton system under the visible light efficientlyComparative photodegradation study on homogeneous dye solution and heterogeneous dye-accumulated suspension in Fenton reagent, together with kinetics patterns in recycling degradation show that the MS and the PAH-MS spheres may be utilized as environment-friendly microcarriers for the remediation of dye wastewater.It was also examined that Fe-anchored mesoporous SiO₂ as microcarrier accumulated dyes, and the dyes-accumlated on the SiO₂ was degradated in Fenton system under the visible light. It was found that the degradation efficiency of dyes on the Fe-anchored mesoporous SiO₂ had been improved greatly.