No abstract

An efficient method for mesoporous molecular sieve MCM-41 was introduced in this report. In EDA/TEOS/CTAB/glycerol system, mesoporous molecular sieve MCM-41 has been synthesized at room temperature and under hydrothermal condition, respectively, characterized by X-ray power diffraction and N2 adsorption. Compared with the samples synthesized under hydrothermal condition, the samples synthesized at room temperature have better order, larger pore diameter and narrower pore diameter distribution.

Using the mixture of cationic cetyltrimethylammonium bromide (CTAB) and anionic Sodium Alkyl Epoxy Ethylene Carboxylate (AEC9Na) as template, tetraethyl orthosilicate (TEOS) as silica source, ethylenediamine (EDA) as base source, mesoporous MCM-41 has been synthesized at room temperature, characterized by X-ray power diffraction(XRD) and N2 adsorption. The results showed that with the change of the ratio of cationic to anionic surfactant the pore size can be controlled and the mesoporous MCM-41 has larger pore size than that synthesized by using CTAB alone as template.

Using Tetrabutyl titanate (TBOT) as titanium source, the nanocrystal TiO2 was synthesized via hydrolysis deposition processing in cationic surfactant system at room temperature. The synthesized products were characterized by TEM and XRD. Photocatalytic degrade to NPE-10, phenol and DBS in solar irradiating were studied, respectively. The TiO2 powder showed excellent photocatalytic property. It was different to degrade three substances. NPE-10 was degraded nearly 70% in 2 hours, phenol was degraded nearly 95% in 8 hours, DBS was degraded nearly 82% in 8 hours.

Using anionic surfactant sodium alkyl epoxy ethylene carboxylate as structure-oriented agent mesoporous titanium dioxide was direct prepared at ambient temperature via hydrolysis precipitation. The synthesized products were characterized by XRD and N2-adsorption. XRD analysis indicates that the TiO2 exhibits anatase phase and its pore disappears at 550 °C calcinations temperature. N2-adsorption results shows that high surface area of 324 m2/g, pore volume of 0.211 cm3/g and pore size of 3.5 nm were obtained in no heat-treated sample.