关键词: 二氧化钛;分子筛;吸附;可见光催化

Abstract: Ti-Cr-MCM-48 photocatalyst was successfully synthesized via a facile and rapid single-step approach at room temperature, which takes CTAB as a template, Cr(NO3)3·9H2O and titanium isopropoxide as metallic precursors and TEOS as source of silicon.The resulting samples were characterized by XRD, FT-IR, SEM, BET and UV-Vis.The photocatalytic activities of the resulting samples were compared by removing RhB under UV and visible light irradiation.The effect of Ti content on the structure and performance of molecular sieve has also been studied, which shows that Ti and Cr can be evenly dispersed on the molecular sieve skeleton at the ratio of n(Ti)/n(Si) is 0.25.The sample 0.25Ti-Cr-MCM-48 has large specific surface area and mesoporous structure, which successfully solves the issue that the specific surface area decreased due to the doping of transition metal.The sample 0.25Ti-Cr-MCM-48 shows excellent adsorption and photocatalytic performance of Rhodamine B, which efficiency reached up to 85; in 3 h.When Ti content is further improved, the cubic phase structure of the molecular sieve are destroyed and the specific surface area has decreased sharply, which leads to the adsorption performance decrease.

Key words: Ti-Cr-MCM-48 photocatalyst was successfully synthesized via a facile and rapid single-step approach at room temperature, which takes CTAB as a template, Cr(NO3)3·9H2O and titanium isopropoxide as metallic precursors and TEOS as source of silicon.The resulting samples were characterized by XRD, FT-IR, SEM, BET and UV-Vis.The photocatalytic activities of the resulting samples were compared by removing RhB under UV and visible light irradiation.The effect of Ti content on the structure and performance of molecular sieve has also been studied, which shows that Ti and Cr can be evenly dispersed on the molecular sieve skeleton at the ratio of n(Ti)/n(Si) is 0.25.The sample 0.25Ti-Cr-MCM-48 has large specific surface area and mesoporous structure, which successfully solves the issue that the specific surface area decreased due to the doping of transition metal.The sample 0.25Ti-Cr-MCM-48 shows excellent adsorption and photocatalytic performance of Rhodamine B, which efficiency reached up to 85; in 3 h.When Ti content is further improved, the cubic phase structure of the molecular sieve are destroyed and the specific surface area has decreased sharply, which leads to the adsorption performance decrease.