锶掺杂二氧化钛介孔材料的制备及其光降解邻硝基苯酚

采用固相法合成了锶掺杂二氧化钛(Sr-TiO2)介孔材料。采用XRD、TEM、UV-Vis、BET、Raman等测试手段对材料进行了详细表征,考察了材料对邻硝基苯酚的光催化活性。结果表明,Sr-TiO2材料为锐钛矿相,典型样品的BET比表面积为160.9 m2/g,孔径集中分布在7.2 nm处。锶的掺杂使TiO2晶体结构产生微小畸变,吸收带边发生红移;在紫外光照射下,Sr-TiO2对邻硝基苯酚的催化降解性能比纯TiO2有明显提高,2 h内光催化降解率达到98.2%。在邻硝基苯酚初始质量浓度为30 mg/L,催化剂投加量为1.2 g/L,光催化效率最高。

Solid-Phase Synthesis of Sr-doped TiO2 Mesoporous Materials and their Photodegradation Properties of O-nitrophenol

Abstract: A series of mesoporous strontium-doped titania (Sr-TiO2) materials were synthesized by solid-phase route. These materials were characterized using XRD, TEM, UV-Vis, BET, Raman measurement techniques; their photocatalytic activities were evaluated by measuring the photodegradation of O-nitrophenol solution under UV irradiation. The results showed that the crystal lattice of Sr-TiO2 was anatase phase, the special surface area of a typical product was 160.9m2/g, and pore size distribution was 7.2 nm. Because of Strontium doping, there was slight distortion in the crystal structure of TiO2, and Red-Shift can be seen on absorption band; Under UV irradiation, the photodegradation performance of Sr-TiO2 was improved obviously compared with that of pure TiO2, reached 98.2% in 2 hours. The photocatalytic efficiency reached the maximum when the initial concentration Of O-nitrophenol solution was 30 mg/L and catalyst amount was 1.2g/L.