以海藻酸钠为基体的Ag/AgBr/TiO2整体式光催化剂的高效制备及其光催化性能

以海藻酸钠为基体制备出尺寸均一的整体式光催化剂SA-Ag/AgBr/TiO₂, 通过SEM、TEM、HRTEM、XPS、FT-IR以及BET等手段对产物形貌、结构、比表面积和光学性质进行表征, 并测定了其对罗丹明B(RhB)溶液的光催化性能。结果表明, 整体式光催化剂SA12-Ag/AgBr/TiO₂(Ag/AgBr/TiO₂催化剂的质量分数为12%)的结构稳定, 且具有良好的光催化活性, 即在紫外光照60 min内, RhB溶液降解完全, 在可见光照120 min下RhB的降解率可达到54.1%, 且在5次重复试验中仍保持96%以上的催化活性, 稳定性良好。这种整体式光催化剂有效解决了粉体材料难回收、二次污染和固定化后光催化效率低等问题。

High-efficient Synthesis and Photocatalytic Properties of Ag/AgBr/TiO2 Monolithic Photocatalysts Using Sodium Alginate as Substrate

SA-Ag/AgBr/TiO₂ monolithic photocatalysts with uniform particle size distribution was synthesized by using sodium alginate as a substrate. Its structure and morphology were characterized by XRD, XPS, SEM, TEM, and HRTEM. The optical properties and the surface area of the SA-Ag/AgBr/TiO₂ monolithic photocatalysts were characterized by FT-IR and BET. The as-prepared photocatalyst with good stability exhibited enhanced photocatalytic performance for degradation of RhB solution under both UV and visible light. The SA-Ag/AgBr/TiO₂ monolithic photocatalyst with 12wt% Ag/AgBr/TiO₂ display optimum properties i.e. about 100% degradation rate for the RhB solution for 60 min under UV irradiation and 54.1% degradation rate for the RhB solution under visible light irradiation for 120 min. Besides, after 5 cycles, the RhB degradation rate still keeps higher than 96%, showing an excellent reusability of the photocatalysts. The as-prepared SA-Ag/ AgBr/TiO₂ monolithic photocatalysts may effectively solve the problems including photocatalytic activity, secondary pollution and photocatalyst recycling.