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.
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 photocata-lysts were characterized by FT-IR and BET. The as-prepared photocatalyst with good stability exhibited en-hanced 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 propertiesi.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, sec-ondary pollution and photocatalyst recycling.
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