Ag/TiO_(2)纳米粒子的制备及其光催化降解苯酚的性能研究

Preparation of Ag/TiO_(2) nanoparticles and study on photocatalytic degradation of phenol

采用溶胶-凝胶法制备了TiO_(2)和Ag/TiO_(2)纳米粒子,采用涂覆法制备了TiO_(2)和Ag/TiO_(2)纳米粒子光催化剂基板样品。使用XRD、SEM和拉曼光谱等手段,对TiO_(2)和Ag/TiO_(2)纳米粒子进行了晶格结构和表面形貌研究;通过UV-Vis,研究了TiO_(2)和Ag/TiO_(2)纳米粒子光催化剂基板样品在光催化反应器中对苯酚的光催化降解性能。结果表明,制备的TiO_(2)和Ag/TiO_(2)纳米粒子均为纯净的金红石相,二者表面形貌并没有明显区别,Ag单质粒子成功负载在TiO_(2)纳米材料上;Ag单质粒子的负载,明显增强了TiO_(2)纳米粒子对可见光的吸收,且Ag/TiO_(2)纳米粒子薄膜对苯酚的光催化降解性能明显优于TiO_(2)纳米粒子薄膜;在光催化降解1 h后,TiO_(2)纳米粒子薄膜仅催化降解了溶液中30%(质量分数)的苯酚,且光催化降解出现了饱和趋势,而Ag/TiO_(2)纳米粒子薄膜可催化降解溶液中50%(质量分数)的苯酚,且在光催化降解3 h后,仍未出现饱和趋势。

TiO_(2) and Ag/TiO_(2) nanoparticles are prepared by sol-gel method and the TiO_(2) and Ag/TiO_(2) nanoparticle photocatalyst substrate samples are prepared by coating method.The lattice structure and surface morphology of TiO_(2) and Ag/TiO_(2) nanoparticles are studied by XRD,SEM and Raman spectroscopy,and the photocatalytic degradation of phenol by TiO_(2) and Ag/TiO_(2) nano particle photocatalyst substrate samples in photocatalytic reactor is studied by UV-Vis.The results show that the prepared TiO_(2) and Ag/TiO_(2) nanoparticles are pure rutile phase and there is no obvious difference in surface morphology between the two.Ag particles are successfully supported on TiO_(2) nanomaterials.The absorption of visible light by TiO_(2) nanoparticles is significantly enhanced by Ag support and the photocatalytic performance of Ag/TiO_(2) nanoparticle film on phenol is significantly better than that of TiO_(2) nanoparticle film.When photocatalytic degradation is conducted for 1 h,TiO_(2) nanoparticle film only catalyzes degradation of 30 wt%phenol in the solution,and the photocatalytic degradation shows a saturation trend,while Ag/TiO_(2) nanoparticle film could catalyze the degradation of 50 wt%phenol in the solution.Furthermore,there is still no saturation trend when the photocatalytic degradation is conducted for 3 h.