MgAl层状双金属氧化物负载TiO_2光催化降解亚甲基蓝的性能研究

The photocatalytic degradation of methylene blue on MgAl layered double oxides loaded TiO_2 photocatalysts

采用共沉淀法将锐钛矿型二氧化钛(TiO_2)负载于镁铝层状双金属氢氧化物(MgAl-LDH)上,再经一定温度煅烧得到TiO_2/MgAl层状双金属氧化物(TiO_2/MgAl-LDO).采用X射线粉末衍射、扫描电子显微镜、紫外可见漫反射光谱等对TiO_2/MgAl-LDO的形貌、晶体结构及光学性质等进行了表征.以亚甲基蓝溶液模拟染料废水,在300 W的氙灯照射下,探讨了TiO_2/MgAl-LDO光催化降解亚甲基蓝的性能.结果表明,TiO_2的负载量约为50%时,催化剂表现出最佳的光催化降解亚甲基蓝性能.

MgAl-layered double oxides loaded titanium dioxide （TiO 2 /MgAl-LDO） was fabricated by an in-situ codeposition MgAl-layered double hydroxides （MgAl-LDH） with TiO 2 followed by a high temperature calcination. The morphology, crystalline structure and optical properties of TiO 2 /MgAl-LDO were characterized by using X-ray diffraction, scanning electron microscopy and UV-vis diffuse spectroscopy. The photocatalytic activity of TiO 2 /MgAl-LDO was evaluated by the photocatalytic degradation of the model pollutant-methylene blue under the light irradiation with 300 W Xe lamp. Results indicated that the optimal photocatalytic performance occurred at the loading content of TiO 2 reached ca. 50%.