LDO负载纳米二氧化钛复合物的制备及其光催化性能研究

发布时间：2019-03-11 11:50

【摘要】：以碳酸根型镁铝层状双氢氧化物(LDH)为载体,采用溶胶-凝胶法利用酞酸丁酯水解负载纳米TiO_2于LDH片层获得TiO_2/LDH前驱体,通过低温焙烧前驱体获得纳米二氧化钛/层状双金属氧化物复合物(TiO_2/LDO)。以亚甲基蓝溶液模拟染料污染物,在波长291 nm紫外光条件下测定吸光度,评价了光催化剂不同投加量,体系pH值以及光照时间条件下对亚甲基蓝降解率的影响,研究了TiO_2/LDO的光催化性能。结果表明:通过溶胶-凝胶法可以获得高分散纳米级(10 nm)TiO_2负载型TiO_2/LDH复合物,TiO_2/LDH中TiO_2负载率达8.01wt%(质量分数);TiO_2/LDO的光催化性能较纯LDO高,TiO_2负载于LDO层板对亚甲基蓝具有协同催化作用;在pH值为9的80 mL亚甲基蓝溶液(浓度为5 mg/L)中投入0.20 g TiO_2/LDO,催化反应8 h后降解率高达81.7%,TiO_2/LDO对亚甲基蓝溶液的光催化反应符合一级动力学方程。
[Abstract]:The TiO _ 2/ LDH precursor was obtained by the sol-gel method by using the carbonate-type magnesium-aluminum layered double hydroxide (LDH) as the carrier, and the nano-titanium dioxide/ layered double-metal oxide complex (TiO _ 2/ LDO) was obtained by low-temperature roasting of the precursor. The photocatalytic performance of TiO _ 2/ LDO was studied by using methylene blue solution to simulate the dye contamination, and to determine the absorbance at the wavelength of 291nm. The effect of different dosage of the photocatalyst, the pH value of the system and the degradation rate of methylene blue under the condition of light time was evaluated. The results showed that the TiO _ 2 loaded TiO _ 2/ LDH composite with high dispersion was obtained by sol-gel method, the loading rate of TiO _ 2 in TiO _ 2/ LDH was 8.01% by weight (mass fraction), and the photocatalytic performance of TiO _ 2/ LDO was higher than that of pure LDOs. 0.20 g of TiO _ 2/ LDO was put into 80 mL of methylene blue solution with a pH value of 9 (concentration of 5 mg/ L), and the degradation rate was as high as 81.7% after 8h, and the photocatalytic reaction of the TiO _ 2/ LDO to the methylene blue solution was in accordance with the first-order kinetic equation.
【作者单位】：桂林理工大学材料科学与工程学院;桂林理工大学化学与生物工程学院;广西有色金属及特色材料加工国家重点实验室培育基地;
【基金】：国家自然科学基金面上项目(41572034,41272064) 广西生态型铝产业协同创新中心
【分类号】：O643.36;O644.1

【相似文献】