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通过Hummers法及紫外光/热还原工艺制得还原氧化石墨烯(RGO),采用溶胶-凝胶-煅烧法,以RGO和钛酸酊脂为前驱体制备出RGO/TiO2光催化复合材料,并利用XRD、FT-IR等对其进行了表征.对RGO/TiO2光催化降解性能的研究发现,复合光催化剂RGO/TiO2对2,4-二氯苯氧乙酸(2,4-D)的光催化降解活性显著优于纯TiO2,并且发现负载量和pH值对光催化降解性能有较大的影响:RGO/TiO2投加量为1.2g·L~(-1)、RGO负载量2%、pH为3、初始浓度为50 mg·L~(-1)反应12 h,2,4-D去除率达到98.75%;2,4-D降解率随着RGO/TiO2投加量的增大先增大后减小;RGO/TiO2对2,4-D的降解为脱氯还原和催化氧化过程,产生氯酚、苯酚等中间产物.
RGO was prepared by Hummers method and UV / thermal reduction process. RGO / TiO2 photocatalytic composites were prepared by sol-gel-calcination method with RGO and titanate as precursor The photocatalytic degradation of RGO / TiO2 was studied by XRD, FT-IR etc. It was found that the photocatalytic activity of RGO / TiO2 on 2,4-D The results showed that the loading and the pH value had a great influence on the photocatalytic degradation performance: the dosage of RGO / TiO2 was 1.2g · L -1, the loading of RGO was 2% The 2,4-D removal rate reached 98.75% when pH was 3 and the initial concentration was 50 mg · L -1 for 12 h. With the increase of RGO / TiO2 dosage Increase and then decrease. The degradation of 2,4-D by RGO / TiO2 is dechlorination-reduction and catalytic oxidation process, resulting in intermediate products of chlorophenol and phenol.