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- 2019
RGO-MIL-68(Fe)复合材料的静电自组装合成及光催化还原Cr(Ⅵ)的性能
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Abstract:
采用静电自组装方法制备氧化石墨烯（GO）-MIL-68（Fe）复合物，并通过简单溶剂热处理，将GO还原为还原氧化石墨烯（RGO），首次制得RGO-MIL-68（Fe）复合物。通过XRD、FESEM、紫外-可见漫反射光谱（UV-Vis DRS）等方法对RGO-MIL-68（Fe）复合催化剂的晶体结构、形貌、光吸收性能等物理化学性质进行表征。在可见光照射下，以草酸铵（（NH4）2C2O4）为牺牲剂，对RGO-MIL-68（Fe）复合材料进行光催化还原Cr（Ⅵ）性能评价，结果表明，只需复合少量的RGO，MIL-68（Fe）的光催化活性就能显著地提高。当RGO含量为1wt%时，RGO-MIL-68（Fe）复合材料表现出最优的光催化活性，反应60 min，体系中的Cr（Ⅵ）的还原率高达81%。结合电化学分析可知，这主要是由于RGO的引入在增强MIL-68（Fe）光吸收性能的同时也促进了光生载流子的分离。 Novel photocatalysts reduced graphene oxide (RGO)-MIL-68(Fe) were synthesized via an electrostatically derived self-assembly of MIL-68(Fe) with graphene, followed by solvothermal approach. The as-prepared RGO-MIL-68(Fe) composites were characterized by XRD, FESEM and UV-vis diffuse reflectance spectra (UV-vis DRS). The photocatalytic activity for reduction of Cr(Ⅵ) over RGO-MIL-68(Fe) composites were investigated under visible light irradiations using ammonium oxalate ((NH4)2C2O4) as a sac-rificial agent. The results show that the reduction of Cr(Ⅵ) over MIL-68(Fe) can be significantly increased by loading RGO. An optimum activity is achieved over 1wt%RGO-MIL-68(Fe) composite, giving a corresponding Cr(Ⅵ) reduction ratio of 81% after 60 min under visible light irradiation. Combining with photoelectrochemical analyses, it can be revealed that the introduction of RGO will minimize the recombination of photogenerated electron-hole pairs. 陕西理工大学校级科研基金（SLGKY2017-11）；福建省教育厅项目（JAT160767）和陕西理工大学合成气催化转化研究团队资
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