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首先采用Hummers法制备氧化石墨烯(GO),然后用柠檬酸络合溶胶-凝胶法原位合成GO-La~(3+)/TiO_2,再经硼氪化钠还原得到石墨烯-La~(3+)/TiO_2(rG0-La~(3+)/TiO_2)复合材料;利用X射线衍射(XRD)、透射电镜(TEM)、荧光光谱(PL)对其进行表征分析。研究了GO加入量对复合材料光催化效率的影响及复合光催化剂投入量对甲基橙降解率的影响。结果表明:柠檬酸络合法可以有效改善纳米La~(3+)/TiO_2在rGO表面的分散情况;rG0-La~(3+)/TiO_2复合光催化剂的光催化活性明显高于La~(3+)/TiO_2,GO加入量对复合材料光催化性能影响很大;降解甲基橙时,复合光催化剂最佳投入量为0.10g。
First, GO-La ~ (3 +) / TiO_2 was synthesized in situ by citric acid complex sol-gel method using the Hummers method to prepare graphene oxide (GO) (3 +) / TiO 2 (rG0-La ~ (3 +) / TiO_2) composites were synthesized and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and fluorescence spectroscopy (PL) The effect of GO addition amount on the photocatalytic efficiency of composite and the effect of composite photocatalyst dosage on the degradation rate of methyl orange were studied. The results showed that the citric acid complexation method could effectively improve the dispersion of La 3+ / TiO 2 on rGO surface. The photocatalytic activity of rGO-La 3+ / TiO 2 composite photocatalyst was significantly higher than that of La 2+ 3 +) / TiO_2 and GO addition greatly affect the photocatalytic activity of the composites. When methyl orange is degraded, the best dosage of composite photocatalyst is 0.10g.