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以无水乙醇-甲酰胺的混合溶液为溶剂,在高压釜中利用氧化石墨与氯化镧于100℃反应制备了氧化镧/还原型氧化石墨复合材料(La2O3/RGO)。研究了反应时间和溶剂配比对产物的影响,通过XRD,SEM,IR,XPS对产品进行了表征。结果表明:氧化石墨被还原成还原型氧化石墨,氧化镧与还原氧化石墨存在化学键相互作用,复合材料中La-O共价键的强度比通常所见的La-O键强。当溶剂配比为2∶1(乙醇/甲酰胺),反应时间24 h时得到的复合材料对光催化过氧化氢氧化亚甲基蓝具有良好活性,脱色率达96.2%。
Lanthanum oxide / reduced graphite oxide (La2O3 / RGO) was prepared by the reaction of graphite oxide with lanthanum chloride at 100 ℃ in a mixed solvent of anhydrous ethanol and formamide. The effects of reaction time and solvent ratio on the product were studied. The products were characterized by XRD, SEM, IR and XPS. The results show that graphite oxide is reduced to reduced graphite oxide and lanthanum oxide is chemically bonded with reduced graphite oxide. The La-O covalent bond in the composite is stronger than the usual La-O bonds. When the solvent ratio is 2: 1 (ethanol / formamide) and the reaction time is 24 h, the composite obtained has good activity on methylene blue with photocatalytic hydrogen peroxide and the decolorization rate reaches 96.2%.