氧化石墨烯改性ZnO/CeO_2复合纳米材料的制备及其紫外屏蔽性能研究
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摘要
以六水硝酸锌、六水硝酸铈、氧化石墨烯为原料,采用溶胶凝胶法制备了氧化石墨烯(GO)改性ZnO/CeO_2复合纳米紫外屏蔽剂。采用X射线衍射(XRD)、扫描电镜(SEM)、傅立叶变换红外光谱(FTIR)、紫外可见分光光度计(UV-Vis)等测试手段对产物的结构、组成及形貌进行表征,研究了氧化铈与氧化锌摩尔比、GO投入量、屏蔽剂用量以及pH值对复合纳米材料紫外屏蔽性能的影响,探索了氧化石墨烯改性ZnO/CeO_2复合纳米的最佳制备条件。结果表明:氧化石墨烯改性ZnO/CeO_2复合纳米材料中GO、CeO_2、ZnO的平均粒径分别为8. 3、15. 4、37. 5 nm。当pH 6. 0、氧化铈与氧化锌摩尔比为4∶1、GO投入量为2. 0g、屏蔽剂用量为0. 06 g/L时,紫外屏蔽性能强弱顺序为:氧化石墨烯改性ZnO/CeO_2复合纳米材料> GO>ZnO/CeO_2复合纳米材料> CeO_2> ZnO。
An outstanding UV-shielding agent based on graphene oxide modified ZnO//CeO_2 nanocomposites was prepared by sol-gel method using zinc nitrate hexahydrate,ceric nitrate hexahydrate and graphene oxide( GO) as raw materials. The structure,composition and morphology of the as-prepared sample were characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM),Fourier transform infrared spectroscopy( FT-IR) and ultraviolet and? visible spectrophotometry( UVVis). The influences of molar ratio of cerium oxide to zinc oxide,mass of graphene oxide,amount of shielding agent loaded and pH value on the UV-shielding performance of the GO/ZnO//CeO_2 nanocomposites were investigated. The average sizes for GO,/CeO_2 and ZnO in the graphene oxide modified ZnO//CeO_2 nanocomposites were 8. 3,15. 4 and 37. 5 nm,respectively. The optimum conditions were as follows: p H value: 6. 0,molar ratio of cerium oxide to zinc oxide: 4 ∶ 1,mass of graphene oxide: 2. 0 g,amount of shielding agent loaded: 0. 06 g/L. Under the optimal conditions,the sequence for UV-shielding performances of the agents were as follows: graphene oxide modified ZnO//CeO_2 nanocomposites > GO > ZnO//CeO_2 nanocomposites > /CeO_2> ZnO.
An outstanding UV-shielding agent based on graphene oxide modified ZnO//CeO_2 nanocomposites was prepared by sol-gel method using zinc nitrate hexahydrate,ceric nitrate hexahydrate and graphene oxide( GO) as raw materials. The structure,composition and morphology of the as-prepared sample were characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM),Fourier transform infrared spectroscopy( FT-IR) and ultraviolet and? visible spectrophotometry( UVVis). The influences of molar ratio of cerium oxide to zinc oxide,mass of graphene oxide,amount of shielding agent loaded and pH value on the UV-shielding performance of the GO/ZnO//CeO_2 nanocomposites were investigated. The average sizes for GO,/CeO_2 and ZnO in the graphene oxide modified ZnO//CeO_2 nanocomposites were 8. 3,15. 4 and 37. 5 nm,respectively. The optimum conditions were as follows: p H value: 6. 0,molar ratio of cerium oxide to zinc oxide: 4 ∶ 1,mass of graphene oxide: 2. 0 g,amount of shielding agent loaded: 0. 06 g/L. Under the optimal conditions,the sequence for UV-shielding performances of the agents were as follows: graphene oxide modified ZnO//CeO_2 nanocomposites > GO > ZnO//CeO_2 nanocomposites > /CeO_2> ZnO.
引文
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