不同还原工艺对石墨烯薄膜光催化性能的影响
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摘要
为了研究不同热处理温度、还原方式对薄膜光催化性能的影响,根据改进的Hummers法制备了5mg/mL氧化石墨烯分散液,采用匀胶法在玻璃片基底上制备了氧化石墨烯薄膜。通过SEM扫描电子显微镜、EDS能谱仪和拉曼光谱仪对不同热处理还原前后薄膜的微观形貌、成分、结构进行表征,并在模拟日光型光源照明下,对40mg/L亚甲基蓝溶液进行降解。结果表明:随着热处理温度的升高,薄膜表面含氧官能团去除越彻底,EDS能谱中C/O原子比越大,拉曼光谱中D峰与G峰强度比(ID/IG)越强,与空气热处理还原法相比,真空热处理更加温和,表面缺陷修复得更多。在相同温度下,真空热处理薄膜光催化降解能力比空气热处理高,可为研究石墨烯催化降解提供参考。
The effects of different heat treatment temperature、reduction mode on photocatalytic performance of graphene film were studied in this paper.According to the modified Hummers method,5 mg/mL graphene oxide dispersion was prepared and the graphene oxide film was prepared on the glass substrate by spin coating method.The microstructures,compositions and structures of the modified graphene film before and after the different heat treatment reduction were characterized by scanning electron microscopy,energy dispersive spectroscopy,Raman spectroscopy.And under simulated fluorescent lamp,the 40 mg/L methylene blue solution was degraded.The results show that the higher the heat treatment temperature,the more the removal of the oxygen-containing functional groups on the surface of the film,the greater the C/O atomic ratio in the EDS spectrum,the stronger the ratio between the intensity of the D peak and the G peak(ID/IG)in the Raman spectrum,but compared with air heat treatment,vacuum heat treatment reduced more moderate,and surface defects repaired more.Therefore the photocatalytic degradation of methylene blue decreases with the increase of heat treatment temperature,and the photocatalytic degrada-tion ability of the vacuum heat treatment film is higher than that of the air heat treatment film at the same temperature.
The effects of different heat treatment temperature、reduction mode on photocatalytic performance of graphene film were studied in this paper.According to the modified Hummers method,5 mg/mL graphene oxide dispersion was prepared and the graphene oxide film was prepared on the glass substrate by spin coating method.The microstructures,compositions and structures of the modified graphene film before and after the different heat treatment reduction were characterized by scanning electron microscopy,energy dispersive spectroscopy,Raman spectroscopy.And under simulated fluorescent lamp,the 40 mg/L methylene blue solution was degraded.The results show that the higher the heat treatment temperature,the more the removal of the oxygen-containing functional groups on the surface of the film,the greater the C/O atomic ratio in the EDS spectrum,the stronger the ratio between the intensity of the D peak and the G peak(ID/IG)in the Raman spectrum,but compared with air heat treatment,vacuum heat treatment reduced more moderate,and surface defects repaired more.Therefore the photocatalytic degradation of methylene blue decreases with the increase of heat treatment temperature,and the photocatalytic degrada-tion ability of the vacuum heat treatment film is higher than that of the air heat treatment film at the same temperature.
引文
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[3] FARMANI A,ZARIFKAR A,SHEIKHI M H,et al.Design of a tunable graphene plasmonic-on-white graphene switch at infrared range[J].Superlattices and Microstructures,2017,112:404-414.
[4] GHANY N A A,ELSHERIF S A,HANDAL H T.Revolution of graphene for different applications:State-of-the-art[J].Surfaces and Interfaces,2017,9(5):93-106.
[5] DASARI B L,NOURI J M,BRABAZON D,et al.Graphene and derivatives:Synthesis techniques,properties and their energy applications[J].Energy,2017,140(1):766-778.
[6] CHUA C K,PUMERA M.Reduction of graphene oxide with substituted borohydrides[J].Journal of Materials Chemistry A,2013,1(5):1892-1898.
[7] CHABAN V V,PREZHDO O V.Microwave reduction of graphene oxide rationalized by reactive molecular dynamics[J].Nanoscale,2017,9(11):4024-4033.
[8]王永祯,王艳,韩非,等.还原热处理对石墨烯薄膜导电性的影响[J].新型炭材料,2012,27(4):266-270.WANG Yongzhen,WANG Yan,HAN Fei,et al.The effect of heat treatment on the electrical conductivity of highly conducting graphene films[J].New Carbon Materials,2012,27(4):266-270.
[9] SAEID B,MORTEZA M,ALI K M.Deposition of graphene oxide using electrophoretic method and heat treatment temperature effect on the character of the super capacitor[J].Journal of Advanced Materials and Technologies,2016,5(3):41-50.
[10]MUZYKA R,KWOKA M,SMEDOWSKI,et al.Oxidation of graphite by different modified Hummers methods[J].New Carbon Materials,2017,32(1):15-20.
[11]阳海,魏宏庆,胡乐天,等.单偶氮染料AY17的光催化降解动力学及机制[J].环境科学,2016,37(8):3086-3093.YANG Hai,WEI Hongqing,HU Letian,et al.Photocatalytic degradation kinetics and mechanism of monoazo dye acid yellow 17by UV/TiO2in aqueous solution[J].Environmental Science,2016,37(8):3086-3093.
[12]刘燕珍,李永锋,杨永岗,等.低温热处理对氧化石墨烯薄膜的影响[J].新型炭材料,2011,26(1):41-45.LIU Yanzhen,LI Yongfeng,YANG Yonggang,et al.The effect of thermal treatment at low temperatures on graphene oxide films[J].New Carbon Materials,2011,26(1):41-45.
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[14]WANG X,ZHI L,MLLEN K.Transparent,conductive graphene electrodes for dye-sensitized solar cells[J].Nano Letters,2008,8(1):323-327.
[15]REN P G,YAN D X,JI X,et al.Temperature dependence of graphene oxide reduced by hydrazine hydrate[J].Nanotechnology,2011,22(5):256-262.