ZnS/还原氧化石墨烯复合材料的制备及光催化性能
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摘要
水热法一步合成ZnS/还原氧化石墨烯(ZnS/RGO)复合材料,通过XRD、FTIR、Raman、SEM分析溶剂(乙醇、水)对ZnS/RGO复合材料形貌和结构的影响。结果表明,以乙醇为溶剂制备的ZnS颗粒尺寸小、均匀分散在石墨烯片层上,在形成ZnS纳米颗粒的同时将氧化石墨烯(GO)还原成石墨烯。对亚甲基蓝(MB)的光催化结果显示,ZnS/RGO复合材料具有优异的光催化性能,其光催化速率是纯ZnS颗粒的3.7倍,石墨烯作为优良光生电子的传输通道和收集体能够降低光生电子-空穴对的重新结合率,极大提高了ZnS/RGO复合材料的光催化性能。
The ZnS/reduced graphene oxide(ZnS/RGO)composites were synthesized via a one-pot hydrothermal synthesis.The effects of solvent(ethanol,water)on the morphology and structure of ZnS/RGO composites were analyzed by XRD,FTIR,Raman and SEM.The results show that small ZnS particles uniformly disperse on the graphene sheet when using ethanol as the solvent during the formation of ZnS nanoparticles and the reduction of graphene oxide(GO)occur simultaneously.The photocatalytic activity of the prepared ZnS/RGO composite was examined by the degradation of Methylene blue(MB).The experimental results suggest that the designed ZnS/RGO composite possess superior photocatalytic activity,which is 3.7 fold higher reaction rates for MB degradation than that of the pure ZnS nanoparticles.Graphene,as a good electron collector and transporter to reduce the photoinduced electron-hole pair recombination,can greatly improve the photocatalytic activity of ZnS/RGO composites.
The ZnS/reduced graphene oxide(ZnS/RGO)composites were synthesized via a one-pot hydrothermal synthesis.The effects of solvent(ethanol,water)on the morphology and structure of ZnS/RGO composites were analyzed by XRD,FTIR,Raman and SEM.The results show that small ZnS particles uniformly disperse on the graphene sheet when using ethanol as the solvent during the formation of ZnS nanoparticles and the reduction of graphene oxide(GO)occur simultaneously.The photocatalytic activity of the prepared ZnS/RGO composite was examined by the degradation of Methylene blue(MB).The experimental results suggest that the designed ZnS/RGO composite possess superior photocatalytic activity,which is 3.7 fold higher reaction rates for MB degradation than that of the pure ZnS nanoparticles.Graphene,as a good electron collector and transporter to reduce the photoinduced electron-hole pair recombination,can greatly improve the photocatalytic activity of ZnS/RGO composites.
引文
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[4] ZHANG Y,ZHANG N,TANG Z R,et al.Graphene transforms wide band gap ZnS to a visible light photocatalyst.The new role of graphene as a macromolecular photosensitizer[J].ACS Nano,2012,6(11):9777-9789.
[5] WANG X,LI Y,WANG M,et al.Synthesis of tunable ZnSCuS microspheres and visible-light photoactivity for rhodamine B[J].New Journal of Chemistry,2014,38(9):4182-4189.
[6] REDDY D A,CHOI J,LEE S,et al.Self-assembled macro porous ZnS-graphene aerogels for photocatalytic degradation of contaminants in water[J].RSC Advances,2015,5(24):18342-18351.
[7] RANDVIIR E P,BROWNSON D A C,BANKS C E.A decade of graphene research:Production,applications and outlook[J].Materials Today,2014,17(9):426-432.
[8] NOVOSELOV K S,FALKO V I,COLOMBO L,et al.A roadmap for graphene[J]. Nature,2012,490(7419):192-200.
[9] GOLSHEIKH A M,LIM H N,ZAKARIA R,et al.Sonochemical synthesis of reduced graphene oxide uniformly decorated with hierarchical ZnS nanospheres and its enhanced photocatalytic activities[J].RSC Advances,2015,5(17):12726-12735.
[10] HU H,WANG X,LIU F,et al.Rapid microwave-assisted synthesis of graphene nanosheets-zinc sulfide nanocomposites:Optical and photocatalytic properties[J].Synthetic Metals,2011,161(5-6):404-410.
[11] CHAKRABORTY K,CHAKRABARTY S,DAS P,et al.UV-assisted synthesis of reduced graphene oxide zinc sulfide composite with enhanced photocatalytic activity[J].Materials Science&Engineering B,2016,204:8-14.
[12] HU X,LI J,BAI Y.Fabrication of high strength graphene/regenerated silk fibroin composite fibers by wet spinning[J].Materials Letters,2017,194:224-226.
[13] DREYER D R,PARK S,BIELAWSKI C W,et al.The chemistry of graphene oxide[J].Chemical Society Reviews,2010,39(1):228-240.
[14] CHEN F,CAO Y,JIA D,et al.Solid-state synthesis of ZnS/graphene nanocomposites with enhanced photocatalytic activity[J].Dyes&Pigments,2015,120:8-14.
[15] CHEN F,JIA D,JIN X,et al.A general method for the synthesis of graphene oxide-metal sulfide composites with improved photocatalytic activities[J].Dyes&Pigments,2016,125:142-150.
[16] HU C,ZHAI X,ZHAO Y,et al.Small-sized PdCu nanocapsules on 3Dgraphene for high-performance ethanol oxidation[J].Nanoscale,2014,6(5):2768-2775.
[17] THANGAVEL S,KRISHNAMOORTHY K,KIM S J,et al.Designing ZnS decorated reduced graphene-oxide nanohybrid via microwave route and their application in photocatalysis[J].Journal of Alloys&Compounds,2016,683:456-462.
[18] LIAROS N,TUCEK J,DIMOS K,et al.The effect of the degree of oxidation on broadband nonlinear absorption and ferromagnetic ordering in graphene oxide[J].Nanoscale,2016,8(5):2908-2917.
[19] LIU S,SUN H,SUVOROVA A,et al.One-pot hydrothermal synthesis of ZnO-reduced graphene oxide composites using Zn powders for enhanced photocatalysis[J].Chemical Engineering Journal,2013,229:533-539.
[20] YU L,RUAN H,ZHENG Y,et al.A facile solvothermal method to produce ZnS quantum dots-decorated graphene nanosheets with superior photoactivity[J].Nanotechnology,2013,24(37):375601.
[21] SOOKHAKIAN M,AMIN Y M,BASIRUN W J.Hierarchically ordered macro-mesoporous ZnS microsphere with reduced graphene oxide supporter for a highly efficient photodegradation of methylene blue[J].Applied Surface Science,2013,283:668-677.
[22] YAN W Y,ZHOU Q,CHEN X,et al.Preparation of reduced graphene oxide/nano TiO2 composites by two-step hydrothermal method and their photocatalytic properties[J].Acta Materiae Compositae Sinica,2016,33(1):123-131(in Chinese).