利用化学浴沉积法合成的ZnO为前驱体,并加入不同含量的氧化石墨烯(GO),再采用经过300℃氮气氛围煅烧法,最终得到ZnO-热还原氧化石墨烯复合物(ZnO/RGO)。对合成样品进行一系列分析测试,并测试了样品的光催化性能。结果表明:掺杂0.8%-RGO的ZnO/RGO(ZRG)复合物的光催化活性最高,可见光照4h对亚甲基蓝(MB)的降解率达到87.7%。同时,探讨了不同条件下对光催化降解亚甲基蓝(MB)的影响,通过捕获剂实验表明,光催化降解MB的活性物种主要是超氧自由基O-2·和空穴h+。
Zinc oxide (ZnO) synthesized by chemical bath precipitation method was used as the precursor,and added graphene oxide (GO) with different loadings.The zinc oxide-thermal reduction graphene oxide composite (ZnO/RGO) was obtained by calcination at 300℃ in a nitrogen atmosphere.The composition,morphology and structure were thoroughly characterized by a series of analysis tests.And the photocatalytic activity of the as prepared samples was also studied.The performance of the photocatalytic removal for methylene blue(MB) under visible light irradiation indicated the ZnO/RGO composites with 0.8%-RGO showed removal performance to pure ZnO,and the rate of degradation attached at 87.7%.Meanwhile,different conditions on photocatalytic degradation of MB were also discussed.The experiments of capture agents showed that the active species of photocatalytic degradation of MB was mainly superoxide radical O-2· and the hole h+.
[1] Jang E S,Won J H,Hwang S J,et al.Fine tuning of the face orientation of ZnO crystals to optimize their photocatalytic activity[J].Advanced Materials,2006,18(18):3309-3312.
[2] Chakrabarti S,Dutta B K.Photocatalytic degradation of model textile dyes in astewater using ZnO as semiconductor catalyst[J].Journal of Hazardous Materials,2004,112:269-278.
[3] Kislov N,Lahiri J,Varma H,et al.Photocatalytic degradation of methyl orange over single crystalline ZnO:orientation dependence of photoactivity and photostability of ZnO[J].Langmuir,2009,25:3310-3315.
[4] Labiadh H,Ben Chaabane T,Balan L,et al.Preparation of Cu-doped ZnS QDs/TiO2 nanocomposites with high photocatalytic activity[J].Applied Catalysis B:Environmental,2014,144:29-35.
[5] Achouri F,Corbel S,Aboulaich A,et al.Aqueous synthesis and enhanced photocatalytic activity of ZnO/Fe2O3 heterostructures[J].Journal of Physics and Chemistry of Solids,2014,75:1081-1087.
[6] Li L,Liu X,Zhang Y,et al.Visible-light photochemical activity of heterostructured core-shell materials composed of selected ternary titanates and ferrites coated by TiO2[J].ACS Applied Materials & Interfaces,2013,5:5064-5071.
[7] Dong S,Feng J,Fan M,et al.Recent developments in heterogeneous photocatalytic water treatment using visible light-responsive photocatalysts:a review[J].RSC Advances,2015,5:14610-14630.
[8] Li F,Ding Y,Gao P X,et al.Single-crystal hexagonal disks and rings of ZnO:low-temperature,large-scale synthesisand growth mechanism[J].Angewandte Chemie International Edition,2004,43:5238-5242.
[9] Yin H,Yu K,Hu J,et al.Novel photoluminescence properties and enhanced photocatalytic activities for V2O5-loaded ZnO nanorods[J].Dalton Transactions,2015,44:4671-4678.
[10] Jiang Q,Liu Y,Kan H,et al.Microwave-assisted synthesis of hexagonal structure ZnO micro-tubes[J].Materials Letters,2012,81:198-201.
[11] Zhang H,Yang D,Ji Y,et al.Low temperature synthesis of flowerlike ZnO nanostructures by cetyltrimethylammonium bromide-assisted hydrothermal process[J].Journal of Physical Chemistry B,2014,108:3955-3958.
[12] Wang H H,Xie C S,Zeng D W.Controlled growth of ZnO by Adding H2O[J].Journal of Crystal Growth,2005,277:372-377.
[13] Li G R,Hu T,Pan G L,et al.Morphology-function relationship of ZnO:polar planes,oxygen vacancies,and activity[J].The Journal of Physical Chemistry C,2008,112:11859-11864.
[14] Xu L P,Hu Y L,Pelligra C,et al.ZnO with different morphologies synthesized by solvothermal methods for enhanced photocatalytic activity[J].Chemistry of Materials,2009,21:2875-2885.
[15] Jang E S,Won J H,Hwang S J,et al.Fine tuning of the face orientation of ZnO crystals to optimize their photocatalytic activity[J].Advanced Materials,2006,18:3309-3312.
[16] Liu X,Ye L,Liu S,et al.Photocatalytic reduction of CO2 by ZnO micro/nanomaterials with different morphologies and ratios of {0001 facets[J].Scientific Reports,2016,6(1):38474.
[17] Mclaren Anna,Valdes-Solis Teresa,Li Guoqiang,et al.Shape and size effects of ZnO nanocrystals on photocatalytic activity[J].Journal of the American Chemical Society,2009,131(35):12540-12541.
[18] Meyer J C,Geim A K,Katsnelson M I,et al.The structure of suspended graphene sheets[J].Nature,2007,446:60-63.
[19] Castro Neto A H,Guinea F,Peres N M R,et al.The electronic properties of graphene[J].Reviews of Modern Physics,2009,81:109-162.
[20] Qin J,Zhang X,Xue Y,et al.A facile synthesis of nanorods of ZnO/graphene oxide composites with enhanced photocatalytic activity[J].Applied Surface Science,2014,321:226-232.
[21] Moussa H,Girot E,Mozet K,et al.ZnO rods/reduced graphene oxide composites prepared via a solvothermal reaction for efficient sunlight-driven photocatalysis[J].Applied Catalysis B:Environmental,2016,185:11-21.
[22] Zhou X,Shi T,Zhou H,Hydrothermal preparation of ZnO-reduced graphene oxide hybrid with high performance in photocatalytic degradation[J].Applied Surface Science,2012,258:6204-6211.
[23] Lightcap I V,Kosel T H,Kamat P V.Anchoring semiconductor and metal nanoparticles on a two-dimensional catalyst mat storing and shuttling electrons with reduced graphene oxide[J].Nano Letters,2010,10:577-583.
[24] Xu T,Zhang L,Cheng H,et al.Significantly enhanced photocatalytic performance of ZnO via graphene hybridization and the mechanism study[J].Applied Catalysis B:Environmental,2011,101:382-387.
[25] Tian S Q,Yang F,Zeng D W,et al.Solution-processed gas sensors based on ZnO nanorods array with an exposed (0001) facet for enhanced gas-sensing properties[J].Journal of Physical Chemistry C,2012,116:10586-10591.
[26] Yuan Xiaoya,Wu Xue,Feng Zijuan,et al.Facile synthesis of heterojunctioned ZnO/Bi2S3 nanocomposites for enhanced photocatalytic reduction of aqueous Cr(Ⅵ) under visible-light irradiation[J].Catalysts,2019,9(7):624-638.
[27] Chen Zhang,Zhang Nan,Xu Yijun.Synthesis of graphene-ZnO nanorod nanocomposites with improved photoactivity and anti-photocorrosion[J].Cryst Eng Comm,2013,15:3022-3030.
[28] Moussa Hatem,Girot Emilien,Mozet Kevin,et al.ZnO rods/reduced graphene oxide composites prepared via a solvothermal reaction for efficient sunlight-driven photocatalysis[J].Applied Catalysis B:Environmental,2016,185:11-21.
[29] Xue Bing,Zou Yingquan.Uniform distribution of ZnO nanoparticles on the surface of graphene and its enhanced photocatalytic performance[J].Applied Surface Science,2018,440:1123-1129.
[30] Ibrahim M M,Ahmed S A,Khairou K S,et al.Carbon nanotube/titanium nanotube composites loaded platinum nanoparticles as high performance photocatalysts[J].Applied Catalysis A General,2014,475:90-97.
[31] Nagata T,Todoriki S,Masumizu T,et al.Levels of active oxygen species are controlled by ascorbic acid and anthocyanin in arabidopsis[J].Journal of Agricultural and Food Chemistry,2003,51(10):2992-2999.
[32] Li Baojun,Cao Huaqiang.ZnO@graphene composite with enhanced performance for the removal of dye from water[J].Journal of Materials Chemistry,2011,21:3346-3349.
[33] Sygellou Lamprini,Paterakis Georgios,Galiotis Costas,et al.Work function tuning of reduced graphene oxide thin films[J].The Journal of Physical Chemistry C,2015,120(1):281-290.
基金资助
国家自然科学基金(51402030);重庆市基础科学与前沿技术研究专项基金(cstc2017jcyjBX0028);重庆市教育委员会科学技术研究项目(KJZD-K201800703)
PDF
