采用光还原方法将氧化石墨烯负载在极性面占有的氧化锌六棱盘上合成出氧化锌-还原石墨烯复合光催化材料。在紫外-可见光辐照下,该复合材料的光催化降解亚甲基蓝活性得到明显提高。光催化性能的提高主要归因于还原氧化石墨烯对光生电子的捕获抑制了电子和空穴的复合以及还原氧化石墨烯对亚甲基蓝分子的有效吸附。还原氧化石墨烯的最优负载量约为2%,同时负载的还原石墨烯对光的吸收可在一定程度上减少复合材料对光子的利用率。
Graphene oxide was loaded onto ZnO disks with dominant polar facets and photo-reduced to form ZnO-RGO photocat-alysts. Their photocatalytic activity for methylene blue degradation is remarkably improved under UV-visible light irradiation. The enhanced activity is ascribed to the trapping effect of RGO for photoexcited electrons that inhibits electron/hole recombination and to the adsorption effect of RGO for methylene blue to increase its local concentration. The optimal loading of the RGO is ca. 2 mass%, above which light absorption by the RGO decreases the photo utilization efficiency.
参考文献
[1] | Wei Zhao;Wanhong Ma;Chuncheng Chen;Jincai Zhao;Zhigang Shuai .Efficient Degradation of Toxic Organic Pollutants with Ni_2O_3/TiO_(2-x)B_x under Visible Irradiation[J].Journal of the American Chemical Society,2004(15):4782-4783. |
[2] | Yang J;Chen C C;Ji H W et al.Mechanism of TiO2-assisted photocatalytic degradation of dyes under visible irradiation:Pho-toelectrocatalytic study by TiO2-film electrodes[J].Journal of Physical Chemistry B,2005,109(46):21900-21907. |
[3] | 邵霞,陆文聪,张睿,潘峰.以四氯化钛和钛酸四丁酯为前驱体的TiO2/C杂化气凝胶光催化性能比较[J].新型炭材料,2013(05):378-384. |
[4] | M. Faisal,Sher Bahadar Khan,Mohammed M. Rahman,Aslam Jamal,Kalsoom Akhtar,M.M. Abdullah.Role of ZnO-CeO_2 Nanostructures as a Photo-catalyst and Chemi-sensor[J].材料科学技术学报:英文版,2011(07):594-600. |
[5] | Hao Ming Chen;Chih Kai Chen;Yu-Chuan Chang .Quantum Dot Monolayer Sensitized ZnO Nanowire-Array Photoelectrodes: True Efficiency for Water Splitting[J].Angewandte Chemie,2010(34):5966-5969. |
[6] | Quanjun Xiang;Jiaguo Yu;Mietek Jaroniec .Graphene-based semiconductor photocatalysts[J].Chemical Society Reviews,2012(2):782-796. |
[7] | Novoselov K S;Geim A K;Morozov S V et al.Electric field effect in atomically thin carbon films[J].SCIENCE,2004,306(5696):666-669. |
[8] | Na Li;Gang Liu;Chao Zhen;Feng Li;Lili Zhang;Hui-Ming Cheng .Battery Performance and Photocatalytic Activity of Mesoporous Anatase TiO_2 Nanospheres/Graphene Composites by Template-Free Self-Assembly[J].Advanced functional materials,2011(9):1717-1722. |
[9] | Sampa Chakrabarti;Binay K. Dutta .Photocatalytic degradation of model textile dyes in wastewater using ZnO as semiconductor catalyst[J].Journal of hazardous materials,2004(3):269-278. |
[10] | Tongguang Xu;Liwu Zhang;Hanyun Cheng .Significantly enhanced photocatalytic performance of ZnO via graphene hybridization and the mechanism study[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2011(3/4):382-387. |
[11] | Zeng, J.H.;Jin, B.B.;Wang, Y.F. .Facet enhanced photocatalytic effect with uniform single-crystalline zinc oxide nanodisks[J].Chemical Physics Letters,2009(1/3):90-95. |
[12] | Xuewen Wang;Lichang Yin;Gang Liu;Lianzhou Wang;Riichiro Saito;Gao Qing (Max) Lu;Hui-Ming Cheng .Polar interface-induced improvement in high photocatalytic hydrogen evolution over ZnO-CdS heterostructures[J].Energy & environmental science: EES,2011(10):3976-3979. |
[13] | Ofuchi H;Jin Z W;Fukumura T et al.Fluorescence EXAFS study on local structures around Mn and Fe atoms doped in ZnO[J].Physica Scripta,2005,T115:614-615. |
[14] | 刘晓雪,程文娟,马学鸣,石旺舟.Ni掺杂ZnO薄膜的荧光特性[J].光谱学与光谱分析,2006(11):2069-2071. |
[15] | Li, B.;Liu, T.;Wang, Y.;Wang, Z..ZnO/graphene-oxide nanocomposite with remarkably enhanced visible-light-driven photocatalytic performance[J].Journal of Colloid and Interface Science,2012:114-121. |
[16] | Qiu-Ping Luo;Xiao-Yun Yu;Bing-Xin Lei .Reduced Graphene Oxide-Hierarchical ZnO Hollow Sphere Composites with Enhanced Photocurrent and Photocatalytic Activity[J].The journal of physical chemistry, C. Nanomaterials and interfaces,2012(14):8111-8117. |
[17] | Dongying Fu;Gaoyi Han;Yunzhen Chang;Jianhua Dong .The synthesis and properties of ZnO-graphene nano hybrid for photodegradation of organic pollutant in water[J].Materials Chemistry and Physics,2012(2/3):673-681. |
[18] | 王晓丹,周宁琳,汪炜燕,汤毅达,章峻,沈健.镧修饰羧基化氧石墨烯的抑菌性能[J].新型炭材料,2012(05):385-392. |
[19] | Zhao, J.;Pei, S.;Ren, W.;Gao, L.;Cheng, H.-M. .Efficient preparation of large-area graphene oxide sheets for transparent conductive films[J].ACS nano,2010(9):5245-5252. |
[20] | Li, B.;Zhang, X.;Li, X.;Wang, L.;Han, R.;Liu, B.;Zheng, W.;Li, X.;Liu, Y. .Photo-assisted preparation and patterning of large-area reduced graphene oxide-TiO_2 conductive thin film[J].Chemical communications,2010(20):3499-3501. |
[21] | Tsuji, I;Kato, H;Kobayashi, H;Kudo, A .Photocatalytic H-2 evolution reaction from aqueous solutions over band structure-controlled (AgIn)(x)Zn2(1-x)S2 solid solution photocatalysts with visible-light response and their surface nanostructures[J].Journal of the American Chemical Society,2004(41):13406-13413. |
[22] | Sampa Chakrabarti;Binay K. Dutta .Photocatalytic degradation of model textile dyes in wastewater using ZnO as semiconductor catalyst[J].Journal of hazardous materials,2004(3):269-278. |
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