g-C_3N_4/TiO_2复合光催化剂制备及活性研究
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摘要
光催化技术可直接利用太阳光实现有机污染物的深度降解,传统光催化剂二氧化钛存在可见光转换效率低,光生电子-空穴对容易复合等缺点。采用简单的化学法制备了二维纳米片层石墨相氮化碳(g-C_3N_4)包覆二氧化钛纳米粒子复合光催化剂(g-C_3N_4/TiO_2),利用XRD、UV-Vis、SEM、PL等手段对光催化剂的结构性能进行了表征,并考察了复合材料在紫外、可见光下降解亚甲基蓝(MB)、苯酚及双酚A的性能。研究结果表明:二维纳米片层g-C_3N_4的引入可以实现复合材料对可见光的吸收利用,并且可以极大地提高光生电子空穴在界面处的分离效率。在紫外光照射20 min后,5%g-C_3N_4/TiO_2复合物对染料亚甲基蓝(MB)的降解率高达90%,并且在重复使用5次之后仍具有较高的光催化性能。
The photocatalytic technology can directly utilize the sunlight to realize the deep degradation of organic pollutants.The conventional photocatalyst TiO_2 has the disadvantages of low visible light conversion efficiency and easy recombination of photogenerated electron-hole pairs.In this paper,a two-dimensional nano-sheet g-C_3N_4 coated TiO_2 nanoparticle composite photocatalyst(designated g-C_3N_4/TiO_2) was prepared by simple chemical method.The structure and performance of the composite were characterized by XRD,UV-Vis,SEM,and PL.Meanwhile,the properties of the composites degrading methylene blue(MB), phenol and bisphenol A under ultraviolet and visible light irradiation were investigated.The results showed that the introduction of two-dimensional nano-sheet g-C_3N_4 not only could realize the absorption and utilization of visible light,but also greatly improve the separation efficiency of photogenerated electron holes at the interface. After the UV irradiation for 20 min,the degradation rate of dye MB by 5% g-C_3N_4/TiO_2 composite was as high as 90%,and it still had high photocatalytic performance after repeated use for five times.
The photocatalytic technology can directly utilize the sunlight to realize the deep degradation of organic pollutants.The conventional photocatalyst TiO_2 has the disadvantages of low visible light conversion efficiency and easy recombination of photogenerated electron-hole pairs.In this paper,a two-dimensional nano-sheet g-C_3N_4 coated TiO_2 nanoparticle composite photocatalyst(designated g-C_3N_4/TiO_2) was prepared by simple chemical method.The structure and performance of the composite were characterized by XRD,UV-Vis,SEM,and PL.Meanwhile,the properties of the composites degrading methylene blue(MB), phenol and bisphenol A under ultraviolet and visible light irradiation were investigated.The results showed that the introduction of two-dimensional nano-sheet g-C_3N_4 not only could realize the absorption and utilization of visible light,but also greatly improve the separation efficiency of photogenerated electron holes at the interface. After the UV irradiation for 20 min,the degradation rate of dye MB by 5% g-C_3N_4/TiO_2 composite was as high as 90%,and it still had high photocatalytic performance after repeated use for five times.
引文
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[2]Gao Chao,Wang Jin,Xu Hangxun,et al.Coordination chemistry in the design of heterogeneous photocatalysts[J].Chemical Society Reviews,2017,46(10):2799-2823.
[3]Chen Biao,Meng Yuhuan,Sha Junwei,et al.Preparation of Mo S2/Ti O2based nanocomposites for photocatalysis and rechargeable batteries:progress,challenges,and perspective[J].Nanoscale,2018,10:34-68.
[4]Chen Xiaobo,Liu Lei,Huang Fuqiang.Black titanium dioxide(Ti O2)nanomaterials[J].Chemical Society Reviews,2015,44(7):1861-1885.
[5]Stepan Kment,Francesca Riboni,Sarka Pausova,et al.Photoanodes based on Ti O2andα-Fe2O3for solar water splitting-superior role of1D nanoarchitectures and of combined heterostructures[J].Chemical Society Reviews,2017,46(12):3716-3769.
[6]齐跃红,刘利,梁英华,等.类石墨相C3N4复合光催化剂[J].化学进展,2015,27(1):38-46.
[7]张金水,王博,王心晨.氮化碳聚合物半导体光催化[J].化学进展,2014,26(1):19-29.
[8]Liu Jian,Wang Hongqiang,Antonietti Markus.Graphitic carbon nitride“reloaded”:emerging applications beyond(photo)catalysis[J].Chemical Society Reviews,2016,45:2308-2326.
[9]Ong Wee-Jun,Tan Lling-Lling,Ng Yun Hau,et al.Graphitic carbon nitride(g-C3N4)-based photocatalysts for artificial photosynthesis and environmental remediation:are we a step closer to achieving sustainability[J].Chemical Reviews,2016,116(12):7159-7329.
[10]徐建华,谈玲华,寇波,等.类石墨相C3N4光催化剂改性研究[J].化学进展,2016,28(1):131-148.
[11]Hu Shaozheng,Li Fayun,Fan Zhiping,et al.Band gap-tunable potassium doped graphitic carbon nitride with enhanced mineralization ability[J].Dalton Transactions,2015,44(3):1084-1092.
[12]Yu Jiaguo,Wang Shuhan,Low Jingxiang,et al.Enhanced photocatalytic performance of direct Z-scheme g-C3N4-Ti O2photocatalysts for the decomposition of formaldehyde in air[J].Physical Chemistry Chemical Physics,2013,15(39):16883-16890.
[13]Zhang Mo,Yao Wenqing,Lv Yanhui,et al.Enhancement of mineralization ability of C3N4via a lower valence position by a tetracyanoquinodimethane organic semiconductor[J].Journal of Materials Chemistry A,2014,2(29):11432-11438.
[14]Wang Jiajia,Tang Lin,Zeng Guangming,et al.Plasmonic Bi metal deposition and g-C3N4coating on Bi2WO6microspheres for efficient visible-light photocatalysis[J].ACS Sustainable Chemistry&Engineering,2017,5(1):1062-1072.