ZnO纳米棒阵列的可控制备、改性及其光催化性能研究
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摘要
通过一步电沉积法在不锈钢网基底上制备ZnO纳米棒阵列,然后采用水热法在ZnO纳米棒上包覆C,制得C/ZnO纳米复合结构。借助SEM、XRD、TEM、UV-Vis等对相关样品的形貌、结构、物相组成及光催化性能进行表征。结果表明,在沉积电压为-1.0 V的条件下所制备的ZnO纳米棒阵列具有长度适中、分布均匀及垂直取向的结构特点,纳米棒平均直径和长度分别为150 nm和1.35μm,在紫外光照射下其对亚甲基蓝的降解效率可达95.1%,催化稳定性良好;制得的C/ZnO纳米复合结构在可见光照射下对亚甲基蓝的降解效率相比ZnO纳米棒阵列有明显提升,并具有较高的催化稳定性。
ZnO nanorod arrays were prepared on stainless steel mesh substrates by one-step electrodeposition, then carbon coatings were synthesized on the surface of ZnO nanorod arrays via hydrothermal method, and the C/ZnO nanocomposites were therefore obtained. With the aid of SEM, XRD, TEM and UV-Vis, the morphology, microstructure, phase composition and photocatalytic properties of the samples were characterized. The results show that ZnO nanorod arrays prepared at the deposition voltage of-1.0 v exhibit moderate length, uniformly distributed and vertically oriented structure, with the average diameter of 150 nm and length of 1.35 μm. The degradation rate of methylene blue solution catalyzed by ZnO nanorod arrays under UV-irradiation condition can reach 95.1%, and the ZnO nanorod arrays also show good catalytic stability. Compared with the catalysis of ZnO nanorod arrays, the degradation efficiency of methylene blue solution catalyzed by obtained C/ZnO composites is significantly improved with remarkable stability under visible light irradiation condition.
ZnO nanorod arrays were prepared on stainless steel mesh substrates by one-step electrodeposition, then carbon coatings were synthesized on the surface of ZnO nanorod arrays via hydrothermal method, and the C/ZnO nanocomposites were therefore obtained. With the aid of SEM, XRD, TEM and UV-Vis, the morphology, microstructure, phase composition and photocatalytic properties of the samples were characterized. The results show that ZnO nanorod arrays prepared at the deposition voltage of-1.0 v exhibit moderate length, uniformly distributed and vertically oriented structure, with the average diameter of 150 nm and length of 1.35 μm. The degradation rate of methylene blue solution catalyzed by ZnO nanorod arrays under UV-irradiation condition can reach 95.1%, and the ZnO nanorod arrays also show good catalytic stability. Compared with the catalysis of ZnO nanorod arrays, the degradation efficiency of methylene blue solution catalyzed by obtained C/ZnO composites is significantly improved with remarkable stability under visible light irradiation condition.
引文
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[2] Chankhanittha T,Nanan S.Hydrothermal synthesis,characterization and enhanced photocatalytic performance of ZnO toward degradation of organic azo dye[J].Materials Letters,2018,226:79-82.
[3] Lee K M,Lai C W,Ngai K S,et al.Recent developments of zinc oxide based photocatalyst in water treatment technology:a review[J].Water Research,2016,88:428-448.
[4] Kumaresan N,Ramamurthi K,Babu R R,et al.Hydrothermally grown ZnO nanoparticles for effective photocatalytic activity[J].Applied Surface Science,2017,418:138-146.
[5] Lv J G,Sun Y,Zhao M,et al.Rectifying properties of ZnO thin films deposited on FTO by electrodeposition technique[J].Applied Surface Science,2016,366:348-352.
[6] Qi K Z,Cheng B,Yu J G,et al.Review on the improvement of the photocatalytic and antibacterial activities of ZnO[J].Journal of Alloys and Compounds,2017,727:792-820.
[7] Martínez-Vargas B L,Cruz-Ramírez M,Díaz-Real J A,et al.Synthesis and characterization of n-ZnO/p-MnO nanocomposites for the photocatalytic degradation of anthracene[J].Journal of Photochemistry and Photobiology A:Chemistry,2019,369:85-96.
[8] Wang M,Xu J Y,Sun T M,et al.Facile photochemical synthesis of hierarchical cake-like ZnO/Ag composites with enhanced visible-light photocatalytic activities[J].Materials Letters,2018,219:236-239.
[9] Samadi M,Zirak M,Naseri A,et al.Recent progress on doped ZnO nanostructures for visible-light photocatalysis[J].Thin Solid Films,2016,605:2-19.
[10] Osman H,Su Z,Ma X L,et al.Synthesis of ZnO/C nanocomposites with enhanced visible light photocatalytic activity[J].Ceramics International,2016,42(8):10237-10241.
[11] Bozetine H,Wang Q,Barras A,et al.Green chemistry approach for the synthesis of ZnO-carbon dots nanocomposites with good photocatalytic properties under visible light[J].Journal of Colloid and Interface Science,2016,465:286-294.
[12] Perillo P M,Atia M N.C-doped ZnO nanorods for photocatalytic degradation of p-aminobenzoic acid under sunlight[J].Nano-Structures and Nano-Objects,2017,10:125-130.
[13] Huo P W,Li J Z,Ye Z F,et al.Fabricated temperature sensitive photocatalyst of PNIPAM@ ZnO/C for controllable photocatalytic activity[J].Chinese Chemical Letters,2017,28(12):2259-2262.
[14] Lu H,Zhang M,Guo M.Controllable electrodeposition of ZnO nanorod arrays on flexible stainless steel mesh substrate for photocatalytic degradation of Rhodamine B[J].Applied Surface Science,2014,317:672-681.
[15] Lu H,Zhai X Y,Liu W W,et al.Electrodeposition of hierarchical ZnO nanorod arrays on flexible stainless steel mesh for dye-sensitized solar cell[J].Thin Solid Films,2015,586:46-53.
[16] Chen T,Yu S W,Fang X X,et al.Enhanced photocatalytic activity of C@ZnO core-shell nanostructures and its photoluminescence property[J].Applied Surface Science,2016,389:303-310.
[17] Zhu K X,Jin C Q,Jian Z Y,et al.Significantly enhanced photocatalytic performance of mesoporous C@ZnO hollow nanospheres via suppressing charge recombination[J].Chemical Physics Letters,2019,716:102-105.