脉冲激光喷涂一步合成黑色二氧化钛复合涂层
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摘要
为实现黑色纳米TiO_2有效负载,提高实际应用能力,本研究提出了脉冲激光溅射喷涂的方法。在石英玻璃基底上一步制备了非晶分子筛和金红石型TiO_2纳米晶的黑色复合涂层,表征了复合涂层表面形貌,测定了复合涂层粉末的光谱吸收性能、物相结构、化学价态以及光催化性能。研究结果表明:涂层为2～5μm球体堆积成的多孔结构,在整个可见光区具有较强的吸收能力。脉冲激光溅射喷涂过程中,分子筛高温熔融急冷转变为非晶态结构,TiO_2则由锐钛矿型转变为金红石型;其中Ti~(4+)离子部分被还原为Ti~(3+)离子,缩小了禁带宽度。脉冲激光溅射喷涂技术实现了黑色纳米TiO_2快速负载,且在全光谱和可见光条件下仍表现出良好的光催化能力。
To achieve effective load of black TiO_2 nanoparticles and improve the practical application ability, the pulsed laser spraying was proposed. The composite coating was prepared on quartz glass substrate, which consisted of amorphous molecular sieve and rutile TiO_2 nanocrystals. The surface morphology of the composite coating was characterized, and a series of test about composite coating powder was conducted including absorption properties, phase structure, chemical valence, and photocatalytic properties. The results show that the coating is porous structure packed with 2-5 μm ball and has strong absorptive capacity in the visible region. In the process of pulsed laser sputtering, the molecular sieve changed to amorphous structure, and TiO_2 changed from anatase to rutile type. Ti~(4+) ion was reduced to Ti~(3+) ion, which resulted in reduced band-gap. The pulsed laser spraying technology achieves the fast load of the black nano TiO_2, which still has good photocatalytic ability under the full spectrum and visible light conditions.
To achieve effective load of black TiO_2 nanoparticles and improve the practical application ability, the pulsed laser spraying was proposed. The composite coating was prepared on quartz glass substrate, which consisted of amorphous molecular sieve and rutile TiO_2 nanocrystals. The surface morphology of the composite coating was characterized, and a series of test about composite coating powder was conducted including absorption properties, phase structure, chemical valence, and photocatalytic properties. The results show that the coating is porous structure packed with 2-5 μm ball and has strong absorptive capacity in the visible region. In the process of pulsed laser sputtering, the molecular sieve changed to amorphous structure, and TiO_2 changed from anatase to rutile type. Ti~(4+) ion was reduced to Ti~(3+) ion, which resulted in reduced band-gap. The pulsed laser spraying technology achieves the fast load of the black nano TiO_2, which still has good photocatalytic ability under the full spectrum and visible light conditions.
引文
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[2]RENGUI LI,YUXIANG WENG,XIN ZHOU,et al.Achieving overall water splitting using titanium dioxide-based photocatalysts of different phases.Energy&Environmental Science,2015,8:2377-2382.
[3]ZHAO DAN-DAN,YU YAN-LONG,GAO DONG-ZI,et al.Properties and photocatalytic activity of rutile TiO2 nanosheets.Journal of Inorganic Materials,2016,31(1):1-6.
[4]CHEN XIAOBO,BURDA CLEMENS.The electronic origin of the visible-light absorption properties of C-,N-and S-doped TiO2nanomaterials.J.Am.Chem.Soc.,2008,130(15):5018-5019.
[5]DIAZ-REAL JA,DUBED-BANDOMO GC,GALINDO-DE-LA-ROSA J,et al.Evaluation of transferable TiO2 nanotube membranes as electrocatalyst support for methanol photoelectrooxidation.Applied Catalysis B:Environmental,2017,222:18-25.
[6]LORENZO GRAZIANI,ENRICO QUAGLIARINI,MARCODORAZIO.The role of roughness and porosity on the self-cleaning and anti-biofouling efficiency of TiO2-Cu and TiO2-Ag nanocoatings applied on fired bricks.Construction and Building Materials,2016,129:116-124.
[7]CHEN XIAOBO,LIU LEI,YU PETER Y,et al.Increasing solar absorption for photocatalysis with black hydrogenated titanium dioxide nanocrystals.Science,2011,311:746-750.
[8]DING HONG,JI WEN-WEN,LIU YU-LI,et al.Review of Loading methods of nano-titania-loaded.Chemical Industry Times,2010,24(2):61-66.
[9]郑伟涛.薄膜材料与薄膜技术.北京:化学工业出版社,2004:68-73.
[10]唐普洪.脉冲激光沉积TiNAIN纳米多层膜制备及其变形机理研讨.杭州:浙江工业大学博士学位论文,2010.
[11]WANG XIAO-TONG,LI YAN-MIN,CHEN YU-JING,et al.Preparation,characterization and visible-light photocatalytic activity of Ti3+self-doped TiO2 nanoparticles.Journal of Ludong University(Natural Science Edition),2015,31(1):44-51.
[12]UNO M,KOSUGA A,OKUI M,et al.Photoelectrochemical study of lanthanide titanium oxides,Ln2Ti2O7(Ln=La,Sm,and Gd).J.Alloys Compounds,2005,400(1/2):270-275.
[13]LI MING-HUI,SONG WU-LIN,ZENG LEI,et al.Effect of oxygen vacancies on the photocatalytic activity of titanium dioxide and the advances in related research.Materials Review A,2014,28(8):22-26.
[14]MING KONG,YUANZHI LI,XIONG CHENG,et al.Tuning the relative concentration ratio of bulk defects to surface defects in TiO2 nanocrystals leads to high photocatalytic efficiency.J.Am.Chem.Soc.,2011,133:16414-16417.