本文選題：鈣鈦礦氧化物　切入點：反應機理　出處：《西南石油大學》2017年碩士論文　論文類型：學位論文

【摘要】：ABO3型鈣鈦礦是鈣鈦礦家族中的重要成員,由于其A位元素的多變性,可表現出豐富的物理、化學性質,進而被廣泛應用于氣體傳感器,電容器,光致制動器,染料敏化電池以及光催化劑。本文探索了使用納米片狀銳鈦礦型TiO2作為鈦源,模板法水熱合成ATiO3(A = Ba,Pb和Sr)。在該水熱條件下,由于A位元素的不同,產物ATiO3表現出不同的結構與性能。通過X射線衍射(XRD),掃描電子顯微鏡(SEM)、透射電子顯微鏡(TEM),選區(qū)電子衍射(SAED)等表征分析方法,對產物材料進行結構與形貌分析。采用時間分辨X射線衍射圖譜,對樣品進行生長機理的研究,通過分析擬合結果得出在所合成的樣品 BaTiO3,PbTiO3,SrTiO3,BaxPb1-iO3 和 SrxPb1xTiO3 中,PbTiO3的生長速率最慢。在ATiO3生長過程中,以A位元素在固相表面的擴散以及固/液界面的反應占主要控制因素。在探索所有自合成樣品的光催化性能過程中,發(fā)現它們均表現出光降解低濃度氮氧化合物的活性。其中,PbTiO3在全光譜和可見光(λ420nm)下活性最優(yōu)主要歸因于其光生載流子遷移速率較其他產物的更大;BaTiO3在NO的轉化過程中表現出良好的選擇性,其氧化產物中理想產物(NO3-或NO2-)所占比例最大。在光催化還原H2O制氫的實驗中,SrTiO3的活性最優(yōu),且經過綠色無毒的CDs表面改性后,還原活性增強了 30%。希望本研究工作提供的有關ATiO3的光催化活性及選擇性能的信息,對后期ATiO3的表面改性提供更多的線索。
[Abstract]:ABO3 perovskite is an important member of the perovskite family, the variability of the A elements, can exhibit rich physical and chemical properties, and is widely used in gas sensors, capacitors, light induced brake, dye sensitized solar cell and photocatalyst. This paper explores the use of nano scale anatase TiO2 as titanium source template method, hydrothermal synthesis of ATiO3 (A = Ba, Pb and Sr). In the hydrothermal conditions, due to the different elements of A, ATiO3 showed the product structure and properties of different. By means of X ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), constituency electron diffraction (SAED) characterization analysis method, analyzed the structure and morphology of the product material. By using time-resolved X ray diffraction, studied the growth mechanism of the sample, through the analysis of the simulation results obtained in BaTiO3 samples, the synthesis of PbTiO3, SrTiO3, BaxPb1 -iO3 and SrxPb1xTiO3, the PbTiO3 growth rate of the slowest. In the growth process of ATiO3, the A element in the diffusion of solid surface and solid / liquid interface reaction for main control factors. In the exploration of all self synthesized samples the photocatalytic performance of the process, found that they showed the degradation of low concentration of nitrogen oxides the activity of PbTiO3. Among them, the full spectrum of visible light (lambda 420nm) under optimal activity is mainly attributed to the optical carrier migration rate than other products more; BaTiO3 showed good selectivity in the NO conversion process, the ideal product in the oxidation products (NO3- or NO2-) in the largest proportion. The photocatalytic reduction of H2O hydrogen production experiments, the optimal activity of SrTiO3, and through the green non-toxic CDs after surface modification, 30%. reduction activity enhanced photocatalytic activity and selectivity in the hope that this research work will provide the ATiO3 to the Information provides more clues to the surface modification of the later ATiO3.

【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O643.36

【參考文獻】

相關期刊論文 前4條

1 嚴欣;趙翠連;周義龍;吳振軍;袁劍民;李文生;;高光催化活性ZnTiO_3的合成與表征（英文）[J];Transactions of Nonferrous Metals Society of China;2015年07期

2 王小鳳;曹迎楠;孫少瑞;黃自力;張海軍;張少偉;;Au/Ni雙金屬納米顆粒的制備及其催化制氫活性[J];稀有金屬材料與工程;2015年03期

3 展紅全;江向平;李小紅;羅志云;陳超;李月明;;鈦酸鋇納米顆粒聚集球的形成機理[J];物理化學學報;2011年12期

4 施爾畏，夏長泰，仲維卓，華素坤，，馮楚德，馮錫淇，張申;水熱法制備的BaTiO_3微晶粒的特性[J];無機材料學報;1995年04期

本文編號：1628969