Hu Tingting, Feng Panpan, Guo Liping, Chu Hongqi, Liu Fusheng
State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
Nanomaterials (Basel). 2023 Jul 21;13(14):2125. doi: 10.3390/nano13142125.
A series of TiO@TiO core-shell heterojunction composite photocatalysts with different internal electric fields were synthesized using simple heat treatment methods. The synthesized TiO@TiO core-shell heterojunction composites were characterized by means of SEM, XRD, PL, UV-Vis, BET, SPV, TEM and other related analytical techniques. Tetracycline (TC) was used as the degradation target to evaluate the photocatalytic performance of the synthesized TiO@TiO core-shell heterojunction composites. The relevant test results show that the photocatalytic performance of the optimized materials has been significantly enhanced compared to TiO, while the photocatalytic degradation rate has increased from 28% to 70.1%. After verification via several different testing and characterization techniques, the excellent catalytic performance is attributed to the efficient separation efficiency of the photogenerated charge carriers derived from the built-in electric field formed between TiO and TiO. When the recombination of electrons and holes is occupied, more charges are generated to reach the surface of the photocatalyst, thereby improving the photocatalytic degradation efficiency. Thus, this work provides a universal strategy to enhance the photocatalytic performance of TiO by coupling it with TiO to build an internal electric field.
采用简单的热处理方法合成了一系列具有不同内部电场的TiO@TiO核壳异质结复合光催化剂。通过扫描电子显微镜（SEM）、X射线衍射（XRD）、光致发光（PL）、紫外可见光谱（UV-Vis）、比表面积分析（BET）、表面光电压谱（SPV）、透射电子显微镜（TEM）等相关分析技术对合成的TiO@TiO核壳异质结复合材料进行了表征。以四环素（TC）作为降解目标物，评价合成的TiO@TiO核壳异质结复合材料的光催化性能。相关测试结果表明，与TiO相比，优化后的材料的光催化性能得到了显著提高，光催化降解率从28%提高到了70.1%。通过几种不同的测试和表征技术验证后，优异的催化性能归因于TiO和TiO之间形成的内建电场对光生电荷载流子的高效分离效率。当电子和空穴的复合被抑制时，会产生更多的电荷到达光催化剂表面，从而提高光催化降解效率。因此，这项工作提供了一种通过将TiO与TiO耦合构建内建电场来提高TiO光催化性能的通用策略。
