反蛋白石型黑TiO_(2)光子晶体的制备与光催化性能  

Preparation and Photocatalytic Properties of Black TiO_(2) Photonic Crystals with Inverse Opal Structure

作　　者：张保宁 赵美馨 侯鹏 孟曙光 孙琼[1] ZHANG Baoning;ZHAO Meixin;HOU Peng;MENG Shuguang;SUN Qiong(College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2024年第2期64-71,共8页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金青年基金项目(51402161).

摘　　要：采用硬模板法制备了反蛋白石型TiO_(2)光子晶体,对其氢化处理后得到黑TiO_(2)光子晶体(H-IOTiO_(2))。通过X射线衍射、扫描电子显微镜、X射线光电子能谱分析等手段,确定了H-IOTiO_(2)表面存在大量Ti^(3+)和O空位缺陷,导致吸收光谱的红移。催化剂的光催化活性采用有机染料的光催化降解来评价。发现染料罗丹明B(RhB)的降解符合拟一级动力学,H-IOTiO_(2)表现出最强的光催化活性(速率常数0.033min^(-1)),分别是是未热处理催化剂TiO_(2)(速率常数0.014min^(-1))和空气热处理催化剂(速率常数0.028min^(-1))活性的2.4和1.2倍。自由基淬灭实验证实:H-IOTiO_(2)在光照下能够产生更多的活性氧化基团,特别是·O_(2)^(-)和·OH自由基;证实了H-IOTiO_(2)表面缺陷的存在可以显著加速表面氧还原过程,最终体现为样品光催化活性的显著提升。In this research,the TiO_(2) photonic crystal with reverse opal structure was prepared by a hard template method,and then was hydrogenated to obtain the black TiO_(2) photonic crystal(H-IO TiO_(2)).From some characterizations including X-ray diffraction patterns,scanning electron microscopy and X-ray photoelectron spectroscopy,a large number of Ti^(3+)ions and O vacancy defects were found on the surface of H-IO TiO_(2),which can result in an obvious red shift of the absorption spectrum.The photocatalytic activity of the catalyst was evaluated by the photocatalytic degradation of organic dyes.It was found that the degradation of dye rhodamine B(RhB)accorded with the pseudo first-order kinetics,and H-IO TiO_(2) showed the strongest photocatalytic activity(0.033 min^(-1) for the rate constant),which was 2.4 and 1.2 times of untreated TiO_(2)(0.014 min^(-1) for the rate constant)and air heat-treated catalyst(0.028 min^(-1) for the rate constant),respectively.Free radical quenching experiments showed that more oxidizing species could be produced by H-IO TiO_(2) under light,especially·O_(2)^(-) and·OH radicals.In addition,it was also proved that the existence of surface defects in H-IO TiO_(2) could significantly accelerate the oxygen reduction process.As a result,the photocatalytic activity of H-IO TiO_(2) was greatly improved.

关 键 词：光子晶体 黑TiO_(2) 表面氢化 氧空位缺陷 光催化性能 

分 类 号：O643.3[理学—物理化学]