Ti_(3)C_(2)/N-TiO_(2)复合材料的制备及吸附/光催化去除污染物性能  

Preparation of Ti_(3)C_(2)/N-TiO_(2) Composites and Their Adsorption/Photocatalytic Properties for Pollutant Removal

作　　者：程余磊 周沁锋 张子璇 张鹏飞 孙明轩[1] Cheng Yulei;Zhou Qinfeng;Zhang Zixuan;Zhang Pengfei;Sun Mingxuan(School of Materials Science and Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学材料科学与工程学院,上海201620

出　　处：《微纳电子技术》2023年第3期361-367,共7页Micronanoelectronic Technology

基　　金：上海市教育委员会科研创新项目(15ZZ092);2021年国家级大学生创新训练项目(202110856019)。

摘　　要：首先利用煅烧TiN制备了N-TiO_(2),并采用HF溶液腐蚀Ti3AlC2合成了Ti_(3)C_(2),然后将两者以不同质量比值进行混合,通过超声法构建了一系列Ti_(3)C_(2)/N-TiO_(2)复合材料。采用X射线衍射仪、透射电子显微镜、X射线光电子能谱仪、紫外-可见分光光度计等多种表征手段对样品的物相、形貌和组成进行了分析。以罗丹明B水溶液为模拟污染物,研究了样品对污染物的吸附性能和光催化降解性能。结果表明,6%Ti_(3)C_(2)/N-TiO_(2)复合材料显示出最好的污染物吸附性能和可见光光催化降解性能,其光催化降解污染物效率分别是10%Ti_(3)C_(2)/N-TiO_(2)、2%Ti_(3)C_(2)/N-TiO_(2)和N-TiO_(2)的1.2、1.4和1.9倍。催化降解污染物过程中的主要活性物质是·OH和·O-2,且三次循环实验表明Ti_(3)C_(2)/N-TiO_(2)具有较好的光催化稳定性能。Ti_(3)C_(2)的引入拓展了复合材料的吸收带边,增强了可见光的吸收强度,促进了光生电子和空穴的分离,从而提高了Ti_(3)C_(2)/N-TiO_(2)复合体系的光催化性能。N-TiO_(2)was prepared by calcination of TiN,and Ti_(3)C_(2)was synthesized from Ti3AlC2 etched with HF solution.Then,a series of Ti_(3)C_(2)/N-TiO_(2)composites were constructed by ultrasound treatment of N-TiO_(2)and Ti_(3)C_(2)with different mass ratios.The phase,morphology,and composition of the as-prepared samples were analyzed by characterizations of the X-ray diffractometer,transmission electron microscope,X-ray photoelectron spectroscope,ultravioletvisible spectrophotometer,etc.Rhodamine B(Rh-B)solution was selected as the target pollutant to investigate the adsorption and photocatalytic degradation performances of the asprepared samples.The results show that 6%Ti_(3)C_(2)/N-TiO_(2)composites exhibit the best adsorption and visible-light photocatalytic degradation performances towards pollutants.The photocatalytic degradation efficiency of 6%Ti_(3)C_(2)/N-TiO_(2)composites is 1.2,1.4,and 1.9 times those of 10%Ti_(3)C_(2)/N-TiO_(2),2%Ti_(3)C_(2)/N-TiO_(2)and N-TiO_(2),respectively.·OH and·O-2 are confirmed to be the main active species for photodegradation.And three-cycle experiments show that Ti_(3)C_(2)/N-TiO_(2)composites present good photocatalytic stability.The introduction of Ti_(3)C_(2)extends the absorption band edge,enhances the absorption intensity of visible light,and facilitates the separation of photogenerated electrons and holes of the composites,thus improving the photocatalytic performance of the Ti_(3)C_(2)/N-TiO_(2)composite system.

关 键 词：氮掺杂TiO_(2) Ti_(3)C_(2)MXene 复合材料 光催化 污染物降解 

分 类 号：TB33[一般工业技术—材料科学与工程]