Jin Jiao, Chen Bozhen, Liu Lang, Liu Ruohua, Qian Guoping, Wei Hui, Zheng Jianlong
School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China.
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
Materials (Basel). 2019 Jun 13;12(12):1910. doi: 10.3390/ma12121910.
TiO pillared montmorillonite (T/M) modifiers have been studied to alleviate the aging of asphalt pavement and degrade automobile exhaust, but the photocatalytic activity of ordinary TiO is not good enough. In this study, in order to improve the photocatalytic performance of T/M, different metal (Ce, Cu, Fe) doped modifiers were prepared based on T/M. Metal doped TiO pillared montmorillonite was prepared by the sol-gel method. The modifier was characterized by X-ray diffraction (XRD) and an Ultraviolet visible (UV-Vis) spectrophotometer. The results show that TiO with different metal ions successfully entered into the layer of organic montmorillonite (OMMT) to form a pillared structure. Compared with the undoped TiO pillared montmorillonite (T/M), the optical absorption edge of the metal doped TiO pillared montmorillonite has an obvious red shift. In addition, the influences of the different content of modifiers on the properties of the original bitumen and catalytic capacities for automobile exhaust were also investigated. The results show that Ce doped TiO (Ce-T/M) pillared montmorillonite has the best improvement in high temperature performance and ultraviolet (UV) resistance of bitumen. In the experiment of automobile exhaust degradation, the degradation law of NO and HC showed Cu-T/M > Ce-T/M > Fe-T/M > T/M. These three kinds of metal ions can effectively improve the photocatalytic degradation efficiency of T/M.
二氧化钛柱撑蒙脱石（T/M）改性剂已被研究用于缓解沥青路面老化和降解汽车尾气，但普通二氧化钛的光催化活性不够好。在本研究中，为了提高T/M的光催化性能，基于T/M制备了不同金属（铈、铜、铁）掺杂的改性剂。采用溶胶-凝胶法制备了金属掺杂二氧化钛柱撑蒙脱石。通过X射线衍射（XRD）和紫外可见（UV-Vis）分光光度计对改性剂进行了表征。结果表明，不同金属离子的二氧化钛成功进入有机蒙脱石（OMMT）层形成柱撑结构。与未掺杂的二氧化钛柱撑蒙脱石（T/M）相比，金属掺杂二氧化钛柱撑蒙脱石的光吸收边缘有明显的红移。此外，还研究了不同含量改性剂对原沥青性能和汽车尾气催化能力的影响。结果表明，铈掺杂二氧化钛（Ce-T/M）柱撑蒙脱石对沥青的高温性能和抗紫外线（UV）性能改善效果最佳。在汽车尾气降解实验中，NO和HC的降解规律为Cu-T/M > Ce-T/M > Fe-T/M > T/M。这三种金属离子能有效提高T/M的光催化降解效率。
