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Open AccessArticle

A Study on Modified Bitumen with Metal Doped Nano-TiO2 Pillared Montmorillonite

1
School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China
2
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(12), 1910; https://doi.org/10.3390/ma12121910
Received: 10 May 2019 / Revised: 6 June 2019 / Accepted: 12 June 2019 / Published: 13 June 2019
(This article belongs to the Section Construction and Building Materials)
TiO2 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 TiO2 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 TiO2 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 TiO2 with different metal ions successfully entered into the layer of organic montmorillonite (OMMT) to form a pillared structure. Compared with the undoped TiO2 pillared montmorillonite (T/M), the optical absorption edge of the metal doped TiO2 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 TiO2 (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. View Full-Text
Keywords: bitumen; montmorillonite; metals doped; automobile exhaust; photocatalytic bitumen; montmorillonite; metals doped; automobile exhaust; photocatalytic
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MDPI and ACS Style

Jin, J.; Chen, B.; Liu, L.; Liu, R.; Qian, G.; Wei, H.; Zheng, J. A Study on Modified Bitumen with Metal Doped Nano-TiO2 Pillared Montmorillonite. Materials 2019, 12, 1910.

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