Paper Type |
Contributed Paper |
Title |
Laboratory-based Investigation into the Removal Behaviour of Asphalt in Porous Asphalt Mixture on Zinc Ions from Road Runoff |
Author |
Yao Zhao*, Chen Zhao, Kelly Hill and Xun Qian Xu |
Email |
zhaoyaonfu@163.com |
Abstract: This paper was to investigate the removal behaviour of asphalt in pore-space on dissolved zinc from road runoff based on laboratory experiments. Asphalt films were soaked with different initial concentrations of Zn2+ solutions over 720 h. The surface chemical state of asphalt films before and after experiment were examined by X-ray photoelectron spectroscopy(XPS), while solution samples were analysed for Zn2+ concentrations by an inductively coupled plasma atomic emission spectrometer(ICP-AES). Experimental data were further analysed using both kinetics and adsorption isotherms. It confirmed that Zn2+ in solution had been adsorbed to the asphalt film. The initial stage of adsorption matched both the first-order equation and the parabolic diffusion equation; whereas the entire adsorption process was found fit the second-order equation. Moreover, the adsorptive behaviour satisfied the Freundlich model. These provide evidence to support the adsorption ability of asphalt on the pore-walls in porous asphalt with regard to Zn2+ in road runoff. |
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Start & End Page |
1601 - 1610 |
Received Date |
2015-07-05 |
Revised Date |
|
Accepted Date |
2016-01-24 |
Full Text |
Download |
Keyword |
Asphalt, Porous asphalt pavement, Adsorption, Road runoff, Heavy metals |
Volume |
Vol.44 No.4 (October 2017) |
DOI |
|
Citation |
Zhao Y., Zhao C., Hill K. and Xu X.Q., Laboratory-based Investigation into the Removal Behaviour of Asphalt in Porous Asphalt Mixture on Zinc Ions from Road Runoff, Chiang Mai J. Sci., 2017; 44(4): 1601-1610. |
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