Laboratory-based investigation into the removal behaviour of asphalt in porous asphalt mixture on zinc ions from road runoff
Date
2017
Authors
Zhao, Y.
Zhao, C.
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Journal article
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Chiang Mai Journal of Science, 2017; 44(4):1601-1610
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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 Zn 2+ 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 Zn 2+ 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 Zn 2+ w 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 Zn 2+ in road runoff.
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Copyright 2017 Chiang Mai University