Adsorption of naphthalene by Ag ions-exchanged sorbents

• 1、 College of Environmental Sciences and Engineering, Nankai University /Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria /Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Tianjin 300071, China

Abstract：In this paper, adsorption behaviors of naphthalene to conventional water treatment sorbents before and after exchanged with silver ions were evaluated using batch experiments. Results showed that, after exchanged with silver ions, zeolite and silica had little effect on the sorption of naphthalene, and the sorption capacity of naphthalene to activated carbon was reduced, whereas the sorption capacity of naphthalene to cation exchange resin Amberlyst 15was enhanced. Different sorption trends observed with Ag ions exchanged sorbents might correlated with the structure and surface properties of these sorbents, in which silver ions attached to the sorbent surface not only change the sorbent surface hydrophobicity and the internal pore structure, but also the silver ions loaded certain sorbents could enhance naphthalene sorption via special π complexation and Lewis acid-base interactions. Results of this study could give basic theoretical fundamentals of silver ions in the water treatment process for PAHs removal, as well as the influence of silver ions on the environmental behavior of PAHs.

Keywords： environmental science adsorption silver ions naphthalene