Adsorption of naphthalene by Ag ions-exchanged resins via π-complexation

• 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：Adsorption behaviors of naphthalene and 1,3-dichlorobenzene to macro-porous cation exchange resin Amberlyst 15 before and after exchanged with silver ions were evaluated using batch experiments. Results showed that, within the concentration range of this experiment, the apparent sorption distribution coefficient Kd of naphthalene were significantly enhanced after Amberlyst 15 exchanged with silver ions, while the influence on 1,3-dichlorobenzene was negligible. Besides of the van der Waals forces, the silver ions loaded Amberlyst 15 could supply empty track to interact with π-donor naphthalene via cation-π complexation, in which energy is stronger than the van der Waals force, lead to the adsorption enhancement of naphthalene; Whereas, for non-π-donor, the adsorption of 1,3-dichlorobenzene could not able to have a significant influence after Amberlyst 15 exchanged with silver ions. As a π complexation adsorbent, the Amberlyst 15 exchange with silver ions can provide important technical reference for exploring the removal of π-donor organic pollutants in wastewater treatment.

Keywords： environmental science adsorption π-complexation Ag ions exchanged Amberlyst 15 naphthalene