Adsorption mechanism of phenolic compounds from aqueous solution on hypercrosslinked polymeric adsorbent

Article type: Research Article

Authors: WANG, Xue-jiang | ZHAO, Jian-fu | XIA, Si-qing | LI, Ai-min | CHEN, Ling

Affiliations: State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai 200092, China | School of Environment, Nanjing University, Nanjing 210093, China

Note: [] Corresponding author. E-mail: [email protected]

Abstract: The adsorption of two phenols, namely, phenol and salicylic acid (SA) onto a water-compatible hypercrosslinked polymeric resin (NJ-8) were studied in terms of pseudo-second-order and first order mechanisms for chemical sorption as well as an intraparticle diffusion mechanism process. Kinetic analysis showed that the intraparticle diffusion process was the essential rate-controlling step. The activation energies of sorption have also been evaluated with the pseudo-second-order and intraparticle diffusion constants, respectively. Adsorption equilibrium data were well fitted by the Langmuir, Freundlich and Redlich-Peterson isotherms. Adsorption was exothermic and basically of a type of transition between physical and chemical character. The sorption capacity was higher for SA due to its more hydrophobic. Phenol has a higher adsorption enthalpy since it could form stronger hydrogen bonding on NJ-8.

Keywords: hypercrosslinked polystyrene resin, phenol, salicylic acid (SA), adsorption, enthalpy

Journal: Journal of Environmental Sciences, vol. 16, no. 6, pp. 919-924, 2004