Chemisorption characteristics of 2,4-dichlorophenol in aqueous solution onto different adsorbents

Abstract

The adsorption properties towards 2,4-dichlorophenol of several adsorption resins, viz. ZH-01, ZH-02 and ZH-03 respectively modified with different functional groups, and of granular activated carbon (GAC) have been compared experimentally with those of Amberlite XAD-4. This paper focuses on the static equilibrium adsorption behaviours and the confirmation of chemisorption characteristics. An equation relating the amount chemisorbed and the assumed chemisorption equilibrium concentration of adsorbate in the aqueous solution was established. This shows that the data may be fitted perfectly by the Langmuir equation. The adsorption capacities measured at different temperatures and the static desorption efficiency reveal that the adsorption of 2,4-dichlorophenol from water onto ZH-01, ZH-02, ZH-03 or GAC occurs via a simultaneous process involving physical adsorption and chemical reaction.