Adsorption characteristics of dimethyl phthalate by modified zeolite


ABSTRACT:

Zeolite was modified in sodium hydroxide solution in order to improve the adsorption performance. The characterization of the alkali-modified zeolite by scanning electron microscope (SEM) was displayed. In the study, In order to obtain the optimum conditions for adsorption of Dimethyl Phthalate (DMP), resulting in a better removal efficiency, parameters such as the dosage of modified zeolite, adsorption time, adsorption temperature and initial concentration were examined. Results showed that the optimal adsorption conditions were dosage was 100 mg/L, adsorption time was 120 min, the adsorption temperature was 35 ℃ and the initial concentration was 10.0 mg/L. Under the condition, the maximum adsorption efficiency was 99.0%. The analysis of equilibrium isotherms data was used Langmuir and Freundlich models. The kinetics adsorption of DMP can be described by the Lagergren pseudo-second-order model better than the Lagergren pseudo-first-order model.

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