Abstract

Maaza Lamia^*1, Djafri Fatiha², Bouchekara  Mohammed¹ and Djafri Ayada³

DOI : http://dx.doi.org/10.13005/ojc/320118

In this work we report the preparation of ZSM-5 (pyrr) with molar composition: 0.2057 Na₂O - 0.00266 Al₂O₃ – SiO₂ –0.68 Pyrr (pyrrolidine) - 40 H₂O – 0.12H₂SO₄by hydrothermal synthesis method. The sample is characterized using IR spectra, MEB and XRD. The removal of Methyl Green (MG) dye from aqueous solutions onto ZSM-5(pyrr.), is examined under various experimental conditions (dyes concentration, amount H-ZSM-5(pyrr.), temperature, pH and contact times).The adsorbed amount increased with increasing amount dye, amount H-ZSM-5(pyrr.), time, temperature and PH. The linear correlations of Langmuir and Freundlich isotherms are determined. The experimental results show that we have model Langmuir. Free energy ∆G° enthalpy ∆H°, entropy ∆S° and activation energy E_a are determined. The ∆H°, ∆G° andE_a values indicated that   the adsorption of methyl green dye onto H- ZSM-5(pyrr.) is exothermicphysisorption process. Kinetics analyses are conducted using    pseudo first-order, second-order and the intraparticle diffusion models. The results showed that the   adsorption kinetics was controlled by a pseudo second-order model.

Hydrothermal synthesis; zeolithe ZSM-5; Isotherm adsorption; Methyl green; IR; SEM

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