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Extractive efficacy of microwave synthesized zeolitic material for acephate: Equilibrium and kinetics

Shah Bhavna A. (Department of Chemistry, Veer Narmad South Gujarat University, Surat, Gujarat, India)
Shah Ajay V. (Science and Humanity Department, Polytechnic, Vidyabharti trust, Umrakh, Bardoli, Gujarat, India)
Jadav Piyush Y. (Department of Chemistry, Veer Narmad South Gujarat University, Surat, Gujarat, India)

Present investigation deals with the utilization of Bagasse fly ash (BFA) a sugar industry waste and Zeolitic material (MZBFA), synthesized from BFA by combined conventional and microwave reflux method as adsorbents for the extraction of Acephate (ACP), an organophosphorus pesticide from aqueous solution. The synthesized adsorbents were characterized using various techniques such as FTIR, PXRD and SEM. The effect of various experimental parameters has been investigated using a batch adsorption technique for the extraction of ACP. The extent of removal is increased with decrease in initial ACP concentration and particle size of the adsorbent. Adsorption was fast and the equilibrium was established within 90 min. Pseudo-first-order, Pseudo-second-order, Bangham and intra-particle particle diffusion models were used to fit the experimental data. Pseudo-second-order rate equation was able to provide realistic description of adsorption kinetics. Equilibrium isotherms were analyzed by Freundlich, Langmuir, Dubinin-Radushkevich and Tempkin isotherm equations. Langmuir equation was found to best represent the equilibrium data. The thermodynamic study showed that adsorption of ACP on MZBFA is higher than that on BFA. The results indicate that such Zeolitic material could be employed as low cost alternatives to Bagasse fly ash in wastewater treatment for the removal of pesticides.

Keywords: ACP, adsorption, isotherm, kinetics, zeolite