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Submitted: 05 Jun 2020
Revision: 15 Jun 2020
Accepted: 24 Jun 2020
ePublished: 29 Jun 2020
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Avicenna J Environ Health Eng. 2020;7(1): 35-46.
doi: 10.34172/ajehe.2020.06
  Abstract View: 134
  PDF Download: 110

Original Article

Adsorptive Removal of Methylene Blue in Aqueous Solutions Through Raw and Modified Cantaloupe Peel Wastes: Kinetic and Isotherm Study

Mohammad Reza Samarghandi 1 ORCID logo, Kazem Godini 2 ORCID logo, Ghasem Azarian 3 ORCID logo, Ali Reza Ehsani 1, Hassan Zolghadrnasab 1* ORCID logo

1 Department of Environmental Health Engineering, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran.
2 Environmental Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran.
3 Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, IR Iran.

Abstract

Since large amounts of agricultural wastes are produced in Iran and these wastes have lignocellulosic nature, the current study was performed to survey the adsorption performance of methylene blue dye from aqueous solutions by means of raw and modified cantaloupe peel. The adsorbents used were characterized using techniques like scanning electron microscope (SEM), as well as Fourier transform infrared spectroscopy (FTIR). In this study, the effects of a few key variables including pH, reaction time, dye concentration, adsorbent dosage and temperature on the adsorption performance were investigated. Optimum values were attained at 0.04 and 0.08 g doses of modified and raw cantaloupe peel, pH of 7 after mixing for 120 and 90 minutes for raw and modified cantaloupe peel, respectively. The equilibrium information was fitted to the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich equations and the respective data for all models were tested. An increase in adsorbent dose and temperature caused the efficiency to rise. The mechanism and rate of adsorption were ascertained by analyzing the experimental data at various contact times according to traditional kinetic equations: pseudo-first-order and second order, Elovich, and intra-particle diffusion. The findings illustrated that the data accorded closely with the pseudo-second-order model. Moreover, it was found that these wastes can be applied to remove environmental pollutants, particularly methylene blue dye.
Keywords: Effluent, Methylene blue removal, Cantaloupe peel waste, Kinetic, Isotherm,
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Abstract View: 134

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PDF Download: 110

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