title: Removal of Direct Red 12B by garlic peel as a cheap adsorbent: kinetics, thermodynamic and equilibrium isotherms study of removal.
abstract: The removal of dyes from industrial waste is very important from health and hygiene point of view and for environmental protection. In this work, efficiency and performance of garlic peel (GP) adsorbent for the removal of Direct Red 12B (DR12B) from wastewater was investigated. The influence of variables including pH, concentration of the dye and amount of adsorbent, particle size, contact time and temperature on the dye removal has been investigated. It was observed that the pseudo-second-order kinetic model fits better with good correlation coefficient and the equilibrium data fitted well with the Langmuir model. More than 99% removal efficiency was obtained within 25min at adsorbent dose of 0.2g per 50ml for initial dye concentration of 50mgL(-1). Calculation of various thermodynamic parameters such as, Gibb's free energy, entropy and enthalpy of the on-going adsorption process indicate feasibility and endothermic nature of DR12B adsorption.
authors.affiliation: Young Researchers and Elite Club, Gachsaran Branch, Islamic Azad University, Gachsaran 75818-63875, Iran. Electronic address: ar_asfaram@yahoo.com.
authors.forename: A
authors.initials: A
authors.lastname: Asfaram
authors.affiliation: Department of Chemistry, College of Science, Shahid Chamran University, P.O. Box 6135743337, Ahvaz, Iran.
authors.forename: M R
authors.initials: MR
authors.lastname: Fathi
authors.affiliation: Cellular and Molecular Research Center, Yasuj University of Medical Science, Yasuj, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Khodadoust
authors.affiliation: Cellular and Molecular Research Center, Yasuj University of Medical Science, Yasuj, Iran.
authors.forename: M
authors.initials: M
authors.lastname: Naraki
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D005737:Garlic / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification
chemical_list: D001391:Azo Compounds; D062065:Wastewater; C501278:Direct Red 12B
keywords: Adsorption; Batch technique; Direct Red 12B; Garlic peel; Kinetics; Thermodynamic