Title: Adsorption performance of citrate intercalated Mg Al layered double hydroxides on Zn~(2+) in aqueous solution
Abstract: The citrate intercalated Mg Al layered double hydroxides adsorbent was prepared by anion-exchange method. The absorbents prepared were characterized by XRD, IR, SEM, BET and used to adsorb Zn2+ from aqueous solutions. The effects of adsorbent dosage, initial Zn2+ concentration, p H, adsorption temperature on the Zn2+ adsorption rate were investigated. The thermodynamics and kinetics characters were discussed. The results show that the adsorption capacity for Zn2+ is affected by adsorption conditions. The suitable adsorbent dosage is 2-3 g/ L, and p H is weak acidity. Under the above conditions, Zn2+ adsorption efficiency is over 60% at the Zn2+ concentration less than 80 mg/ L, and high temperature is benefit to improve Zn2+ adsorption rate. Adsorption process conforms to the secondary kinetics model, and the isothermal adsorption curve can be described by R-P model. The adsorption process is spontaneous and endothermic.
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
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