title: Development of an adsorbent via chitosan nano-organoclay assembly to remove hexavalent chromium from wastewater.
abstract: This study involves nano-biocomposite (chitosan-nanoclay composite, CNC) preparation using solvent casting method with chitosan and organoclay (Cloisite 20A) and investigation of Cr6+ion adsorption. The influence of contact time, solution pH, initial metal concentration, concentration of the adsorbents and temperature on the removal of Cr6+ions were examined. Langmuir, Freundlich and Scatchard adsorption isotherms were tested. Maximum adsorption capacity of 128.43mg of Cr6+/g for CNC and 21.83mg of Cr6+/g for chitosan were obtained according to the Scatchard adsorption isotherm at pH of 2 and 3, respectively. Obtained results showed that the adsorption data for Cr6+ions on CNC correlated well with the Langmuir isotherm model.
authors.affiliation: Department of Chemical Engineering, Selcuk University, 42079 Konya, Turkey. Electronic address: havvatutar@gmail.com.
authors.forename: Havva Tutar
authors.initials: HT
authors.lastname: Kahraman
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D002857:Chromium / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D049329:Nanostructures / Q000737:chemistry; D013499:Surface Properties; D062065:Wastewater / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D048271:Chitosan; D002857:Chromium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C074702:chromium hexavalent ion
keywords: Adsorption; Chitosan; Hexavalent chromium; Nano-biocomposite; Nanoclay