Adsorption feasibility in the Cr(total) ions removal from waste printing developer

Abstract

In this article, the technical feasibility of various commercial adsorbents (activated carbon, clinoptilolite, and their mixture) for removal of Cr(total) ions from waste printing developer has been represent. Experimental tests were performed in laboratory batch mode. The adsorption data were analyzed using the Freundlich, Langmuir and Dubinin-Kaganer-Radushkevich (DKR) isotherm models. It was found that the Freundlich isotherm gave better results than the Langmiur and DKR models, with the corresponding correlation coefficients (R 2): 0.981, 0.996 and 0.997 for mixture (NZ+AC), AC and NZ, respectively. The adsorption capacities of Cr(total) ions followed the order: (NZ+AC)>AC>NZ. The adsorption efficiencies of Cr(total) ions removal were 38.5 to 39.9%. Due to easy availability and good efficiency, the mixture of clinoptilolite and activated carbon is an ideal adsorbents for removal of Cr(total) ions from waste printing developer. © 2012 Global NEST Printed in Greece. All rights reserved.