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 (R2): 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.
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