Adsorption removal of crystal violet from aqueous solution using a metal‐organic frameworks material, copper coordination polymer with dithiooxamide

The potential application of copper coordination polymer with dithiooxamide (H 2 dtoa Cu), one of the metal‐organic frameworks (MOFs) in the adsorption removal of crystal violet (CV) from aqueous solution was studied. Batch adsorption experiments were carried out as a function of initial pH, adsorbent concentration, contact time, initial dye concentration and temperature. The adsorption of CV on H 2 dtoa Cu can be best described by the Langmuir isotherm model ( R 2 > 0.9983) with maximum monolayer adsorption capacity of 165.83, 185.87, and 204.50 mg g −1 at 298, 308, and 318 K, respectively. The kinetics of CV adsorption followed pseudo‐second‐order model ( R 2 > 0.9984) and the chemisorption was proved to be rate‐limiting step. Thermodynamic parameters, the change of free energy (Δ G °), entropy (Δ S °) and enthalpy (Δ H °), showed that the adsorption of CV on H 2 dtoa Cu was feasible, spontaneous and endothermic process. Here we concluded that H 2 dtoa Cu is a promising adsorbent for the removal of harmful dyes from aqueous solution. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013