Dyes, the most important environmental contaminants in industrial and textile wastewaters, are considered to be extremely toxic for human health and environment as well. The aim of present study was to determine the adsorption kinetics and equilibrium of reactive Red 198 dye (RR198), taken from aqueous solution of the Cuttlefish bone powder as a natural biosorbent. The target adsorbent was prepared in laboratory conditions and pulverized by ASTM standard sieves (60-100 mesh). The effects of adsorbent dose (1 to 2.5 g/100 ml), pH (4 to 10), initial dye concentration (25 and 50 mg/l) and contact time (10 to 240 min) were investigated on the adsorption of dye. The results were analyzed with Langmuir and Freundlich isotherm models. Results have shown that the increase of adsorbent dose and retention time led to an increase in the efficiency of dye removal. While, an increase in the initial dye concentration led to decreased dye removal. The adsorption isotherm for initial dye concentration (50 mg/l) was in good concordance with the Langmuir and Freundlich model (R2>0.95), while the Langmuir model had higher agreement with our experimental data (R2 = 0.981). The adsorption kinetic studies revealed that the adsorption of RR198 was rapid and complied with pseudo-second order kinetics (R2 = 0.997) and the kinetic constants were 0.039 and 0.033 g/mg.min for the concentrations of 25 and 50 mg/l, respectively.

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