Removal of chromium(VI) from a dilute aqueous solution was investigated using the sorption technique. Locally available wool from merino sheep was used as an sorbent for the removal of chromium(VI). The influence of operating parameters such as sorbent amount, contact time, pH and initial metal concentration in solution on the sorption capacity were studied in a batch system. Optimum conditions for sorption were determined as wool amount, 50 g L-1 ; pH 2; and contact time, 20 min. It was seen that when initial metal concentration in solution was increased, the uptake of Cr(VI) increased. Chromium(VI) sorption for different types of wool was also examined. Kinetic data were processed using the intraparticle diffusion model. The results suggest that the Cr(VI) uptake process seems to be controlled by external mass transfer at earlier stages and by intraparticle diffusion at later stages.
In this study, the removal of heavy metals (Cu(II), Ni(II), Zn(II), and total Cr) from real industrial wastewater (IWW), being taken from galvanotechnic industry, by means of polyacrylic acid (Aac) hydrogel was investigated. The effects of adsorbent dosage, contact time, and shaking speed on heavy metal removal from wastewater were monitored using real wastewater. In addition, adsorption isotherm and kinetics studies for adsorption of heavy metals were studied in this study. The adsorption capacities of Aac hydrogel for Cu(II), Ni (II), Zn(II), and total Cr were achieved as 2.74, 1.91, 6.83, and 6.61 mg/g, respectively. The removal of heavy metals using Aac hydrogel was fitted with Freundlich isotherm and pseudo-second-order kinetic models. Thermodynamic studies indicated that the process was exothermic and spontaneous. According to these results, Aac hydrogel is suitable adsorbents for removing heavy metals from IWW.
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