Adsorption of Cd(II) Ion on Aragonite Calcium Carbonate Crystals
Calcium carbonate was prepared with urea hydrolytic method, and was characterized by Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffract meter (XRD) and Ratio of surface area porosity analyzer. It is revealed that the Calcium carbonate obtained here is aragonite calcium carbonate crystals. The adsorption of Cd(II) ion onto aragonite calcium carbonate crystals were studied via investigating parameters as effect of contact time, dosage of aragonite calcium carbonate crystals and initial heavy metal concentration using static batch adsorption experiments. The results reveal that the removal rate of Cd(II) ion is 83% under the following conditions: temperature as 25 ℃, contact time as 120 min, initial concentration of the Cd(II) ion as 100 mg/L, and dosage of aragonite calcium carbonate crystals as 0.6 g/L. The adsorption capacity reaches 200 mg/g. Meanwhile the results suggest that the adsorption of the Cd(II) ion by the aragonite calcium carbonate crystals well follows the pseudo-second-order kinetics model, and the Langmuir isotherm model provides a good fit to the experimental data.
KeywordsAragonite calcium carbonate crystals Cd(II) ion Adsorption
This work was supported by the National Natural Science Foundation of China (21476005, 21176005), and the Fund from Beijing Municipal Selected Excellent Overseas Scholars Project.
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