Boustanian, M. (2011) Removal of Cadmium from aqueous solution by windy sand in Sistan plain. Masters thesis, University of Zabol.
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Abstract
Cadmium is heavy metals with harmful effects on human’s life. Therefore, elimination of cadmium ion from water resource is essentially important subject for scientists. For this, can be used from windy sand of Sistani’s plain. Polyvalent captions in the water, especially calcium and magnesium can cause hard water. This is due to the effect of competitive captions in the uptake of cadmium are caused by sand, the effective absorption. The purpose of this study the impact of changes in water absorption isotherms and kinetics and calibration models in removing cadmium from the aqueous solution. For this, the first absorbent Windy Sand from the plains of Sistan collected, and between 125 to 150 microns in size, were prepared. The results showed that the maximum absorption in all samples occurred at pH 5. Efficiency maximum cadmium uptake in distilled water at 80/4% respectively. Water hardness also increased from zero (distilled water) to 320 mg/L, depending on the calcium carbonate, absorption efficiency of the order of 80/4% to 18/66% declined. Equilibrium time in all samples was equal to 1 hour and remained constant with changes water hardness. Kinetic model calibration results showed that in all samples, Ho et al describe the Data absorption better than the other models. Adsorption isotherms fitted models on experimental data showed that for solutions with distilled water and water hardness of 40, 100 and 200 models of Freundlich and Redlich-Peterson, and for water with hardness 320, models of Freundlich isotherms are fitted the data better other than the isotherms model. Powder Activated carbon was bought from Merck of Germany. The results showed that the maximum absorption in all samples occurred at pH 5. Efficiency maximum cadmium uptake in distilled water at 87/04% respectively. Water hardness also increased from zero (distilled water) to 320 mg/L, depending on the calcium carbonate, absorption efficiency of the order of 80/4% to 46/12% declined. Equilibrium time in all samples was equal to 1 hour and remained constant with changes water hardness. Kinetic model calibration results showed that in all samples, Ho et al describe the Data absorption better than the other models. Adsorption isotherms fitted models on experimental data showed that for solutions with distilled water models of Redlich-Peterson, and for water with hardness 40, 100, 200 and 320, models of sips isotherms are fitted the data better other than the isotherms model. In general we can say for both the sorbent with increasing water hardness, the efficiency and capacity of absorption is reduced. The decrease for the lower hardness, is more severe. This means that can reduce water hardness, increased efficiency of absorption. Comparison of absorption capacity of windy sand with activated carbon and other absorbents used in previous studies, indicating good absorption capacity of this adsorbent and it can be used as an inexpensive adsorbent for the removal of cadmium from the water.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | absorption, cadmium, windy sand, active carbon, hardness, kinetic, isotherm |
| Subjects: | S Agriculture > S Agriculture (General) |
| Depositing User: | admin admin1 admin2 |
| Date Deposited: | 04 Dec 2016 08:24 |
| Last Modified: | 04 Dec 2016 08:24 |
| URI: | http://eprints.uoz.ac.ir/id/eprint/1086 |
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