2.3. Batch adsorption studies
In order to know the optimum adsorbent concentration corresponding to a maximum binding capacity, the adsorbent dose was varied from 1 to 20 g/L and put into 50 ml of cadmium solution with different concentrations (10, 50 and 100 mg/l). After 24 h of stirring, the solution was centrifuged on 4000 rpm for 10 min and then the concentration of Cd2 + was measured using atomic adsorption spectrophotometer (AAS HITACHI A-2000).
The effect of pH on the adsorption of Cd2 + was studied by using the solution at pH 2 to 10 with initial Cd2 + solutions 10, 50 and 100 mg/l. Acetic acid, HNO3 and NaOH were utilized to adjust the desired pH values of the sample solutions. The duration of the adsorption process was 24 h with a constant stirring rate.
In order to know the influence of shaking time on adsorption capacity, the study was conducted in various shaking times from 30 to 1440 min. Shaker (EYELA CUTE MIXER CM-1000) was employed at 1000 rpm. The phase in which the adsorption capacity becomes stable was considered as an optimum shaking time and implemented for further experiments.
2.3. Batch adsorption studiesIn order to know the optimum adsorbent concentration corresponding to a maximum binding capacity, the adsorbent dose was varied from 1 to 20 g/L and put into 50 ml of cadmium solution with different concentrations (10, 50 and 100 mg/l). After 24 h of stirring, the solution was centrifuged on 4000 rpm for 10 min and then the concentration of Cd2 + was measured using atomic adsorption spectrophotometer (AAS HITACHI A-2000).The effect of pH on the adsorption of Cd2 + was studied by using the solution at pH 2 to 10 with initial Cd2 + solutions 10, 50 and 100 mg/l. Acetic acid, HNO3 and NaOH were utilized to adjust the desired pH values of the sample solutions. The duration of the adsorption process was 24 h with a constant stirring rate.In order to know the influence of shaking time on adsorption capacity, the study was conducted in various shaking times from 30 to 1440 min. Shaker (EYELA CUTE MIXER CM-1000) was employed at 1000 rpm. The phase in which the adsorption capacity becomes stable was considered as an optimum shaking time and implemented for further experiments.
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