| Title | Effect of pH on adsorption of Cr(VI), K(I) and NH4(I) ions onto natural zeolites and bentonites |
|---|---|
| ID_Doc | 64845 |
| Authors | Bakalár, T |
| Title | Effect of pH on adsorption of Cr(VI), K(I) and NH4(I) ions onto natural zeolites and bentonites |
| Year | 2021 |
| Published | |
| Abstract | Compounds of chromium, ammonium, and potassium are commonly found in the environment due to industrial activities and can negatively influence its quality if occurring in high concentrations. Natural zeolites and bentonites from local sources can be efficiently used for the adsorption of these pollutants from water. In the study, the influence of pH on the adsorption process of Cr(VI), K(I) and NH4(I) from K2CrO4, K2Cr2O7 and (NH4)2CrO4 in a single compound system separately for each adsorbate onto zeolites and bentonites in their natural form, without chemical modification, was studied. The adsorption experiments were carried out in a batch processes in the pH range from 2 to 9. The Langmuir isotherm provided the best correlation for the adsorption onto both the zeolites and bentonites. The maximum sorption capacities for Cr(VI), K(I) and NH4(I) adsorption were 12.88 mg g-1 onto bentonite from (NH4)2CrO4, 2.57 mg g-1 onto zeolite from K2CrO4 and 4.09 mg g-1 onto zeolite from (NH4)2CrO4, respectively. The adsorption capacities of bentonites were higher than the adsorption capacities of zeolites from all the used adsorbates. There is a strong influence of pH on the maximum sorption capacities of the zeolites and bentonites whereas the optimum pH for the best removal of the pollutants was 5-7. The influence of particle size distribution and the composition of the adsorbents is not as significant as the influence of the counter ion. |
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