Yüzey Modifiyeli Şeker Pancarı Küspesi Adsorbentle Cr(Vı) İyon Adsorpsiyonunun Kesikli ve Sürekli Sistemlerde İncelenmesi

Abstract

In this thesis, the adsorption of chromium (VI) cationic ions which are present in textile wastewater on to dried sugar beet pulp and modified sugar beet pulp by CTAB was studied in batch stirred and continuous packed bed column systems. The optimum starting pH values were calculated as 2 for both batch stirred and continuous packed bed column systems. The optimum particle size was found as 707-1000 µm for pH 2 for both systems also. For both adsorbents, the adsorption capacity increased with the increase in the initial chromium (VI) concentration up to 250 mg/L at 1 g/L adsorbent concentration. Under these conditions, it was found that the adsorption of chromium (VI) to dried and CTAB-modified SBP adsorbents was 66.8 mg/g and 84.2 mg/g, respectively. Treatment with CTAB was found to increase the capacity of the SBK adsorbent by about 20%. In the second part of the experimental studies, packed bed column investigation with adsorbent particles in the size range of 707-1000 µm was carried out at pH 2 with both adsorbents. It was observed that the capacity and performance of the column were increased by increasing the feeding chromium (VI) concentration to 250 mg / L at a flow rate of 0.7 ml/min which is the most suitable for both adsorbents. In these conditions, it was observed that chromium (VI) adsorption to the dried and CTAB-modified SBP adsorbents was 32.0 mg / g and 37.2 mg / g, respectively, and the treatment with CTAB increased the capacity of the SBP adsorbent by about 15%. In the last part of the studies, the equilibrium and kinetic modeling of chromium (VI) adsorption for the batch stirred and packed bed column systems were made and the model constants were found. It was observed that the balance was better defined with Langmuir model in both systems. It was determined that the adsorption kinetics of chromium (VI) adsorbed to both adsorbents matched the second order kinetic model in the batch system. Thomas and Yoon-Nelson models were used for estimating the breakthrough curves at different flow rates and different feed concentrations for both adsorbents in the packed bed column.