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Simultaneous determination of cation exchange capacity and surface area of acid activated bentonite powders by methylene blue sorption |
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| Authors: | Nilgün YenerCengiz Biçer Mü?erref Önal Yüksel Sar?kaya |
| Institution: | a Dokuz Eylül University, Medical School, Department of Biochemistry, ?nciralt?, ?zmir, Turkey b Ege Döngü Ltd. ?ti., 4. Sanayi Sitesi, 29/18, Bornova, ?zmir, Turkey c Ankara University, Faculty of Science, Department of Chemistry, Tando?an, 06100 Ankara, Turkey |
| Abstract: | To distinguish the ion exchanged and physically adsorbed methylene blue cations (MB+) on ionic surfaces, acid activated bentonite samples were used as porous adsorbents. A natural calcium bentonite (CaB) sample from Enez/Edirne, Turkey, was acid activated at 90 °C for 16 h with various HCl/CaB ratios. The irreversible exchange and physical adsorption of MB+ cations on the ionic solids have simultaneously occurred. The ion exchanged (mex) and physically adsorbed (mad) MB+ contents were obtained as the values of sorption capacity at c = 0 and the increase to a plateaus of adsorption isotherms, respectively. The mad value was taken to be monolayer adsorption capacity. Cation exchange capacity (CEC) and specific surface area (SMB) for each sample were calculated from the mex and mad values, respectively. Also, the BET specific surface areas (SBET) and pore size distribution were determined from low temperature nitrogen adsorption/desorption data. A linear correlation between the SMB and SBET values was found. |
| Keywords: | Methylene blue Bentonite Smectite Acid activation Cation exchange capacity Surface area |
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