| Autor: |
Şenol, Zeynep Mine, Şimşek, Selçuk |
| Předmět: |
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| Zdroj: |
International Journal of Environmental Analytical Chemistry; Dec2022, Vol. 102 Issue 17, p4926-4940, 15p |
| Abstrakt: |
This paper aims to investigate the adsorption process of a new composite adsorbent prepared from chitosan (Ch) and dolomite (Do) for removal of lead ions from aqueous solutions. The adsorption process of Pb2+ions onto Ch-Do composite adsorbent as initial Pb2+ concentration, solution pH, temperature, contact time and desorption was investigated. From the results, it has been observed that the highest removal efficiency is approximately 89% at contact time of 6 h, initial Pb2+concentration of 500 mg L−1, adsorbent dosage of 100 mg and agitation speed of 150 rpm at pH 4.0. Langmuir isotherm has a better fit with the experimental isotherm data (R2 = 0.920). The maximum Pb2+adsorption capacity from the Langmuir model was found as 0.332 mol kg−1 at 25°C Also, it performs pseudo-second-order superior performance in kinetic behaviour compared to other used kinetic models (R2 = 0.904). Thermodynamic parameters showed the Pb2+adsorption onto Ch-Do was endothermic, spontaneous and possible. The desorption studies have shown that Ch-Do composite adsorbent has a good adsorption/desorption performance for Pb2+ions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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