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ADSORBENȚI PE BAZĂ DE BENTONITĂ PENTRU ÎNDEPĂRTAREA PIRIDINEI DIN SOLUȚIILE APOASE
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ADSORBENȚI PE BAZĂ DE BENTONITĂ PENTRU ÎNDEPĂRTAREA PIRIDINEI DIN SOLUȚIILE APOASE
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Journal Article
ADSORBENȚI PE BAZĂ DE BENTONITĂ PENTRU ÎNDEPĂRTAREA PIRIDINEI DIN SOLUȚIILE APOASE
2019
Overview
In this paper the adsorption of pyridine, a toxic pollutant, on naturally occurring clay, namely bentonite? was studied at a basic pH and room temperature. Sodium saturated bentonite as well as modified with a cationic surfactant were used and the results compared. The influence of contact time and of the initial pollutant concentration on the pyridine uptake was determined by GC-MS. The adsorbents were characterized before and after being in contact with the pyridine solution by BET specific surface area and porosity, XRD and FTIR analysis. The hydroxyl groups of bentonite in contact with pyridine solution led to protonated pyridine forms which can be responsible for hydrogen bonds formation and electrostatic interactions with the clay and for surfactant removal. Chemical adsorption prevailed over the partition/physical adsorption in both cases and the process followed the pseudo-second-order kinetics with the Freundlich isotherm model representing well the equilibrium adsorption data. The equilibrium adsorptive efficiency was 82.88% for the surfactant modified bentonite and 97.82%o for sodium bentonite, the latter being a better alternative for sequestering pyridine from solution.
Publisher
Foundation for Materials Science and Engineering - \"Serban Solacolu\"
Subject
