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- W2029443146 abstract "Abstract Adsorption of diclofenac and carbamazepine by hexagonal mesoporous silicate (HMS), and the amine- and mercapto-functionalized HMS derivatives (A-HMS and M-HMS, respectively), were evaluated in comparison to that for the mesoporous silicates SBA-15 and MCM-41 plus powdered activated carbon, so as to evaluate the adsorption mechanism, effects of surface functional groups, pH and temperature on the adsorption capacity of these adsorbents. The adsorption of diclofenac and carbamazepine onto all adsorbents was found to decrease rapidly in the first 30 min and reach equilibrium within 4 h. The adsorption kinetics and isotherm data obtained were best described by a pseudo-second-order kinetic rate model and linear isotherm model, respectively. Comparison of the adsorption capacities of HMS, A-HMS and M-HMS suggested that the addition of a mercapto functional group to HMS, increased its adsorption capacity, most likely through increased hydrogen bonding and hydrophobic interactions. The adsorption capacities of these adsorbents were dependent on the pH, being highest at pH 5 due to the optimal electrostatic interactions and hydrogen bonding at this pH. Thermodynamic analysis indicated that the adsorption process was endothermic for all adsorbents. The adsorption capacity of the adsorbent for each solute might be related to the molecular size of the adsorbate." @default.
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- W2029443146 date "2013-01-01" @default.
- W2029443146 modified "2023-09-30" @default.
- W2029443146 title "Mechanistic study of diclofenac and carbamazepine adsorption on functionalized silica-based porous materials" @default.
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- W2029443146 doi "https://doi.org/10.1016/j.cej.2012.10.052" @default.
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