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    Adsorption of Picric Acid from Aqueous Solution by the Weakly Basic Adsorbent Amber lite IRA-67
    (Amer Chemical Soc, 2010) Uslu, Hasan; Demir, Goeksel
    The presence of nitrophenols in wastewater is of great environmental concern. Therefore, it is important to separate picric acid from wastewater streams. In this study, adsorption of picric acid was studied from aqueous solutions by using a weakly basic adsorbent (Amber lite IRA-67) at three different temperatures (298 K, 308 K, and 318 K). Adsorption of picric acid was investigated in terms of equilibrium, kinetics, and thermodynamic conditions. In the equilibrium studies, 1.00 g of Amber lite IRA-67 was determined as the optimal amount. The most used isotherms, Freundlich and Langmuir, were applied to the experimental data. The Langmuir isotherm gave good results with R squared values over 0.99 at different temperatures. In the kinetic studies, pseudofirst- and pseudosecond-order models and the Elovich equation were applied to the kinetic experiments. The pseudosecond-order model was fitted to this adsorption system with an R squared value of 0.996. In the thermodynamic studies, Delta H-ads(0) = -21.204 kJ.mol(-1), Delta S-ads(0) = -200.043 J.mol(-1).K-1, and Delta G(ads)(0) for different temperatures were calculated.
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    Comparison of Solid-Liquid Equilibrium Data for the Adsorption of Propionic Acid and Tartaric Acid from Aqueous Solution onto Amberlite IRA-67
    (Amer Chemical Soc, 2009) Uslu, Hasan; Inci, Ismail; Bayazit, Sahika Sena; Demir, Goeksel
    Investigation of adsorption parameters such as effect of initial acid concentration, effect of amount of adsorbent, effect of temperature,;, effect of contact time, fitting data to isotherms, and kinetic models for propionic acid and tartaric acid by using Amberlite IRA-67 adsorbent was studied. The maximum adsorption efficiencies were found to be 97.18% and 84.46% for tartaric acid and propionic acid, respectively. The best fitted isotherm was determined to be Langmuir for tartaric acid. The Langmuir isotherm was better fitted than the Frundlich isotherm for both acids. Elovich model equation was applied for data of each acids. The kinetics of the adsorption for both acids was determined as pseudo-second-order model.