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    Kinetic and Thermodynamics of Remazol Brilliant Blue R Adsorption
    (Asian Journal Of Chemistry, 2013) Bayrak, Yuksel; Uzgor, Resmiye
    Orange peel, an agricultural solid waste abundantly available in Turkey, was utilized as a precursor for preparation of activated carbon via sulphuric acid chemical activation. The orange peel activated carbon (OPAC) is used for the removal of remazol brilliant blue R from aqueous solution. Research concerning the effects of pH, adsorbent dose, initial dye concentration and temperature are presented and discussed. Kinetic and thermodynamic parameters of adsorption were calculated.
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    Removal of Reactive Dye from Aqueous Solution by Activated Carbon
    (Asian Journal Of Chemistry, 2013) Bayrak, Yuksel; Uzgor, Resmiye
    This study investigates the potential use of activated carbon prepared from orange peel for the removal of remazol brilliant blue R (RBBR) dye from aqueous solution. The effects of different system variables, solution pH (from 4 to 10), solution temperature (from 25 to 55 degrees C), adsorbent dose (from 0.1 to 1 g) and contact time (from 15 to 75 min) were studied. The maximum dye removal was reached at 75 min. The results showed that as the amount of the adsorbent increased, the percentage of dye removal increased accordingly. Sorption isotherms were analyzed by Langmuir, Freundlich, Redlich-Peterson, Tempkin and Dubinin-Radushkevich models at different temperatures of 25, 35, 45 and 55 degrees C. The maximum adsorption capacity obtained from Langmuir equation was 26.15 mg g(-1). Furthermore, adsorption kinetics of remazol brilliant blue R were studied and the rate of adsorption was found to conform to pseudo-second-order kinetics with a good correlation (R-2 > 0.85) with intraparticle diffusion as one of the rate determining steps. The results of this study showed that activated carbon developed from orange peel could be employed as effective and low-cost materials for the removal of dyes from aqueous solution.
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    Removal of Remazol Black B Textile Dye from Aqueous Solution by Adsorption: Equilibrium and Thermodynamic Studies
    (Taylor & Francis Inc, 2013) Bayrak, Yuksel; Uzgor, Resmiye
    The use of low-cost, easy obtained, high-efficiency, and eco-friendly adsorbents has been investigated as an ideal alternative to the current expensive methods of removing dyes from aqueous solution. This study investigates the potential use of activated carbon prepared from orange peel for the removal of Remazol Black B (RB) dye from aqueous solution. It was seen that the removal of RB increased with increasing solution pH (4-10), solution temperature (25-55 degrees C) and adsorbent dose (0.1-1g/20mL). The maximum dye removal was reached at 90 minutes. Adsorption isotherms were analyzed by Langmuir and Freundlich models at different temperatures of 25 degrees C, 35 degrees C, 45 degrees C, and 55 degrees C, and the results were discussed in detail. Moreover, the thermodynamics of adsorption were also studied. It was found that the values of standard free energy (G degrees) were negative for activated carbon. The values of standard enthalpy (H degrees) and entropy (S degrees) were found to be positive, and the obtained results were interpreted in detail. Activated carbon developed from orange peel can be attractive options for dye removal from diluted industrial effluents since test reaction made on simulated dyeing aqueous solution show better removal percentage of RB.