Özet Bu çalışmada Reaktif Black 5 (RB5) boyar maddesinin granül aktif karbon (GAK) üzerine kesikli deneyler ile adsorpsiyonu çalışılmıştır. Adsorpsiyon sürecini açıklayabilmek için iki ve ikiden fazla parametreli olmak üzere toplam 17 farklı izoterm modeli kullanılmıştır. İki parametreli modeller arasında 0,99"dan büyük regresyon katsayıları, heterojen yüzey adsorpsiyon süreçlerinin tanımlanmasında kullanılan Freundlich, Halsey ve Henderson izotermlerinden elde edilmiştir. Tüm adsorpsiyon izotermleri arasında en yüksek regresyon katsayısı (0,998) Fritz-Schlunder modelinden hesaplanmıştır. Langmuir izotermi GAK"ın maksimum adsorpsiyon kapasitesini 23,58 mg/g olarak tahmin etmiştir. Adsorpsiyon kinetiğini en iyi açıklayan modelin yalancı ikinci derece kinetik eşitliği olduğu bulunmuştur. Adsorpsiyon kinetiği üzerine GAK dozunun etkili olduğu tespit edilmiştir. Abstract In this study the adsorption of Reactive Black 5 (RB5) dye onto granulated activated carbon (GAC) has been studied in batch experiments. 17 different adsorption isotherms which have two and more than two parameters have been used to explain the adsorption process. Greater than 0.99 regression coefficients were obtained from Freundlich, Halsey and Henderson isotherms, defining adsorption of heterogeneous surfaces, among two parameters models. The highest regression coefficient (0,998) was obtained from four parameters Fritz-Schlunder model among all adsorption isotherms. Langmuir isotherm predicted 23.58 mg/g maximum adsorption of GAC. The model that best describes the adsorption kinetics was found as the pseudo second order model. It was determined that GAC dosage was effective on adsorption kinetic.
Abstract-The modification of adsorbent with a cationic surfactant is an effective and inexpensive method to enhance sorption capability of adsorbent. In this study, raw corn straw, modified with a cationic surfactant, tetradecyltrimethyl ammonium bromide was used as adsorbent for dye removal from aqueous solution. The modification caused surface properties of the adsorbent altered from hydrophilic to hydrophobic. To comprehend the modification, the physical property of adsorbents was characterized by BET surface analysis, FTIR-spectra and SEM images. The adsorption of two organic dyes namely blue21 and yellow20 on the modified adsorbent has been investigated in three batch adsorption experiments. Firstly, kinetic study was performed. It was found that the equilibrium time was at 180 min and the kinetic data obeyed pseudo-second order kinetic model. Secondly, the effect of the pH solution was investigated. It was found that the adsorption capacity decreased at a low level with increase in the solution pH. Finally, the adsorption isotherms experiment was conducted and the equilibrium adsorption data was fitted into Langmuir and Freudlich isotherms and the system followed only the Freulich equation. From the above result, the corn straw modified by cationic surfactant is an effective adsorbent for removal of the organic dyes from aqueous solution.
Abstract.The adsolubilisation of tetradecyltrimethyl ammonium bromide byan adsorbent termed 'organorice straw' was developed in this research to enhance the decolorization behavior of yellow20 in aqueous solutions. The organo-rice straw was characterized by elemental analysis, Brunauer-Emmett-Teller (BET) method, Fourier transform infrared spectroscopy (FTIR) technique, and scanning electron microscopy (SEM) images. Batch studies were researched to address various experimental parameters such as contact time, the initial pH solution, and initial dye concentration. Results showed that the major contents of yellow20 and organo-rice straw were carbon and hydrogen indicating their hydrophobic natures. The percentage of yellow20 that was removed bythe organo-rice straw was 96.01%, higher than the 36.44% removed by the precursor. The equilibrium adsorption was reached within 3.0 h and the amount of yellow20 adsorbed was independent of the pH0. The kinetic data were fitted to pseudo-first order, pseudosecond order, and intra-particle diffusion models. Results implied that adsorption of yellow20 by this adsorbent followed the second order kinetic model and the maximum adsorption capacity was found to be 166.55 mg.g -1 . Equilibrium isotherms were analyzed by the Langmuir, Freundlich, Temkin, and DubininRadushkevtch isotherms. The Freundlich isotherm described the isotherm data with high-correlation coefficients. The results of the study indicate that organo-rice straw is a potential and active bio-sorbent for the removal of yellow20.
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