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۱Adsorption isotherm studies of acid dye removal by exfoliated graphite
نویسنده(ها): ،
اطلاعات انتشار: اولین کنفرانس بین المللی تصفیه فاضلاب و بازیافت آب، فناوری ها و یافته های نو، سال
تعداد صفحات: ۶
The unaesthetic look of dyes and their toxicological effects have drawn considerable attention toward the contamination caused by textile effluents. Public opinion is extremely sensitive to this kind of environmental impact and often becomes more intolerant with the type of colored wastewaters than with much more dangerous ones that do not seem as harmful as they are colorless. Adsorption has been shown to be the most promising option for the removal of nondegradable dyes from aqueous streams. Exfoliated graphite (EG) is a well known material usually produced from various intercalation compounds submitted to a thermal shock. The development and the operation of dye adsorption processes require knowledge of the adsorption isotherms. In this work the use of exfoliated graphite has been investigated as an adsorbent for removal of C.I Acid Blue 92. The effect of initial dye concentration on removal efficiency was studied and adsorption capacity of exfoliated graphite was determined through a series of batch tests. The adsorption equilibrium data were analysed and the parameters of various isotherm models such as Langmuir, Freundlich and Radke–Prausnitz were estimated using experimental data. The results have shown that adsorption behaviour of the dye could be described reasonably by Radke–Prausnitz model as well as that of Langmuir.<\div>

۲Mathematical modelling of dye removal from aqueous solution in a fixed bed column using exfoliated graphite as adsorbent
نویسنده(ها): ،
اطلاعات انتشار: اولین کنفرانس بین المللی تصفیه فاضلاب و بازیافت آب، فناوری ها و یافته های نو، سال
تعداد صفحات: ۵
Colored dye effluents pose a major threat to surrounding ecosystem and many of them are extremely toxic. Adsorption process in fixed bed columns has been widely used in industrial processes for dye removal from textile effluents. Mathematical modeling of the process can be very useful to evaluate the efficiency of the process as well as optimizing design and operational parameters. In this work the use of exfoliated graphite has been investigated as an adsorbent for removal of C.I Acid Blue 92. First the equilibrium behavior was obtained through a series of batch tests at constant temperature and experimental data were fitted to various isotherm models. The results have shown that adsorption behavior of the dye could be described reasonably by Radke–Prausnitz model as well as that of Langmuir. Then a linear driving force for the rate of adsorption and an axial dispersion model for dynamic behavior of fixed bed adsorber with nonlinear adsorption isotherm were formulated and solved numerically. Finally the mathematical model was validated through a comprehensive experimental study on the breakthrough curves of the C.I Acid Blue 92 adsorption over wormlike exfoliated graphite in a laboratory size column.<\div>
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