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۱Comparison studies of Adsorption Properties on Basic Blue 9 Removal by Tea Waste and NaOH– modified Tea Waste
اطلاعات انتشار: پانزدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۴
The use of tea waste (TW) and NaOH–modified tea waste (NMTW) for the removal of basic blue 9 (BB9) from aqueous solutions was studided in details. The equilibrium data were analyzed by Langmuir, Freundlich, Temkin and Redlich–Peterson isotherm models and pseudo–first order and pseudo–second order kinetic models. The experimental results demonstrated that BB9 can be effectively removed from aqueous solution by both the adsorbent and the adsorption capacity of the NMTW was found to be greater than the TW. Various thermodynamic parameters, such as ΔG°, ΔH°, ΔS° and Ea, have been calculated. The findings of this investigation suggested that physical sorption plays a role in controlling the sorption rate.<\div>

۲Study of Biosorption Parameters: Isotherm and Kinetics of Methyl Orange Adsorption onto Modified–Wheat Straw
اطلاعات انتشار: دومین کنفرانس بین المللی و سومین همایش ملی کاربرد فناوری های نوین در علوم مهندسی، سال
تعداد صفحات: ۵
In this work, the wheat straw (WS) materials have been simply modified by aminopropyltriethoxysilane (APTES). The adsorption of methyl orange (MO) from aqueous solutions onto modified wheat straw has been studied. The adsorption isotherm data were fitted to Langmuir and Frundlich equations, and the Langmuir adsorption capacity, Qmax was found to be 126.5 mgg−1. It was found that the adsorption of MO decreases by increasing temperature from 303 to 323K and the process is exothermic in nature. The removal of MO by APTES –WS followed pseudo–second order reaction kinetics based on Lagergren equations.<\div>

۳Study of Isotherm and Kinetics Parameters for Methylene blue Adsorption onto Wheat Straw
اطلاعات انتشار: دومین کنفرانس بین المللی و سومین همایش ملی کاربرد فناوری های نوین در علوم مهندسی، سال
تعداد صفحات: ۵
In this work, the wheat straw (WS) was used as an adsorbent. The adsorption of methylene blue (MB) from aqueous solutions onto WS has been studied. Four widely isotherms, Langmuir, Freundlich, Temkin and Sips were examined for MB sorption at different temperatures. The Langmuir isotherm found to be the best to describe sorption of MB on WS. The Langmuir adsorption capacity(Qmax) was found to be 172241 mg g−1. The Sips and Temkin isotherms were also satisfactory but the Freundlich isotherm couldn’t describe sorption appropriately in this case. The removal of MB by WS followed pseudo–second order reaction kinetics.<\div>
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