Atık Kül Kullanılarak Methylene Blue ve Methyl Orange Adsorpsiyonu

Methylene blue ve Methyl orange’nin atık kül üzerine adsorpsiyonu kesikli bir sistem ile değerlendirilmiştir. Adsorpsiyon izotermleri, atık kül için maximum adsorpsiyon kapasitesini methylene blue ve methyl orange için sırasıyla 40.983 mg g-1 35.614 mg g-1 olarak göstermiştir. Dengedeki adsorpsiyon verilerinden Dubinin-Radushkevic (D-R) izoterm modeli de tanımlanmıştır. DubininRadushkevic (D-R) izoterm modelinden hesaplanan adsorpsiyon enerjisi Ea, oda sıcaklığında methylene blue ve methyl orange için sırasıyla 0.015 kJ mol-1 , 0.091 kJ mol-1 olarak hesaplanmıştır. Bu da atık kül üzerine (0.3 g) methylene blue ve methyl orange adsorpsiyonunun fiziksel adsorpsiyon olduğunu ifade etmektedir. Atık külün boya yüklü ve boya yüksüz görüntüleri SEM ile karakterize edilmiştir. Yeniden kullanılabilirlik çalışmaları da yapılmış ve 5 M HNO3 ile atık külün aktivitesini kaybetmediği ve yenilenebilir olduğu belirlenmiştir. Bu çalışma atık külün sulu çözeltilerden asidik ve bazik boyaların gideriminde etkili bir adsorban olduğunu önermektedir.

Adsorption of Methylene Blue and Methyl Orange By Using Waste Ash

The adsorption in a batch system for methylene blue (MB) and methyl orange (MO) on waste ash were evaluated. The adsorption isotherms showed adsorptive maximum capacities for waste ash of MB and MO 40.983 mg g-1 35.614 mg g-1 respectively. The equilibrium adsorption data were fitted by DubininRadushkevic (D-R) adsorption isotherm model. The estimated values of adsorption energy, Ea, calculated from the D-R isotherm, for both MB and MO and waste ash systems were found to be 0.015 kJ mol-1 , 0.091 kJ mol-1 at room temperature respectively which implies that adsorption of both MB and MO on waste ash (0.3 g) is by physical adsorption. Waste ash and the dyes loaded waste ash were characterized by SEM. We studied reusability and it was found that the waste ash is stable and regenerable by 5 M HNO3 without losing their activity. This research suggests that the waste ash can be an effective adsorbent for the removal of such acidic and basic dyes from aquatic solution.

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