التفاصيل البيبلوغرافية
| العنوان: |
EQUILIBRIUM AND KINETIC STUDY ON HEXAVALENT CHROMIUM SORPTION ON BENTONITE SUPPORTED ZERO VALENT IRON. |
| المؤلفون: |
Arildii, Dashjargal, Davaasambuu, Sarangerel, Batchuluun, Sukhbaatar |
| المصدر: |
Journal of Chemical Technology & Metallurgy; 2018, Vol. 53 Issue 2, p218-231, 14p |
| مصطلحات موضوعية: |
HEXAVALENT chromium, CHEMICAL kinetics, EQUILIBRIUM reactions, SORPTION, BENTONITE |
| مستخلص: |
The potential application of bentonite supported zero valent iron as a sorbent is evaluated in this study. It overcomes the disadvantages of the zero valent iron referring to its tendency of easy agglomeration and oxidation. The removal efficiency in respect to chromium (VI) species and the corresponding sorption mechanism is investigated. The maximum removal efficiency amounts to 99.85 % at an optimal solution pH of 4.5, an initial concentration of 50 mg L-1 and a sorbent dosage of 0.3 g at an ambient temperature. It is shown that bentonite supported zero valent iron can be successfully used to remove chromium (VI) ions from aqueous media. Freundlich and Langmuir sorption isotherm models are applied. The latter provides better description showing that chemisorption of chromium (VI) species proceeds leading to a uniform monolayer formation. According to the mechanism advanced a mixed hydroxide containing chromium (III) and iron (III) ions is formed on the bentonite supported zero valent iron surface. This is in an accord with the obtained pseudo second order kinetics model. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
