NDLI: Optimization of the Conditions for the Cr (III) Adsorption on Activated Carbon

Content Provider	Springer Nature Link
Author	Lyubchik, Svetlana B. Perepichka, Irene I. Galushko, Olga L. Lyubchik, Andrey I. Lygina, Elena S. Fonseca, Isabel M.
Copyright Year	2005
Abstract	In order to understand the patterns of the adsorption equilibrium of Cr (III) on activated carbon, the adsorption process was studied by two different ways: classical batch experiments on commercial Norit and Merck activated carbons and their oxidized forms in a wide range of pHs; and extended time-based tests at the same pH values on the same adsorbents. This approach allowed us to understand the role of texture, chemical carbon surface functionality and experimental conditions (initial pH of the solution, contact time and adsorbate/adsorbent ratio) on the effectiveness of Cr (III) removal. The adsorption process of Cr (III) at (24 ± 1∘C) on Merck and Norit activated carbons and their oxidized forms were studied at pH values between 1.5 and 5 (either adjusted or buffered). Chromium concentration was fixed at 200 ppm. The carbon loading ranged from 1.2 to 20 g/l. The carbon/Cr (III) solution contact time was varied from 0.5–1 month to 5 months, to ensure that the saturation of the carbon level was reached. According to the data obtained, the presence of carboxylic groups on carbon surface seems to enhance Cr (III) uptake at initial pH of the solution in the range between 2 and 4. Depending on the nature of the adsorbent surface chemistry, the contact time to reach equilibrium may range from 3 to 5 months. There is an optimum carbon loading which limits the Cr (III) uptake/removal at given pH value. In order to understand the adsorption process, an ion exchange, surface complex and surface precipitation were considered.
Starting Page	581
Ending Page	593
Page Count	13
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	11
Issue Number	5-6
e-ISSN	15728757
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	heavy metals adsorption activated carbon surface chemistry Industrial Chemistry/Chemical Engineering Engineering Thermodynamics, Transport Phenomena Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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