Premium
Role of unburnt carbon in adsorption of dyes on fly ash
Author(s) -
Wang Shaobin,
Boyjoo Yashveersingh,
Choueib Ali,
Ng Esther,
Wu Hongwei,
Zhu Zhonghua
Publication year - 2005
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1299
Subject(s) - fly ash , adsorption , crystal violet , methylene blue , chemistry , langmuir adsorption model , carbon fibers , aqueous solution , langmuir , nuclear chemistry , organic chemistry , materials science , composite number , composite material , medicine , pathology , photocatalysis , catalysis
Abstract Various fly ash samples with different unburnt carbon contents were collected, characterised and tested for adsorption of basic dyes, Methylene Blue and Crystal Violet, in aqueous solution. It was found that unburnt carbon plays a major role in dye adsorption. The mineral matter of fly ash has little adsorption capacity and most of the adsorption capacity of fly ash can be attributed to the unburnt carbon. The fly ash with higher unburnt carbon content will have higher adsorption capacity. For the carbon‐free fly ash, adsorption capacities for Methylene Blue and Crystal Violet are only 2 × 10 −6 mol g −1 and 1.0 × 10 −6 mol g −1 , respectively, while the adsorption capacities for Methylene Blue and Crystal Violet on carbon‐enriched fly ash are 1.2 × 10 −4 mol g −1 and 1.0 × 10 −4 mol g −1 , respectively. A two‐site Langmuir adsorption model best describes the adsorption isotherm. Copyright © 2005 Society of Chemical Industry