Adsorption Characterization of Cd by Coal Fly Ash Using Response Surface Methodology (RSM)

Title
Adsorption Characterization of Cd by Coal Fly Ash Using Response Surface Methodology (RSM)
Authors
안상우최재영차민환박재우
Keywords
Adsorption; Cadmium; Coal fly ash; Heavy metal; Response surface methodology; 흡착; 카드뮴; 반응표면분석법; 석탄회; 중금속
Issue Date
2010-01
Publisher
한국지반환경공학회 논문집
Citation
VOL 11, NO 1, 19-26
Abstract
The batch experiments and response surface methodology (RSM) have been applied to the investigation of the cadmium (Cd) adsorption by coal fly ash (CFA). CFA having maximum Cd removal mass of 8.51 mg/g were calculated from Langmuir model. Cd removal reaction with different initial pH ranged from 4 to 9. When the initial pH was higher, Cd was removed more by adsorption and precipitation. These results suggest that the lower pH cause an increase of H+ ion concentration which competed with Cd ions for exchange sites in CFA. Also, The Cd adsorption was mathematically described as a function of parameters initial Cd concentration (X1), initial pH (X2), and initial CFA mass (X3) being modeled by use of the Box-Behnken methods. Empirical models were developed to describe relationship between the experimental variables and response. Statistical analysis indicates that tree factors (X1, X2, and X3) on the linear term (main effects), and tree factors (X1X2, X1X3, and X2X3) on the non-linear term (Interaction effect; cross-product) had significant effects, respectively. In this case, the value of the adjusted determination coefficient (adjusted R2=0.9280) was closed to 1, showing a high significance of the model. Statistical results showed the order of Cd removal at experimental factors to be initial initial pH > initial Cd concentration > initial CFA mass.
URI
http://pubs.kist.re.kr/handle/201004/37223
ISSN
1598-0820
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KIST Publication > Article
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