CATIONIC DYE COAGULATION BY NATURAL POLYPHENOLS FOR POTENTIAL APPLICATION IN WATER TREATMENT
In this study, we employed ethanolic grape seed extract (GSE) and grape seed-derived polyphenols such as tannic acid and catechin in an effort to find novel NOCs showing stable anionic forms for removal of cationic organic pollutants. The target substances tested were malachite green (MG) and crystal violet (CV) belonging to mutagenic cationic dyes. Polyphenol treatment induced fast decolorization followed by gradual floc formation concomitant with red or blue shifts in maximum absorbance wavelengths of cationic dyes. Liquid chromatography analysis of flocs formed by polyphenols directly showed that initial supramolecular complexes attributed mainly to electrostatic attraction between polyphenol hydroxyphenyl groups and cationic dyes further progressed into stronger aggregates, leading to precipitation of dye-polyphenol complexes. Consistent with the results obtained using catechin and tannic acid, use of GSE also resulted in effective decolorization and coagulation of soluble MG and CV in aqueous solutions. Screening of several organic GSE components for NOC activity strongly suggested that natural polyphenols are the main organic ingredients causing MG and CV removal via gradual floc formation. The treatment by natural polyphenols and GSE decreased toxicity of MG or CV-contaminated water.
Jeon J-R Kim E-J Kim Y-M Kumarasamy M Chang Y-S
School of Environmental Science and Engineering,Pohang University of Science and Technology (POSTECH),Pohang,790-784,Korea
国际会议
北京
英文
1-3
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）