TY - JOUR
T1 - Visible absorption spectroscopy study of the adsorption of Congo Red by montmorillonite
AU - Yermiyahu, Z.
AU - Lapides, I.
AU - Yariv, S.
PY - 2003/12
Y1 - 2003/12
N2 - The adsorption of the anionic dye Congo Red (CR) by Na-, Cs-, Mg-, Cu-, Al- and Fe-montmorillonite was investigated by electronic spectroscopy. Spectra of the aqueous suspensions of different clay concentrations and, different loadings were recorded. The spectra were curve fitted and were compared to spectra of aqueous solutions of CR at different pH values. Four bands representing anionic varieties and two representing protonated varieties of CR were identified in spectra of CR-treated Na-, Cs-, Mg, Cu- and Al-montmorillonite. Spectra of CR-treate Femontmorillonite were slightly different, showing three bands representing anionic varieties and four representing protonated CR. The ratio between areas of bands, which represent the protonated varieties, and those representing the anionic varieties were determined showing correlation with the acidity of the metallic cation. The clay in the aqueous suspensions became coloured after the adsorption of CR. The following stainings were obtained, Na- and Mg-clay, red, Cs-clay, violet-red, Cu-clay, reddish-violet, Al-clay, dark violet and Fe-clay, dark blue. It appears that CR can serve as an indicator of the surface acidity of montmorillonile, The effects of aging on the sorption of the dye and on the surface-acidity of the CR-clay complex were investigated.
AB - The adsorption of the anionic dye Congo Red (CR) by Na-, Cs-, Mg-, Cu-, Al- and Fe-montmorillonite was investigated by electronic spectroscopy. Spectra of the aqueous suspensions of different clay concentrations and, different loadings were recorded. The spectra were curve fitted and were compared to spectra of aqueous solutions of CR at different pH values. Four bands representing anionic varieties and two representing protonated varieties of CR were identified in spectra of CR-treated Na-, Cs-, Mg, Cu- and Al-montmorillonite. Spectra of CR-treate Femontmorillonite were slightly different, showing three bands representing anionic varieties and four representing protonated CR. The ratio between areas of bands, which represent the protonated varieties, and those representing the anionic varieties were determined showing correlation with the acidity of the metallic cation. The clay in the aqueous suspensions became coloured after the adsorption of CR. The following stainings were obtained, Na- and Mg-clay, red, Cs-clay, violet-red, Cu-clay, reddish-violet, Al-clay, dark violet and Fe-clay, dark blue. It appears that CR can serve as an indicator of the surface acidity of montmorillonile, The effects of aging on the sorption of the dye and on the surface-acidity of the CR-clay complex were investigated.
KW - Anionic dye adsorption
KW - Congo Red
KW - Montmorillonite
KW - Organo-clay complex
KW - Visible spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=1642457199&partnerID=8YFLogxK
U2 - 10.1180/0009855033840110
DO - 10.1180/0009855033840110
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:1642457199
SN - 0009-8558
VL - 38
SP - 483
EP - 500
JO - Clay Minerals
JF - Clay Minerals
IS - 4
ER -