TY - JOUR
T1 - Metachromasy in clay-mineral systems
T2 - Adsorption of cationic dyes crystal violet and ethyl violet by kaolinite from aqueous and organic solutions
AU - Yariv, Shmuel
AU - Ghosh, Dipak K.
AU - Hepler, Loren G.
PY - 1991
Y1 - 1991
N2 - Adsorption of two cationic dyes, crystal violet (CV) and ethyl violet (EV), by kaolinite has been investigated by normal and comparative electronic spectroscopy. It was found that adsorption of both dyes from dilute aqueous solutions resulted in metachromasy. Adsorption from organic solvents (isopropyl alcohol or glycerol) led to metachromasy with CV but not with EV. Adsorption from mixed water-organic solvents was dependent on both the cationic dye used and the composition of the solvent. Quantitative determinations showed that both dyes were adsorbed to a greater extent from aqueous solutions than from isopropyl alcohol or aqueous isopropyl alcohol solutions, with more CV than EV being adsorbed.
AB - Adsorption of two cationic dyes, crystal violet (CV) and ethyl violet (EV), by kaolinite has been investigated by normal and comparative electronic spectroscopy. It was found that adsorption of both dyes from dilute aqueous solutions resulted in metachromasy. Adsorption from organic solvents (isopropyl alcohol or glycerol) led to metachromasy with CV but not with EV. Adsorption from mixed water-organic solvents was dependent on both the cationic dye used and the composition of the solvent. Quantitative determinations showed that both dyes were adsorbed to a greater extent from aqueous solutions than from isopropyl alcohol or aqueous isopropyl alcohol solutions, with more CV than EV being adsorbed.
UR - http://www.scopus.com/inward/record.url?scp=0001138415&partnerID=8YFLogxK
U2 - 10.1039/FT9918701201
DO - 10.1039/FT9918701201
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:0001138415
SN - 0956-5000
VL - 87
SP - 1201
EP - 1207
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 8
ER -