TY - JOUR
T1 - Thermo-XRD-analysis and peptization study of the adsorption of alizarinate by Co-, Ni-, and Cu-montmorillonite
AU - Epstein, Malka
AU - Lapides, Isaak
AU - Yariv, Shmuel
PY - 2005/3
Y1 - 2005/3
N2 - The adsorption of the monovalent anionic dye alizarinate onto Co-, Ni- and Cu-montmorillonite was carried out by adding the dye into aqueous clay suspensions. During the loading of the clay suspension by alizarinate, only some of the added organic anion is adsorbed by the clay forming d-coordination chelate complexes on the clay surface. Maximum adsorption of Co-, Ni- and Cu-clay were 13, 13 and 25 mmol dye per 100 g clay. Since the capacity of the clay for these transition metal cations is 38 mmol per 100 g clay, these saturations indicate that only part of the transition metal cations form positively charged d-coordination chelate complexes with metal:ligand ratio of 1. The complex cations can be located inside the interlayer spaces or on the broken bonds surfaces. Thermo-XRD-analysis and peptization studies of the solids and the clay water systems respectively were used here to identify the sorption sites. The Co and Ni complexes were obtained on the broken bonds surfaces whereas the Cu complexes were obtained in the interlayer space. Co2+, Ni2+ and Cu2+ were extracted from the clay into suspensions containing excess alizarinate.
AB - The adsorption of the monovalent anionic dye alizarinate onto Co-, Ni- and Cu-montmorillonite was carried out by adding the dye into aqueous clay suspensions. During the loading of the clay suspension by alizarinate, only some of the added organic anion is adsorbed by the clay forming d-coordination chelate complexes on the clay surface. Maximum adsorption of Co-, Ni- and Cu-clay were 13, 13 and 25 mmol dye per 100 g clay. Since the capacity of the clay for these transition metal cations is 38 mmol per 100 g clay, these saturations indicate that only part of the transition metal cations form positively charged d-coordination chelate complexes with metal:ligand ratio of 1. The complex cations can be located inside the interlayer spaces or on the broken bonds surfaces. Thermo-XRD-analysis and peptization studies of the solids and the clay water systems respectively were used here to identify the sorption sites. The Co and Ni complexes were obtained on the broken bonds surfaces whereas the Cu complexes were obtained in the interlayer space. Co2+, Ni2+ and Cu2+ were extracted from the clay into suspensions containing excess alizarinate.
KW - Alizarinate adsorption
KW - Co-alizarinate complex
KW - Cu-alizarinate complex
KW - Montmorillonite
KW - Ni-alizarinate complex
KW - Peptization
KW - Thermo-XRD-analysis
UR - http://www.scopus.com/inward/record.url?scp=15044364108&partnerID=8YFLogxK
U2 - 10.1007/s00396-004-1184-2
DO - 10.1007/s00396-004-1184-2
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AN - SCOPUS:15044364108
SN - 0303-402X
VL - 283
SP - 604
EP - 611
JO - Colloid and Polymer Science
JF - Colloid and Polymer Science
IS - 6
ER -