Removal of carcinogenic direct azo dyes from aqueous solutions using calix[n]arene derivatives
Küçük Resim Yok
Tarih
2007
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
WILEY
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Calix[n]arenes having different internal cavities sizes were synthesized. The ability of these sorbents to extract carcinogenic direct azo dyes from water by a solid-liquid extraction process was studied and compared to results obtained with the unsubstituted calix[n]arene. The carboxylic acid derivative of calix[6,8]arene showed the highest affinity towards the azo dyes. The sorption capacity of dyes on the calix[n]arenes was dependent on the presence of sulfonate groups on the anionic dyes. The optimum pH value for dye sorption was observed at pH 3.5 to 8.5 for all calixarene derivatives. The proposed sorption mechanism involves several kinds of interactions: electrostatic repulsion between carboxylic acid groups of calix[n]arenes and sulfonate groups of azo dyes, hydrogen bonding and formation of an inclusion complex through host-guest interactions.
Açıklama
Anahtar Kelimeler
calix(n)arenes, carcinogens, direct azo dye, sorption, solid-liquid phase
Kaynak
CLEAN-SOIL AIR WATER
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
35
Sayı
6
