Kurumun Atıf Alan Makalesi
Atıf Alan Yayın
Use of β-cyclodextrin and starch based polymers for sorption of Congo red from aqueous solutions
Scopus
Toplam 124 atıf DOI
Two starch-based and a β-cyclodextrin (β-CD)-based polymers were synthesized using 4,4′-methylene-bis-phenyldiisocyanate (MDI) or hexamethylenediisocyanate (HMDI) as a cross linking agent in dry dimethylformamide and used as a sorbent for the removal of Congo red from aqueous solutions. The cross-linked polymers were characterized by Fourier transform infrared spectroscopy, thermogravimetric and differential scanning calorimetric analysis. The dye adsorption experiments were carried out by using batch and recycling column procedure. The effects of initial pH (pH0), the contact time and the initial dye concentration were changed to obtain the best experimental conditions. The pH0 of the dye solution strongly affected the chemistry of both the dye molecules and polymer 3 in an aqueous solution. The effective pH0 was 7.0 for adsorption on polymer 3. The equilibrium adsorption data were interpreted using Langmuir and Freundlich models. The adsorption of Congo red was better represented by the Freundlich equation. © 2007 Elsevier B.V. All rights reserved.
Atıf Kaynağı
Atıf Yapan Yayın
Removal of carcinogenic direct azo dyes from aqueous solutions using calix[n]arene derivatives
Scopus
Havuzumuzda 48 atıf almış
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]jarenes 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. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Atıf Yapan Makale Bilgileri
Kurumlar (2)
Selçuk Üniversitesi
Selçuklu, Turkey
Technische Universität Braunschweig
Braunschweig, Germany