Synthesis and application of calix[4]arene based resin for the removal of azo dyes
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- 作者：Muhammad Afzal Kamboh ; Imam Bakhsh Solangi ; S.T.H. Sherazi ; Shahabuddin Memon
- 关键词：Calixarene ; Immobilization ; Amberlite resin ; Azo dye ; Solid-phase extraction ; Batch-wise sorption
- 刊名：Journal of Hazardous Materials
- 出版年：2009
- 出版时间：15 December 2009
- 年：2009
- 卷：172
- 期：1
- 页码：234-239
- 全文大小：791 K
文摘
The present study describes a novel synthetic method for the immobilization of calix[4]arene (II) onto the surface of modified Amberlite XAD-4 resin (4), which does not require the derivatization of calixarene moiety. The novel calix[4]arene based resin (C4 resin) 5 was used as sorbent for the removal of azo dyes. Batch-wise sorption study was carried out and observed that the C4 resin (5) is more effective as compared to compound II as well as pure Amberlite XAD-4 resin (1) to remove the selected dyes [i.e. Reactive Black-5 (RB-5), Reactive Red-45 (RR-45) and Congo Red (CR)]. The effect of sorbent dosage and pH on % sorption was studied. During the extraction process, various kinds of interactions such as electrostatic repulsion, deprotonation of the hydroxyl groups of C4 resin, dissociation of reactive dyes into anions/cations and structural variations were monitored and found that they are highly pH dependent.