Towards cleaner wastewater treatment for special removal of cationic organic dye pollutants: A case study on application of supramolecular inclusion technology with β-cyclodextrin derivatives. (20th May 2020)

• Record Type: Journal Article
• Authors: Duan, Zunbin; Li, Yanlin; Zhang, Mei; Bian, He; Wang, Yan; Zhu, Lijun; Xia, Daohong
• Is Part Of: Journal of cleaner production. Volume 256(2020)
• Publication Date: 2020-05-20
• Subjects: Supramolecular inclusion technology -- β-Cyclodextrin derivatives -- Cleaner wastewater treatment -- Special removal -- Cationic organic dye pollutants -- Case study; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.120308
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Organic dye pollutants in wastewater have always been one of the most serious environmental problems. Most of the chromogenic groups in organic dye, especially for cationic molecules, are nitrogenous groups, and their reduction is easy to form toxic amines. Realizing the special removal of these contaminants from wastewater is of great significance nowadays. β-Cyclodextrin (β-CD) as an environmentally friendly and inexpensive supramolecular host compound is usually used for selectively encapsulating various molecules through the supramolecular inclusion. Herein the supramolecular inclusion technology for the removal of cationic organic dye pollutants in wastewater was proposed using a novel water-insoluble β-CD derivative as a case study. Five alkoxydifluoro- p -phthalonitrile substituted β-CDs (Rx -β-CDs) were synthesized through the two-step aromatic nucleophilic substitution reaction. The structural characterizations indicate that these water-insoluble Rx -β-CDs are mono-substituted products with a small surface area of less than 10 m 2 g −1 . The removal performances of Rx -β-CD for cationic, anionic and electrically neutral organic dye pollutants were approached systematically. It was found that Rx -β-CD was highly efficient for removing the cationic pollutants. The removal of cationic methylene blue was very fast and could reach equilibrium of close to 100% within 1–3 min. The removal mechanism was confirmed that the special removal of cationic organic dye pollutants by Rx -β-CD is a supramolecular inclusion process. This study sets up a new method for selectively removing cationic organic contaminants from wastewater. Highlights: Supramolecular inclusion for wastewater treatment with relevant mechanism was set up. Special removal of cationic organic dye pollutants from water was realized. A novel green, safe and recyclable remover R4 -β-CD was designed and synthesized. MB removal of close to 100% was obtained within 1–3min. R4 -β-CD was about 30 times activated carbon in the MB removal rate.