New amphoteric flocculant containing beta-cyclodextrin, synthesis, characterization and decolorization properties

• Published in: Journal of hazardous materials Vol. 173; no. 1-3; pp. 298 - 304
• Main Authors: Jiang, Xue, Qi, Yuanjing, Wang, Shugen, Tian, Xiuzhi
• Format: Journal Article
• Language: English
• Published: Netherlands 15.01.2010
• Subjects: Ammonium Sulfate - chemistry; beta-Cyclodextrins - chemical synthesis; beta-Cyclodextrins - chemistry; Color; Coloring Agents - analysis; Electrochemistry; Hydrogen-Ion Concentration; Industrial Waste; Magnetic Resonance Spectroscopy; Methylmethacrylates; Microscopy, Electron, Scanning; Oxidation-Reduction; Pyrazoles - chemistry; Spectroscopy, Fourier Transform Infrared; Sulfites - chemistry; Temperature; Viscosity; Waste Disposal, Fluid - methods
• ISSN: 1873-3336
• DOI: 10.1016/j.jhazmat.2009.08.083

To react with the cationic monomer, N-trimethylaminoethylmethacrylate chloride (TMAEMC), a beta-CD derivative carrying vinyl carboxylic acid groups (beta-CD-MAH) was designed and synthesized via esterfying reaction between beta-CD and maleic anhydride (MAH). Whereafter, a water-soluble amphoteric flocculant, the copolymer of TMAEMC and beta-CD-MAH (beta-CD-MAH-TMAEMC) has been synthesized by means of free radical copolymerization using the ammonium persulfate (APS) and sodium bisulfite (SBS) redox system as the initiator. The copolymer structure was demonstrated by FT-IR, (1)H NMR, SEM characterizations. Its excellent flocculated decolorization properties were evaluated with Acid Light Yellow 2G solutions using a jar test method. With the mass ratio of 1/10 (w/w) between the flocculant and dye, and at pH 4 and 20 degrees C of the initial dye solution, the maximum color removal reached. The charge neutralization played a dominant role during the flocculated decolorization process, although the inclusion of dye molecules into the cavities of beta-CD well maintained in side chain of beta-CD-MAH-TMAEMC also contributed to the conglomerates and floccules.