title: New amphoteric flocculant containing beta-cyclodextrin, synthesis, characterization and decolorization properties.
abstract: 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.
authors.affiliation: School of Textiles & Clothing, Key Laboratory of Eco-Textile, Ministry of Education, Jiangnan University, Wuxi 214122, PR China. drjiangxue@yahoo.com
authors.forename: Xue
authors.initials: X
authors.lastname: Jiang
authors.forename: Yuanjing
authors.initials: Y
authors.lastname: Qi
authors.forename: Shugen
authors.initials: S
authors.lastname: Wang
authors.forename: Xiuzhi
authors.initials: X
authors.lastname: Tian
mesh_terms: D000645:Ammonium Sulfate / Q000737:chemistry; D003116:Color; D004396:Coloring Agents / Q000032:analysis*; D004563:Electrochemistry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D009682:Magnetic Resonance Spectroscopy; D008768:Methylmethacrylates; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D011720:Pyrazoles / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013447:Sulfites / Q000737:chemistry; D013696:Temperature; D014783:Viscosity; D014865:Waste Disposal, Fluid / Q000379:methods; D047392:beta-Cyclodextrins / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D008768:Methylmethacrylates; D011720:Pyrazoles; D013447:Sulfites; C110485:TMAEMC-methyl methacrylate copolymer; D047392:beta-Cyclodextrins; C031276:ammonium peroxydisulfate; C010377:yellow 2G; D000645:Ammonium Sulfate; C009279:sodium bisulfite