Decolorization Performance of a Methyl Benzyl Diallyl Quaternary Ammonium Salt Copolymer in a Simulated Reactive Dyeing Wastewater

Abstract

The source of dyeing wastewater and the composition of pollutants are very complex, direct discharge will bring great harm to living environment, and cause waste of water resources. For the treatment of reactive dyeing wastewater, this work developed and synthesized a novel cationic flocculant called Poly (DMDAAC-co-DAMBAC), which was made by copolymerizing dimethyl-diallyl-ammonium chloride (DMDAAC) and methyl-benzyl-diallyl-ammonium chloride (DAMBAC). To assess its flocculation effects, flocculation decolorization studies with 3RF reactive yellow, KN−R reactive blue, and 3BF reactive red were conducted. The copolymers′ lipophilicity considerably increased once atyl groups were added. The experimental results showed that Poly(DMDAAC-co-DAMBAC) had an optimal decolorization rate of over 94 % for three reactive dyes and a maximum decolorization rate of roughly 80 % for CODMn, both of which were significantly higher than those of PDMDAAC and nearly on par with those of PDAMBAC with a comparable viscosity. Instead, Theoretical calculations of the binding energy of the results demonstrated the accuracy of the findings. The study illustrated the flocculation mechanism and laid the foundation for further application of Poly(DMDAAC-co-DAMBAC).