Abstract
A water soluble branched cationic polyacrylamide (BCPAM) was synthesized using solution polymerization. The polymerization was initiated using potassium diperiodatocuprate, K5[Cu(HIO6)2](Cu(III)), initiating the self-condensing vinyl copolymerization of acrylamide and acryloxyethyltrimethyl ammonium chloride (DAC) monomer. The resulting copolymer was characterized by the use of Fourier-transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR) spectroscopy. Its flocculation properties were evaluated with standard jar tests of sewage. The effects of initiator concentration, monomer concentration, reaction temperature, and the mass ratio of monomers on intrinsic viscosity and flocculation properties of the product were determined using single-factor experiments and orthogonal experiment.
Highlights
The process of coagulation and flocculation is one of the physicochemical unit processes in water and wastewater treatment [1, 2]
We previously reported the synthesis of a branched nonionic polyacrylamide (BNPAM) [15]
The reaction mechanism of preparation of branched cationic polyacrylamide was that the acrylamide (AM) and acryloxyethyltrimethyl ammonium chloride (DAC) were initiated by potassium diperiodatocuprate, K5[Cu(HIO6)2](Cu(III)), initiating the self-condensing vinyl copolymerization of AM and DAC monomer
Summary
The process of coagulation and flocculation is one of the physicochemical unit processes in water and wastewater treatment [1, 2]. Flocculants may be inorganic or organic, small molecules or polymers [4] Based on their ionic nature, polymeric flocculants can be classified as anionic, nonionic, and cationic [5]. The synthesis of a branched polyacrylamide using a supernormal valence transition metal, such as potassium diperiodatocuprate K5[Cu(HIO6)2](Cu(III)), as an initiator, in alkaline medium, and being capable of initiating the selfcondensing vinyl polymerization (SCVP) of acrylamide, and the branched polyacrylamide was obtained [13]. We previously reported the synthesis of a branched nonionic polyacrylamide (BNPAM) [15] It demonstrated better flocculation properties for clay suspension, but did not show good flocculation performance for sewage. We developed a novel branched cationic flocculation agent It was synthesized using acrylamide (AM) and acryloxyethyltrimethyl ammonium chloride (DAC) in a selfcondensing vinyl copolymerization (SCVCP) reaction. Flocculation properties of polymers obtained were evaluated by the efficiencies of turbidity and chemical oxygen demand (COD) removal in a standard jar test with sewage
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