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Abstract
In this work, a novel cationic polyacrylamide (PAMD) was synthesized by acrylamide (AM) diallyl dimethyl ammonium chloride (DMD) and dodecyl polyglucoside (DPL) under low-pressure ultraviolet (UV) initiation. The intrinsic viscosity and cationic degree of PAMD were optimized in copolymerization. The optimum synthesis conditions that affect polymerization were determined to be solid content 30%, DPL content 25%, DMD content 30%, illumination time 135 min, and pH 9. The flocculation performance of flocculant PAMD with a high cationic degree was investigated in the purification of high-turbidity water. The flocculation mechanism was correspondingly studied and summarized based on Fourier transform-infrared (FTIR) analysis. Finally, the results of an experimental simulation using the response surface method show that 98.9% supernatant transmittance was achieved under dosage 4 mg/L, fast stirring time 20 min, pH 7, and stirring speed 320 rpm.
Highlights
Water treatment has always been a major problem in environmental governance
A cationic polyacrylamide flocculant synthesized by dimethyl ammonium chloride (DMD), AM, and hydrophobic monomer butylacrylate (BA) was reported to have its flocculation performance obviously improved due to hydrophobic associations [16]
Zheng et al [20] reported that the anionic polyacrylamide P (AM/AA/AMPS) was synthesized by ultraviolet light (500 W), and the flocculation of P (AM/AA/AMPS) to dioctyl phthalate (DOP) in water was studied
Summary
Water treatment has always been a major problem in environmental governance. The purification of high-turbidity water caused by industrialization and urbanization is one of the serious problems in water treatment [1,2]. A cationic polyacrylamide flocculant synthesized by DMD, AM, and hydrophobic monomer butylacrylate (BA) was reported to have its flocculation performance obviously improved due to hydrophobic associations [16]. Zheng et al [20] reported that the anionic polyacrylamide P (AM/AA/AMPS) was synthesized by ultraviolet light (500 W), and the flocculation of P (AM/AA/AMPS) to dioctyl phthalate (DOP) in water was studied. Compared with high-voltage ultraviolet light, low-pressure UV initiation has lower energy consumption, lower carbon environmental protection, and less heat produced in the reaction process [21]. The prepared polymer products have good stability, high purity, and short dissolution time In this present study, a flocculant PAMD was synthesized by AM, DMD and DPL under low-pressure UV initiation for flocculation of high-turbidity water. The relationship between the factors and the experimental indexes was analyzed by the response surface method, and the optimal experimental conditions are determined for further application
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