Abstract
In this study, a new type of hydrophobic cationic polyacrylamide P (AM-DMC-DABC) (PADD) was synthesized by ultrasonic (US)-initiated polymerization, which is used for the separation and removal of coal mine wastewater. The acrylamide (AM), methacryloyloxyethyl trimethyl ammonium chloride (DMC) and acryloyloxyethyl dimethylbenzyl ammonium chloride (DABC) were used as monomers to prepare). The factors that affecting the US initiated polymerization of PADD were analyzed. Fourier transform infrared spectroscopy (FT-IR), 1H nuclear magnetic resonance (1H NMR) and scanning electron microscopy (SEM) were used to characterize the chemical structure, thermal decomposition performance and surface morphology of the polymers. FT-IR and 1H NMR results showed that PADD was successfully synthesized. In addition, irregular porous surface morphology of PADD were observed by SEM analysis. Under the optimum conditions (pH = 7.0, flocculant dosage = 16.0 mg/L), the excellent flocculation performance (turbidity removal rate (TR) = 98.8%), floc size d50 = 513.467 μm, fractal dimension (Df) = 1.61, flocculation kinetics (KN0) = 27.24 × 10−3·s−1) was obtained by using high-efficiency flocculant PADD. Zeta potential analysis was used to further explore the possible flocculation mechanism of removal. The zeta potential and flocculation analytical results displayed that the flocculation removal process of coal mine wastewater mainly included hydrophobic effect, adsorption, bridging and charge neutralization, and electric patching when PADD was used. The PADD showed more excellent coal mine wastewater flocculation performance than PAD, commercial cationic polyacrylamide (CPAM) CCPAM and PAM. Thus PADD, with its good flocculation effect on coal mine wastewater under relatively wide pH range, had bright practical application value.
Highlights
With the development of social economy and the increase of population in China, the contradiction between supply and demand of water resources has become increasingly prominent
Based on the above analysis results, it is proved that PADD is successfully synthesized by AM, DMC, and DABC
The results show that the fractal dimensions of PAM, PAD, and PADD are 1.173, 1.256, and 1.441, respectively
Summary
With the development of social economy and the increase of population in China, the contradiction between supply and demand of water resources has become increasingly prominent. Flocculation technology has the characteristics of simple operation, high efficiency, and low cost, and environmentally-friendly [10] It has attracted more and more attention in wastewater purification and separation [11]. DABC with hydrophobic groups (phenyl) can cause systems with unique rheological properties, resulting in the formation of transient networks and the increase of solution viscosity [22] These associations enhance the interaction between hydrophobic groups and colloidal particles, which is beneficial to improve the adsorption bridging capacity and enhance the flocculation effect [23]. AM:DMC:DABC on polymerization; (3) characterization of the chemical structure, morphology and experimental conditions such as ultrasonic power, pH, initiator V-50 mass fraction, the mass ratio of thermal properties of polymer PADD by Fourier transform infrared spectroscopy (FT-IR), 1H nuclear. As floc size, floc fractal dimension, and flocculation kinetics; and (5) study of flocculation mechanism involved in flocculation process
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