Ultrasonic-template technology inducing and regulating cationic microblocks in CPAM: characterization, mechanism and sludge flocculation performance

Feng, Li; Zheng, Huaili; Wang, Yili; Zhang, Shixin; Xu, Bincheng

doi:10.1039/c7ra03784h

Cited by 26 publications

(16 citation statements)

References 47 publications

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“…18 If the anionic units orderly distributes in the polymer chain of APAM to form the anionic microblock structure, the negative charge of the anionic group becomes more centralized and will neutralize the positive charged particles completely, thus increasing the charge neutralization ability. 19 Meanwhile, the strong repulsive force between anionic microblocks are advantageous for the stretch and extension of the polymer chain, and therefore the bridging ability of the polymer is improved. 20 Now, the most critical issue is to search for a new approach to prepare the novel APAM with microblock structure, whereas it is incapable for traditional synthesis methods.…”

Section: Introductionmentioning

confidence: 99%

Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

et al. 2017

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ab Ultraviolet (UV)-initiated template polymerization (UTP) was used as a feasible strategy to prepare a novel anionic polyacrylamide (APAM) with a microblock structure. In the template copolymerization system, acrylamide (AM) and sodium allylsulfonate (SAS) were used as monomers, and poly Results showed that the novel anionic microblock structure was formed in the template copolymer.Besides, the results of the association constant (K M ) indicated that the copolymerization followed I Zipup (ZIP) template polymerization mechanism, which indicated the formation of the microblock structure again. Parameters such as pH and dosage that affected the flocculation performance, flocculation kinetics and the FTIR spectra of the generated flocs were investigated to further observe the effect of anionic microblocks on flocculation performance and understand the relationship between the flocs and flocculants. Flocculation experimental results demonstrated that the anionic microblocks in the template copolymer could enhance the charge neutralization and bridging ability, and therefore an excellent flocculation performance of treating high turbidity water was observed.

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Section: Introductionmentioning

confidence: 99%

Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

et al. 2017

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“…The originally ordered structure of PAD was destroyed by the grafting of hydrophobic AODBAC, thus leading to a porous structure with a prodigious surface area which was favorable for the improving of flocculation and water solubility ability of PADA. Besides, Figure 5(b) also showed a linear correlation of the natural logarithms of the perimeter ( ) and the area ( ), indicating that the fractal dimension of the polymer surface could be calculated using Image-Pro Plus 6.0 software [22,23]. The results showed that the fractal dimensions of PAD and PADA were 1.236 and 1.403, respectively.…”

Section: Sem Of Polymersmentioning

confidence: 77%

“…PAD and PADA showed the following similar resonance peaks. The resonance peaks for the protons of −CH 2 − (a) and −CH− (b) at backbone of the polymer were observed at 1.63 ppm and 2.19 ppm, respectively [22]. The resonance peaks for the protons of −O−CH 2 − (c) were observed at 4.61 ppm.…”

Section: 12mentioning

confidence: 79%

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Synthesis of a Cationic Polyacrylamide under UV Initiation and Its Flocculation in Estrone Removal

Sun

et al. 2018

International Journal of Polymer Science

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A ternary cationic polyacrylamide (CPAM) with the hydrophobic characteristic was prepared through ultraviolet-(UV-) initiated polymerization technique for the estrone (E1) environmental estrogen separation and removal. The monomers of acrylamide (AM), acryloyloxyethyl-trimethyl ammonium chloride (DAC), and acryloyloxyethyl dimethylbenzyl ammonium chloride (AODBAC) were used to synthesize the ternary copolymer (PADA). Fourier transform infrared spectroscopy (FT-IR), 1 H nuclear magnetic resonance spectroscopy ( 1 H NMR), thermogravimetry/differential scanning calorimetry (TG/DSC), and scanning electron microscopy (SEM) were employed to characterize the structure, thermal decomposition property, and morphology of the polymers, respectively. FT-IR and 1 H NMR results indicated the successful formation of the polymers. Besides, with the introduction of hydrophobic groups (phenyl group), an irregular and porous surface morphology and a favorable thermal stability of the PADA were observed by SEM and TG/DSC analyses, respectively. At the optimal condition (pH = 7, flocculant dosage = 4.0 mg/L and E1 concentration = 0.75 mg/L), an excellent E1 flocculation performance (E1 removal rate: 90.1%, floc size: 18.3 m, and flocculation kinetics: 22.69 × 10 −4 s −1 ) was acquired by using the efficient flocculant PADA-3 (cationic degree = 40%, and intrinsic viscosity = 6.30 dL⋅g −1 ). The zeta potential and floc size analyses were used to analyze the possible flocculation mechanism for the E1 removal. Results indicated that the charge neutralization, adsorption, and birding effects were dominant in the E1 removal progress.

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“…The formed positively charged polymer electrolyte after dissolved in water can give full play to its electrical neutralization and adsorption bridging effect, so as to effectively flocculate compounds and colloidal substances in wastewater, so that these substances are easier to separate from water [7,8]. Because CPAM has the multiple function of turbidity removal, decolorization, adsorption, filtration and purification, it has been widely used in environment field, especially in sludge dewatering [9,10].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Assisted Synthesis of Cationic Polyacrylamide and Its Dewatering performance evaluation

Li¹,

Yang²,

Shou³

et al. 2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

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Abstract:In this study, an acid and alkali resistance cationic polyacrylamide flocculants (P(AM-MAPTAC)) was synthesized through copolymerization of acrylamide (AM) and methacrylamido propyl trimethyl ammonium chloride (MAPTAC) by innovative ultrasonic initiation technology. The structure and thermal decomposition property of the obtained polymer were observed through FTIR and TG/DSC measurements respectively. The dewatering performance of P(AM-MAPTAC) was also evaluated by measuring the supernatant residual turbidity (RT), moisture content of the filter cake (FCMC), and chemical oxygen demand (COD) removal rate of the sludge. The RT, FCMC, and COD reached 14.80 NTU, 83.72 %, and 66.8%, respectively, at 40 mg L −1 of P(AM-MAPTAC) and pH of 10.0. Furthermore, P (AM-MAPTAC) showed good acid and alkali resistance, and had better application value.

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Ultrasonic-template technology inducing and regulating cationic microblocks in CPAM: characterization, mechanism and sludge flocculation performance

Abstract: In this study, the ultrasonic-template polymerization technique (UTPT) was used to generate and regulate the distribution of cationic microblocks in a polymer.

Cited by 26 publications

References 47 publications

Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

Fabricating an anionic polyacrylamide (APAM) with an anionic block structure for high turbidity water separation and purification

Synthesis of a Cationic Polyacrylamide under UV Initiation and Its Flocculation in Estrone Removal

Ultrasonic Assisted Synthesis of Cationic Polyacrylamide and Its Dewatering performance evaluation

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