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

Feng, Li; Zheng, Huaili; Gao, Baoyu; Zhang, Shixin; Zhao, Chuanliang; Zhou, Yuhao; Xu, Bincheng

doi:10.1039/c7ra05151d

Cited by 45 publications

(26 citation statements)

References 48 publications

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“…For the APAM, the peaks at 3423 cm −1 and 3198 cm −1 were due to–NH 2 stretching vibrations, the peak at 1666 cm −1 was the characteristic absorption peak of the carbonyl group. The peak at 1617 cm −1 was due to the amide II (N–H) bending vibration [ 28 , 33 ]. What is more, the peaks at 1178 cm −1 and 1119 cm −1 were associated with C–N stretching vibration [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

“…In order to overcome such shortcoming, GO and Anionic polyacrylamide (APAM) complexes were first prepared in this article. APAM has functional groups with adsorption properties such as an amide group or a carboxyl group, and exhibits an electronegativity, which can lower the potential of the metal cation, and provide favorable ion adsorption capacity [ 26 , 27 , 28 ]. APAM can bridge between particles in water to concentrate particles and form floc deposits, which allows it to be used as a flocculant [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Preparation of RGO and Anionic Polyacrylamide Composites for Removal of Pb(II) in Aqueous Solution

Sun

et al. 2020

Polymers

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Graphene oxide (GO) have been reported as adsorbent materials, because its surface contains a large number of oxygen-containing groups, which provide masses of active sites. Nevertheless, it is difficult to separate GO from aqueous solution by conventional means after the end of the adsorption process. Therefore, ethylene diamine-reduced graphene oxide/anionic polyacrylamide (E-RGO/APAM), with a large quantity of adsorption sites and strong flocculation was prepared in this study. The composite E-RGO/APAM was characterized by Fourier transform infrared (FTIR), laser Raman spectrometer (IR), scanning electron microscope (SEM). The obtained results indicated that amino groups were successfully introduced into GO. Particle size test showed that the particle size of E-RGO/APAM is up to three micrometers, which can be separated from the water by conventional means, such as filtration and centrifugation, to avoid secondary pollution. The efficiency of E-RGO/APAM for removing Pb(II) was tested. The results showed that the process of adsorption of Pb(II) by E-RGO/APAM can be fitted by pseudo second order kinetic equation, indicating that the adsorption rate of the adsorbent depends on the chemisorption process, and the theoretical maximum adsorption amount of E-RGO/APAM is 400.8 mg/g. Based on these results, it can be stated that E-RGO/APAM is effective in the removal of Pb(II) from aqueous solutions, and provides a new method for the removal of heavy metal ions from industrial wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of RGO and Anionic Polyacrylamide Composites for Removal of Pb(II) in Aqueous Solution

Sun

et al. 2020

Polymers

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“…It is confirmed that the template PAAS has a significant effect on the R P and polymer conversion, and the template polymerization mechanism follows the typical (I) ZIP. [29] Because PAAS has the opposite charge to DMC, it can arrange and assemble DMC by electrostatic attraction. The cationic monomers adsorbed and sequentially arranged on the template PAAS can form the precursor of the cationic fragment structure.…”

Section: Effect Of N Paas :N Dmcmentioning

confidence: 99%

Study of microwave‐template initiated copolymerization peculiarity and evaluation on the coal floc distinctive behavior and flocculation performance

Chen

Feng

Liu

et al. 2020

J of Applied Polymer Sci

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Cationic polyacrylamide (CPAM) contains a large number of acylamino and positively charged methyl ammonium chloride groups. It has the advantages of good water solubility, strong adsorption bridging ability, enhanced charge neutralization and destabilization performance, excellent flocculation effect, and wide application. Therefore, CPAM can be used in the treatment of coal washing wastewater, and the research and development of a new flocculant with high efficiency is a hot topic in this field. Template copolymer (TPADM) of methacryloyloxyethyl trimethyl ammonium chloride (DMC) and acrylamide (AM) was synthesized by microwave‐template initiated polymerization with sodium polyacrylate (PAAS) as template. The microwave‐template initiated polymerization is abbreviated as MW‐TP. By analyzing FTIR, 1H (13C) NMR and TG/DSC of TPADM, it was found that TPADM had obvious cationic fragment structure. In addition, the association constant (KM) and the kinetics of the template reaction showed that the MW‐TP was confirmed to be free radical initiated polymerization and I Zip‐up (ZIP) polymerization mechanism, which demonstrated the formation of the cationic fragment structure again. This new cationic fragment structure greatly enhanced the ability of charge neutralization, electrical patching and adsorption bridging, thus improving the flocculation performance. Compared with cationic P(AM‐DMC) (CPADM), Commercial cationic polypropanamide (CCPAM‐1 and CCPAM‐2), TPADM had better flocculation effect on coal washing wastewater. Under the optimum flocculation conditions (dosage = 16 mg/L, pH = 7.5), suspended solid (SS) concentration and turbidity of coal washing wastewater treated by TPADM reached 14.3 mg/L and 8.7 NTU, respectively. The floc formation, breakage, and regeneration analyses showed that the cationic fragment structure in TPADM could contribute to the formation of large and high density flocculation structure (d50 ≥ 245 μm, Df ≥ 2.05), and these coal flocs can regenerate rapidly after being broken. Finally, these large and compact flocs help to accelerate the flocs sedimentation and reduce the SS concentration and turbidity of coal washing wastewater, and enhance the effect of solid–liquid separation.

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“…Anionic polyacrylamide (APAM) is a widely used organic polymer flocculent in tailings thickening and shows good performance and high efficiency at low cost, particularly in the treatment of fine particles [9,10]. For thickened tailings slurries in pipeline transportation, groups of shear tests were conducted, and the variation curves of rheological parameters were obtained.…”

Section: Introductionmentioning

confidence: 99%

Effect of Anionic Polyacrylamide on the Structural Stability of Thickened Tailings Slurry in Pipeline Transportation

Wang

Qin

et al. 2018

Advances in Materials Science and Engineering

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Taking the superfine tailings slurry (STS), fine tailings slurry (FTS), and unclassified tailings slurry (UTS) of a gold mine as examples, a series of laboratory shear tests were conducted to investigate the effect of anionic polyacrylamide (APAM) on the structural stability of the thickened tailings slurry in pipeline transportation. Experimental results showed that the FTS and UTS had shear-thinning and shear-thickening characteristics in the constant shear tests, respectively. After addition of APAM, when the shear rate was 30 s−1, standard deviations of apparent viscosity of FTS, UTS, and STS were 66.67%, 61.40%, and 35.33% lower, respectively. APAM enhances the strength of the flocculent structures, inhibits the hindered settling of the coarse-particle tailings, improves the structure stability of the solid particles on the structural plane, and assists pipeline transportation of the thickened tailings slurry.

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

Cited by 45 publications

References 48 publications

Preparation of RGO and Anionic Polyacrylamide Composites for Removal of Pb(II) in Aqueous Solution

Preparation of RGO and Anionic Polyacrylamide Composites for Removal of Pb(II) in Aqueous Solution

Study of microwave‐template initiated copolymerization peculiarity and evaluation on the coal floc distinctive behavior and flocculation performance

Effect of Anionic Polyacrylamide on the Structural Stability of Thickened Tailings Slurry in Pipeline Transportation

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