Functionalized polyacrylamide by xanthate for Cr (VI) removal from aqueous solution

Zhu, Guocheng; Liu, Junfei; Yin, Jun; Li, Zhongwu; Ren, Bin; Sun, Yongjun; Wan, Pingyu; Liu, Yunsi

doi:10.1016/j.cej.2015.12.043

Cited by 55 publications

(13 citation statements)

References 38 publications

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“…The stretching vibration absorption peak of C=O was observed at 1611.71 cm −1 –1664.75 cm −1 , which was produced by superimposing C=O absorption peaks in CMCTS and AM. The stretching vibration peak at 1084 cm −1 is attributed to an alcoholic hydroxyl group, and the characteristic absorption peak at 954 cm −1 is assigned to the methyl group of the quaternary ammonium group [33]. Comparison of the three FTIR spectra of CCPAD with CC and P(AM-DMC) in Figure 2 shows that the absorption peaks of NH stretching vibration at 3409 cm −1 and 3194 cm −1 are larger because of the superposition of the N-H absorption peaks in CMCS and AM.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, and Sludge Dewaterability Evaluation of the Chitosan-Based Flocculant CCPAD

Shi

Sun

et al. 2019

Polymers

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Carboxymethyl chitosan (CMCS), acrylamide, and methacryloxyethyltrimethyl ammonium chloride were used as co-monomers to produce a sludge dewatering agent carboxymethyl chitosan-graft-poly(acrylamide-methacryloxyethyltrimethyl ammonium chloride) (CCPAD) by UV-induced graft polymerization. Single-factor experiments and response surface methodology were employed to investigate and optimize the grafting rate, grafting efficiency, and intrinsic viscosity influenced by the total monomer concentration, CMCS concentration, cationic degree, pH value, and illumination time. The structure, surface morphology, and thermal stability of CCPAD were characterized by infrared spectroscopy, hydrogen nuclear magnetic resonance, X-ray diffraction, scanning electron microscopy, and differential thermal-thermogravimetry. The raw sludge with 97.9% water content was sourced from the concentrated tank of a sewage treatment plant and used in the sludge condition experiments. In addition, CCPAD was applied as the sludge conditioner to investigate the effects of cationic degree, intrinsic viscosity, and pH on the supernatant turbidity, moisture content, specific resistance to filtration, and sludge settling ratio. Moreover, the mechanism of sludge conditioning by CCPAD was discussed by examining the zeta potential and extracellular polymeric substance (EPS) content of the supernatant. The sludge dewatering results confirmed that CCPAD had excellent performance for improving sludge dewaterability.

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Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, and Sludge Dewaterability Evaluation of the Chitosan-Based Flocculant CCPAD

Shi

Sun

et al. 2019

Polymers

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“…The asymmetric stretching vibrations of −CH 3 and −CH 2 − groups were at 2941 and 2844 cm −1 , respectively. The bending vibration of −CH 2 − in −CH 2 −N + group of DAC was at 1453 cm −1 [19]. The bending vibration of −N + −(CH 3 ) 3 in DAC was observed at 961 cm −1 [20].…”

Section: Analytical Methods and Jarmentioning

confidence: 95%

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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“…Poliakrilamid; hidrojel tanımlaması yapıldığı günden beri üzerinde en çok çalışılan hidrojel olup, günümüzde absorban ve toprak düzenleyici olarak, atık suların arıtılmasında, kozmetik, kağıt ve tekstil endüstrisinde, elektroforez uygulamalarında yaygın kullanıma sahiptir [1][2][3][4][5][6][7]. Vinilik özellikteki sade monomeri çok kolay polimerleşir ve bu özelliği en çok tercih edilme nedenlerinden birisidir.…”

Section: öZetunclassified

Farklı çapraz bağlayıcılar ile hazırlanmış poliakrilamid hidrojellerinin değerlendirilmesi

Ekici

Erkol²

2017

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Functionalized polyacrylamide by xanthate for Cr (VI) removal from aqueous solution

Cited by 55 publications

References 38 publications

Synthesis, Characterization, and Sludge Dewaterability Evaluation of the Chitosan-Based Flocculant CCPAD

Synthesis, Characterization, and Sludge Dewaterability Evaluation of the Chitosan-Based Flocculant CCPAD

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

Farklı çapraz bağlayıcılar ile hazırlanmış poliakrilamid hidrojellerinin değerlendirilmesi

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