Preparation of starch-acrylic acid-carboxymethyl cellulose copolymer and its flocculation performance towards methylene blue

Jiao, Ruixue; Lou, Tao; Zhang, Heng; Wang, Xuejun

doi:10.1016/j.bej.2022.108635

Cited by 9 publications

(7 citation statements)

References 49 publications

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“…Therefore, the grafted starch macromolecules have a high positive charge density in a wide pH range. Moreover, they can give full play to the adsorption and electrical neutralization of dye ions in water to form microflocs, which in turn form flocs and settle under the bridging effect . The flocculation effect of starch flocculants decreases when the pH increases above 12, and this can be based on two reasons.…”

Section: Flocculation Effect Testmentioning

confidence: 99%

“…Moreover, they can give full play to the adsorption and electrical neutralization of dye ions in water to form microflocs, which in turn form flocs and settle under the bridging effect. 23 The flocculation effect of starch flocculants decreases when the pH increases above 12, and this can be based on two reasons. First, the deprotonation of hydroxyl groups in starch flocculant produces an electrostatic repulsion effect with negative dye ions.…”

Section: Test Of Flocculation Effect Under Different Ph Conditionsmentioning

confidence: 99%

“…The absorption peak of St at 3428 cm −1 is assigned to the stretching vibration of −OH on the glucose structural unit of starch, while the characteristic peak caused by the stretching vibration of C−H in the glucose structural unit appears at 2930 cm −1 . 22 The stretching vibration of −OH in the range of 3200 to 3400 cm −1 for DMSt-g-DMC is relatively weakened compared to that with St. Because the etherification and esterification cause part of the −OH transform into C− O−C on a large number of glucose units, 23 the C�O stretching vibration absorption peak appeared at 1729 cm −1 due to the introduction of C�O by esterification of VAC and grafting polymerization of DMC monomer chain units. The C−N stretching vibration absorption peak appeared at 1265 cm −1 , due to the introduction of the quaternary amine group in CTA and DMC during etheration and grafting, respectively.…”

Section: Fourier Infrared Spectroscopy Characterization (Ftir)mentioning

confidence: 99%

“…From the curve (St), it can be seen that there are obvious diffraction peaks of natural starch 15, 17, 18, and 23°, indicating that the starch is a type A gramineous starch. 23 The starch granules are semicrystalline in structure, and their crystalline regions are mainly maintained by intermolecular hydrogen bonds of the starch macromolecules. Natural starch has a large number of hydrogen bonds between macromolecules, which leads to poor water solubility.…”

Section: X-ray Diffraction Characterization (Xrd)mentioning

confidence: 99%

“…The stretching vibration of -OH in the range of 3200 cm -1 to 3400 cm -1 for DMSt-g-DMC is relatively weakened compared to that with St, becausethe etheri cation and esteri cation cause part of the -OH transform into C-O-C on a large number of glucose units. C = O stretching vibration absorption peak appeared at 1729 cm -1 due to the introduction of C = O by esteri cation of VAC and grafting polymerization of DMC monomer chain units [19]. At 1376cm -1 is the C-H bending vibration absorption peak connected to the double bond after the double bond was broken in DMC after grafting.…”

Section: Fourier Infrared Spectroscopy Characterization (Ft-ir)mentioning

confidence: 99%

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Preparation of Starch-Based Cationic Flocculants and Its Study on the Removal of Textile Dyes

Chang,

Cao,

et al. 2024

Ind. Eng. Chem. Res.

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To effectively solve the problem of wastewater pollution, in this paper, corn starch, 3-chloro-2-hydroxypropyl trimethylammonium chloride (CTA), vinyl acetate (VAC), and methylacryloxyethyltrimethylammonium chloride (DMC) were used as raw material, etherifying agent, esterifying agent, and grafting monomer, respectively. A starch (St)-based natural polymer cationic flocculant (DMSt-g-DMC) was prepared via etherification, esterification, and grafting copolymerization triple modification. This study is of great significance for the removal of dyes from wastewater. There are two keys to success. First, DMSt-g-DMC not only enhances flocculation but also improves water solubility through triple modification. Second is grafting reaction, in which the number of positive charges in the main chain of the DMSt-g-DMC macromolecule is further increased and its molecular structure adjusted to give full play to its electrical neutralization, bridging, and net trapping effects on anionic dyes in the water, so as to achieve the purpose of improving the flocculation effect. The removal rates of DMSt-g-DMC were 94.1% for Acid Light Yellow G, 83.7% for Reactive Brilliant Blue X-BR, and 97.1% for Direct Lake Blue 5B. DMSt-g-DMC not only has a wide flocculation window but also maintains good flocculation performance in a wide pH range, which is conducive to the treatment of wastewater with high alkalinity and complex composition. Finally, the removal rate of dye was tested when DMSt-g-DMC and PAC were flocculated together; the dosages of DMSt-g-DMC and PAC were 70 and 100 mg/L, respectively. The removal rates of Disperse Red GS, Disperse Yellow 2G-FL, and Direct Lake Blue 5B reached 87.5, 89.8, and 95.6%, respectively. In addition, DMSt-g-DMC and PAC remained stable after a long flocculation time, which may bring far-reaching changes if applied in industrial wastewater treatment.

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Section: Flocculation Effect Testmentioning

confidence: 99%

Section: Test Of Flocculation Effect Under Different Ph Conditionsmentioning

confidence: 99%