Preparation and Flocculation Property of Cationic Chitosan‐DADMAC‐β‐Cyclodextrin Copolymer

Zeng, Jia; Guan, Guohao; Lou, Tao; Wang, Xue Jun

doi:10.1002/star.202100047

Cited by 8 publications

(7 citation statements)

References 47 publications

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“…Furthermore, the macromolecular chains of the starch flocculant extend in the water and can absorb multiple dye floc particles simultaneously. This leads to an increase in the size of the floc through a bridging effect and subsequently causes the floc to sediment under the force of gravity. , Generally speaking, the bridging effect is related to the concentration of flocculant. When the concentration of flocculant is low, it can promote the formation of flocs.…”

Section: Flocculation Effect Testmentioning

confidence: 99%

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%

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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“…It can neutralize the charge of dye ions, make them unstable, and bond to form micro oc. Furthermore, the macromolecular chains of starch occulant extending in the water can absorb multiple dye oc particles at the same time, lead to the size of oc increases through bridging effect, and then make the oc sediment under action of gravity [30,44]. Generally speaking, the bridging effect is related to the concentration of occulant.…”

Section: Flocculation Effect Test With Different Occulant Dosagementioning

confidence: 99%

Preparation of starch-based cationic flocculants and its study on the removal of textile dyes

Chang,

Cao,

et al. 2023

Preprint

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To effectively solve the problem of wastewater pollution. In this paper, a starch (St) based natural polymer cationic flocculant (DMSt-g-DMC) was prepared via a tetherification, esterification and grafting co-polymerization triple modification using corn starch as raw material, 3-chloro-2-hydroxypropyl triethylammonium chloride (CTA), vinyl acetate (VAC) and methylacryloxyethyltrimethyl ammonium chloride (DMC) were used as etherifying agents, esterifying agents and grafting monomers. The results by FT-IR, 13C NMR and XPS showed that acetyl, quaternary ammonium and DMC grafted chain segments were introduced into the starch macromolecular backbone. XRD, SEM analysis and polarized light observation showed that the structure of DMSt-g-DMC was disrupted water solubility was increased. Zeta potential test showed DMSt-g-DMC has increased positive charge quantity and isoelectric point PI. GPC analysis showed that DMSt-g-DMC maintained a high molecular weight and increased the degree of branching to improve flocculation performance. 94.1% removal of acid light yellow G by DMSt-g-DMC, 83.7% and 97.1% removal by reactive brilliant blue X-BR and direct lake blue 5B, respectively. St-g-DMC had a wide flocculation window from 5 g/L to 12 g/L. It also maintained good flocculation performance over a wide pH range. This is advantageous for treating wastewater with high alkalinity and complex composition.

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“…Based on these problems, more naturally derived polymers have become preferred by researchers, such as exopolysaccharide, [ 14 ] chitosan, [ 15–17 ] tannin, [ 18 ] and starch. [ 19–21 ] Starch, as a natural polymer compound, has the advantages of being renewable, widely available, inexpensive, and easily degradable.…”

Section: Introductionmentioning

confidence: 99%

Study on the Flocculation Performance of a Cationic Starch‐Based Flocculant on Humic Substances in Textile Dyeing Wastewater

et al. 2022

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Dissolved organic matter is one of the difficult problems in the treatment of textile dyeing wastewater, among which humic substances are the most harmful to the environment and human health. Herein, cationic starch‐based flocculants are prepared by free radical polymerization of corn starch (St) and methacryloyloxyethyl trimethyl ammonium chloride (DMC) in a redox‐initiated system of ammonium persulfate and sodium bisulfite. Corn starch‐graft‐poly(methacryloyloxyethyl trimethyl ammonium chloride) is denoted as St‐g‐PDMC. The St‐g‐PDMC is comprehensively characterized in terms of structural (element analysis, Fourier transform infrared, X‐ray diffraction, proton nuclear magnetic resonance spectroscopy), morphological (scanning electron microscopy), and thermal (differential scanning calorimetry) properties. Humic acid (HA) solution is selected to simulate negatively charged dissolved organic matter. The flocculation performance and mechanism of St‐g‐PDMC, cationic polyacrylamide (CPAM), and polymerized aluminum chloride (PAC) are systematically investigated. The experimental results show that St‐g‐PDMC functions mainly through the electric neutralization and bridging effect as the flocculation mechanism, CPAM using its own structure and the colloid formed by PAC through hydrolysis is more in line with the bonded bridging and net roll sweep trapping. The combined formulation of St‐g‐PDMC and PAC shows advantages over a single flocculant in the treatment of textile dyeing wastewater, and its cost is evaluated.

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Preparation and Flocculation Property of Cationic Chitosan‐DADMAC‐β‐Cyclodextrin Copolymer

Cited by 8 publications

References 47 publications

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

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

Preparation of starch-based cationic flocculants and its study on the removal of textile dyes

Study on the Flocculation Performance of a Cationic Starch‐Based Flocculant on Humic Substances in Textile Dyeing Wastewater

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