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<p>In this study, the target product, DMSt-<i>g</i>-DMDAAC, was successfully synthesized via esterification, etherification, and grafting reactions, using corn starch (St) and dimethyldiallyl ammonium chloride (DMDAAC) as raw materials. To further explore the mechanism underlying the influence of various reaction conditions on the performance of DMSt-<i>g</i>-DMDAAC, the key parameters of the etherification, esterification, and grafting reactions, such as reaction temperature, reaction time, and reagent dosage, were systematically investigated. The flocculation tests demonstrated that the removal efficiencies of Direct Lake Blue 5B, Acid Light Yellow G, and Reactive Brilliant Blue X-BR by DMSt-<i>g</i>-DMDAAC were 93%, 86.4% and 80.4%, respectively. Moreover, DMSt-<i>g</i>-DMDAAC exhibited a wide flocculation window and could maintain satisfactory flocculation performance within a broad pH range (4–10). Finally, the flocculation effect of DMSt-<i>g</i>-DMDAAC in combination with PAC on the flocculated dyes was examined. When the dosage of PAC was 100&#xa0;mg/L and that of DMSt-<i>g</i>-DMDAAC was 30&#xa0;mg/L, the removal rates of Disperse Red FB, Disperse Yellow 2G-FL, and Disperse Blue E-4R reached 84.5%, 88.3% and 84.4%, respectively. In summary, this novel graft copolymer is an excellent flocculant that holds great potential for further industrial applications and offers valuable research insights for the treatment of printing and dyeing wastewater both at home and abroad.</p> Graphical abstract <p></p>

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Preparation of cationic starch flocculants by etherification, esterification and grafting approach for removal of textile dyes

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Hao Zhang,
  • Shuchen Cao,
  • Rui Zhang,
  • Jiaqian Li,
  • Yang Ding,
  • Haitao Wang,
  • Xiaoxu Zhao,
  • Na Chang

摘要

In this study, the target product, DMSt-g-DMDAAC, was successfully synthesized via esterification, etherification, and grafting reactions, using corn starch (St) and dimethyldiallyl ammonium chloride (DMDAAC) as raw materials. To further explore the mechanism underlying the influence of various reaction conditions on the performance of DMSt-g-DMDAAC, the key parameters of the etherification, esterification, and grafting reactions, such as reaction temperature, reaction time, and reagent dosage, were systematically investigated. The flocculation tests demonstrated that the removal efficiencies of Direct Lake Blue 5B, Acid Light Yellow G, and Reactive Brilliant Blue X-BR by DMSt-g-DMDAAC were 93%, 86.4% and 80.4%, respectively. Moreover, DMSt-g-DMDAAC exhibited a wide flocculation window and could maintain satisfactory flocculation performance within a broad pH range (4–10). Finally, the flocculation effect of DMSt-g-DMDAAC in combination with PAC on the flocculated dyes was examined. When the dosage of PAC was 100 mg/L and that of DMSt-g-DMDAAC was 30 mg/L, the removal rates of Disperse Red FB, Disperse Yellow 2G-FL, and Disperse Blue E-4R reached 84.5%, 88.3% and 84.4%, respectively. In summary, this novel graft copolymer is an excellent flocculant that holds great potential for further industrial applications and offers valuable research insights for the treatment of printing and dyeing wastewater both at home and abroad.

Graphical abstract