Synthesis, characterization, and flocculation performance of cationic starch nanoparticles

A series of cationic starches with different degrees of substitution were synthesized by etherification of potato starch with 3-chloro-2-hydroxypropyl trimethylammonium chloride (CTA). Cationic starch nanoparticles (CTA-StNPs) with different sizes were prepared by precipitation. Flocculation behavio...

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Veröffentlicht in:Carbohydrate polymers 2021-10, Vol.269, p.118337-118337, Article 118337
Hauptverfasser: Chang, Yanjiao, Hu, Zhiqing, Wang, Peizhuang, Zhou, Jiang
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Sprache:eng
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Zusammenfassung:A series of cationic starches with different degrees of substitution were synthesized by etherification of potato starch with 3-chloro-2-hydroxypropyl trimethylammonium chloride (CTA). Cationic starch nanoparticles (CTA-StNPs) with different sizes were prepared by precipitation. Flocculation behaviors of the CTA-StNPs in simulated water sample containing kaolin were studied. The results showed that the dosage required to bring the simulated water sample containing kaolin to attain maximum transmittance at pH = 4 was significantly less than that at pH = 7. Both the size and degree of substitution of the CTA-StNPs affected their flocculation performance. The smaller the size and the higher the degree of substitution of CTA-StNPs, the better was the flocculation performance. Charge neutralization played a leading role in the flocculation process. The adsorption process of the CTA-StNPs onto kaolin could be divided into rapid adsorption, stable adsorption and equilibrium adsorption and followed pseudo second-order kinetic equation very well (R2 > 0.99). •Cationic starches with different degrees of substitution were synthesized.•Cationic starch nanoparticles with different sizes were prepared by precipitation.•Flocculation behaviors of starch nanoparticles the in water containing kaolin were studied.•The adsorption process followed a pseudo second-order kinetic equation very well.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2021.118337