State Key Laboratory of Pulp and Paper Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Wushan Road 381, Guangzhou, Guangdong 510640, China.
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 6):127287. doi: 10.1016/j.ijbiomac.2023.127287. Epub 2023 Oct 6.
Flocculation is a common process for wastewater treatment. However, the most commonly used organic synthetic flocculants such as polyacrylamide are petroleum-based. In this work, biomass lignin was grafted with cationic starch to synthesize low-cost, green and fully biomass-based multifunctional flocculants. The cationic polyacrylamide was replaced by cheap industrial cationic starch. Hyperbranched multifunctional lignin-grafted cationic starch flocculant (CS-L) was successfully prepared via ring-opening reaction with epichlorohydrin. The mass content of lignin in the grafted product was between 16.6 % and 70.1 %. With the dosage of CS-L between 4.0 and 7.5 mg/l, the turbidity removal rate for 500 mg/l kaolin suspension reached more than 97 %. When the dosage of CS-L was 24 mg/l, the removal rate of 50 mg/l Cu reached 85.7 %. Importantly, when the mixed solution of kaolin particles and Cu was treated, the synchronous removal rates of kaolin and Cu reached 90 % and 72 % respectively in the range of 8.0-12.0 mg/l flocculant addition. The synthesized lignin-grafted cationic starch flocculant showed an excellent multifunctional flocculation function.
絮凝是一种常见的废水处理工艺。然而，最常用的有机合成絮凝剂，如聚丙烯酰胺，是以石油为基础的。在这项工作中，生物质木质素与阳离子淀粉接枝，合成了低成本、绿色、完全基于生物质的多功能絮凝剂。用廉价的工业阳离子淀粉代替了阳离子聚丙烯酰胺。通过与环氧氯丙烷的开环反应，成功制备了超支化多功能木质素接枝阳离子淀粉絮凝剂（CS-L）。接枝产物中木质素的质量含量在 16.6%至 70.1%之间。当 CS-L 的用量在 4.0 至 7.5 mg/l 之间时，对 500 mg/l 高岭土悬浮液的浊度去除率达到 97%以上。当 CS-L 的用量为 24 mg/l 时，对 50 mg/l Cu 的去除率达到 85.7%。重要的是，当处理高岭土颗粒和 Cu 的混合溶液时，在 8.0-12.0 mg/l 絮凝剂添加范围内，高岭土和 Cu 的同步去除率分别达到 90%和 72%。合成的木质素接枝阳离子淀粉絮凝剂表现出优异的多功能絮凝功能。
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