The Study of Acrylamide/(N-Hydroxyethyl)acrylamide Copolymer as a Flocculant for Kaolin Suspensions

IF 5 3区工程技术 Q2 ENGINEERING, ENVIRONMENTAL

Journal of Polymers and the Environment Pub Date : 2025-07-02 DOI:10.1007/s10924-025-03633-1

Mehtab Nusrullah, Bin Lu, Guilan Miao, Amna Bibi, Yanmei Wang

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Abstract

Acrylamide-based non-ionic polymers have gained significant attention for wastewater treatment due to their high flocculation efficiency. However, optimizing the polymer dosage and knowing the role of hydrogen bonding in flocculation remain challenging. In this study, acrylamide/(N-hydroxyethyl)acrylamide (AM/HEA) copolymers at different molar ratios were synthesized via solution polymerization. The polymers were characterized using FTIR, ¹H NMR, DSC, and TGA. The kaolin suspension was employed to evaluate the flocculation performance of copolymers by the jar test method. The AM/HEA copolymers showed superior flocculation efficiency, achieving 98% turbidity removal at an optimal polymer flocculant dose of 0.2 mg/L, with a stirring speed of 400 rpm and a stirring time of 180 s. Zeta potential and TEM imaging results showed that flocculation primarily occurred through polymer adsorption on the kaolin surface, with its coiled conformation may enhance particle bridging. These results emphasize the critical role of polymer molecular structure in optimizing flocculation performance and suggest AM/HEA copolymers as efficient flocculants for water treatment exercises.

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丙烯酰胺/（n -羟乙基）丙烯酰胺共聚物作为高岭土悬浮液絮凝剂的研究

基于丙烯酰胺的非离子聚合物因其高絮凝效率在污水处理中受到广泛关注。然而，聚合物用量的优化和氢键在絮凝中的作用仍然是一个挑战。本研究采用溶液聚合法制备了不同摩尔比的丙烯酰胺/（n -羟乙基）丙烯酰胺/HEA共聚物。采用FTIR、1H NMR、DSC和TGA对聚合物进行了表征。以高岭土悬浮液为研究对象，采用瓶法对共聚物的絮凝性能进行了评价。AM/HEA共聚物表现出优异的絮凝效果，最佳絮凝剂用量为0.2 mg/L，搅拌速度为400 rpm，搅拌时间为180 s，絮凝效果可达98%。Zeta电位和TEM成像结果表明，高岭土的絮凝主要是通过聚合物在高岭土表面的吸附发生的，高岭土的卷曲构象可以增强颗粒的桥接作用。这些结果强调了聚合物分子结构在优化絮凝性能中的关键作用，并建议AM/HEA共聚物作为高效的水处理絮凝剂。

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来源期刊

Journal of Polymers and the Environment 工程技术-高分子科学

CiteScore

9.50

自引率

7.50%

发文量

297

审稿时长

9 months

期刊介绍： The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.