Abstract The modification of silica microparticles surface with a high number of amino/carboxylic groups of polymer chains represent an interesting route to obtain nanostructured composite materials aiming different applications. Herein, four weak polycations (PC) [polyethyleneimine (PEI), polylysine (PLL), polyvinylamine (PVAm), polyallylamine hydrochloride (PAH)] and one weak polyanion [polyacrylic acid (PAA)] were layer-by-layer deposited onto spherical silica to form composite microparticles. A strategy where each deposited polycation layer was chemically cross-linked with glutaraldehyde (GA) prior to the deposition of PAA layer was used, forming at the end silica//(PC GA/PAA)n composite microparticles. Finally, we investigated the particles towards their adsorption properties on metal ions (Cu2+, Pb2+, Ni2+, and Fe2+) from simulated and real surface water, as a potential application for the composite particles.

中文翻译：

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用于选择性重金属离子吸附的纳米结构聚合物复合材料

摘要 用大量聚合物链的氨基/羧基对二氧化硅微粒表面进行改性是获得针对不同应用的纳米结构复合材料的一条有趣途径。在此，四种弱聚阳离子 (PC) [聚乙烯亚胺 (PEI)、聚赖氨酸 (PLL)、聚乙烯胺 (PVAm)、聚烯丙胺盐酸盐 (PAH)] 和一种弱聚阴离子 [聚丙烯酸 (PAA)] 逐层沉积到球形二氧化硅形成复合微粒。使用一种策略，其中在沉积 PAA 层之前，每个沉积的聚阳离子层都与戊二醛 (GA) 进行化学交联，在末端形成二氧化硅//(PC GA/PAA)n 复合微粒。最后，我们研究了颗粒对金属离子（Cu2+、Pb2+、Ni2+、