In this paper we present the results of the recovery of Ni(II) ions in aqueous media using poly(acrylamide-co-itaconic acid) hydrogels. The copolymer was synthetized via free radical polymerization at 30 °C using the potassium persulfate and N,N,N′,N′-tetramethylethylenediamine redox pair. Several methodologies were studied and compared by varying the following parameters: temperature, pH of the media, Ni(II) ion concentration and aqueous solution / xerogel weight ratio. Finally, the removal efficiency of the applications of the hydrogel and the influence of the parameters was measured. Our main result was found by swelling the hydrogel in an aqueous media with pH 13, then placed at the Ni(II) solution. With this methodology, the ion recovery performance was up to 94%, this because the polymeric matrix is saturated with a NaOH solution and the nickel ions cannot penetrate the hydrogel considerably. Thus instead of absorbing the Ni(II) ion, it reacts with the OH⁻ ions delivered at the surface of the hydrogel, forming Ni(OH)₂ layer at the surface, which is partially absorbed.

在本文中，我们介绍了使用聚丙烯酰胺-衣康酸水凝胶在水性介质中回收Ni（II）离子的结果。使用过硫酸钾和N，N，N'，N'在30°C下通过自由基聚合反应合成共聚物-四甲基乙二胺氧化还原对。通过改变以下参数，研究和比较了几种方法：温度，介质的pH值，Ni（II）离子浓度和水溶液/干凝胶重量比。最终，测量了水凝胶的去除效率和参数的影响。我们的主要结果是通过将水凝胶在pH值为13的水性介质中溶胀，然后置于Ni（II）溶液中发现的。使用这种方法，离子回收性能高达94％，这是因为聚合物基质被NaOH溶液饱和，并且镍离子无法充分渗透水凝胶。因此代替吸收镍（II）离子，它与OH反应^-在水凝胶的表面递送的离子，形成的Ni（OH）₂ 表面上的一层被部分吸收。