Otero-González, Mikhalovsky, Václavíková, Trenikhin, Cundy, Savina (2020) Novel nanostructured iron oxide cryogels for arsenic (As(III)) removal Journal of hazardous materials 381() 120996


Novel macroporous iron oxide nanocomposite cryogels were synthesized and assessed as arsenite (As(III)) adsorbents. The two-step synthesis method, by which a porous nanonetwork of iron oxide is firstly formed, allowed a homogeneous dispersion of the iron oxide in the cryogel reaction mixture, regardless of the nature of the co-polymer forming the cryogel structure. The cryogels showed excellent mechanical properties, especially the acrylamide-based cryogel. This gel showed the highest As(III) adsorption capacity, with the maximum value estimated at 118 mg/g using the Langmuir model. The immobilization of the nanostructured iron oxide gel into the cryogel matrix resulted in slower adsorption kinetics, however the cryogels offer the advantage of a stable three-dimensional structure that impedes the release of the iron oxide nanoparticles into the treated effluent. A preliminary toxicity evaluation of the cryogels did not indicate any apparent inhibition of human hepatic cells activity, which together with their mechanical stability and high adsorption capacity for As(III) make them excellent materials for the development of nanoparticle based adsorption devices for drinking water treatment. Copyright © 2019 Elsevier B.V. All rights reserved.

合成了新型的大孔氧化铁纳米复合材料冷冻凝胶,并评估为亚砷酸盐(As(III))吸附剂。通过其首先形成氧化铁的多孔纳米网络的两步合成方法允许氧化铁在冷冻凝胶反应混合物中均匀分散,而不管形成冷冻凝胶结构的共聚物的性质如何。冷冻凝胶显示出优异的机械性能,尤其是基于丙烯酰胺的冷冻凝胶。该凝胶显示出最高的As(III)吸附能力,使用Langmuir模型估计最大值为118mg / g。将纳米结构氧化铁凝胶固定到冷冻凝胶基质中导致较慢的吸附动力学,然而冷冻凝胶提供稳定的三维结构的优点,其阻止氧化铁纳米颗粒释放到处理过的流出物中。冷冻凝胶的初步毒性评价并未表明对人肝细胞活性的任何明显抑制,这与其机械稳定性和对As(III)的高吸附能力一起使得它们成为用于饮用水处理的纳米颗粒基吸附装置的开发的优异材料。 。版权所有©2019 Elsevier BV保留所有权利。