Predescu Andra Mihaela, Matei Ecaterina, Berbecaru Andrei Constantin, Râpă Maria, Sohaciu Mirela Gabriela, Predescu Cristian, Vidu Ruxandra
Faculty of Materials Sciences and Engineering, University Politehnica of Bucharest, 060042 Bucharest, Romania.
Department of Electrical and Computer Engineering, University of California Davis, One Shields Avenue, Davis, CA 95616, USA.
Materials (Basel). 2021 May 13;14(10):2539. doi: 10.3390/ma14102539.
The need to recycle and develop nanomaterials from waste, and use them in environmental applications has become increasingly imperative in recent decades. A new method to convert the mill scale, a waste of the steel industry that contains large quantity of iron and low impurities into a nanoadsorbent that has the necessary properties to be used for water purification is presented. The mill scale waste was used as raw material for iron oxide nanopowder. A thorough characterization was performed in each stage of the conversion process from the mill scale powder to magnetic nanopowder including XRD (X-ray diffraction), SEM (scanning electron microscopy), TEM (transmission electron microscopy), BET (Brunauer, Emmett and Teller) and magnetization properties. Iron oxide nanoparticles were approximately 5-6 nm with high specific surface area and good magnetic properties. These are the necessary properties that a magnetic nanopowder must have in order to be used as nanoadsorbents in the heavy metal removal from waters. The iron oxide nanoparticles were evaluated as adsorbents for the removal of Cu, Cd and Ni ions.
近几十年来，回收和利用废弃纳米材料并将其应用于环境领域的需求变得愈发迫切。本文提出了一种新方法，可将轧钢鳞片（钢铁行业的一种废料，含铁量高且杂质少）转化为具有水净化所需特性的纳米吸附剂。轧钢鳞片废料被用作制备氧化铁纳米粉末的原料。在从轧钢鳞片粉末到磁性纳米粉末的转化过程的每个阶段，都进行了全面的表征，包括X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、比表面积测定（BET）以及磁化特性分析。氧化铁纳米颗粒的粒径约为5 - 6纳米，具有高比表面积和良好的磁性。这些是磁性纳米粉末用作从水中去除重金属的纳米吸附剂所必须具备的特性。对氧化铁纳米颗粒作为去除铜、镉和镍离子的吸附剂进行了评估。
