Fernandes Ricardo J C, Magalhães Carlos A B, Amorim Carlos O, Amaral Vítor S, Almeida Bernardo G, Castanheira Elisabete M S, Coutinho Paulo J G
Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
Physics Department and CICECO, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal.
Materials (Basel). 2019 Oct 31;12(21):3582. doi: 10.3390/ma12213582.
Magnetic nanoparticles of zinc/calcium ferrite and decorated with silver were prepared by coprecipitation method. The obtained nanoparticles were characterized by UV/Visible absorption, XRD, TEM and SQUID. The mixed zinc/calcium ferrites exhibit an optical band gap of 1.78 eV. HR-TEM imaging showed rectangular nanoplate shapes with sizes of 10 ± 3 nm and aspect ratio mainly between 1 and 1.5. Magnetic measurements indicated a superparamagnetic behavior. XRD diffractograms allowed a size estimation of 4 nm, which was associated with the nanoplate thickness. The silver-decorated zinc/calcium ferrite nanoparticles were successfully employed in the photodegradation of a model dye (Rhodamine B) and industrial textile dyes (CI Reactive Red 195, CI Reactive Blue 250 and CI Reactive Yellow 145). The nanosystems developed exhibited promising results for industrial application in effluent photoremediation using visible light, with the possibility of magnetic recovery.
采用共沉淀法制备了负载银的锌/钙铁氧体磁性纳米粒子。通过紫外/可见吸收光谱、X射线衍射（XRD）、透射电子显微镜（TEM）和超导量子干涉仪（SQUID）对所得纳米粒子进行了表征。混合锌/钙铁氧体的光学带隙为1.78 eV。高分辨透射电子显微镜成像显示纳米粒子呈矩形板状，尺寸为10±3 nm，纵横比主要在1至1.5之间。磁性测量表明其具有超顺磁性行为。XRD衍射图谱估计纳米粒子尺寸为4 nm，这与纳米板的厚度有关。负载银的锌/钙铁氧体纳米粒子成功应用于模型染料（罗丹明B）和工业纺织染料（CI活性红195、CI活性蓝250和CI活性黄145）的光降解。所开发的纳米系统在利用可见光进行废水光修复的工业应用中显示出了有前景的结果，并且具有磁回收的可能性。
