Grain & Corn Engineering Technology Research Center, State Administration of Grain, Henan University of Technology, Zhengzhou, 450001, PR China; College of Food Science and Technology, Henan University of Technology, Zhengzhou, 450001, PR China.
College of Food Science and Technology, Henan University of Technology, Zhengzhou, 450001, PR China; School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, 450001, PR China.
J Hazard Mater. 2020 Jan 5;381:120915. doi: 10.1016/j.jhazmat.2019.120915. Epub 2019 Jul 22.
Safety concerns pertaining towards fungal occurrence in oil commodities have been a significant threat to human health. In this research, magnetic composite adsorbents were fabricated for the removal of aflatoxin B (AFB) from contaminated oils. To this goal, graphene oxides (GO) were synthesized using Hummer's method, and graphenes (rGO) were obtained by the reduction of GO by sodium borohydride. Thereafter, magnetic graphene oxides (MGO) and magnetic graphenes (MrGO) were prepared by coprecipitation of iron oxides on GO and rGO nanosheets, respectively. The as-prepared MGO and MrGO were characterized by SEM, TEM, FT-IR, XRD, VSM, and nitrogen adsorption-desorption techniques. Results showed that MGO had two-dimensional layered nanostructure with many wrinkles on its surface, and the FeO nanoparticles were essentially encapsulated onto the composite. The adsorption behaviors for the composite adsorbents especially for the removal of AFB from contaminated oils were systematically explored by varying adsorbent dosage, contact time, adsorption temperature and initial AFB concentration. The MGO adsorbent could have great potential in the application of AFB removal from contaminated oils, with the merits of facile magnetic separation and high removal efficiency. However, the removal process also causes a loss of the triglyceride, pigment, and beneficial micronutrients in the oil feedstocks.
关于油类商品中真菌发生的安全问题一直对人类健康构成重大威胁。在这项研究中，制备了磁性复合吸附剂以去除受污染油脂中的黄曲霉毒素 B（AFB）。为此，使用 Hummer 法合成了氧化石墨烯（GO），并通过硼氢化钠还原 GO 得到了还原氧化石墨烯（rGO）。然后，通过 GO 和 rGO 纳米片上的氧化铁共沉淀分别制备了磁性氧化石墨烯（MGO）和磁性石墨烯（MrGO）。通过 SEM、TEM、FT-IR、XRD、VSM 和氮气吸附-脱附技术对所制备的 MGO 和 MrGO 进行了表征。结果表明，MGO 具有二维层状纳米结构，表面有许多褶皱，FeO 纳米颗粒基本上被包裹在复合材料中。通过改变吸附剂用量、接触时间、吸附温度和初始 AFB 浓度，系统地研究了复合吸附剂特别是 MGO 吸附剂对受污染油脂中 AFB 的吸附行为。MGO 吸附剂在去除受污染油脂中的 AFB 方面具有很大的应用潜力，具有易于磁性分离和高去除效率的优点。然而，去除过程也会导致油脂原料中的甘油三酯、色素和有益微量营养素的损失。
