Yang Ruixia, Peng Qiaohong, Ahmed Adeel, Gao Fengyuan, Yu Bing, Shen Youqing, Cong Hailin
College of Chemistry and Chemical Engineering College of Materials Science and Engineering College of Environmental Science and Engineering Institute of Biomedical Materials and Engineering, Qingdao University, Qingdao, 266071, P. R. China.
State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao, 266071, P. R. China.
Chemistry. 2023 Mar 1;29(13):e202203097. doi: 10.1002/chem.202203097. Epub 2023 Jan 26.
The yolk-shell Co O @Fe O /C nanocomposites with Co O as the core, Fe O /C as the shell, and a cavity structure were synthesized by the hard template method. The physical and chemical properties of the composites were characterized by SEM, TEM, XRD, TGA, XPS, BET, and VSM. The specific surface area of yolk-shell Co O @Fe O /C nanocomposites is 175.9 m g , showing superparamagnetic properties. The yolk-shell Co O @Fe O /C nanocomposites were used as heterogeneous Fenton catalysts to activate peroxymonosulfate (PMS) to degrade MB, which showed high catalytic degradation performance. The degradation rate of MB reached 100 % within 30 min under the circumstances of the yolk-shell Co O @Fe O /C nanocomposites dosage of 0.1 g L , the PMS dosage of 1.0 g L , the initial MB concentration of 100 mg L , an initial pH of 5.5, and a temperature of 30±2 °C. The enhanced catalytic performance of the yolk-shell Co O @Fe O /C nanocomposites can be attributed to the synergistic effect of the two catalytically active materials and the middle cavity. The effects of different operating parameters and co-existing anion species on MB degradation were also investigated. Electron paramagnetic resonance (EPR) analysis and quenching experiments confirmed that the formation of SO ⋅ in the yolk-shell Co O @Fe O /C/PMS system contributes to MB degradation. In addition, yolk-shell Co O @Fe O /C nanocomposites can be easily separated from the pollutant solution under the action of an external magnetic field, and the degradation rate of MB can still reach 98 % after five cycles, indicating that it has good stability and reusability and has broad application prospects in the field of water purification.
采用硬模板法合成了以CoO为核、FeO/C为壳且具有中空结构的蛋黄壳型CoO@FeO/C纳米复合材料。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射仪（XRD）、热重分析仪（TGA）、X射线光电子能谱仪（XPS）、比表面积分析仪（BET）和振动样品磁强计（VSM）对复合材料的物理和化学性质进行了表征。蛋黄壳型CoO@FeO/C纳米复合材料的比表面积为175.9 m²/g，表现出超顺磁性。将蛋黄壳型CoO@FeO/C纳米复合材料用作非均相芬顿催化剂来活化过一硫酸盐（PMS）以降解亚甲基蓝（MB），其表现出较高的催化降解性能。在蛋黄壳型CoO@FeO/C纳米复合材料用量为0.1 g/L、PMS用量为1.0 g/L、初始MB浓度为100 mg/L、初始pH值为5.5以及温度为30±2℃的条件下，MB的降解率在30分钟内达到100%。蛋黄壳型CoO@FeO/C纳米复合材料催化性能的增强可归因于两种催化活性材料和中间空腔的协同效应。还研究了不同操作参数和共存阴离子种类对MB降解的影响。电子顺磁共振（EPR）分析和猝灭实验证实，蛋黄壳型CoO@FeO/C/PMS体系中硫酸根自由基（SO₄·）的形成有助于MB的降解。此外，蛋黄壳型CoO@FeO/C纳米复合材料在外加磁场作用下可轻松从污染物溶液中分离出来，经过五次循环后MB的降解率仍可达到98%，表明其具有良好的稳定性和可重复使用性，在水净化领域具有广阔的应用前景。
