Qin Hangdao, Xiao Rong, Shi Wei, Wang Yong, Li Hui, Guo Lei, Cheng Hao, Chen Jing
School of Material and Chemical Engineering, Tongren University Tongren 554300 China
School of Pharmacy, Tongren Polytechnic College Tongren 554300 China.
RSC Adv. 2018 Oct 3;8(59):33972-33979. doi: 10.1039/c8ra07144f. eCollection 2018 Sep 28.
A magnetic core-shell-structured FeO@CeO catalyst was prepared by a simple solvothermal method and applied in the solid state for catalytic wet peroxide oxidation (CWPO) of benzoic acid. The obtained catalyst was characterized by N adsorption-desorption, X-ray diffraction (XRD), magnetic measurements, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The experimental results showed that FeO@CeO possessed superior catalytic efficiency for CWPO of benzoic acid than that of FeO. The high catalytic activity was caused by a synergistic effect between FeO and CeO, which assisted the decomposition of HO into hydroxyl radicals (·OH). FeO@CeO exhibited low Fe leaching of 4.2 mg L, which approximately accounted for barely 0.76% of the total Fe amount in the catalyst. The effects of radical scavengers indicated that benzoic acid was degraded mainly by ·OH attack, which occurred both in the bulk solution and on the FeO@CeO surface. In the stability tests, there was loss of merely 4% in the benzoic acid removal rate after six cycles of reaction, and the saturation magnetization of FeO@CeO hardly changed, which suggested that the FeO@CeO catalyst was fairly effective in reutilization and stability.
通过简单的溶剂热法制备了一种核壳结构的磁性FeO@CeO催化剂，并将其应用于苯甲酸的固态催化湿式过氧化物氧化（CWPO）反应中。采用N2吸附-脱附、X射线衍射（XRD）、磁性测量、透射电子显微镜（TEM）和X射线光电子能谱（XPS）对所得催化剂进行了表征。实验结果表明，FeO@CeO对苯甲酸的CWPO催化效率优于FeO。高催化活性是由FeO和CeO之间的协同效应引起的，该协同效应促进了H2O2分解为羟基自由基（·OH）。FeO@CeO的铁浸出量低至4.2 mg L-1，约占催化剂中总铁含量的0.76%。自由基清除剂的影响表明，苯甲酸主要通过·OH攻击而降解，这在本体溶液和FeO@CeO表面均会发生。在稳定性测试中，经过六个循环反应后苯甲酸去除率仅损失4%，且FeO@CeO的饱和磁化强度几乎没有变化，这表明FeO@CeO催化剂在再利用和稳定性方面相当有效。
