磁性 CoMoO/CoFeO 复合过一硫酸盐活化剂非自由基主导催化降解亚甲基蓝。
Non-radical-dominated catalytic degradation of methylene blue by magnetic CoMoO/CoFeO composite peroxymonosulfate activators.
机构信息
School of Chemistry and Environmental Engineering, Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Changchun University of Science and Technology, Changchun, 130022, PR China.
School of Chemistry and Environmental Engineering, Jilin Provincial Science and Technology Innovation Center of Optical Materials and Chemistry, Changchun University of Science and Technology, Changchun, 130022, PR China.
出版信息
J Environ Manage. 2023 Jan 1;325(Pt B):116587. doi: 10.1016/j.jenvman.2022.116587. Epub 2022 Oct 28.
In this study, magnetic CoMoO/CoFeO (CMO/CFO) nanospheres with a core-shell structure were synthesized via two-step hydrothermal methods. The obtained particles were employed as catalysts to activate peroxymonosulfate (PMS) and degrade methylene blue (MB). The physico-chemical characterizations of the synthesized CMO/CFO showed that the CMO shell contributed to the enhancement of redox conversion and the increase in the concentration of oxygen vacancies (OVs). By examining reactive oxygen species (ROS) in the CMO/CFO/PMS system, the MB degradation was dominated by a non-radical pathway, and O was identified as the most abundant ROS. Besides, the CMO/CFO exhibited faster reaction kinetics than the pristine CFO. Moreover, the magnetic properties guaranteed the recycling and reuse of CMO/CFO, and the removal rate of MB was maintained at ∼94% after continuous use five times. Both the tolerance to SOand the wide pH range where the material is applicable make it a promising catalyst for dyeing wastewater treatment.
在这项研究中，通过两步水热法合成了具有核壳结构的磁性 CoMoO/CoFeO（CMO/CFO）纳米球。所得颗粒被用作催化剂来激活过一硫酸盐（PMS）并降解亚甲基蓝（MB）。所合成的 CMO/CFO 的物理化学特性表明，CMO 壳有助于增强氧化还原转化和增加氧空位（OVs）的浓度。通过检查 CMO/CFO/PMS 体系中的活性氧物种（ROS），MB 的降解主要通过非自由基途径进行，并且确定 O 是最丰富的 ROS。此外，CMO/CFO 表现出比原始 CFO 更快的反应动力学。此外，磁性保证了 CMO/CFO 的回收和再利用，并且在连续使用五次后，MB 的去除率保持在约 94%。对 SO 的耐受性和适用的宽 pH 范围使其成为处理染色废水的有前途的催化剂。
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