Qixu Shi , Juexiu Li , Yongpeng Ma , Rui Zhao , Miaomiao Li , Xinrui Lei , Maiqi Sun , Yongchao Zhao , Gaihuan Ren , Jinping Jia
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引用次数: 0
摘要
过渡金属氧化物是活化过硫酸盐以降解有机物的最佳异相催化剂。本研究采用无溶剂熔融法成功制备了 MnCo2O4 尖晶石。通过电纺丝将 MnCo2O4 粉末催化剂成功固定在聚氨酯(PU)膜上,对其催化性能进行了系统研究,以评估其应用潜力。结果表明,当以 0.04 g L-1 罗丹明 B 为目标污染物时,MnCo2O4(0.1 g L-1)活化的过一硫酸盐(0.1 g L-1)在 10 分钟内的降解率达到 99.92%。大量氧空位的形成、Co 和 Mn 离子的协同效应以及高电子转移迁移率都有助于活性氧的产生。结合淬灭实验和时间分辨 EPR,提出了各种活性物种的贡献,其中 1O2 起主导作用。MnCo2O4-PU 膜活化 PMS 的流动反应对不同目标污染物具有普遍的降解作用。
Controllable preparation of MnCo2O4 spinel and catalytic persulfate activation in organic wastewater treatment: Experimental and immobilized evaluation
Transitional metal oxides are excellent candidates as heterogeneous catalysts for activating persulfate towards organics degradation. In this study, MnCo2O4 spinel was successfully prepared using a solvent-free molten method. The catalytic performance was systematically investigated and MnCo2O4 powder catalyst was successfully immobilized on polyurethane (PU) membrane through electrospinning to assess its application potential. The results showed that peroxymonosulfate (0.1 g L−1) activated by MnCo2O4 (0.1 g L−1) reached 99.92 % degradation in 10 min when treating 0.04 g L−1 rhodamine B as target pollutant. The abundant oxygen vacancies formation, synergistic effect of Co and Mn ions and high electron transfer mobility are contributing to production of reactive oxygen species. Combining with quenching experiment and time-resolved EPR, the contribution of various active species was proposed, of which 1O2 exhibited the dominant role. The flowing reaction run by the MnCo2O4-PU membrane activating PMS exhibited universal degradation on different target pollutants.
期刊介绍:
Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings.
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