Efficient Removal of Organic Pollutants by Metal–organic Framework Derived Co/C Yolk–Shell Nanoreactors: Size-Exclusion and Confinement Effect

作者：Ming Zhang, Chengming Xiao, Xin Yan, Saisai Chen, Chaohai Wang, Rui Luo, Junwen Qi, Xiuyun Sun, Lianjun Wang, Jiansheng Li · 发表于：Environmental Science & Technology · 年份：2020 · DOI：10.1021/acs.est.0c00914 · 被引用次数：357 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Catalytic Processes in Materials Science、Adsorption and biosorption for pollutant removal

Selective removal of organic pollutants from surface water with high efficiency is crucial in water purification. Here, yolk–shell Co/C nanoreactors (YSCCNs) are facilely synthesized via pyrolysis of controllably etched ZIF-67 by tannic acid, and their degradation performance on multiple pollutants is demonstrated. To present the structure–performance relationship between the designed nanocatalyst and the selective removal of organic pollutants, bisphenol A (BPA) was selected as the targeted pollutant with coexistence of humus acid (HA). For comparison, solid and hollow ZIF-67 derived Co/C nanoparticles denoted as SCCNs and HCCNs, were also tested. The results show that YSCCNs exhibit enhanced BPA degradation rate of 0.32 min –1, which is 23.1% and 45.4% higher than that of HCCNs and SCCNs in HA (10 ppm) system. The essential improvement can be ascribed to the synergetic effects from shell layer (size-exclusion) and core/shell (confinement effect). The degradation mechanism and pathway are further confirmed by radical quenching experiments and liquid chromatography–mass spectrograph (LC–MS), respectively. In addition, some influential factors, including reaction temperature, pH value, and peroxymonosulfate (PMS) dosage are investigated in detail. This work provides a possible way to selectively remove target contaminant from multiple pollutants in complex water system.