Shahzad Ajmal, Ali Jawad, Ifthikar Jerosha, Aregay Gebremedhin G, Zhu Jingyi, Chen Zhulei, Chen Zhuqi
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
J Hazard Mater. 2020 Jun 15;392:122316. doi: 10.1016/j.jhazmat.2020.122316. Epub 2020 Feb 15.
A new strategy was applied by periodic stacking of active sites of Cu and reduced graphene oxide (rGO) in the form of Cu-rGO LDH nanohybrid material. The experimental results revealed that newly prepared Cu-rGO LDH nanohybrid material was extremely reactive in PMS activation as evident from the degradation rate of 0.115 min, much higher than Mn-rGO LDH (0.071 min), Zn-rGO LDH (0.023 min) or other benchmarked material used during the degradation of bisphenol A (BPA). This excellent activity of Cu-rGO LDH nanohybrid was attributed to the better PMS utilization efficiency as compared to the other catalysts. Additionally, the characterization techniques disclosed that the layer by layer arrangement of active sites in the Cu-rGO LDH catalyst promotes interfacial electron mobility owing to the synergistic association between Cu in LDH and interlayered rGO. Based on the in-situ electron paramagnetic resonance spectroscopy (EPR) and chemical scavengers, singlet oxygen (O) was unveiled as dominant reactive species for pollutant removal, resulting from the recombination of superoxides (O) or reduction of active Cu centers. We believe that this novel Cu-rGO LDH/PMS system will open up a new avenue to design efficient metal-carbon nanohybrid catalysts for the degradation of emerging aquatic pollutants in a real application.
一种新策略是通过将铜（Cu）和还原氧化石墨烯（rGO）的活性位点以Cu-rGO层状双氢氧化物（LDH）纳米杂化材料的形式进行周期性堆叠来应用。实验结果表明，新制备的Cu-rGO LDH纳米杂化材料在过一硫酸盐（PMS）活化方面具有极高的反应活性，从0.115分钟的降解速率可以明显看出，远高于Mn-rGO LDH（0.071分钟）、Zn-rGO LDH（0.023分钟）或在双酚A（BPA）降解过程中使用的其他基准材料。Cu-rGO LDH纳米杂化材料的这种优异活性归因于与其他催化剂相比更好的PMS利用效率。此外，表征技术表明，Cu-rGO LDH催化剂中活性位点的逐层排列由于LDH中的Cu与层间rGO之间的协同关联而促进了界面电子迁移。基于原位电子顺磁共振光谱（EPR）和化学清除剂，单线态氧（O）被揭示为污染物去除的主要活性物种，这是由超氧化物（O）的重组或活性Cu中心的还原产生的。我们相信，这种新型的Cu-rGO LDH/PMS系统将为设计高效的金属-碳纳米杂化催化剂以在实际应用中降解新兴的水生污染物开辟一条新途径。
