College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, PR China.
J Hazard Mater. 2019 Dec 15;380:120864. doi: 10.1016/j.jhazmat.2019.120864. Epub 2019 Jul 4.
In this study, four kinds of porous carbon materials were used as supports to anchor gold nanoparticles (AuNPs) for catalytic reduction of nitroaromatics and 4-nitrophenol (4-NP) was employed as a model material. Results identified that carbon black (CB) restricted-Au catalyst (Au/CB) provided large specific surface area, small AuNPs size, and low cost, which showed highly catalytic activity for 4-NP reduction. Besides, with the increase of Au loadings, the catalytic activity of Au/CB was enhanced and the 1.2 wt% of Au loading exhibited the best catalytic activity with the high rate of 0.8302 min and the turnover frequency of 492.50 h. Universality and real water application demonstrated that the as-prepared Au/CB catalyst was promising candidate for other phenols and azo dyes reduction and had great potential for practical application. Furthermore, after ten cycles, Au/CB still retained satisfying stability and activity. These results suggested that the larger specific surface area and smaller particle size attributing to the porosity of CB were conducive to improving the catalytic activity of Au catalysts. This design shows high potential of hierarchical porous carbon materials for highly catalytic reaction in many fields, especially the water purification.
在这项研究中，使用了四种多孔碳材料作为载体来固定金纳米粒子（AuNPs），用于催化还原硝基芳烃和 4-硝基苯酚（4-NP），4-NP 被用作模型材料。结果表明，炭黑（CB）限制 Au 催化剂（Au/CB）提供了大的比表面积、小的 AuNPs 尺寸和低成本，对 4-NP 还原表现出很高的催化活性。此外，随着 Au 负载量的增加，Au/CB 的催化活性增强，1.2wt%的 Au 负载量表现出最好的催化活性，速率高达 0.8302min 和 492.50h 的转化频率。通用性和实际水应用表明，所制备的 Au/CB 催化剂是其他酚类和偶氮染料还原的有前途的候选者，具有很大的实际应用潜力。此外，经过十次循环后，Au/CB 仍保持令人满意的稳定性和活性。这些结果表明，较大的比表面积和较小的颗粒尺寸归因于 CB 的多孔性，有利于提高 Au 催化剂的催化活性。该设计表明，分层多孔碳材料在许多领域，特别是水净化中的高催化反应具有很高的潜力。
