气态污染物如二氧化硫和氮氧化物(S)(SO2,NOx)在过去的二十年中呈指数级增长,对人类健康有不良影响,水生生物,和环境。最近,为了抑制空气污染,锰/氧化物(Mn/MnO)因其环境友好,价格低廉,和对有毒气体的显著催化能力。在这项工作中,通过溶剂热法将立方体形的Mn纳米颗粒(cMnNP)装饰在还原的氧化石墨烯(rGO)的表面上。将所得的cMn@rGO复合材料用于电化学NOx还原。然而,微观(TEM/HRTEM)和结构分析用于研究cMn@rGO复合材料的形态和特征。通过使用电子穿梭或氧化还原介体来采用这种基于电化学的NOx还原处理。这里,四种不同的氧化还原介体用于解决电化学障碍,能有效促进电极表面的电子传输和促进NOx还原。这些介体不仅显著提高了NOx转化为有价值的产品,即,N2和N2O,但也使过程顺利与高性能。在这些调解员中,中性红(N.R)在增强NOx还原方面表现出非凡的潜力。得到的结果表明,cMn@rGO的显着催化性能(〜93%)可以归因于几个因素,包括催化剂的三维结构和丰富的活性位点。设计的催化剂(cMn@rGO)不仅具有成本效益和可持续性,而且在有效减少NOx方面表现出优异的潜力,这可能有利于大规模减少NOx。
Gaseous pollutants like sulfur dioxide and nitrogen oxide(s) (SO2, NOx) have been increasing exponentially for the last two decades, which have had adverse effects on human health, aquatic life, and the environment. Recently, for air pollution taming, manganese/oxide (Mn/MnO) has become a very promising heterogeneous catalyst due to its environment-friendly, low-price, and remarkable catalytic abilities for toxic gases. In this work, cube-shaped Mn nanoparticles (cMn NPs) were decorated on the surface of reduced graphene oxide (rGO) by the solvothermal method. The resulting cMn@rGO composite was employed for electrochemical NOx reduction. However, the microscopic (TEM/HRTEM) and structural analysis were utilised to investigate the morphology and characteristics of the cMn@rGO composite. This electrochemical-based treatment for NOx reduction is employed by using electron shuttle or redox mediators. Here, four distinct redox mediators are used to address electrochemical obstacles, which effectively facilitate electron transportation and promoted NOx reduction on the electrode surface. These mediators not only significantly enhanced the NOx conversion into valuable products, i.e., N2 and N2O, but also made the process smooth with high performance. Among these mediators, neutral red (N.R) exhibited extraordinary potential in enhancing NOx reduction. The obtained results indicated that the remarkable catalytic performance (∼93%) of the cMn@rGO can be attributed to several factors, including the catalyst\'s three-dimensional architecture structure and abundant active sites. The designed catalyst (cMn@rGO) is not only cost-effective and sustainable but also exhibits excellent potential in effectively reducing NOx, which could be beneficial for large-scale NOx abatement.