Yun Yupan, Wen Xueyou, Liang Zhao, Zhu Zhenya
School of Water Resources and Environment, Institute of Intelligence and Environment industry Technology, Hebei Province Collaborative Innovation Center for Sustainable Utilization of Water Resources and Optimization of Industrial Structure, Hebei Province Key Laboratory of Sustained Utilization and Development of Water Resources, Hebei GEO University, Shijiazhuang, Hebei, China.
College of ecological health, Hangzhou Vocational & Technical College, Hangzhou, China.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2021;56(5):501-507. doi: 10.1080/10934529.2021.1890496. Epub 2021 Feb 27.
The focus of this research was on the catalytic reduction of nitrate to nitrogen gas for the water conservation. Zero-valent iron (Fe) with bimetallic catalyst that carrier supported palladium (Pd) and copper (Cu) was innovatively applied in this study. First, XPS (X-ray photoelectron spectroscopy) analyses and experiments were conducted to study the mechanism of the catalytic reduction of nitrate. In the catalytic reaction, which is regarded as a stepwise process, Fe was the electron provider; Pd and Cu supported on carrier played indispensable but distinct roles. The kinetics suggested that the process was better reflected by first-order kinetics of the Langmuir-Hinshelwood model. Additionally, first-order kinetics of the catalytic reaction under the effect of catalysts with different carriers (SiO, silica gel, kaolin, diatomite, γ-AlO, graphene) were further studied. Pd-Cu/graphene catalyst showed higher catalytic performance compared with other catalysts.
本研究的重点是通过将硝酸盐催化还原为氮气来实现水资源保护。本研究创新性地应用了负载钯（Pd）和铜（Cu）的双金属催化剂的零价铁（Fe）。首先，进行了X射线光电子能谱（XPS）分析和实验，以研究硝酸盐催化还原的机理。在被视为分步过程的催化反应中，Fe是电子供体；负载在载体上的Pd和Cu发挥了不可或缺但又不同的作用。动力学研究表明，该过程用Langmuir-Hinshelwood模型的一级动力学能更好地反映。此外，还进一步研究了不同载体（SiO、硅胶、高岭土、硅藻土、γ-AlO、石墨烯）的催化剂作用下催化反应的一级动力学。与其他催化剂相比，Pd-Cu/石墨烯催化剂表现出更高的催化性能。
