催化作用
甲醛
氧气
化学工程
材料科学
化学
无机化学
核化学
有机化学
工程类
作者
Jiawei Ye,Min Wu,Bicheng Zhu,Bei Cheng,Jiaguo Yu
标识
DOI:10.1016/j.jhazmat.2024.134672
摘要
Room-temperature catalytic oxidation of formaldehyde (HCHO) has been extensively investigated due to its high efficiency, convenience, and environmental friendliness. Herein, nickel-iron layered double hydroxide (NiFe LDH) nanosheets were synthesized in-situ on a nickel foil (NF) using a facile one-step hydrothermal method, followed by the deposition of ultra-low content (0.069 wt%) of Pt nanoparticles through NaBH4 reduction. The resulting three-dimensional (3D) hierarchical Pt/NiFe-NF catalyst exhibited exceptional activity for the complete decomposition of formaldehyde to carbon dioxide (CO2) at room temperature (~95% conversion within 1 h), as well as remarkable cycling stability. The 3D porous structure of Pt/NiFe-NF provides fast transport channels for the diffusion of gas molecules, making the active catalyst surfaces more accessible. Moreover, abundant hydroxyl groups in NiFe LDH serve as adsorption centers for HCHO molecules to form dioxymethylene (DOM) and formate intermediates. Furthermore, electronic interactions between NiFe LDH and Pt enhance the adsorption and activation of O2 on Pt surfaces, leading to the complete decomposition of intermediates into non-toxic products. This work presents new insights into the design and preparation of Pt-based 3D hierarchical catalysts with surface-rich hydroxyl groups for the efficient removal of indoor HCHO. There has been an increasing demand for home offices, resulting in a greater emphasis on indoor air quality since the outbreak of the COVID-19 pandemic in 2019. Formaldehyde (HCHO) is the most prevalent volatile organic compound (VOC) in indoor environments. It is crucial to eliminate indoor formaldehyde due to its potential to cause irreversible health damage. Room-temperature catalytic decomposition stands out as a highly efficient and environmentally benign technique for indoor HCHO removal. We developed a 3D monolithic catalyst with excellent efficiency, stability, and practicability for catalytic oxidation of HCHO at ambient conditions, shedding light on indoor VOC decomposition.
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