非阻塞I/O
催化作用
材料科学
镍
化学工程
甲苯
纳米棒
氧化镍
煅烧
草酸
热液循环
氧气
无机化学
纳米技术
化学
冶金
有机化学
工程类
作者
Shujuan Zhan,Xianen Hu,Zhencheng Lou,Jinzhu Zhu,Ya Xiong,Shuanghong Tian
标识
DOI:10.1016/j.jallcom.2021.162160
摘要
In this work, defect-enriched NiO film-coated nickel foam ([email protected]) monolithic catalyst was prepared by an oxalic acid-assisting hydrothermal treatment without additional Ni sources and followed by a calcination treatment, which was then used as an ozonation monolithic catalyst for the first time. The formation mechanism and morphology control of NiO film, and the catalytic performance of [email protected] were systematically investigated. It is found that the film was assembled by randomly NiO nanorods under the best conditions of 0.001 mol/L of H2C2O4, 7 mg/L of dissolved oxygen (DO), as well as the hydrothermal temperature of 120 ℃ for 18 h. Particularly, the coupling effect of H2C2O4 and DO on the morphology of NiO film and the properties of [email protected] was revealed. Too low or too high DO would not result in a dense and complete NiO film and the absence of H2C2O4 only produced a film assembled by vertically-standing hexagonal NiO nanosheets with less vacancies (NiO nanosheets/NF). Due to the porous structure, rich defects of oxygen vacancies and undercoordinated Ni atoms, and the good redox ability, [email protected] presented excellent catalytic performance for ozonation of toluene (about 95% of toluene removal efficiency for 350 min and 74.0% of mineralization efficiency, 7 times the breakthrough time of NiO nanosheets/NF). This work shed a light on the design and preparation of NiO monolithic catalysts for ozonation of VOCs.
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