Preparation of Cu–Cu2O–CuO by solid combustion ignited by dielectric barrier discharge and its activity towards p-nitrophenol reduction

摘要: Cu–Cu2O–CuO samples were prepared by solid combustion ignited dielectric barrier discharge (DBD) plasma at room temperature and atmospheric pressure. The is proportionally composed of copper nitrate citric acid (φ = 0.5–2.0, which a ratio to nitrate). ignition primarily depends on the highly active species produced DBD rather than generated heat. water content in precursor key factor initiating because can produce more oxidizing discharge. XPS results show that all are three different valence coppers: Cu2+, Cu+, Cu0. XRD confirms main crystalline phase changed from Cu2O 0.5) Cu 0.75–1.0), then mixed CuO 1.5, 2.0). take spheres or flakes, respectively, form H3-type mesoporous. These showed high activities catalytic reduction p-nitrophenol using sodium borohydride as reducing agent. In addition, sample inducing muffle furnace (chemical method) shows completely physical crystal structures compared with DBD-prepared sample. differences nature due low properties its unique species. For φ 1.5 sample, activity for over was 6–7 times higher chemical method