假电容器
光催化
尾矿
材料科学
化学工程
氧化物
超级电容器
电化学
过氧化氢
核化学
无机化学
化学
冶金
催化作用
电极
生物化学
有机化学
物理化学
工程类
作者
L.B. Magnago,F.S. Betim,Jenifer Rigo Almeida,M.N. Moura,E.L.D. Coelho,V.M. Leal,Sandra Aparecida Duarte Ferreira,Maria de Fátima Fontes Lélis,Marcos. Freitas
标识
DOI:10.21577/0103-5053.20230184
摘要
In this study, a mixed oxide (SiO2/ZnO/Fe2O3/ZnFe2O4) was prepared using the anode recycled from alkaline batteries and the silt fraction of mining tailings and applied as a photocatalyst under solar irradiation and as a pseudocapacitor. The structure and morphology of the mixed oxide revealed clusters of nanometric particles with rhombic and octahedral shapes. A 23 full factorial design was performed to determine the effect of pH, hydrogen peroxide (H2O2), and photocatalyst on methylene blue (MB) decolorization. The maximum efficiency was 96%, obtained using 2.35 × 10−5 mol H2O2 and 20 mg of photocatalyst at pH 3 for 30 min under solar irradiation. This efficiency remained even after four successive decolorization cycles. Pseudocapacitive properties showed that the mixed oxide exhibited favorable characteristics for application as electrochemical pseudocapacitors due to its high capacitance (87.16 F g-1), energy density (27.24 Wh kg-1) at 524.41 W kg-1 of power density, and reversibility (93%). The studied mixed oxide has excellent potential for use in photocatalytic reactions and electrochemical devices, contributing to environmental sustainability and circular economy
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