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Electrochemical synthesis of copper(II) oxide nanorods and their application in photocatalytic reactions
摘要： A new way of synthesizing nanoscale copper oxide particles is described in this work. Oxides of an intermediate metal, such as copper oxide, can be used as an effective semiconductor in the photocatalytic reactions once they are prepared in a special way. The CuO nanorods were synthesized electrochemically under surfactant-free, static conditions. The obtained nanorods have an average length of less than 50 nm. The CuO nanorods were used as a heterogeneous catalyst in an aqueous medium. 2,4-Dichlorophenol (DCP) was used as a probe molecule. The CuO nanorods showed an excellent ability to degrade DCP under visible light and without the need for any auxiliary oxidizing agent.
关键词： CuO,DCP,Visible light,Degradation,Nanorods,Heterogeneous catalyst
更新于2025-09-23 15:22:29
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Synthesis of Au-decorated three-phase-mixed TiO <sub/>2</sub> /phosphate modified active carbon nanocomposites as easily-recycled efficient photocatalysts for degrading high-concentration 2,4-DCP
摘要： It is of great significance to fabricate easily-recycled TiO2 photocatalysts with high activity. Herein, dominant-anatase three-phase (anatase/rutile/brookite)-mixed nanosized TiO2 with high photocatalytic activity for degrading a high-concentration of 2,4-DCP has been synthesized via a hydrothermal process with HCl as a phase-directing agent, and interestingly the apparent photoactivity could be greatly improved by decorating Au nanoparticles and then coupling phosphate-treated active carbon. The amount-optimized nanocomposite displays (cid:1)12-fold enhancement in degradation rate constant (k) compared to anatase TiO2. Based on the steady-state surface photovoltage spectra, fluorescence spectra related to the produced $OH amount, temperature-programmed desorption and O2 electrochemical reduction curves, it is confirmed that the exceptional photoactivity is mainly attributed to the greatly-enhanced charge separation from the phase-mixed composition, and from the decorated Au as electron acceptors and its promotion effects on O2 activation. Moreover, the use of phosphate-modified AC as a support is also positive for efficient photocatalytic reactions by accepting electrons and concentrating the pollutants, with recyclable features. This work provides a feasible strategy to fabricate TiO2-based nano-photocatalysts for degrading high-concentration pollutants to remediate the environment.
关键词： 2,4-DCP degradation,photocatalysts,Au nanoparticles,TiO2,active carbon
更新于2025-09-16 10:30:52