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Issue 36, 2019
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Template free mild hydrothermal synthesis of core–shell Cu2O(Cu)@CuO visible light photocatalysts for N-acetyl-para-aminophenol degradation

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Abstract

Solar photocatalytic processes are a promising approach to environmental remediation, however their implementation requires improvements in visible light harvesting and conversion and a focus on low cost, Earth abundant materials. Semiconducting copper oxides are promising visible light photocatalysts for solar fuels and wastewater depollution. Here we report the mild, hydrothermal (template-free) synthesis of core–shell Cu2O(Cu)@CuO photocatalytic architectures for the visible light photocatalytic degradation of N-acetyl-para-aminophenol (APAP). Hollow and rattle-like core–shell nanosphere aggregates with diameters between 200 nm and 2.5 μm formed under different synthesis conditions; all comprised an inner Cu2O shell, formed of 10–50 nm nanoparticles, surrounded by a protective corona of CuO nanoparticles. High reductant and structure-directing agent concentrations promoted the formation of a yolk-like Cu2O/Cu core, associated with improved photophysical properties, notably a high oxidation potential and suppressed charge carrier recombination, that correlated with the highest apparent quantum efficiency (8%) and rate of APAP removal (7 μmol g−1 min−1). Trapping experiments demonstrated hydroxyl radicals were the primary active species responsible for APAP oxidation to quinones and short chain carboxylic acids. Rattle-like core–shell Cu2O/Cu@CuO nanospheres exhibited excellent physiochemical stability and recyclability for APAP photocatalytic degradation.

Graphical abstract: Template free mild hydrothermal synthesis of core–shell Cu2O(Cu)@CuO visible light photocatalysts for N-acetyl-para-aminophenol degradation

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Supplementary files

Article information


Submitted
30 Jun 2019
Accepted
15 Aug 2019
First published
19 Aug 2019

J. Mater. Chem. A, 2019,7, 20767-20777
Article type
Paper

Template free mild hydrothermal synthesis of core–shell Cu2O(Cu)@CuO visible light photocatalysts for N-acetyl-para-aminophenol degradation

S. Karthikeyan, C. Chuaicham, R. R. Pawar, K. Sasaki, W. Li, A. F. Lee and K. Wilson, J. Mater. Chem. A, 2019, 7, 20767
DOI: 10.1039/C9TA07009E

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