Herein, we present a template- and surfactant-free electrochemical method for the fabrication of hierarchical porous CeO2 NWs and NWAs. These porous NWs/NWAs have diameters of 50–200 nm and lengths of up to several micrometres. Both the NWs and NWAs exhibit an excellent ability to remove Congo red in wastewater treatment.
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Lu et al. (2010) studied this question.
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