Details

Autor(en) / Beteiligte

• Ma, Hongchao
• Xiaohui Lu
• Luo, Xinya
• Sun, Dedong
• Wang, Guowen
• Fu, Yinghuan

Titel

Constructing core-shell structured Co3O4–MnWO4 composite photoelectrode with superior PEC water purification performance

Ist Teil von

• Chemosphere (Oxford), 2024-04, Vol.354, p.141648-141648, Article 141648

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Semiconductor photoelectrocatalytic (PEC) technology is one of the most effective methods for removing organic pollutants from wastewater in advanced oxidation processes(AOPs). The selection of suitable semiconductor materials as photoanodes is a crucial factor for achieving superior PEC performance. Here, a core-shell structured Co3O4–MnWO4 architecture is created by enveloping MnWO4 nanoparticles onto the surface of Co3O4 nanowires through a two-step hydrothermal process. The optimized Co3O4–MnWO4-5 photoelectrode showed superior PEC degradation efficiency for KN-R (∼91.2% in 2 h) and durable stability (the accelerated lifetime reached ∼9100 s at a current density of 50 mA cm−2). Three actual wastewaters were also collected to verify the practical applicability of the photoelectrode.The energy consumption was measured at 4.48 kWhm−3, with a COD removal efficiency of 83% and a decolorization rate of 98%. These results demonstrate the excellent performance and promising application of the photoelectrode. The enhancement of PEC performance for the core-shell structured Co3O4–MnWO4 architecture can be attributed to the suitable energy band structure of the Co3O4–MnWO4 composite, higher OEP, larger electrochemical active surface area, accelerated transport of interface carriers, and lower charge transfer resistance. The energy band structure of the Co3O4–MnWO4 composite showed a strong redox ability to induce electrons/holes (e−/h+), which enhances the generation of intermediate active species (hydroxyl radical ·OH and superoxide radicals ·O2-). Therefore, the rationally designed core-shell structured Co3O4–MnWO4 architecture exhibited excellent practical applicability in the degradation of organic pollutants. [Display omitted] •Ti/Co3O4–MnWO4 composite photoanodes with one-dimensional core-shell structure were successfully prepared by a two-step hydrothermal method.•The prepared Ti/Co3O4–MnWO4 photoanodes have a larger active surface and increase the separation rate of electron/hole (e−/h+) pairs.•The Co3O4@MnWO4 composites have a strong redox capacity to promote the generation of hydroxyl radicals ·OH and superoxide radicals ·O2−.