Construction of p-n heterojunction film of Cu2 O/α-Fe2 O3 for efficiently photoelectrocatalytic degradation of oxytetracycline

Journal of Colloid and Interface Science
Ling ChengJingdong Zhang

Abstract

A p-n heterojunction film of Cu2O/α-Fe2O3 was constructed by electrodepositing p-type Cu2O microcubes on liquid phase deposited film of n-type α-Fe2O3. The surface morphology, the crystal phase and composition of Cu2O/α-Fe2O3 heterojunction film were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The enhanced absorption in the visible light region was observed in UV-visible diffuse reflectance spectra. Meanwhile, an efficiently improved separation and faster transfer of photogenerated electrons and holes were revealed by photoluminescence spectra and electrochemical impedance spectra. The Cu2O/α-Fe2O3 p-n heterojunction was applied to photoelectrocatalytic degradation of oxytetracycline at a bias potential of +0.5 V under visible light illumination. After 60-min photoelectrocatalytic treatment, 73.3% of oxytetracycline was removed and the degradation rate constant reached 2.14 × 10-2 min-1. Moreover, the crystal phases and compositions for the used and fresh Cu2O/α-Fe2O3 films were studied, and a possible photoelectrocatalytic mechanism was proposed.

Citations

Oct 3, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Sami DursunHasan Akyildiz
Aug 28, 2019·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Duo PanZhanhu Guo
Sep 14, 2019·Nanomaterials·Haitao LiYongxiang Zhao
Dec 21, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Atul VermaYen-Pei Fu

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