4.5 Article

Enhanced photocatalytic and photoelectrochemical performance of KBiFe2O5/g-C3N4 heterojunction photocatalyst under visible light

Journal

PHYSICA B-CONDENSED MATTER
Volume 648, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.physb.2022.414411

Keywords

Brownmillerites; Heterostructures; Photocatalysis; Photoelectrochemical

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The synthesis of a heterojunction photocatalyst based on graphitic carbon nitride (g-C3N4) and brownmillerite KBiFe2O5 (KBFO) is reported. The formation of heterojunction is confirmed and significant improvements are observed in degrading organic effluent.
Here we report the synthesis of graphitic carbon nitride (g-C3N4)/brownmillerite KBiFe2O5 (KBFO) based het-erojunction photocatalyst. The heterojunction composite revealed rod shaped KBFO embedded on the surface of g-C3N4. The distinct phases of individual compounds are revealed through X-ray diffraction. An effective reduction in bandgap energy of KBFO/g-C3N4 (KCN) composite in comparison to pristine g-C3N4 confirmed the formation of heterojunction. Photocatalytic performance of as developed heterostructures is tested and compared by degrading common organic effluent methylene blue (MB). 25 wt% of g-C3N4 content in KBFO sample shows a remarkable improvement (92% degradation efficiency) over pure KBFO (77%) and g-C3N4 (54%). The electrode composed of 25 wt% g-C3N4 content in KBFO also reveals significant photoelectrochemical response (0.3 mA/ cm2) over KBFO (1.5 mu A/cm2). The improvement was attributed to an effective electron-hole separation in the heterojunction. These stable and reusable KBFO/g-C3N4 heterostructures hold promising future materials for energy and environmental applications.

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