Exciton Dissociation on Double Z‐scheme Heterojunction for Photocatalytic Application

Abstract

Constructing heterojunction is one of the promising approaches to obtain desired photocatalysts with enhanced photocatalytic activity. Herein, we have fabricated a Fe 2 O 3 -PrFeO 3 /g-C 3 N 4 ternary heterostructure by a simple wet chemical method to improve the photocatalytic activity of pristine g-C 3 N 4 . The as-prepared catalyst has shown 7.8 times higher photocatalytic degradation of dye acid violet 7 and generated 379.29 μmolL À 1 h À 1 of ammonia under visible-light irradiation.The ternary heterojunction was found to form a double Zscheme heterojunction that facilitates interfacial electron transfer, promotes the separation of photogenerated charge carriers, and also enhances light harvesting property. The enhanced photocatalytic performance of the catalyst is ascribed to the formation of double Z-scheme heterojunction, which offers low charge transfer resistance thereby lowering the recombination of photoexcitons and increasing the lifetime of photoexcitons.

Synthesis of double Z-scheme CdS/Bi2O2CO3/BiOCl heterojunction photocatalysts for degradation of rhodamine B under visible light

“…But the VB of CdS is more negative than that of H 2 O/·OH (2.38 eV vs. NHE), so h + cannot oxidize H 2 O to produce ·OH. 58,59 Therefore, the traditional type II heterojunction mechanism is inconsistent with the ESR and radical capture experimental results reported in this work.…”

Recent progress on van der Waals heterojunctions applied in photocatalysis

“…45 This effectively improves the shortcomings of a semiconductor photocatalyst, such as narrow photoresponse range, low quantum efficiency and too few active centers. [46][47][48] Therefore, the construction of heterojunction structures is an excellent strategy for improving the efficiency of photocatalysis.…”

Recent advancements of g-C3N4-based magnetic photocatalysts towards the degradation of organic pollutants: a review

“…In another study, α-Fe 2 O 3 /g-C 3 N 4 composite (∼0.5 wt%) is prepared by a facile hydrothermal method which displays higher photocatalytic activity for the reduction of Cr(VI) than pure g-C 3 N 4 and α-Fe 2 O 3 [130]. The α-Fe 2 O 3 NPs are dispersed on the surface of g-C 3 N 4 , and no aggregation is observed by Xiao et al Table 1 summarizes [143][144][145][146][147][148][149][150][151][152][153][154][155][156][157][158][159] several preparation methods of α-Fe 2 O 3 /g-C 3 N 4 composites and their uses as photocatalysts.…”