Fabrication of g‐C₃N₄/Bi₄O₅Br₂ 2D Nanosheet Photocatalyst for Removal of Organic Pollutants under Visible Light Irradiation

Abstract

The g-C 3 N 4 /Bi 4 O 5 Br 2 photocatalyst was successfully prepared by a facile hydrothermal method for the degradation of organic pollutants under visible light. The structure of the catalyst is a two-dimensional (2D) nanosheet structure with a high specific surface area, which provides more active sites. The heterojunction structure of g-C 3 N 4 /Bi 4 O 5 Br 2 can narrow the bandgap and thus increase the visible light absorption. The heterojunction formed by g-C 3 N 4 and Bi 4 O 5 Br 2 can facilitate the separation and transfer of photogenerated electrons and holes (e À À h + ). The degradation efficiencies of g-C 3 N 4 /Bi 4 O 5 Br 2 prepared under the optimal conditions are higher than 93.1 % for ciprofloxacin (CIP), rhodamine B (Rh B), and methylene blue (MB) under visible light. The results of the trapping experiment indicate that h + and * O 2 À contribute greatly to the removal of organic pollutants. Furthermore, the feasible mechanism of g-C 3 N 4 / Bi 4 O 5 Br 2 to degrade organic pollutants is proposed.

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

“…However, when the catalyst content increased to 1.5 g L −1 , the degradation efficiency decreased, because the excessive photocatalyst blocked the absorption of visible light, so the carrier separation efficiency decreased. 55 Therefore, the selection of an appropriate amount of photocatalyst is more favourable to accelerating the photodegradation process.…”

2D/2D Z-scheme WO3/g-C3N4 heterojunctions for photocatalytic organic pollutant degradation and nitrogen fixation

“…1–4 Among the visible-light catalytic materials, WO 3 and g-C 3 N 4 photocatalytic materials have the advantages of a suitable energy band structure, good visible-light response range, and relatively simple preparation process. 5–7 Therefore, WO 3 and g-C 3 N 4 are ideal materials for constructing efficient visible-light catalysts. Furthermore, if the two materials are integrated to construct type-II or Z -scheme heterojunctions, the electrons (e − ) and holes (h + ) can be physically separated, favoring the redox reaction.…”