Статья

Dual Charge Transfer Mechanisms in Intimately Bonded S‐scheme Heterojunction Photocatalyst with Expeditious Activity toward Environmental Remediation

Potlako J. MafaInstitute for Nanotechnology and Water Sustainability College of Science Engineering and Technology University of South Africa Florida Campus Johannesburg 1709 South AfricaMope E. MalefaneInstitute for Nanotechnology and Water Sustainability College of Science Engineering and Technology University of South Africa Florida Campus Johannesburg 1709 South AfricaFrancis OpokuDepartment of Chemistry Kwame Nkrumah University of Science and Technology Kumasi 00233 GhanaAdewale O. OladipoDepartment of Life and Consumer Sciences College of Agriculture and Environmental Sciences University of South Africa Private Bag X06 Florida Johannesburg 1709 South AfricaGcina MambaInstitute for Nanotechnology and Water Sustainability College of Science Engineering and Technology University of South Africa Florida Campus Johannesburg 1709 South AfricaTunde L. YusufDepartment of Chemistry Faculty of Natural and Agricultural Sciences University of Pretoria Hatfield Pretoria 0028 South AfricaJemal Fito NureSchool of Chemical and Metallurgical Engineering University of the Witwatersrand 1 Jorissen St Johannesburg 2000 South AfricaSogolo Lucky LebeloDepartment of Life and Consumer Sciences College of Agriculture and Environmental Sciences University of South Africa Private Bag X06 Florida Johannesburg 1709 South AfricaDan LiŭInstitute for Nanotechnology and Water Sustainability College of Science Engineering and Technology University of South Africa Florida Campus Johannesburg 1709 South AfricaJianzhou GuiInstitute for Nanotechnology and Water Sustainability College of Science Engineering and Technology University of South Africa Florida Campus Johannesburg 1709 South AfricaBhekie B. MambaInstitute for Nanotechnology and Water Sustainability College of Science Engineering and Technology University of South Africa Florida Campus Johannesburg 1709 South AfricaAlex T. KuvaregaInstitute for Nanotechnology and Water Sustainability College of Science Engineering and Technology University of South Africa Florida Campus Johannesburg 1709 South Africa

2025en

ABI

Аннотация

Abstract Fabrication of a photocatalyst with the desired characteristics of high charge isolation and expeditious photocatalytic performance is crucial in photocatalysis. Constructing an interfacial chemically bonded S‐scheme heterojunction is an effective path to the realization of high interfacial charge transfer and performance. Herein, Mg‐Bi 2 O 3 /dark gray g‐C 3 N 4 (MBOdCN) S‐scheme heterojunction with Bi‐N bond bridges is successfully constructed using an in situ calcination strategy for oxytetracycline (OTC) degradation. The MBOdCN (1:5) displays outstanding performance with efficiency and rate constant of 99.56% and 0.0235 min −1 , respectively. The synergy of n‐π* transition, Mg defects, and Bi–N bond bridges in the MBOdCN enhances the performance of the S‐scheme heterojunction. X‐ray photoelectron spectroscopy (XPS) analysis, work function measurements, and density functional theory (DFT) reveal the formation of MBOdCN S‐scheme heterojunction. In this system, trapping experiments and electron‐spin resonance (ESR) spectroscopy confirm the predominance of • O 2 − > h + > • OH during OTC degradation. The degradation pathways and byproducts are investigated with LC‐MS and the toxicity study is undertaken on the OTC degradation byproducts and photocatalytic materials. This work provides a holistic understanding of the novel S‐scheme heterojunction by introducing interfacial chemical bond bridges and defects as dual charge transfer channels.

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Идентификаторы

DOI: 10.1002/adsu.202401070

Цитирования и источники

Цитирований: 3Использованных источников: 0

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