Impact Factor:

9.0

DOI number:

10.26599/NR.2026.94908660.

Journal:

Nano Research

Key Words:

MOFs-based heterojunction NO removal Z-scheme ROS modulation NO2 inhibition

Abstract:

Fundamentally, the type-II and Z-scheme heterojunctions exhibit identical band alignments but diverge in the charge carriers transfer mechanisms. Here, we demonstrate that the Au-mediated heterojunction transition from type-II to Z-Scheme dictates the subsequent photocatalytic NO reaction pathway to obtain excellent activity and selectivity. As proven by density functional theory (DFT) calculations, Kelvin probe force microscopy (KPFM) and in-situ X-ray photoelectron spectroscopy (in-situ XPS), the type-II to Z-scheme heterojunction transition is regulated by incorporating Au nanoparticles as electron bridges within in-situ fabricated NH2-MIL-125/TiO2 through controllable hydrolysis. This transition maintains robust redox potentials to generate more reactive active species through effectively separated charge carriers under the high-efficient built-in electric field. As a result, the Z-scheme (NH2-MIL-125/Au/TiO2) exhibits an impressive 82.0% NO removal efficiency, surpassing the original NH2-MIL-125 by 3.7 times and the type-II (NH2-MIL-125/TiO2) by 1.2 times, while shows almost 100% selectivity toward NO2−/NO3−. The in-situ Fourier transform infrared (in-situ FT-IR) and DFT reveal that, in comparison with the type-II favored NO+ intermediates, the Z-scheme favors NO− intermediates with enhanced O2/H2O activation, enabling ideal Gibbs free energy for NO-to-NO3− conversion. This study achieves a metal-nanoparticle-mediated strategy for precisely engineering MOFs-based heterojunction architectures, which regulates the NO reaction pathways for efficient environmental purification.

Co-author:

Min Fu,HYZ,伍凯莉

Indexed by:

SCI

Correspondence Author:

LYH

Document Code:

94908660

Document Type:

Journal Article

ISSN No.:

1998-0124

Translation or Not:

no

Date of Publication:

2026-03-22

Included Journals:

SCI