Regulating Lewis Acid-Base Sites over Fenton System for Enhancing Degradation of Pollutants in Saline and Buffered Wastewater

Abstract

The saline and buffered environment in actual wastewater imposes higher demands on Fenton and Fenton-like catalytic systems. This study developed a MoS ₂ co-catalytic Fe ₂O ₃ Fenton-like system with controllable Lewis acid-base sites, achieving efficient treatment of various model pollutants and actual industrial wastewater under neutral buffered environment. The acidic microenvironment structured by the edge S sites (Lewis basic sites) in the MoS ₂/Fe ₂O ₃ catalyst is susceptible to the influence of Lewis acidic sites constructed by Mo and Fe element, affecting catalytic performance. Optimizing the ratio of precursor amounts ensures the stable presence of the acidic microenvironment on the surface of catalyst, enabling the beneficial co-catalytic effect of Mo sites to be realized. Furthermore, it transcends the rigid constraints imposed by the Fenton reaction on reaction environments, thereby expanding the applicability of commonplace oxides such as Fe ₂O ₃ in actual industrial water remediation.

Keywords

Fenton / MoS ₂ / Fe ₂O ₃ / Lewis acid-base sites / Acidic microenvironment / Iron cycle / Degradation / Wastewater

RIGHTS & PERMISSIONS

2024 SIOC, CAS, Shanghai, & WILEY-VCH GmbH