Boosted adsorption and oxidation performances in peroxymonosulfate (PMS)-based heterogeneous fenton-like reactions via P, N co-doping strategy

• Published in: Separation and purification technology Vol. 354; p. 128587
• Main Authors: Song, Yunan, Feng, Yizhou, Wu, Ting, Yang, Rui, Shi, Qiyu, Yi, Zhou, Li, Zhihua, Zhu, Weihuang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 19.02.2025
• Subjects: Heterogeneous Fenton-like reactions (HTFR); Mn-based catalysts; P, N co-doping; Peroxymonosulfate (PMS) activation; Synergistic adsorption-catalytic process; Heterogeneous Fenton-like reactions (HTFR); P, N co-doping; Mn-based catalysts; Peroxymonosulfate (PMS) activation; Synergistic adsorption-catalytic process
• ISSN: 1383-5866
• DOI: 10.1016/j.seppur.2024.128587

[Display omitted] •Mn@5-NPC-800 was applied in heterogeneous Fenton-like reaction (HTFR).•HTFR performance was enhanced via the synergistic adsorption and oxidation process.•P, N co-doping enhanced the specific surface area, yields of MnIII and graphitic-N.•N, P co-doped carbon matrix facilitated electron transfer between MnP and PMS.•O2•− and 1O2 were the main generated ROS, contributing to the pollutant removal. The heterogeneous Fenton-like reactions (HTFR) have attracted considerable interest for their efficacy in degrading pollutants. However, the development of effective strategies for enhancing performance in HTFR remains a subject of ongoing research. Herein, a synergistic adsorption and oxidation-dominated process was developed to overcome the bottlenecks of peroxymonosulfate (PMS)-based HTFR in terms of mass transfer and catalyst reactivity. Heteroatom (P, N) co-doping for manganese (Mn) was employed to fabricate an efficient catalyst, Mn@5-NPC-800, which exhibited exceptional abilities of adsorption and PMS activation. The enhanced performance of HTFR was attributed to the increased specific surface area (SSA) and enhanced yields of graphitic-N/MnIII of the catalyst, which facilitated reactant enrichment and electron transfer in the delocalized conjugated area, respectively. The PMS-based HTFR induced by Mn@5-NPC-800 for pollutant removal was characterized by a synergistic adsorption and reactive oxygen species (ROS)-dominated oxidation process. DFT calculations revealed that the N, P co-doped carbon matrix (NPC) acted as a conductive bridge, significantly improving electron transfer between MnP and PMS molecule, which was identified as a key factor in governing the catalytic performance. The investigation presents a suggestive example of employing a doping strategy to create a synergistic effect of adsorption and oxidation, thereby strengthening the performance of Fenton-like reactions.