Z-scheme S, B co-doped g-C3N4 nanotube@MnO2 heterojunction with visible-light-responsive for enhanced photodegradation of diclofenac by peroxymonosulfate activation
, Thuy Giang Nguyen, , , , , , Sep-2022, In: Chemical Engineering Journal, 452, p. 139249
Overview
Abstract:
In this study, the manganese dioxide (MnO2) nanosheets were successfully embedded onto boron and sulfur codoped
g-C3N4 (CNBS) nanotubes to construct the flower-like core–shell CNBS@MnO2 heterojunction with Zscheme
structure for the enhanced photodegradation of diclofenac (DCF) in the presence of peroxymonosulfate
(PMS) and 460-nm visible light. The CNBS@MnO2 provides large specific surface area and reduced interfacial
resistance for rapid electron transport. Moreover, the redox cycling of Mn species effectively activates PMS to
produce sulfate radicals for DCF photodegradation. The PMS-based photodegradation of DCF over CNBS@MnO2
displays the excellent photodegradation performance after 15 min of irradiation, and the efficiency is highly
dependent on initial pH, ion species, and concentrations of PMS and DCF. The CNBS@MnO2 also shows its
excellent stability and reusability over ten cycles. Besides, h+, O2●???? and SO4●???? are the dominantly reactive species
for the enhanced degradation of DCF over Z-scheme CNBS@MnO2 heterojunction. The possible reaction
mechanism as well as the degradation pathway of DCF over CNBS@MnO2 in the presence of PMS is also proposed.
Results clearly highlight the superior photoactivity of Z-scheme CNBS@MnO2 toward micropollutant
degradation by PMS activation, which can open an avenue to fabricate the g-C3N4 nanotube@metal oxide
structure as an effective activator for water and wastewater purification.
Keyword(s): B, S-codoped g-C3N4 (CNBS); CNBS@MnO2; Z-scheme heterojunction; Peroxymonosulfate (PMS); Core–shell nanocomposites
| Article number | 139249 |
| Journal | Chemical Engineering Journal |
| Volume | 452 |
| Publication status | Published - Sep-2022 |
| ISBN | 1873-3212 |