Magnetic Core–Shell-Structured FeO_x/CN Catalyst Mediated Peroxymonosulfate Activation for Degradation of 2,4-Dichlorophenol via Non-Radical Pathway

Abstract

In this study, a magnetic nano-FeO x /CN core–shell-structured catalyst with a high operating stability was successfully prepared by a coordinating polymer pyrolysis strategy. It exhibited high catalytic activity in peroxymonosulfate (PMS)-based advanced oxidation processes. Under neutral and room temperature conditions, the removal efficiency of 2,4-dichlorophenol (2,4-DCP) via FeO x /CN/PMS system reached more than 90% within 60 min, and the removal of total organic carbon reached 89% within 90 min. The key operating parameters were evaluated and analyzed. Besides, in five consecutive degradation experiments, Fe-3/CN showed high stability, low iron ion loss, and excellent magnetic separation and recovery performance, demonstrating its potential as a practical Fenton-like catalyst. The abundant and orderly N pores in the CN structure provided key conditions for the anchoring and dispersion of nano-FeO x particles. Electron paramagnetic resonance and free radical scavenging experiments proved that 1O2 is the main reactive oxygen species (ROS) that causes 2,4-DCP degradation (about 76.4% of the total contribution). Combined with density functional theory, the degradation pathway of 2,4-DCP was reasonably predicted. This study provides new ideas for the design and synthesis of Fenton-like catalysts with high stability and high activity.

Sn1/3Na2/3Sn(OH)6 Perovskite with Sn4+/Na+ Disorder for Photocatalytic Degradation of 2,4-Dichlorophenol

“…LC–MS was conducted to probe the photocatalytic intermediates (Figure S8). − As shown in Figure , we speculated that ·O 2 – can directly attack the benzene ring as the initial key step. Thus, 4-chlorophenol (4-CP) was formed owing to the leaving of a single Cl .…”

Revisiting the Heterogeneous Peroxymonosulfate Activation by MoS2: a Surface Mo–Peroxymonosulfate Complex as the Major Reactive Species

“…We then considered the possible contribution of O 2 •– and 1 O 2 for pollutant degradation, which has been commonly suggested in the PMS activation process. − Figure S4 in the Supporting Information shows that O 2 •– is not generated in the MoS 2 /PMS system because a characteristic absorbance peak at 560 nm should be expected when the NBT is used as an O 2 •– indictor if O 2 •– is generated . The fact that the NBT signal in MoS 2 /PMS is slightly weaker than that in pure solution should be due to the degradation of the NBT.…”

Role of Heteroatoms (N, P, O, and S) in Co3O4-Doped Carbons Derived from ZIF-67-Polyphosphazene Nanohybrids as Anode Materials for Supercapacitors

“…ZIF-67 displayed rhombic dodecahedral shapes with a smooth surface and a polyhedron size of approximately 194 nm (Figure 3a). A uniform coating of polymeric molecules 25 with a thickness of 24 nm was placed on the outside of ZIF-67 polyhedral MOF by the polymerization of hexachlorocyclophosphazene and 4,4sulfonydiphenol (Figure 3b). This resulted in the formation of a clearly visible border between ZIF-67 and the PZS layer, and As a result, this sample exhibited lower supercapacitance performance than its counterparts.…”