Tetracycline degradation by persulfate activated with magnetic Cu/CuFe2O4 composite: Efficiency, stability, mechanism and degradation pathway

Synthesis of Spinel Ferrite MFe2O4 (M = Co, Cu, Mn, and Zn) for Persulfate Activation to Remove Aqueous Organics: Effects of M-Site Metal and Synthetic Method

“…As shown in Figure 8A, all samples yielded Cu(II) 2p 3/2 peak at around 933.4 eV along with two satellite peaks at 941.3 and 943.8 eV (Lei et al, 2015). However, the surface of CuFe 2 O 4 -SG consisted uniquely of Cu(II); the surfaces of CuFe 2 O 4 -ST and CuFe 2 O 4 -CP also contained a small proportion of Cu(0) (the peak at 932.2 eV) (Li et al, 2019). The calculation of peak area showed that CuFe 2 O 4 -ST contained more surface Cu(0) than CuFe 2 O 4 -CP contained, which was in agreement with the diffraction peak intensities in the XRD patterns.…”

“…The calculation of peak area showed that CuFe 2 O 4 -ST contained more surface Cu(0) than CuFe 2 O 4 -CP contained, which was in agreement with the diffraction peak intensities in the XRD patterns. Figure 8B shows that Fe(III) (2p 3/2 712.2 eV, 2p 1/2 725.9 eV) and Fe(II) (2p 3/2 710.4 eV, 2p 1/2 723.8 eV) coexisted on the surface of the three CuFe 2 O 4 samples (Li et al, 2019;Zhang et al, 2019). Obviously, the proportion of Fe(II) in CuFe 2 O 4 -SG and CuFe 2 O 4 -CP was much higher than that in CuFe 2 O 4 -ST.…”

“…However, as the reaction proceeded, PS and AO7 gradually diffused into the pores of CuFe 2 O 4 -SG and reacted on the abundant active sites, ultimately leading to a better removal of AO7. Meanwhile, the corrosion and dissolution of the metallic Cu impurity observed on CuFe 2 O 4 -ST reduced the content of active metal and led to a gradual loss of activation ability of CuFe 2 O 4 -ST (Li et al, 2019). As for CuFe 2 O 4 -CP, its adsorption and catalytic capacity were greatly hindered owing to the serious sintering.…”

A facile heterogeneous system for persulfate activation by CuFe2O4 under LED light irradiation

“…(4)-(6)). [33][34][35] The generated reactive oxidant species reacted with RB, leading to the degradation process.…”

A Facile Fabrication of ZnFe2O4/Sepiolite Composite with Excellent Photocatalytic Performance on the Removal of Tetracycline Hydrochloride

“…Secondly, the ring-opening products (m/z 365, m/z 281 and m/z 218) were assigned as the further oxidation products. Carboxyl group was detached from the ringopening product (m/z 270) and then the intermediate product (m/z 140) was formed from the demethylation reaction (Pang et al, 2018;Li Z. et al, 2019.). Finally, these intermediate products were mineralized into CO 2 and H 2 O via ring-opening reactions (Wu et al, 2021.…”