Peroxymonosulfate activation for efficient sulfamethoxazole degradation by Fe3O4/β-FeOOH nanocomposites: Coexistence of radical and non-radical reactions

Degradation of methylene blue with magnetic Co-doped Fe3O4@FeOOH nanocomposites as heterogeneous catalysts of peroxymonosulfate

“…The possible heterogeneous reaction mechanism of Co-doped Fe 3 O 4 @FeOOH for activating PMS could be proposed based on all the previous research and the above-mentioned experimental results. 32 When the catalyst was added into the untreated solution, MB was rst adsorbed on the surface of the composite material. was converted to TM 2+ (eqn (15) and (16)).…”

“…43,44 In addition, eqn (17) and (18) explain the quenching process of SO 4 À c and the generation of $OH. 32,45 Co 2+ and Fe 2+ both can be regenerated according to eqn (11) and (13) As discussed before, the reaction rate of the system can increase with the increased pH; this is because SO 4 À c can react with hydrone and hydroxide to produce $OHSO 4 À c$OH, which has a higher oxidation-reduction potential (2.80 eV). The radicals SO 4 À c and $OH played crucial roles in the degradation of MB based on the radical quenching experiment.…”

“…A macromolecular structure (TM 3+ -$OHOSO 3 ) was further formed on the surface of the catalyst. 14,32,[43][44][45] The electron transfer activity between cobalt ions and iron ions provided a certain number of electrons to PMS, and the O-O bond in PMS fractured and generated SO 4 À c and $OH. Finally, MB was degraded by SO 4 À c and $OH (eqn (22)).…”

A novel carbon nanotube–magnesium oxide composite with excellent recyclability to efficiently activate peroxymonosulfate for Rhodamine B degradation

“…The experimental phenomena show that PMS concentration is the key factor to limit the reaction rate. On the one hand, the active sites on the surface of the catalyst are not effectively utilized at low PMS concentrations, and the use of active sites tends to be saturated with the increase of PMS concentration [38]. The growth region of k obs of RhB degradation keeps wider, which can indirectly prove that the catalyst has stronger activation performance.…”

Assessment of Sulfate Radical-Based Advanced Oxidation Processes for Water and Wastewater Treatment: A Review

“…Heterogeneous catalysis presents a solution to these drawbacks since they are easier to recover, and it is not necessary to carry out subsequent treatment to remove metals from the water. Moreover, in many cases it can be reused, thus lengthening its useful life and decreasing the cost of the treatments [80,81]. In addition, they are much more stable under different conditions, being able to operate in a wide range of pH [37,82,83].…”