High degradation efficiency of sulfamethazine with the dual-reaction-center Fe–Mn–SiO₂ Fenton-like nanocatalyst in a wide pH range

Abstract

The development of a heterogeneous Fenton-like catalyst, possessing high degradation efficiency in a wide pH range, is crucial for wastewater treatment. The Fe-Mn-SiO2 catalyst was designed, and prepared by a...

Reconstructing atomic Fe coordination in the PMS activation process to realize efficient BPA degradation at low temperature

“…HCO 3 − , a scavenger of 1 O 2 , inhibited BPA degradation in the reaction, consistent with the literature. 57 Cl − addition slightly enhanced BPA degradation, owing to a Cl˙ intermediate produced via reaction with trace amounts of SO 4 ˙ − . 56 The influence of SO 4 2− on pollutant degradation was negligible.…”

Enhanced Heterogeneous Fenton-like Process for Sulfamethazine Removal via Dual-Reaction-Center Fe-Mo/rGO Catalyst

“…The initial reaction rate of the Fe-Mo/rGO catalyst was ca. 32 times higher than that of the Fe-Mn-SiO 2 catalyst at similar operating conditions (pH = 6.5–7.0, 25 °C) [ 26 ]. Moreover, the initial reaction rates of the Fe 3 O 4 -Mn 3 O 4 , Fe 3 O 4 -Mn 3 O 4 /rGO, and Fe 3 O 4 /MWCNTs catalysts under the acidic operating conditions were significantly inferior to that of the Fe-Mo/rGO catalyst near neutral pH value [ 2 , 23 , 27 ].…”

“…The intensity of ·O 2 − /HO 2 · signal was obviously higher than that of 1 O 2 and ·OH signals, which is inconsistent with the result of radical quenching experiments. These results indicated that ·O 2 − /HO 2 · and 1 O 2 played the decisive roles in the reaction for degrading SMT over the Fe-Mo/rGO catalyst [ 26 ]. In addition, the ESR signal intensities of generated 1 O 2 and ·O 2 − /HO 2 · were compared in the Fenton-like reaction for the SMT degradation over rGO, Fe/rGO, Mo/rGO, and Fe-Mo/rGO catalysts.…”

A potential link between the structure of iron catalysts and Fenton-like performance: from fundamental understanding to engineering design

“…This unique electron structure thus facilitated H 2 O 2 activation and reactive species generation. 66 Meanwhile, the nonuniform distribution of surface electrons caused by doping metal ions with lower oxidation states may also result in the generation of oxygen vacancies, ascribed to charge compensation effects. 67,68 For example, Soltani et al reported that the oxygen vacancy concentration increased when increasing the doping amount of Ba in Bi 1Àx Ba x FeO 3 , and the mechanism was related to the neutralization of charges produced by lowervalence Ba 2+ substituting Bi 3+ .…”