Efficient peroxymonosulfate activation by CoFe2O4-CeO2 composite: Performance and catalytic mechanism

Currently, photo-assisted peroxymonosulfate (PMS) activation has received more and more attention in the degradation of wastewater pollutants. In this paper, the Fe3O4@CQDs magnetic nanocatalyst was successfully prepared by modifying α-Fe2O3, and Rhodamine B (RhB) was degraded by activating PMS under visible light. Moreover, in order to explore the reason why Fe3O4@CQDs was more beneficial to the activation of PMS than α-Fe2O3 at the microscopic level and reaction mechanism, the corresponding DFT calculations were performed. The results revealed that the degradation efficiency of RhB reached 98% in 35 min. Subsequently, the quenching experiments and EPR tests jointly verified that SO4•-, •OH, O2•- free radical pathway and 1O2, h+ non-free radical pathway participated in the degradation of RhB in the Fe3O4@CQDs + PMS + light system. The adsorption energy reached −5.247 eV with Fe3O4@CQDs adsorbed PMS by DFT calculation. The electron enrichment and charge redistribution can be apparently observed during the adsorption of PMS at Fe3O4@CQDs nanocatalyst. It was confirmed that the embedding of CQDs effectively regulated the electron transfer efficiency at the Fe3O4@CQDs interface to promote the improvement of electrical conductivity. It was more conducive to forming Fe(Ⅲ) to Fe(Ⅱ) cycles, and then the ability of the catalyst to activate PMS was improved. 

Peroxymonosulfate (PMS) activated by magnetic Fe3O4 doped carbon quantum dots (CQDs) for degradation of Rhodamine B (RhB) under visible light: DFT calculations and mechanism analysis

Persulfate activation of CuS@Ti3C2-based MXene with Bi-active centers toward Orange II removal under visible light

Designing efficient heterogeneous electro-Fenton (HEF) catalysts for in-situ H2O2 generation and organic pollutant degradation in water has become a hot research topic. In this study, a series of novel UiO-66-SO3H/Fe(x)-800 materials were successfully prepared by carbonizing sulfonic acid metal-organic frameworks (UiO-66-SO3H) doped with iron for tetracycline (TC) HEF degradation. The catalytic performance of UiO-66-SO3H/Fe(x)-800 was evaluated by comparing different HEF systems, and the effects of different operating parameters and co-existing substances were investigated. The results indicated that UiO-66-SO3H/Fe(1:1)-800 displayed excellent performance for TC degradation over a broad pH range, with an optimal TC degradation efficiency of 90.10% in 90 min and a low energy consumption of 4.39 kWh/kg/TOC. Furthermore, the superior stability and reusability of this catalyst were proved in continuous cycling experiments with low iron leaching (<1.000 ug/L). The mechanism exploration demonstrated that TC was mainly oxidized by ‧OH and 1O2. In addition, iron-doped porous carbon carrier improved the utilization rate of H2O2 and accelerated the regeneration of Fe2+, which played an important role in the HEF process. The HEF system based on UiO-66-SO3H/Fe(1:1)-800 also exhibited satisfactory performance when treating actual water samples, presenting broad application prospects. 

Sulfonic acid metal–organic frameworks derived iron-doped carbon as novel heterogeneous electro-Fenton catalysts for the degradation of tetracycline: Performance and mechanism investigation

Enhanced photocatalytic performance of g-C3N4@Ce-Fe bimetallic oxide with Z-scheme heterojunction for rapid degradation of tetracycline and its photodegradation pathway

Degradation of Orange II by Fe2O3 and CeO2 nanocomposite when assisted by NaHSO3

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Degradation of Orange II by Fe2O3 and CeO2 nanocomposite when assisted by NaHSO3