Confined ultrasmall MOF nanoparticles anchored on a 3D-graphene network as efficient and broad pH-adaptive photo Fenton-like catalysts

Abstract

Metal-organic frameworks (MOF) for persulfate-based Fenton-like process has attracted tremendous attention nowadays. While the low utilization of active sites and poor stability of MOF is still impeding their practical applications....

Unraveling the Synergy Mechanism between Photocatalysis and Peroxymonosulfate Activation on a Co/Fe Bimetal-Doped Carbon Nitride

“…Unlike the Fenton-like catalysis or photo-Fenton-like catalysis systems, the quenching agent for ·OH in the photocatalytic system uses methanol, which is due to the higher reaction rate constant of methanol with ·OH (1.2∼2.8 × 10 9 M –1 ·s –1 ), while the reaction rate constant of tert -butanol with ·OH is about 3.8∼7.6 × 10 8 M –1 ·s –1 . Besides, EDTA is used as a scavenger for h + in the photocatalytic or photo-Fenton-like systems; note that it is also a blocking agent for metal sites. , As shown in Figure , all the quenching agents in the photocatalytic system had certain inhibition effects on the degradation, indicating that all these active species have certain contributions to the system, but it is worth noting that although l -tryptophan and FFA were both trapping agents of 1 O 2 , their inhibition effects on the degradation were opposite, in which l -tryptophan had a trivial inhibition effect, while FFA had a very strong inhibition effect. The EPR results showed that the production of 1 O 2 in the photocatalysis system was extremely low, so it can be inferred that the actual contribution of 1 O 2 in the photocatalytic system was small, while the strong inhibitory effect of FFA might be due to its oxidation by the h + and/or other radicals.…”

Role of Interface of Metal–Organic Frameworks and Their Composites in Persulfate-Based Advanced Oxidation Process for Water Purification

“…It turns out that the photoassisted catalytic system triggered by this can achieve good degradation performance as well. Shi et al found that 93.2% of TC could be degraded by PMS in the presence of CoFe Prussian blue analogues (PBA) NPs/3D-graphene within 15 min with the assistance of VL . GO precursor was anchored to CoFe PBA to synthesize ultrasmall MOFs confined on the N-doped graphene sheets after carbonization.…”

“…However, Jing et al found that increasing HPO 4 2– concentration favored the NOR degradation, since it could react with SO 4 •– to generate HPO 4 •– , which had relatively high activity in NOR decomposition. H 2 PO 4 – could also promote the AOP due to its buffer ability . It decreased the bond dissociation energy of O–O in PMS, which helped to produce ROS to attack pollutants.…”

Construction of adsorbents with graphene and its derivatives for wastewater treatment: a review

“…Due to their versatile framework compositions, tunable pore sizes, and exposed active sites, MOFs have captured recent research attention worldwide for various important applications such as catalysis, 106 gas storage, 107 energy conversion 108 and storage, 109 drug delivery, 110 sensors, 111 environmental remediation, 112 and optoelectronic devices. 113 While MOF can impede graphene aggregation and bring the active adsorption sites of high density for the MOF–graphene composite, the incorporation of MOF can also mitigate the poor specificity of GO, making the MOF/GO composite selective to a specific pollutant ( e.g.…”