UiO-66-supported Fe catalyst: a vapour deposition preparation method and its superior catalytic performance for removal of organic pollutants in water

Abstract

A vapour deposition (VD) method was established for preparation of the UiO-66-supported Fe (Fe/UiO-66) catalyst, which provided the first case of the metal-organic framework (MOF)-supported Fe catalyst prepared by using the vapour-based method. The Fe loading was around 7.0–8.5 wt% under the present preparation conditions. The crystal structure of UiO-66 was not obviously influenced by the Fe loading, while the surface area significantly decreased, implicating most of the Fe components resided in the pores on UiO-66. The results for the methyl orange (MO) removal tests showed that MO in aqueous solution can be removed by UiO-66 by adsorption, and in contrast, it can be oxidized by H 2 O 2 with the catalysis of Fe/UiO-66. Further catalytic tests showed that Fe/UiO-66 was rather effective to catalyse the oxidation of benzene derivatives like aniline in water in terms of chemical oxygen demand (COD) removal efficiency. The catalytic test results for Fe/UiO-66 were compared to those of Fe/Al 2 O 3 with the same Fe loading and to the catalysts reported in the literature. This paper provides a general strategy for VD preparation of MOF-supported Fe catalyst on the one hand, and new catalysts for removing organic pollutants from water, on the other hand.

Metal–Organic Frameworks for the Removal of Emerging Organic Contaminants in Water

“…Very recently, Lin et al reported a vapor deposition method to prepare an Fe supported UiO-66 as catalyst (UiO-66@Fe; S BET ∼136 m 2 g −1 ; V p ∼0.09 cm 3 g −1 ; pore size ∼2.0 nm), which is able to oxidized MO in the presence of H 2 O 2 (93% in 60 min). 213 Lately, the nanocomposite HPU-4@AgBr based on the 3D Cu-MOF HPU-4 ([Cu(bdmi) 0.5 (H 2 O) 2 ] (H 4 bdmi = 5,5′-1H,1′H-[2,2-biimidazole]-1,1′-diylbis(methylene))diisophthalic acid) and AgBr was tested in the photodegradation of MB and MO dyes. 111 The photocatalytic activity of HPU-4@AgBr (92% of MO in 120 min) is much higher than the physical mixture of pure HPU-4 (∼20%) and AgBr (45%), supporting the synergic effect of the AgBr NPs along with the MOF in the photocatalytic process.…”

“…However, the limitation here could be associated with the difficulty to implement a MW irradiation system in a water treatment plant. Very recently, Lin et al reported a vapor deposition method to prepare an Fe supported UiO-66 as catalyst (UiO-66@Fe; S BET ∼136 m 2 g –1 ; V p ∼0.09 cm 3 g –1 ; pore size ∼2.0 nm), which is able to oxidized MO in the presence of H 2 O 2 (93% in 60 min) . Lately, the nanocomposite HPU-4@AgBr based on the 3D Cu-MOF HPU-4 ([Cu­(bdmi) 0.5 (H 2 O) 2 ] (H 4 bdmi = 5,5′-1 H ,1′ H -[2,2-biimidazole]-1,1′-diylbis­(methylene))­diisophthalic acid) and AgBr was tested in the photodegradation of MB and MO dyes .…”

Insight into the High-Temperature Cycling Stability of a Micro-nanostructured LiNi0.5Mn1.5O4/Graphene Composite Cathode for High-Voltage Lithium-Ion Batteries

“…According to Figure S3, LNMO and LNMO/graphene composite (1000: 5 wt) mainly present microporous windows. 42 Compared with LNMO (35.6 m 2 g −1 ), LNMO/graphene composite (1000:5 wt) presents a larger surface area (49.6 m 2 g −1 ), which contributes to provide enough area for active materials and electrolyte contacting and improve the reaction kinetics.…”

“…The absence of peaks at about 221 and 241 cm –1 and split peaks around 630 cm –1 indicates that all samples are in the Fd 3̅ m space group. , D band and G band at about 1350 and 1560 cm –1 , the characteristic peaks of graphene, are detected from Raman results of LNMO/graphene composites, and the two peaks become stronger with the content of graphene increasing, demonstrating the presence of graphene coating on the LNMO/graphene composite surface. According to Figure S3, LNMO and LNMO/graphene composite (1000: 5 wt) mainly present microporous windows . Compared with LNMO (35.6 m 2 g –1 ), LNMO/graphene composite (1000:5 wt) presents a larger surface area (49.6 m 2 g –1 ), which contributes to provide enough area for active materials and electrolyte contacting and improve the reaction kinetics.…”

Synthesis and assessment of schwertmannite/few-layer graphene composite for the degradation of sulfamethazine in heterogeneous Fenton-like reaction

“…To date, many kinds of solid catalysts, including Fe 0 , α-Fe 2 O 3 , Fe/UiO-66, Cu-ZSM-5, pyrite, etc. have been investigated to reveal their catalytic activities in a heterogeneous Fenton-like process for the removal of a broad range of contaminants [7][8][9][10][11].…”