Large scale preparation of Cu-doped α-FeOOH nanoflowers and their photo-Fenton-like catalytic degradation of diclofenac sodium

Xu, Junge; Li, Yunqin; Yuan, Baoling; Shen, Chunhua; Fu, Ming‐Lai; Cui, Hao‐Jie; Sun, Wenjie

doi:10.1016/j.cej.2016.01.059

Cited by 123 publications

(33 citation statements)

References 45 publications

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“…As shown in Equations (1)–, the electron of ≡Cu(I) would transfer to ≡Fe(III), generating ≡Fe(II) and ≡Cu(II). Hydroxyl radicals (·OH) were formed via an electron transfer process of ≡Fe(II/III) and O 3 . The reduction of surface Fe 3+ to Fe 2+ was observed with ozone decomposition to verify our hypothesis.…”

Section: Resultssupporting

confidence: 59%

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Effective catalytic ozonation for oxalic acid degradation with bimetallic Fe‐Cu‐MCM‐41: operation parameters and mechanism

Chen

Liu

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND The formation of carboxylic acid, especially oxalic acid (OA), limits the complete mineralization of organic pollutant in both ozonation and catalytic ozonation. Bimetallic catalyst is well known for its catalytic activity. In this study, bimetallic Fe‐Cu‐MCM‐41 is synthesized to accelerate ozone decomposition to ·OH and enhance OA degradation. RESULTS After the employment of Fe‐Cu‐MCM‐41/O3, 95% OA was removed at 60 min, which was much higher than that in Fe‐MCM‐41/O3 (23.4%), Cu‐MCM‐41/O3 (69.7%) and a single ozonation process (16.5%). Using pyridine adsorption–IR, ESR and XPS, a relationship was found between catalytic activity of catalysts, Lewis acid sites and electron transfer effect. OA degradations were found to follow a hydroxyl radical mechanism. The Fe‐Cu‐MCM‐41/O3 process was sensitive to pH value; a higher removal efficiency was achieved under alkaline conditions. Fe‐Cu‐MCM‐41 significantly accelerated ozone decomposition, hydroxyl radicals and hydrogen peroxide generation. CONCLUSIONS Co‐incorporating Fe and Cu successfully increased the number of Lewis acid sites on MCM‐41. Electron transfers between Fe(II/III), Cu(I/II) and O3 were also found. The joint function of Lewis sites and the electron transfer effect enhanced ·OH generation and OA degradation. Fe‐Cu‐MCM‐41 showed bright prospects for use in water treatment processes. © 2017 Society of Chemical Industry

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Section: Resultssupporting

confidence: 59%

“…Hydroxyl radicals (·OH) were formed via an electron transfer process of ≡Fe(II/III) and O 3 . 38,39 The reduction of surface Fe 3+ to Fe 2+ was observed with ozone decomposition to verify our hypothesis. As can be seen in Table S2, Fe 2+ was gradually generated with prolonged reaction time.…”

Section: Degradation Of Oa In Different Oxidation Processessupporting

confidence: 65%

Effective catalytic ozonation for oxalic acid degradation with bimetallic Fe‐Cu‐MCM‐41: operation parameters and mechanism

Chen

Liu

et al. 2017

J of Chemical Tech & Biotech

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“…The flower-like α-FeOOH was synthesized according to the reported literature. [16] In a typical experiment (Scheme S1), FeSO 4 · 7H 2 O (5.56 g) was dissolved in a mixture of deionized water (160 mL) and ethanol (40 mL) under sonication. Then urea (1.2 g) was added and the resulted solution was stirred at ambient temperature for 10 minutes.…”

Section: Preparation Of the α-Feooh Nanoflowermentioning

confidence: 99%

Hydroxyl Assisted Rhodium Catalyst Supported on Goethite Nanoflower for Chemoselective Catalytic Transfer Hydrogenation of Fully Converted Nitrostyrenes

Liu

et al. 2019

Adv Synth Catal

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Control of chemoselectivity is a special challenge for the reduction of nitroarenes bearing one or more unsaturated groups. Here, we report a flower‐like Rh/α‐FeOOH catalyst for the chemoselective hydrogenation of nitrostyrene to vinylaniline over full conversion, which benefits the new functionalized aminostyrene because the multisubstituted aminostyrenes are usually commercially unavailable. This catalyst does not only show desirable selectivity for the vinylanilines, but also exhibits the inertness to various other reducible groups over wide reaction duration. The catalytic selectivity for the reduction of the nitro group towards vinyl group was investigated by the control experiments and FT‐IR analysis. We have found that the abundant hydroxyl groups in the α‐FeOOH may contribute to the improvement of catalytic activity and selectivity. Furthermore, the catalyst exhibits excellent stability and keeps its catalytic performance even after 6 cycles.

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“…≡Fe II + H2O2 → ≡Fe III + • OH + OH - (9) Similarly to Fe, Cu also activated H2O2 via the reactions as follows [33,68]: . (13, 14)), which can attack target organic [69].…”

Section: Proposed Mechanism For Mo Degradationmentioning

confidence: 99%

Heterogeneous photo-Fenton degradation of organics using highly efficient Cu-doped LaFeO3 under visible light

Phan

Nikoloski

Bahri

et al. 2018

Journal of Industrial and Engineering Chemistry

110

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Large scale preparation of Cu-doped α-FeOOH nanoflowers and their photo-Fenton-like catalytic degradation of diclofenac sodium

Cited by 123 publications

References 45 publications

Effective catalytic ozonation for oxalic acid degradation with bimetallic Fe‐Cu‐MCM‐41: operation parameters and mechanism

Effective catalytic ozonation for oxalic acid degradation with bimetallic Fe‐Cu‐MCM‐41: operation parameters and mechanism

Hydroxyl Assisted Rhodium Catalyst Supported on Goethite Nanoflower for Chemoselective Catalytic Transfer Hydrogenation of Fully Converted Nitrostyrenes

Heterogeneous photo-Fenton degradation of organics using highly efficient Cu-doped LaFeO3 under visible light

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