Effective mineralization of Diclofenac by catalytic ozonation using Fe-MCM-41 catalyst

Chen, Weirui; Li, Xukai; Pan, Zhaoqi; Ma, Sushuang; Li, Laisheng

doi:10.1016/j.cej.2016.06.139

Cited by 109 publications

(38 citation statements)

References 47 publications

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“…For the pure g-C3N4, two main absorption regions are clearly observed, the strong absorption bands in the 1200~1650 cm −1 region were ascribed to the typical skeletal stretching vibration modes of the s-triazine or tri-striazine, which corresponded to the CN heterocycles [22]. The sharp peak centered at 808 cm −1 indicated a characteristic breathing mode of the triazine units, and verified that the prepared photocatalyst was a g-C3N4 or g-C3N4-based catalyst [36][37][38]. For Ag3PO4, the observed strong peak at 546 cm −1 was related to the O=P-O bending vibration, while the peak at 860 cm −1 was assigned to the symmetric and asymmetric vibration modes of P-O-P [39].…”

Section: Structure and Composition Of Ag 3 Po 4 /G-c 3 N 4 Photocatalmentioning

confidence: 76%

Synthesis of Ag3PO4/G-C3N4 Composite with Enhanced Photocatalytic Performance for the Photodegradation of Diclofenac under Visible Light Irradiation

et al. 2018

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Abstract:A new visible-light-driven heterojunction Ag 3 PO 4 /g-C 3 N 4 was prepared by a simple deposition-precipitation method for the degradation analysis of diclofenac (DCF), a model drug component, under visible-light irradiation. The heterojunction photocatalysts were characterized by a suite of tools. The results revealed that the introduction of Ag 3 PO 4 on the surface of g-C 3 N 4 greatly promoted its stability and light absorption performance. In addition, the effects of the heterojunction mixing ratios were studied, when the molar ratio of Ag 3 PO 4 to g-C 3 N 4 in the composite was 30%, the as-prepared photocatalyst Ag 3 PO 4 /g-C 3 N 4 (30%) possessed the best photocatalytic activity toward the photodegradation of DCF, and the optimal photocatalyst showed a DCF degradation rate of 0.453 min −1 , which was almost 34.8 and 6.4 times higher than those of pure g-C 3 N 4 (0.013 min −1 ) and Ag 3 PO 4 (0.071 min −1 ) under visible light irradiation (λ ≥ 400 nm). The trapping experimental results showed that h + , ·OH, and ·O 2 − were the main reactive oxygen species during the photocatalytic reaction. The improved performance of the composites was induced by the high charge separation efficiency of the photogeneration electron-hole pairs as well as the surface plasmon resonance (SPR) endowed in the Ag 0 nanoparticles, and ultimately enhanced the DCF photodegradation.

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Section: Structure and Composition Of Ag 3 Po 4 /G-c 3 N 4 Photocatalmentioning

confidence: 76%

Synthesis of Ag3PO4/G-C3N4 Composite with Enhanced Photocatalytic Performance for the Photodegradation of Diclofenac under Visible Light Irradiation

et al. 2018

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“…Ferric nitrate and copper nitrate were used as Fe precursor and Cu precursor in preparing Fe‐MCM‐41, Cu‐MCM‐41 and Fe‐Cu‐MCM‐41, respectively. The detailed synthesis method can be found elsewhere . In this study, the molar ratio of Si/Fe/Cu was 1/80/80.…”

Section: Methodsmentioning

confidence: 99%

“…Although metal modified MCM‐41 has been reported as catalyst in the ozonation process, most work focused on single transition metal modification (e.g. Fe, Mn, Ce) and pollutant degradation efficiency and degradation pathway . Due to the limited activity of monometallic MCM‐41, it was hard to achieve complete mineralization of the pollutant.…”

Section: Introductionmentioning

confidence: 99%

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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“…At present, developments in the family of mesoporous silica materials are very attractive because of their unique applications in many fields such as biotechnology, biomedicine, optical imaging, and catalysis . Among them, siliceous MCM‐41 is an important class of a one‐dimensional (1D) hexagonal porous materials in which an amorphous SiO 2 network is interposed .…”

Section: Introductionmentioning

confidence: 99%

Phthalhydrazide immobilized on MCM‐41 as a potent and recoverable catalyst for the synthesis of pyrrolo[2,1‐a]isoquinolines

Akrami

Farahi

2019

J Chinese Chemical Soc

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We present a study on the synthesis, characterization, and application of phthalhydrazide‐functionalized MCM‐41 (P‐MCM‐41) as a novel and efficient heterogeneous basic catalyst. The described catalyst was fully characterized via various techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X‐ray (EDX), X‐ray diffraction (XRD), and Fourier transform infrared (FT‐IR). P‐MCM‐41 efficiently catalyzed the four‐component reaction of arylaldehydes, Meldrum's acid, alkyl isocyanides, and isoquinoline in CHCl3 to prepare pyrrolo[2,1‐a]isoquinolines in good yields.

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Effective mineralization of Diclofenac by catalytic ozonation using Fe-MCM-41 catalyst

Cited by 109 publications

References 47 publications

Synthesis of Ag3PO4/G-C3N4 Composite with Enhanced Photocatalytic Performance for the Photodegradation of Diclofenac under Visible Light Irradiation

Synthesis of Ag3PO4/G-C3N4 Composite with Enhanced Photocatalytic Performance for the Photodegradation of Diclofenac under Visible Light Irradiation

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

Phthalhydrazide immobilized on MCM‐41 as a potent and recoverable catalyst for the synthesis of pyrrolo[2,1‐a]isoquinolines

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