Efficient degradation of methylene blue dye over tungsten trioxide/multi-walled carbon nanotube system as a novel photocatalyst

Dinari, Mohammad; Momeni, Mohamad Mohsen; Ahangarpour, Marzieh

doi:10.1007/s00339-016-0403-2

Cited by 30 publications

(12 citation statements)

References 40 publications

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“…The latter showed high recombination rates of charge carriers of revealed insignificant lifetime, leading to a lower photocatalytic performance. Apparently, our catalyst shows higher photocatalytic efficiency compared with some WO 3 -based graphene composites toward the degradation of the MB dye (Fan et al, 2012; Azimirad and Safa, 2015; Sun et al, 2015; Dinari et al, 2016; Liu et al, 2017). As revealed, their photocatalytic efficiencies are found to be in the range 65–95% within 56–180 min as well as with lower rates than ours.…”

Section: Resultsmentioning

confidence: 79%

Synthesis of Graphene Oxide Interspersed in Hexagonal WO3 Nanorods for High-Efficiency Visible-Light Driven Photocatalysis and NH3 Gas Sensing

et al. 2019

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WO3 nanorods and GO (at 1 wt% loading) doped WO3 were synthesized using a template free deposition-hydrothermal route and thoroughly characterized by various techniques including XRD, FTIR, Raman, TEM-SAED, PL, UV-Vis, XPS, and N2 adsorption. The nano-materials performance was investigated toward photocatalytic degradation of methylene blue dye (20 ppm) under visible light illumination (160 W, λ> 420) and gas sensing ability for ammonia gas (10–100 ppm) at 200°C. HRTEM investigation of the 1%GO.WO3 composite revealed WO3 nanorods of a major d-spacing value of 0.16 nm indexed to the crystal plane (221). That relevant plane was absent in pure WO3 establishing the intercalation with GO. The MB degradation activity was considerably enhanced over the 1%GO.WO3 catalyst with a rate constant of 0.0154 min−1 exceeding that of WO3 by 15 times. The reaction mechanism was justified dependent on electrons, holes and •OH reactive species as determined via scavenger examination tests and characterization techniques. The drop in both band gap (2.49 eV) and PL intensity was the main reason responsible for enhancing the photo-degradation activity of the 1%GO.WO3 catalyst. The later catalyst initiated the two electron O2 reduction forming H2O2, that contributed in the photoactivity improvement via forming •OH moieties. The hexagonal structure of 1%GO.WO3 showed a better gas sensing performance for ammonia gas at 100 ppm (Ra-Rg/Rg = 17.6) exceeding that of pure WO3 nanorods (1.27). The superiority of the gas-sensing property of the 1%GO.WO3 catalyst was mainly ascribed to the high dispersity of GO onto WO3 surfaces by which different carbon species served as mediators to hinder the recombination rate of photo-generated electron-hole pairs and therefore facilitated the electron transition. The dominancy of the lattice plane (221) in 1%GO.WO3 formed between GO and WO3 improved the electron transport in the gas-sensing process.

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Section: Resultsmentioning

confidence: 79%

Synthesis of Graphene Oxide Interspersed in Hexagonal WO3 Nanorods for High-Efficiency Visible-Light Driven Photocatalysis and NH3 Gas Sensing

et al. 2019

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“…As mentioned above, some WO 3 -based and graphene-based composites had been prepared for the degradation of organic pollutants [ 26 , 27 , 42 , 43 , 55 ]. As shown in Table 1 , their photocatalytic efficiency is usually 65–95% within 56–150 min.…”

Section: Resultsmentioning

confidence: 99%

“…Liu et al [ 26 ] prepared heterojunction of WO 3 /g-C 3 N 4 with well-defined morphology by in-situ liquid phase process, and start materials metal-free g-C 3 N 4 was synthesized by a thermal polycondensation method. The sample was obtained by heating in Ar atmosphere at 400 °C for 3 h. Dinari et al [ 27 ] studied tungsten trioxide/multi-walled carbon nanotube system (MWCNT/WO 3 ) as a novel photocatalyst by solvothermal process. The MWCNT/WO 3 hybrid nanostructures exhibited higher photocatalytic activity than pure WO 3 or MWCNTs due to their higher absorption enhancement in visible light region.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of WO3/Graphene Nanocomposites for Enhanced Photocatalytic Activities by One-Step In-Situ Hydrothermal Reaction

Gong

et al. 2018

Materials

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Tungsten trioxide (WO3) nanorods are synthesized on the surface of graphene (GR) sheets by using a one-step in-situ hydrothermal method employing sodium tungstate (Na2WO4·2H2O) and graphene oxide (GO) as precursors. The resulting WO3/GR nanocomposites are characterized by X-ray diffraction, Raman spectroscopy, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The results confirm that the interface between WO3 nanorod and graphene contains chemical bonds. The enhanced optical absorption properties are measured by UV-vis diffuse reflectance spectra. The photocatalytic activity of the WO3/GR nanocomposites under visible light is evaluated by the photodegradation of methylene blue, where the degradation rate of WO3/GR nanocomposites is shown to be double that of pure WO3. This is attributed to the synergistic effect of graphene and the WO3 nanorod, which greatly enhances the photocatalytic performance of the prepared sample, reduces the recombination of the photogenerated electron-hole pairs and increases the visible light absorption efficiency. Finally, the photocatalytic mechanism of the WO3/GR nanocomposites is presented. The synthesis of the prepared sample is convenient, direct and environmentally friendly. The study reports a highly efficient composite photocatalyst for the degradation of contaminants that can be applied to cleaning up the environment.

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“…The surface modi cation of WO 3 NP was reported to enhance its dye removal activity 53 . Dinari and his colleagues reported enhancement in methylene blue dye removal by a photocatalytic modi ed multi-walled carbon nanotube/WO 3 compared to WO 3 NP 54 . The two separate AAs revealed no detectable decolorization activity toward both dyes solution (Fig.…”

Section: Dye Decolorization Activity Of Prepared Wo 3 and Modi Ed Wo 3 -Aas Npsmentioning

confidence: 99%

Novel Nanocombinations of L-tryptophan and L-cysteine: Preparation, Characterization and Their Applications for Dye Decolorization, Antimicrobial and Anticancer Activities

Abd-Elhamid

El‐Gendi

Abdallah

et al. 2021

Preprint

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Tungsten oxide WO3 nanoparticles (NPs) were prepared in a form of nanosheets with a homogeneous size and dimensions in one step through acid precipitation using a cation exchange column. The resulting WO3 nanosheets surface was decorated with one of the two amino acids (AAs) L-tryptophan (Trp) or L-cysteine (Cys) for their dye removal, antimicrobial, and antitumor activities. A noticeable improvement in the biological activity of WO3 NPs was detected upon amino acid modification compared to the original WO3. The prepared WO3-Trp and WO3-Cys exhibited strong dye removal activity toward methylene blue and safranin dyes with complete dye removal (100%) after 6 h. WO3-Cys NPs and WO3-Trp NPs revealed higher broad-spectrum antibacterial activity toward both G-ve and G+ve bacteria with strong antifungal activity toward Candida albicans. Anticancer results of the modified WO3-Cys and WO3-Trp NPs against various kinds of cancer cells including MCF-7, caco-2, and HepG-2 cells indicated that they have a potent effect in a dose-dependent manner with high selectivity to cancer cells and safety against normal cells. The expression levels of E2F2, Bcl-2 genes were found to be suppressed after treatment with both WO3-Cys and WO3-Trp NPs more than 5-FU-treated cells. While expression level of the p53 gene in all tested cells was evidently up-regulated after treatment by more than 5-8 folds as compared to untreated cells. The docking results confirmed the ability of both NPs to bind to P53 gene with relevant potency in binding to other tested gens and participation of cysteine SH-functional group in such interaction.

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Efficient degradation of methylene blue dye over tungsten trioxide/multi-walled carbon nanotube system as a novel photocatalyst

Cited by 30 publications

References 40 publications

Synthesis of Graphene Oxide Interspersed in Hexagonal WO3 Nanorods for High-Efficiency Visible-Light Driven Photocatalysis and NH3 Gas Sensing

Synthesis of Graphene Oxide Interspersed in Hexagonal WO3 Nanorods for High-Efficiency Visible-Light Driven Photocatalysis and NH3 Gas Sensing

Synthesis and Characterization of WO3/Graphene Nanocomposites for Enhanced Photocatalytic Activities by One-Step In-Situ Hydrothermal Reaction

Novel Nanocombinations of L-tryptophan and L-cysteine: Preparation, Characterization and Their Applications for Dye Decolorization, Antimicrobial and Anticancer Activities

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