Enhanced photocatalytic degradation by diatom templated mixed phase titania nanostructure

Chetia, Lakhi; Kalita, Debabrat; Ahmed, Gazi A.

doi:10.1016/j.jphotochem.2017.01.035

Cited by 15 publications

(14 citation statements)

References 23 publications

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“…The prominent peaks and various crystal planes in plot (a) are characteristic of MoS 2 revealing the formation of a hexagonal structure of the crystals. [29] and found to be ∼11.07, 13.02, 22.02 and 18.30 nm, respectively. The increase in the crystallite size in MoW-disulphide1 reflects that W forms a better crystal with S compared to Mo.…”

Section: Methodsmentioning

confidence: 92%

Investigation of structural and luminescence properties of nanocrystalline tungsten-incorporated molybdenum disulphide ternary compounds: an experimental and DFT study

Kalita

Chetia

Chetri³

et al. 2019

Bull Mater Sci

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The present manuscript reports the synthesis of tungsten-incorporated molybdenum disulphide ternary compounds in particle form at the nanoscale using existing solid state reactions, followed by ultrasonication and a density functional theory (DFT) investigation of the compound system. The effect of W in the W-inserted MoS 2 ternary compound system is the subject of current research. A comparative study shows enhanced photoluminescence (PL) at room temperature in the as-synthesized transition metal dichalcogenide (TMD) ternary compound. The compositional and structural characterization studies of the materials are performed using XRD, SEM, EDX, TEM and Raman spectroscopy. We have observed that a combination of W and S leads to better crystallinity than the combination of Mo and S in the compound system. The high band gap (BG) energy also confirms the nanoscale dimension of the material system which may be attributed to the formation of excitonic states from spin splitting and band nesting effects. A theoretical investigation of the effect of W in the MoS 2 system using DFT also reveals that insertion of W leads the system toward a direct BG semiconductor (SC). Multiple BGs of the material in the visible light range as found by UV-Visible (UV-Vis) spectroscopy, suggest applicability of these materials in luminescence devices and photocatalytic activity.

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Section: Methodsmentioning

confidence: 92%

Investigation of structural and luminescence properties of nanocrystalline tungsten-incorporated molybdenum disulphide ternary compounds: an experimental and DFT study

Kalita

Chetia

Chetri³

et al. 2019

Bull Mater Sci

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“…However, the intensity of these anatase peaks at 38.15 o , 54.48 o and 62.38 o are decreased indicating effect of diatom in the formation of TNT structure. The broad peak at 22.15 o for diatom due to its amorphous structure [1,16]. Fig.…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 96%

“…At present, industries thrive to keep up with human needs, textile and dyeing industry is not out of the trend. Organic ingredients in textile wastewater are very difficult to biodegrade and toxic to the environment [1]. Consequently, scientists around the world are studying to find ways to handle organic components in wastewater [2].…”

Section: Introductionmentioning

confidence: 99%

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Titanate Tubular Loaded Diatom Fabricated by a Facial Hydrothermal Method for Photocatalytic Enhancement under Visible Light Irradiation

Sang

Minh²,

Phuc³

et al. 2020

MaP

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In this study, homogeneous titanate tubular (TNT) and diatom/TNT composites (D/TNT) were prepared by a facile hydrothermal method. The crystalline structure and morphology of the synthesised samples were studied by X-ray diffractometry (XRD), Raman spectroscopy, Transmission Electron Microscopy (TEM). Furthermore, the photocatalytic activity for degradation of methylene blue (MB) was investigated under sunlight irradiation. The results showed that the MB degradation by D/TNT was higher than bare TNT. Optical properties of the synthesized materials with enhanced photocatalytic activity could be explained through both UV-vis diffuse absorption and photoluminescence emission measurement. These results indicated that there was bandgap narrowing and longer carrier lifetime in the composite sample.

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“…For the fresh Co 3 O 4 /TiO 2 NPs, it was evidenced from the diffraction pattern that both the anatase (2θ = 25. 28°, 36.95°, 37.80°, 38.58°, 48.05°, 53.89°, 55.06°, 75.03°, 82.66°) and the rutile (2θ = 27.45°, 41.23°, 54.32°, 56.64°, 69.00°) existed in the Co 3 O 4 /TiO 2 NPs forming the TiO 2 special crystal phase, which had a better catalytic activity than the single crystal structure (Chetia, Kalita, & Ahmed, 2017). In addition, the diffraction peaks (2θ = 36.8°, 44.8°) corresponded to the characteristic peaks of Co 3 O 4 (JCPDS Card No.…”

Section: Research Articlementioning

confidence: 99%

Degradation of atrazine in aqueous solution through peroxymonosulfate activated by Co‐modified nano‐titanium dioxide

Cai

Yin

et al. 2020

Water Environment Research

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Peroxymonosulfate (PMS) heterogeneous activation by Co3O4‐modified catalyst has shown significant implications to generate free radicals for organic pollutants degradation in water. In this study, PMS heterogeneous activation was applied to degrade atrazine (ATZ) using Co3O4‐mediated titanium dioxide nanoparticles (Co3O4/TiO2 NPs), which were synthesized by sol‐gel method. Firstly, characteristics of the fresh and used Co3O4/TiO2 NPs were analyzed via SEM, TEM, XRD, EDS, and XPS techniques. Then, the influences of several key parameters (i.e., Co3O4/TiO2 NPs dose (0.02–0.3 g/L), PMS dose (0–0.6 mM), initial pH (3.0–11.0), and co‐existing anions) on the ATZ degradation were investigated systematically. Besides, control systems were set up to verify the high efficiency of Co3O4/TiO2 NPs. In addition, the radical scavenging experiments revealed that sulfate and hydroxyl radicals were generated in the Co3O4/TiO2‐PMS system, while sulfate radicals were the dominant reactive species responsible for ATZ degradation. Furthermore, the stability and reusability of the Co3O4/TiO2 NPs were investigated after four consecutive experiments. Based on the identified products, possible degradation pathways of ATZ in the Co3O4/TiO2‐PMS system were proposed. Finally, the possible reaction mechanism of Co3O4/TiO2‐PMS system was proposed according to the comprehensive analysis. Findings of this study provided useful information for the application of Co3O4/TiO2 NPs in recalcitrant organic contaminants degradation. Practitioner points Co3O4/TiO2 NPs were synthesized via the simple sol‐gel method. Co3O4/TiO2 NPs possessed excellent catalytic performance for PMS to eliminate ATZ. Sulfate radicals play a dominant role in the degradation of ATZ. ATZ degradation pathways and reaction mechanism in the system were proposed.

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Enhanced photocatalytic degradation by diatom templated mixed phase titania nanostructure

Cited by 15 publications

References 23 publications

Investigation of structural and luminescence properties of nanocrystalline tungsten-incorporated molybdenum disulphide ternary compounds: an experimental and DFT study

Investigation of structural and luminescence properties of nanocrystalline tungsten-incorporated molybdenum disulphide ternary compounds: an experimental and DFT study

Titanate Tubular Loaded Diatom Fabricated by a Facial Hydrothermal Method for Photocatalytic Enhancement under Visible Light Irradiation

Degradation of atrazine in aqueous solution through peroxymonosulfate activated by Co‐modified nano‐titanium dioxide

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