Novel synthesis approaches for WO3‐TiO2/MWCNT composite photocatalysts- problematic issues of photoactivity enhancement factors

Bárdos, Enikő; Kovács, Gábor; Gyulavári, Tamás; Németh, Kornél; Kecsenovity, Egon; Berki, Péter; Baia, Lucian; Pap, Zsolt; Hernádi, Klára

doi:10.1016/j.cattod.2017.03.019

Cited by 25 publications

(14 citation statements)

References 40 publications

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“…The characteristic TiO 2 peaks at 150, 412, 520 and 640 cm À1 are assigned to the E g , B 1g , B 1g + A 1g and E g modes of anatase phase, respectively (24). The WO 3 crystalline structure bands are located at around 800 cm À1 , while the band at 265 cm À1 is associated with the O-W-O bending (10). In addition, the characteristic G band (1596 cm À1 ) of carbon fiber was observed, which indicates the first-order scattering of the E 2g phonon of the sp 2 C atom (25).…”

Section: Characterization Of Catalystsmentioning

confidence: 98%

“…The combination of WO 3 /TiO 2 with carbonaceous materials can result in a superior photocatalytic activity for target pollutants. Therefore, researchers have prepared carbonaceous WO 3 /TiO 2 structures including graphene , carbon nanotubes , fullerene , carbon nitride and activated carbon . However, to the best of our knowledge, no study was published about the photocatalytic activities of ternary composites including TiO 2 and WO 3 deposited on microporous carbon fibers.…”

Section: Introductionmentioning

confidence: 99%

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Solvothermal synthesis of WO₃/TiO₂/carbon fiber composite photocatalysts for enhanced performance under sunlight illumination

Balta

Şimşek

Berek

2019

Photochem & Photobiology

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Carbon fiber (CF)‐based WO3/TiO2 composite catalysts (WO3/TiO2/CF) were successfully synthesized by solvothermal method. The catalysts were characterized by XPS, SEM, BET, XRD, FTIR, Raman and UV–Vis. The analyses confirmed the WO3/TiO2 nanoparticles with high crystallinity deposited on the carbon structure. The photocatalytic degradation of Orange II azo dye under UV and sunlight illumination with the synthesized catalyst was explored. The composite catalyst displayed high performance (85%) for Orange II degradation while that of for WO3/TiO2 was found as 76%. The effects of CF amount, solution pH, initial dye concentration and catalyst dose on photocatalytic performance were studied. It was found that the degradation efficiency increased from 68% to 90% with the increasing CF amount from 3 wt% to 5 wt%, while the further increase in CF amount (7–10 wt%) decreased the photodegradation due to the blocking the active sites of WO3/TiO2. The enhanced photocatalytic efficiency was mainly attributed to the electrical properties of the CF and reduced bandgap.

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Section: Characterization Of Catalystsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Solvothermal synthesis of WO₃/TiO₂/carbon fiber composite photocatalysts for enhanced performance under sunlight illumination

Balta

Şimşek

Berek

2019

Photochem & Photobiology

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Section: Photocatalytic Nanomaterials For Membrane Modificationmentioning

confidence: 99%

“…For example, carbon nanotube (CNT) or halloysite nanotube (HNT) as composite components can enhance the photocatalytic efficiency of TiO 2 by preventing the recombination of e − /h + pairs produced by TiO 2 under UV irradiation 1,129,173,179,180 . The addition of tungsten trioxide (WO 3 ) can also enhance the photocatalytic activity of TiO 2 by reducing the recombination rate of e − /h + pairs, and it can result in increased visible light activity 141,180,181 . Some studies show that the deposition of silica, zeolite, clay, or even noble metals such as gold (Au), platinum (Pt), palladium (Pd), copper (Cu), and silver (Ag) nanoparticles onto TiO 2 can both increase the photocatalytic properties and prolong the lifetime of charge carriers; however, the properties of the noble metal should be studied carefully because it can affect the photocatalytic activity 129,139,181–184 .…”

Section: Photocatalytic Nanomaterials For Membrane Modificationmentioning

confidence: 99%

Photocatalytic membrane filtration and its advantages over conventional approaches in the treatment of oily wastewater: A review

Santos

László

Hodúr

et al. 2020

Asia-Pacific J Chem Eng

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Clean water supply has become one of the biggest challenges of the 21st century; therefore, water source protection is of increasing importance. Beyond environmental protection reasons, economic concerns-derived from increasing costs of processing water and wastewater discharge-also prompt industries to use advanced wastewater treatment methods, which ensure higher purification efficiency or even the recycling of water. Therefore, highly effective treatment of oily wastewaters has become an urgent necessity because they are produced in high quantities and have harmful effects on both the environment and human population. However, high purification efficiency can be difficult to achieve, because some compounds are hard to eliminate. Conventional methods are effective for the removal of floating and dispersed oil, but for finely dispersed, emulsified and dissolved oil advanced methods must be used, such as membrane filtration which exhibits several advantages. The application of this technology is restricted by fouling-the major limiting factor-which jeopardizes the membrane performance. In order to reduce fouling, in-depth research is being conducted to make the treatment of oilcontaminated water technically and economically feasible. The present work aims to review the conventional oil separation methods with their limitations and to focus on membrane filtration, which ensures significantly higher purification efficiencies, including the main problem: the flux reduction caused by fouling. This paper also discusses promising solutions, such as membrane modification methods, mostly with hydrophilic and/or photocatalytic nanoparticles and nanocomposites, overviewing the efforts that are being made to develop feasible technologies to treat oil-contaminated waters.

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“…When WO 3 -TiO 2 was dispersed on monowalled carbon nanotubes (MWCNT), several factors responsible for the photocatalytic activity enhancement can be found in the WO 3 -TiO 2 /MWCNT nanocomposite system. Different synthesis approaches led to different crystal phase compositions thus affecting the photocatalytic activity [22]. p-Nitrophenol, widely used in industry and agriculture, has significantly contaminated water bodies, severely affecting the aquatic ecosystem.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol

Sánchez

Chen

Wang

et al. 2019

International Journal of Photoenergy

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Double modifications of TiO2 by doping with WO3 and by dispersing on a SiO2 support were made by the one-pot sol-gel method. Doping with W shifts the TiO2 band gap energy from 3.2 eV to around 3.06 eV. The surface area of the supported W-TiO2/SiO2 material was significantly increased, by approximately 3 times, in comparison to the bare TiO2. The photocatalytic activities of the catalysts were evaluated in the degradation reaction of p-nitrophenol in aqueous solution and basic medium. After 240 min of photodegradation, more than approximately 99% p-nitrophenol could be mineralized with the most active W-TiO2/SiO2 catalyst. Under UV irradiation, p-nitrophenol was initially photodegraded into hydroquinone and benzosemiquinone intermediates, which were further degraded into smaller fragments such as organic carboxylic acids and finally completely mineralized. A proposed photoreaction mechanism was presented based on the key roles of the surface hydroxyl species and superoxide radicals such as O2- and ⋅OH, together with W6+/W5+ couples and e-/h+ pairs in the catalysts in the p-nitrophenol photodegradation. The one-pot sol-gel synthesis method was proven to be effective to obtain W-TiO2/SiO2 catalyst with large surface area and high photocatalytic activity, and it can be also used for the preparation of other heterogeneous catalysts.

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Novel synthesis approaches for WO3‐TiO2/MWCNT composite photocatalysts- problematic issues of photoactivity enhancement factors

Cited by 25 publications

References 40 publications

Solvothermal synthesis of WO₃/TiO₂/carbon fiber composite photocatalysts for enhanced performance under sunlight illumination

Solvothermal synthesis of WO₃/TiO₂/carbon fiber composite photocatalysts for enhanced performance under sunlight illumination

Photocatalytic membrane filtration and its advantages over conventional approaches in the treatment of oily wastewater: A review

One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol

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Novel synthesis approaches for WO3‐TiO2/MWCNT composite photocatalysts- problematic issues of photoactivity enhancement factors

Cited by 25 publications

References 40 publications

Solvothermal synthesis of WO3/TiO2/carbon fiber composite photocatalysts for enhanced performance under sunlight illumination

Solvothermal synthesis of WO3/TiO2/carbon fiber composite photocatalysts for enhanced performance under sunlight illumination

Photocatalytic membrane filtration and its advantages over conventional approaches in the treatment of oily wastewater: A review

One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol

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Solvothermal synthesis of WO₃/TiO₂/carbon fiber composite photocatalysts for enhanced performance under sunlight illumination

Solvothermal synthesis of WO₃/TiO₂/carbon fiber composite photocatalysts for enhanced performance under sunlight illumination