TiO2-coated EP as a floating photocatalyst for water purification

Długosz, Maciej; Waś, Joanna; Szczubiałka, Krzysztof; Nowakowska, Maria

doi:10.1039/c3ta14951j

Cited by 45 publications

(15 citation statements)

References 26 publications

(21 reference statements)

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“…[1][2][3][4] Compared to suspended or other forms of immobilised photocatalysts, the floating photocatalysts have distinct advantages such as (i) more efficient utilisation of light, (ii) enhanced utilisation of dissolved oxygen at the air-water interface, (iii) better oxidation efficiency, (iv) effective degradation of most organic contaminants, (v) a high degree of reusability and (vi) a facile post-treatment separation process. [5][6][7][8][9][10] The last point may contribute significantly to a lower cost of wastewater treatment. Thus, floating photocatalysts can play a vital role in the development of both localised and large-scale wastewater treatment technologies 11 which is the urgently needed owing to the ever-increasing contamination of most freshwater sources.…”

Section: Introductionmentioning

confidence: 99%

Reusable floating polymer nanocomposite photocatalyst for the efficient treatment of dye wastewaters under scaled‐up conditions in batch and recirculation modes

Das

Mahalingam

2019

J of Chemical Tech & Biotech

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BACKGROUND: In the last decade, research on floating photocatalysts has increased rapidly with polymer substrates being a popular choice. However, most of the published work is on very small volumes and there is very little work on scale-up of such systems. RESULTS:Polystyrene-titanium dioxide nanocomposite floating films were prepared using a facile solvent casting method and tested for the photocatalytic degradation of four different dyes under UV irradiation. The prepared film was characterised by Fourier-transform infrared (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectrometry (ICP-OES) and profilometry. Scale-up studies were done in batch mode under optimised conditions, and for the larger reactor volume, the effect of recirculation was studied. Complete decolourisation of the model dye (Remazol Turquoise Blue) was observed within 80 min in the scaled-up batch process. In the recirculation mode, for a much larger volume of the dye solution, around 75% decolourisation in 6 h was observed. The reusability of the photocatalytic film was tested, and the results promise a minimum decolourisation efficiency of around 70%. Finally, total organic carbon (TOC) and liquid chromatography mass spectrometry (LC-MS) analysis were used to assess the degradation of the dye. The maximum TOC reduction observed was around 25% possibly due to the complex nature of the dye used in this study. The intermediate products of degradation were identified, and a tentative mechanism is suggested. CONCLUSION: This work demonstrates the recirculation aspects of the photocatalytic reactor under the scaled-up conditions for a complex dye. The prepared film showed excellent stability with satisfactory wastewater decontamination under UV irradiation even after repeated use. Figure 5. Effect of catalyst loading and pH. Conditions: 200 mL of 10 ppm Remazol Turquoise Blue (RTB) solution, catalyst loading: 12 wt%.wileyonlinelibrary.com/jctb

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Section: Introductionmentioning

confidence: 99%

Reusable floating polymer nanocomposite photocatalyst for the efficient treatment of dye wastewaters under scaled‐up conditions in batch and recirculation modes

Das

Mahalingam

2019

J of Chemical Tech & Biotech

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“…It can be combined with SiO 2 to form the Ti–O–Si bond firm easily. Such photocatalyst improves thermal stability and increases specific surface area 17 . It also enhances the illumination utilization processes in solar irradiation system.…”

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confidence: 99%

Floating photocatalyst of B–N–TiO2/expanded perlite: a sol–gel synthesis with optimized mesoporous and high photocatalytic activity

Xue

Jiang

Yuan

et al. 2016

Sci Rep

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Optimized mesoporous photocatalyst endowed with high specific surface area and large pore size was synthesized by sol–gel method. These large pore mesoporous materials (33.39 nm) were conducive to the movement of larger molecules or groups in pore path and for effective use of active sites. The high specific surface area (SBET, 99.23 m2 g−1) was beneficial to catalytic oxidation on the surface. Moreover, B and N co-doped anatase TiO2 in the presence of Ti–O–B–N and O–Ti–B–N contributed to the pore structure optimization and enhanced photoresponse capacity with a narrow band gap and red shift of absorption. The obtained materials with floating characteristics based on expanded perlite (EP) showed favorable features for photocatalytic activity. The best RhB photodegration rate of B–N–TiO2/EP (6 mg/g, 24 wt% TiO2) reached 99.1% after 5 h in the visible region and 99.8% after 1 h in the UV region. The findings can provide insights to obtain floatable photocatalysts with simple preparation method, optimized mesoporous, co-doping agents, as well as good photocatalytic performance, coverable and reusability. B–N–TiO2/EP has potential applications for practical environmental purification.

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“…The increase in calcination temperature resulted in the formation of active crystal phase of anatase as well as the rutile phase. According to Długosz et al [19], the mixture of anatase and rutile exhibited higher photocatalytic efficiency because of one-way electron transfer from the anatase conduction band to the rutile conduction band, allowing for more efficient electron hole charge separation. Both our photocatalysts had very high activity when calcined at elevated temperatures, which is typical for the coexistence of anatase and rutile phases.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytical Degradation of Toluene and Cyclohexane Using LED Illumination

Mioduska¹,

Zielińska‐Jurek²,

Hupka³

2017

Pol. J. Environ. Stud.

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A sol-gel process followed by hydrothermal reaction was used to prepare coupled WO 3 -TiO 2 photocatalysts with varying amounts of WO 3 in respect to TiO 2 (3 mol% and 5 mol% respectively). Additionally, photocatalysts have been subjected to different calcination temperatures of 400ºC and 800ºC, which allowed us to compare how these affect photodegradation efficiency. Photocatalysts were characterized under a scanning electron microscope, x-ray diffraction, and by measuring BET surface area. Photocatalytic tests have been carried out following the degradation of toluene and cyclohexane in the gas phase under LED UV light (375 nm). Elevated calcination temperature turned to enhance photocatalytical efficiency of coupled WO 3 -TiO 2 while degrading the model pollutant cyclohexane. It was demonstrated that light emitting diodes (LEDs) can be used effectively as a source of illumination in photoreactors, sufficient to obtain 90% compound elimination from the air during 15 minutes of illumination while applying a wellmatched photocatalyst.

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TiO2-coated EP as a floating photocatalyst for water purification

Cited by 45 publications

References 26 publications

Reusable floating polymer nanocomposite photocatalyst for the efficient treatment of dye wastewaters under scaled‐up conditions in batch and recirculation modes

Reusable floating polymer nanocomposite photocatalyst for the efficient treatment of dye wastewaters under scaled‐up conditions in batch and recirculation modes

Floating photocatalyst of B–N–TiO2/expanded perlite: a sol–gel synthesis with optimized mesoporous and high photocatalytic activity

Photocatalytical Degradation of Toluene and Cyclohexane Using LED Illumination

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