Solar photocatalysis, photodegradation of a commercial detergent in aqueous TiO2 dispersions under sunlight irradiation

Ōyama, Toshiyuki; Aoshima, Akio; Horikoshi, Satoshi; Hidaka, Hisao; Zhao, Jincai; Serpone, Nick

doi:10.1016/j.solener.2004.04.020

Cited by 60 publications

(32 citation statements)

References 30 publications

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“…This is further evident with the change in the dark adsorption with slurry pH in Figure 4, which shows that pollutant species during the dark adsorption remained constant between pH of 7.4 and 5.0 but then increased sharply to reach a maximum of 32.4% adsorption at pH 3.0. Another research involving anionic surfactants has also shown preferential photooxidation at low pH [29,30]. Being radical scavengers, carbonate anions present in the wastewater can inhibit photooxidation [31].…”

Section: Effect Of Slurry Initial Phmentioning

confidence: 99%

Photocatalytic Treatment of Shower Water Using a Pilot Scale Reactor

Boyjoo

Ang

Pareek

2012

International Journal of Photoenergy

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Treatment of shower water deserves special consideration for reuse not only because of its low pollutant loading but also because it is produced in large quantities. In this study, a pilot scale study of photocatalytic degradation of impurities in real shower water was performed in a 31 L volume reactor using titanium dioxide as the photocatalyst. The reactor was operated in a continuous slurry recirculation mode. Several operational parameters were studied including the slurry initial pH, catalyst concentration, air flow rate, and slurry recirculation rate. Up to 57% of total organic carbon (TOC) elimination was obtained after 6 hours of treatment (for 3.0 slurry initial pH, 0.07 gL −1 catalyst concentration, 1.8 Lmin −1 air flow rate, and 4.4 Lmin −1 slurry recirculation rate). This study showed that photocatalysis could be successfully transposed from bench scale to pilot scale. Furthermore, the ease of operation and the potential to use solar energy make photocatalysis an attractive prospect with respect to treatment of grey water.

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Section: Effect Of Slurry Initial Phmentioning

confidence: 99%

Photocatalytic Treatment of Shower Water Using a Pilot Scale Reactor

Boyjoo

Ang

Pareek

2012

International Journal of Photoenergy

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“…In this microreactor, significant degradation can be obtained within about 10 s, this is impressive as compared to the typically a few hours in bulk photocatalytic reactors. 4,19,23,24,35,37,44 In addition, this microreactor requires only a few millilitres of sample due to the small reaction chamber. This is useful when the photocatalysts and the sample solution are costly.…”

Section: Discussionmentioning

confidence: 99%

“…For example, microchannels have been extensively used as the reaction chamber for photocatalysis, [21][22][23][24][25][26][27][28][29][30][31] the surface-area-to-volume ratio is typically in the range of 10 000-300 000 m 2 /m 3 , 21,22,26 at least two orders of magnitude larger than the typical value of 600 m 2 /m 3 in the bulk reactors. [35][36][37] For this reason, significant enhancement of the reaction rate has been observed in the microchannel reactors as compared to the bulk reactors. [21][22][23][24][25][26][27][28][29][30][31] Recently, our group has presented an improved design-planar microreactor.…”

Section: Introductionmentioning

confidence: 99%

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Microfluidic reactors for visible-light photocatalytic water purification assisted with thermolysis

Wang¹,

Tan²,

Wan³

et al. 2014

Biomicrofluidics

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Photocatalytic water purification using visible light is under intense research in the hope to use sunlight efficiently, but the conventional bulk reactors are slow and complicated. This paper presents an integrated microfluidic planar reactor for visible-light photocatalysis with the merits of fine flow control, short reaction time, small sample volume, and long photocatalyst durability. One additional feature is that it enables one to use both the light and the heat energy of the light source simultaneously. The reactor consists of a BiVO 4 -coated glass as the substrate, a blank glass slide as the cover, and a UV-curable adhesive layer as the spacer and sealant. A blue light emitting diode panel (footprint 10 mm Â 10 mm) is mounted on the microreactor to provide uniform irradiation over the whole reactor chamber, ensuring optimal utilization of the photons and easy adjustments of the light intensity and the reaction temperature. This microreactor may provide a versatile platform for studying the photocatalysis under combined conditions such as different temperatures, different light intensities, and different flow rates. Moreover, the microreactor demonstrates significant photodegradation with a reaction time of about 10 s, much shorter than typically a few hours using the bulk reactors, showing its potential as a rapid kit for characterization of photocatalyst performance.

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“…The vision is to create some solar photocatalysis remediation systems, where TiO 2 or ZnO are used to convert toxic contaminants, such as chlorinated detergents, into benign products using sun radiation. There is evidence that those semiconductors can photodegrade numerous toxic compounds [35], but the technology requires improvements in term of efficiency, since TiO 2 or ZnO only adsorb UV light which represents only 5% of the solar spectrum. In this context, nanotechnology could bring an improvement in the form of nanoparticles with surfaces modified with organic or inorganic dyes to increase the photoresponse window of TiO 2 and ZnO from UV to visible light [36].…”

Section: Pollution Remediation and Treatmentmentioning

confidence: 99%

Use of nanotechnology for clean and safer future environment

Guha¹

2017

ijsrm

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Solar photocatalysis, photodegradation of a commercial detergent in aqueous TiO2 dispersions under sunlight irradiation

Cited by 60 publications

References 30 publications

Photocatalytic Treatment of Shower Water Using a Pilot Scale Reactor

Photocatalytic Treatment of Shower Water Using a Pilot Scale Reactor

Microfluidic reactors for visible-light photocatalytic water purification assisted with thermolysis

Use of nanotechnology for clean and safer future environment

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