Solvent Deposition of Titanium Dioxide on Acrylic for Photocatalytic Application

Carlson, Philip J.; Pretzer, and Lori A.; Boyd, Joel E.

doi:10.1021/ie070825i

Cited by 21 publications

(24 citation statements)

References 32 publications

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“…Immobilising the photocatalyst particles on solid supports such as glass, ceramics, polymers, zeolites, sand, etc. has been widely investigated and has successfully enabled easy separation of the photocatalyst [66][67][68][69][70][71]. However, in the process of attaining easy separation, the photocatalytic activity of the immobilised semiconductors decreased remarkably.…”

Section: Introductionmentioning

confidence: 99%

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Mamba

Mishra

2016

Catalysts

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Organic and inorganic compounds utilised at different stages of various industrial processes are lost into effluent water and eventually find their way into fresh water sources where they cause devastating effects on the ecosystem due to their stability, toxicity, and non-biodegradable nature. Semiconductor photocatalysis has been highlighted as a promising technology for the treatment of water laden with organic, inorganic, and microbial pollutants. However, these semiconductor photocatalysts are applied in powdered form, which makes separation and recycling after treatment extremely difficult. This not only leads to loss of the photocatalyst but also to secondary pollution by the photocatalyst particles. The introduction of various magnetic nanoparticles such as magnetite, maghemite, ferrites, etc. into the photocatalyst matrix has recently become an area of intense research because it allows for the easy separation of the photocatalyst from the treated water using an external magnetic field. Herein, we discuss the recent developments in terms of synthesis and photocatalytic properties of magnetically separable nanocomposites towards water treatment. The influence of the magnetic nanoparticles in the optical properties, charge transfer mechanism, and overall photocatalytic activity is deliberated based on selected results. We conclude the review by providing summary remarks on the successes of magnetic photocatalysts and present some of the future challenges regarding the exploitation of these materials in water treatment.

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Section: Introductionmentioning

confidence: 99%

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Mamba

Mishra

2016

Catalysts

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“…A more practical approach is to deposit the photocatalyst on a fixed surface, such as glass (Sobczyń ski & Dobosz 2001), acrylic (Carlson et al 2007) or PET (Meichtry et al 2007) prior to use. This approach eliminates the need for post-irradiation treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Titania is activated by the absorption of UV light (lo400 nm), generating excited electron-hole pairs which drive redox reactions in aqueous media. Degussa P-25 is widely considered to be the benchmark titania photocatalyst and is 80% anatase and 20% rutile, with an average particle size of 30 nm (Carlson et al 2007).…”

Section: Introductionmentioning

confidence: 99%

The photocatalytic enhancement of acrylic and PET solar water disinfection (SODIS) bottles

Carey

Pérez

Arsiaga

et al. 2011

Water Science and Technology

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The solar water disinfection method (SODIS) was modified by the addition of a photocatalytic layer of titania on the interior surface of polyethylene terephthalate (PET) and acrylic bottles. Titania was solvent deposited on the interior of commercially available PET bottles, as well as bottles that were constructed from acrylic. Uncoated and titania-coated acrylic bottles removed 3,000,000-5,000,000 colony forming units per milliliter of K12 E. coli from 670 mL of contaminated water in 40 min of solar irradiance. After five hours of sunlight exposure, the concentration of 10 ppm methyl orange (a representative organic water contaminant), was reduced by 61% using the titania-coated acrylic bottles. The concentration of 87 ppb microcystin-LR (a representative algal toxin) was reduced by 70% after 7 hours of sunlight exposure in the titania-coated acrylic bottles. Acrylic is an effective alternative to PET for use in the SODIS method due to its greater UV transparency. The addition of titania to PET and acrylic bottles confers the ability to remove chemical contaminants in addition to inactivating microbiological contaminants.

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“…Thus, acrylic material is a viable alternative to PET for SODIS bottles. In fact, Carlson et al 37 previously reported that the P25 coatings on acrylic showed greater durability and comparable UV photocatalytic degradation of methyl orange to P25 coatings on glass. In a significant field study, Gelover et al…”

mentioning

confidence: 99%

Solar photocatalysis for water disinfection: materials and reactor design

Keane

McGuigan

Ibáñez³

et al. 2014

Catal. Sci. Technol.

184

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As of 2010, access to clean drinking water is a human right according to UN regulations. Nevertheless, the number of people living in areas without safe drinking water is predicted to increase by three billion by the end of this decade. Several recent cases of E. coli and Cryptosporidium contamination in drinking water are also reported in a number of advanced countries. Therefore ensuring the potability of drinking water is urgent, but highly challenging to both the developing and developed world in the future. A combination of solar disinfection and photocatalysis technology offers real possibilities for removing lethal pathogenic microroganisms from drinking water. The time taken for the conventional SODIS process can be greatly reduced by semiconductor (e.g. TiO2, ZnO, nano-heterojunctions) based photocatalysis. This review addresses the fundamental reaction mechanism, advances in materials synthesis and selection and recent developments in the reactor design for solar energy driven photocatalysis using titanium dioxide. The major advantage of using photo-reactors is that they enhance disinfection by increasing photon flux into the photocatalyst. Other major factors affecting such efficiency of solar-based photocatalysis such as the illuminated volume/total volume ratio, catalyst load and flow rate, are discussed in detail. The significance of using immobilised catalysts over the catalyst powder in slurries is also highlighted. It is noted that, despite encouraging early field studies, the commercialisation and mass production of solar photocatalysis systems remains highly challenging. Recommendations for future directions for addressing issues such as mass transfer, requirement of a standard test method, photo-reactors design and visible light absorption by TiO2 coatings are also discussed

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Solvent Deposition of Titanium Dioxide on Acrylic for Photocatalytic Application

Cited by 21 publications

References 32 publications

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

The photocatalytic enhancement of acrylic and PET solar water disinfection (SODIS) bottles

Solar photocatalysis for water disinfection: materials and reactor design

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