Nanostructured Titanium Dioxide for Photocatalytic Water Treatment

Rickerby, D. G.

doi:10.1002/9781118845530.ch10

Cited by 9 publications

(5 citation statements)

References 115 publications

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“…This has important ramifications for the way in which crystal size, through minimization of the total free energy, influences the shape. Simulations based on the DFT model correspond closely with the shape of anatase nanocrystals synthesized under quasi-equilibrium conditions [107]. Preferential growth of low energy {101} surfaces causes the bipyramid shape predicted by the standard Wulff construction to elongate as the crystal size is decreased, leading to a consequent reduction in the area of the {001} truncation facets.…”

Section: Nano Titanium Dioxide For Water Purificationsupporting

confidence: 54%

Benefits and risks of nanozerovalent iron, titanium dioxide nanoparticles and carbon nanotubes for water treatment technologies

David¹

2017

Adv. Mater. Lett.

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An overview is presented of potential improvements in performance that can be achieved by using three different types of nanomaterials in water treatment applications: (i) zerovalent iron for reducing concentrations of chlorinated hydrocarbons and heavy metals in groundwater; (ii) titanium dioxide for photocatalytic drinking water purification, enabling reduced consumption of chemicals for disinfection; (iii) carbon nanotube membrane filters that transport water molecules at elevated fluxes, while rejecting other molecules and ions. The distinctive characteristics of the nanomaterials, such as high specific surface area, enhanced reactivity and adsorption capacity, have already led to significant increases in efficiency. Future developments are expected based on surface modification of zerovalent iron to improve its reactivity and transport characteristics, advanced chemical synthesis methods to increase the area of photoreactive facets and doping to inhibit electron-hole recombination or to allow visible light photocatalysis in titanium dioxide, and functionalization of carbon nanotubes to increase ion rejection rates. Implementation of these innovative methods for removal of contaminants from water will be contingent on reduction of the present high cost of the nanomaterials and assessment of the possible risks associated with their, as yet only partly understood, toxic and ecotoxic properties.

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Section: Nano Titanium Dioxide For Water Purificationsupporting

confidence: 54%

Benefits and risks of nanozerovalent iron, titanium dioxide nanoparticles and carbon nanotubes for water treatment technologies

David¹

2017

Adv. Mater. Lett.

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“…Every electron released from the valence band to the conduction band is replaced by the environment around it. Therefore, all components should be theoretically reusable and therefore "green" [48]. To verify the reusability of the nanocomposite, a quantity of 5 mg of annealed MS-TiO 2 -10 containing 8.7 wt.% Ti was repeatedly employed in treating 1 mL of 10 4 CFU/mL E. coli suspensions for three cycles.…”

Section: Reusability Testsmentioning

confidence: 99%

Magnetically Recoverable and Reusable Titanium Dioxide Nanocomposite for Water Disinfection

Keeley

Kisslinger

Adamson

et al. 2021

JMSE

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A bifunctional magnetic Fe3O4@SiO2@TiO2 or MS-TiO2 antimicrobial nanocomposite was prepared based on simple sol-gel methods with common equipment and chemicals. Reaction pH was found to influence the TiO2 upload in the nanocomposite. The alkaline condition produced the greatest TiO2 upload, while the acidic condition the least. Annealing at 300 °C turned the as-synthesized amorphous TiO2 into one with high content of anatase, the most photoactive form of TiO2. Irradiated by 365 nm UV light, a sample of 30 mg/mL of annealed nanocomposite containing 12.6 wt.% Ti was shown to be able to completely eradicate 104 CFU/mL of the laboratory-grown E. coli within 25 min, 25 min faster than the control when the 365 nm UV light was employed alone. The nanocomposite demonstrated consistent antimicrobial performance over repeated uses and was easily recoverable magnetically due to its high magnetization value (33 emu/g). Additionally, it was shown to reduce the bacterial count in a real surface water sample containing 500–5000 CFU/mL of different microbes by 62 ± 3% within 30 min. The irradiating 365 nm UV light alone was found to have generated little biocidal effect on this surface water sample. The nanocomposite is promising to serve as an effective, safe, and eco-friendly antimicrobial agent, especially for surface water disinfection.

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“…All microcosms were incubated at 14°C for 21 days under shaking (140 rpm), and water suspensions were renewed every 7 days. The experiment was performed in the absence of light, because TiO2 is photosensitive, especially reactive to ultraviolet radiation (Rickerby 2014;Li et al 2014b).…”

Section: Exposure In Microcosmsmentioning

confidence: 99%

“…Nanoparticles of TiO2 are often applied in wastewater effluent treatments and chlorine-free disinfection due to their photocatalytic properties (Rickerby 2014). However, the nonporous structure of the bare nano-TiO2 and their aggregation capacity in water may limit the photocatalytic and adsorption of organic contaminants in aquatic environments.…”

Section: Introductionmentioning

confidence: 99%

Can photocatalytic and magnetic nanoparticles be a threat to aquatic detrital food webs?

Pradhan

Fernandes

Martins

et al. 2021

Science of The Total Environment

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Nanostructured Titanium Dioxide for Photocatalytic Water Treatment

Cited by 9 publications

References 115 publications

Benefits and risks of nanozerovalent iron, titanium dioxide nanoparticles and carbon nanotubes for water treatment technologies

Benefits and risks of nanozerovalent iron, titanium dioxide nanoparticles and carbon nanotubes for water treatment technologies

Magnetically Recoverable and Reusable Titanium Dioxide Nanocomposite for Water Disinfection

Can photocatalytic and magnetic nanoparticles be a threat to aquatic detrital food webs?

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