Eco-efficient TiO2 modification for air pollutants oxidation

Karapati, S.; Giannakopoulou, T.; Todorova, N.; Boukos, N.; Dimotikali, D.; Trapalis, C.

doi:10.1016/j.apcatb.2015.04.012

Cited by 31 publications

(13 citation statements)

References 51 publications

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“…In this synthesis, oleylamine plays a role in the following parts 21 : (i) providing alkaline environment for the precipitation of LDH via the protonation of amine; (ii) forming reverse micelles in the water/oil mixture for crystal nucleation and growth; (iii) excess oleylamine can be recycled for continued use. We believe that the protonated amine head groups are oriented together to form nanosized reactors, because the polarized OH − groups of NiAl-LDH and the -NH 3 + head groups of oleylamine are linked via electrostatic interaction 26 As an assistant surfactant, 1-butanol also plays an essential role in the reaction. The hydrophobic head groups of 1-butanol molecule are oriented towards the peripheral alkyl end groups of the reverse micelles, and intercalated among the long-chain alkyl tails of oleylamine via Van der Waals interaction.…”

Section: Resultsmentioning

confidence: 99%

Layered Double Hydroxide Nanoplatelets with Excellent Tribological Properties under High Contact Pressure as Water-Based Lubricant Additives

Wang

Liu

Chen

et al. 2016

Sci Rep

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High efficient and sustainable utilization of water-based lubricant is essential for saving energy. In this paper, a kind of layered double hydroxide (LDH) nanoplatelets is synthesized and well dispersed in water due to the surface modification with oleylamine. The excellent tribological properties of the oleylamine-modified Ni-Al LDH (NiAl-LDH/OAm) nanoplatelets as water-based lubricant additives are evaluated by the tribological tests in an aqueous environment. The modified LDH nanoplatelets are found to not only reduce the friction but also enhance the wear resistance, compared with the water-based cutting fluid and lubricants containing other particle additives. By adding 0.5 wt% LDH nanoplatelets, under 1.5 GPa initial contact pressure, the friction coefficient, scar diameter, depth and width of the wear track dramatically decrease by 83.1%, 43.2%, 88.5% and 59.5%, respectively. It is considered that the sufficiently small size and the excellent dispersion of NiAl-LDH/OAm nanoplatelets in water are the key factors, so as to make them enter the contact area, form a lubricating film and prevent direct collision of asperity peaks. Our investigations demonstrate that the LDH nanoplatelet as a water-based lubricant additive has a great potential value in industrial application.

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Section: Resultsmentioning

confidence: 99%

Layered Double Hydroxide Nanoplatelets with Excellent Tribological Properties under High Contact Pressure as Water-Based Lubricant Additives

Wang

Liu

Chen

et al. 2016

Sci Rep

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“…The reason leading to the huge difference in the bromate reduction at different pH could be attributed to electrostatic effects. Under the acidic condition, a large amount of H + ions might deposit on the surface of TiO 2 powder, which became relatively positive [35]. Anionic bromate ions might be attracted to the positive surface of TiO 2 , increasing the contact between bromate and the surface of TiO 2 , leading to the faster reduction kinetics under the acidic condition.…”

Section: Effect Of Ph On Bromate Reductionmentioning

confidence: 97%

Enhanced photocatalytic reduction of concentrated bromate in the presence of alcohols

Lin

Chen

et al. 2016

Chemical Engineering Journal

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“…In the seminal work by Fujishima and Honda in 1972 [4], water splitting to hydrogen and oxygen was demonstrated by irradiating TiO 2 electrode with UVA light in a photochemical cell. The photocatalytic activity of TiO 2 has been widely investigated ranging from controlled wettability of surfaces to selective conversion of CO 2 into fuels (CH 4 , CH 3 OH, HCHO and HCOOH) [5] TiO 2 nanostructures can also be used to generate hydrogen from water [6] and decomposition of organic molecules (pollutants) [7]. Additionally, the photocatalytic activity of TiO 2 can be modified by doping TiO 2 nanostructures with metals and nonmetals [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity of Multicompound TiO2/SiO2 Nanoparticles

et al. 2021

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Multicompound TiO2/SiO2 nanoparticles with a diameter of 50–70 nm were generated using a liquid flame spray (LFS) nanoparticle deposition in a single flame. Here, we study the photocatalytic activity of deposited multicompound nanoparticles in gas-phase via oxidation of acetylene into carbon dioxide that gives new insight about the multicompound nanoparticle morphology. A small addition of SiO2 content of 0.5%, 1.0% and 3.0% significantly suppressed the photocatalytic activity by 33%, 44% and 70%, respectively, whereas 5.0% SiO2 addition completely removed the activity. This may be due to a formation of a thin passivating SiO2 layer on top of the of the TiO2 nanostructures during the LFS nanoparticle deposition. Surface wetting results support this hypothesis with a significant increase in water contact angle as the SiO2 content is increased.

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Eco-efficient TiO2 modification for air pollutants oxidation

Cited by 31 publications

References 51 publications

Layered Double Hydroxide Nanoplatelets with Excellent Tribological Properties under High Contact Pressure as Water-Based Lubricant Additives

Layered Double Hydroxide Nanoplatelets with Excellent Tribological Properties under High Contact Pressure as Water-Based Lubricant Additives

Enhanced photocatalytic reduction of concentrated bromate in the presence of alcohols

Photocatalytic Activity of Multicompound TiO2/SiO2 Nanoparticles

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