Photo-catalytic activity of hydrophilic-modified TiO 2 for the decomposition of methylene blue and phenol

Jun, Byeong; Woo, Tae Gyun; Park, Eun Ji; Kim, Il Hee; An, Jung Eun; Seo, Hyun Ook; Kim, Young Dok

doi:10.1016/j.cap.2017.07.002

Cited by 18 publications

(14 citation statements)

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“…In the O 1s core level spectra (Figure 1b), bare TiO 2 showed features of the lattice oxygen of TiO 2 at lower binding energies, as well as some hydroxyl groups on the surface at higher binding energies [29,30]. Upon PDMS coating, a peak centered at 531.5 eV became pronounced, originating from PDMS [29,30]. Upon subsequent annealing, peaks at higher binding energies corresponding to -OH, C=O can be observed, together with a small peak at 533 eV, attributed to SiO x due to the oxidation of Si atoms in PDMS [29,30].…”

Section: Characterizations Of Samplesmentioning

confidence: 99%

“…Bare TiO 2 should be free from any carbon in principle, yet some carbon impurities can always be found on samples that have been exposed to air. Carbon atoms observed on bare TiO 2 can be attributed to those in amorphous carbon structures with sp 2 or sp 3 hybridizations [28][29][30]. The C 1s signal of PDMS-coated TiO 2 can be attributed mostly to C atoms from the PDMS framework [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…Carbon atoms observed on bare TiO 2 can be attributed to those in amorphous carbon structures with sp 2 or sp 3 hybridizations [28][29][30]. The C 1s signal of PDMS-coated TiO 2 can be attributed mostly to C atoms from the PDMS framework [28][29][30]. The carbon impurities originally present on TiO 2 can be oxidized and removed during PDMS coating at 180 • C under air.…”

Section: Introductionmentioning

confidence: 99%

“…The carbon impurities originally present on TiO 2 can be oxidized and removed during PDMS coating at 180 • C under air. After vacuum annealing of the PDMS-coated TiO 2 , additional shoulders at higher binding energies appeared, which is indicative of the formation of C-OH and C=O [28][29][30]. Formation of such functional groups in the vacuum-annealed sample was verified by FT-IR measurements [28,31], which resulted in the improved hydrophilicity of h-TiO 2 compared to bare TiO 2 particles.…”

Section: Introductionmentioning

confidence: 99%

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Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

et al. 2018

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Titanium oxide (TiO2) nanostructures, the most widely used photocatalysts, are known to suffer from poisoning of the active sites during photocatalytic decomposition of volatile organic compounds. Partially oxidized organic compounds with low volatility stick to the catalyst surface, limiting the practical application for air purification. In this work, we studied the UV-driven photocatalytic activity of bare TiO2 toward toluene decomposition under various conditions and found that surface deactivation is pronounced either under dry conditions or humid conditions with a very high toluene concentration (~442 ppm). In contrast, when the humidity was relatively high (~34 %RH) and toluene concentration was low (~66 ppm), such deactivation was not significant. We then modified TiO2 surfaces by deposition of polydimethylsiloxane and subsequent annealing, which yielded a more hydrophilic surface. We provide experimental evidence that our hydrophilic TiO2 does not show deactivation under the conditions that induce significant deactivation with bare TiO2. Conversion of toluene into dimethylacetamide was observed on the hydrophilic TiO2 and did not result in poisoning of active sites. Our hydrophilic TiO2 shows high potential for application in air purification for extended time, which is not possible using bare TiO2 due to the significant poisoning of active sites.

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Section: Characterizations Of Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

et al. 2018

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“…[6][7][8][9][10][11][12][13] Of the various dopants used with CeO 2 , TiO 2 is one of the more promising, due to its photo-catalytic activity. [14][15][16][17][18][19][20][21] As such, considerable efforts have been devoted into the characterization of TiO 2 / CeO 2 mixed oxides and TiO 2 -rich compositions (X > 0.5) of Ce 1−x Ti x O 2 (solid solution). 15,[22][23][24][25][26][27][28][29] Periyat et al 25 showed that the addition of up to 10 mol.% of CeO 2 to TiO 2 increased the stability of the anatase phase, mostly by inhibiting coarsening.…”

Section: Introductionmentioning

confidence: 99%

Thermal stability of nano Ce_1−xTi_xO₂material system for X < 0.2

2019

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Ceria (CeO2) is a technologically promising compound due to a remarkable set of properties. However, the use of ceria also has drawbacks, the most pronounced of which is the material's poor thermal stability. This property limits the use of ceria‐based materials at elevated temperatures, in many technological applications. To overcome this, the addition of TiO2 is proposed. Such addition essentially creates a new material system, namely Ce1−xTixO2. In this work, an array of techniques were employed to determine the thermal stability of this new compound range (X < 0.2). Results show that when nano‐sized, TiO2 is fully soluble in CeO2 in this range. After heat treatment, however, the material coarsens and the solubility limit decreases to less than 2 at.%. as the compound undergoes significant changes. These include solute segregation and phase separation. Finally, the factors that affect compound stability are discussed.

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Toward the Application of Graphene for Combating Marine Biofouling

Jin

Tian

Bing

et al. 2020

Advanced Sustainable Systems

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The discovery of graphene has brought great innovations to materials science. Since tributyltin antifouling coatings were banned worldwide in 2008, the development of green antifouling coatings has become necessary. Recently, novel graphene‐related antifouling coatings have been the focus of many studies due to their enhanced mechanical strength, excellent antifouling capabilities, and environmental friendliness. This review starts by introducing the basic antifouling mechanisms of graphene nanosheets and the possible antifouling mechanisms when graphene is incorporated into coatings. Subsequently, the progress and existing problems regarding the application of graphene in the prevention of marine biofouling are discussed. Specifically, this review focuses on six graphene‐related antifouling coatings, including pure graphene film, nanohybrids, foul release coatings, photocatalytic nanocomposites, desalination membranes, and materials for uranium enrichment. The fabrication, antifouling properties, working mechanisms, and future development of graphene‐related antifouling coatings are highlighted. In addition, the potential environmental risk of using graphene materials in preventing marine biofouling is explained, and the basic requirements for designing an environmentally friendly graphene‐related antifouling coating are discussed. Finally, the prospect of applying graphene materials for combating marine biofouling is presented. This review aims to aid in improving the design of graphene‐related green antifouling coatings.

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Photo-catalytic activity of hydrophilic-modified TiO 2 for the decomposition of methylene blue and phenol

Cited by 18 publications

References 18 publications

Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

Thermal stability of nano Ce_1−xTi_xO₂material system for X < 0.2

Toward the Application of Graphene for Combating Marine Biofouling

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Photo-catalytic activity of hydrophilic-modified TiO 2 for the decomposition of methylene blue and phenol

Cited by 18 publications

References 18 publications

Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene

Thermal stability of nano Ce1−xTixO2 material system for X < 0.2

Toward the Application of Graphene for Combating Marine Biofouling

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Product

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Thermal stability of nano Ce_1−xTi_xO₂material system for X < 0.2