Molecular weight effects of PEG on the crystal structure and photocatalytic activities of PEG-capped TiO<sub>2</sub> nanoparticles

Zhang, Meizhou; Lei, Jinfeng; Shi, Yifeng; Zhang, Lina; Ye, Youxin; Li, Defu; Mu, Changdao

doi:10.1039/c6ra12988a

Cited by 22 publications

(17 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to produce improved materials with high surface area, several studies have focused on the synthesis of controlled porous TiO 2 -based materials with the addition of surfactants for the enhancement of photocatalytic activity [ 59 , 60 , 61 , 62 ]. Feng et al, reported enhanced metal-ion-doped TiO 2 photocatalysts under solar light with a large BET (Brunauer–Emmett–Teller) surface area, synthesized by microwave irradiation, through the use of the surfactant P123 [ 59 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

et al. 2022

View full text Add to dashboard Cite

In this study, polyethylene glycol-modified titanium dioxide (PEG-modified TiO2) nanopowders were prepared using a fast solvothermal method under microwave irradiation, and without any further calcination processes. These nanopowders were further impregnated on porous polymeric platforms by drop-casting. The effect of adding iron with different molar ratios (1, 2, and 5%) of iron precursor was investigated. The characterization of the produced materials was carried out by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Optical characterization of all the materials was also carried out. SEM showed that pure TiO2 and Fe-TiO2 nanostructures presented similar nanosized and spherical particles, which uniformly covered the substrates. From XRD, pure TiO2 anatase was obtained for all nanopowders produced, which was further confirmed by Raman spectroscopy on the impregnated substrates. XPS and UV–VIS absorption spectroscopy emission spectra revealed that the presence of Fe ions on the Fe-TiO2 nanostructures led to the introduction of new intermediate energy levels, as well as defects that contributed to an enhancement in the photocatalytic performance. The photocatalytic results under solar radiation demonstrated increased photocatalytic activity in the presence of the 5% Fe-TiO2 nanostructures (Rhodamine B degradation of 85% after 3.5 h, compared to 74% with pure TiO2 for the same exposure time). The photodegradation rate of RhB dye with the Fe-TiO2 substrate was 1.5-times faster than pure TiO2. Reusability tests were also performed. The approach developed in this work originated novel functionalized photocatalytic platforms, which were revealed to be promising for the removal of organic dyes from wastewater.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

et al. 2022

View full text Add to dashboard Cite

show abstract

“…We found that the dispersion of TiO 2 NPs in water was getting better with the increase of molecular weight of PEG. 16 However, PEG-capping would reduce the photocatalytic activity of TiO 2 NPs, which was detrimental to the transfer of photogenerated electrons and reactive oxygen species. 16 The photocatalytic activity of PEG-capped TiO 2 NPs would decrease with the growth of the PEG molecular chain.…”

Section: Resultsmentioning

confidence: 99%

“…TiO 2 NPs were prepared according to our previous method with a slight modification . Titanium butoxide (3 mL) was mixed with 6 g of PEG400 under magnetic stirring at 65 °C to form a white titanium alkoxide complex.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…TiO 2 NPs were prepared according to our previous method with a slight modification. 16 Titanium butoxide (3 mL) was mixed with 6 g of PEG400 under magnetic stirring at 65 °C to form a white titanium alkoxide complex. Then, 1 mL of HCl was added to the titanium alkoxide complex to get transparent slight yellow liquid.…”

Section: Methodsmentioning

confidence: 99%

“…In our previous work, a series of water-soluble TiO 2 NPs have been successfully prepared by PEG-capping. 16 In sum, the dissolubility of TiO 2 NPs in aqueous solutions can be effectively promoted by PEG-capping. However, PEG molecular chains capped on the surface of TiO 2 are detrimental to the transfer of photogenerated electrons and reactive oxygen species, resulting in passivation of the surface activity of TiO 2 NPs.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

One-Pot Approach for the Synthesis of Water-Soluble Anatase TiO₂ Nanoparticle Cluster with Efficient Visible Light Photocatalytic Activity

et al. 2018

Self Cite

View full text Add to dashboard Cite

Water contamination is one of the most serious problems today. Titanium dioxide (TiO 2 ) has received increasing attention on water decontamination. It will be a great contribution to fabricate water-soluble anatase TiO 2 nanoparticles with efficient visible light photocatalytic activity for water decontamination. Herein, we present a simple one-pot approach to synthesize a water-soluble anatase TiO 2 nanoparticle cluster with efficient visible light photocatalytic activity. PEG400 was used as a stabilizer to improve the aqueous dissolubility, while HCl was used to control the anatase phase of TiO 2 . In particular, titanium tetrachloride (TiCl 4 ) and titanium butoxide were cooperatively served as precursors of titanium. The results indicated that the crystals of TiO 2 were stacked together to form big crystal clusters cooperatively using TiCl 4 and titanium butoxide as precursors of titanium. The TiO 2 crystal cluster presented good aqueous dissolubility, and the anatase phase was successfully controlled. It is interesting that the UV− vis absorbance of aqueous solution of the TiO 2 crystal cluster was highly enhanced and expanded into the visible region. The TiO 2 crystal cluster possessed efficient photocatalytic activities both under UV and visible light irradiation. The water-soluble TiO 2 clusters have application prospect in water decontamination.

show abstract

Photochromic properties of novel composites on the base of biopolymers and plasma‐modified Mo₄O₁₁ and W₁₈O₄₉ nanostructures

Khlyustova,

Evdokimova,

Shibaeva

et al. 2023

Vinyl Additive Technology

View full text Add to dashboard Cite

Novel photochromic composites based on biopolymers (polyvinyl alcohol, starch) and Mo4O11 and W18O49 as the fillers were obtained and characterized. To improve the photochromic properties, molybdenum and tungsten oxide sols were treated by an underwater diaphragm discharge to obtain binary structures of the MoOx/WOx and WOx/MoOx (2 < x < 3) types. The formation of such oxides was confirmed by TEM, EDX, XRD analysis, and Raman spectroscopy data. Plasma treatment is increased the color intensity and reversibility. The modified sols were incorporated into polymer matrices. Spectral studies have shown that the color of photo‐colored composites depends on the chemical structure of the polymer matrix. Mechanical tests have shown the possibility of obtaining hardened or plastic composites depending on the concentration and nature of the filler.Highlights Photochromic polymer composites with W18O49 and Mo4O11 as fillers were obtained. Diaphragm discharge used as a tool for sol modification. WOx/MoOx and MoOx/WOx structures have improved photochromic properties. Color of irradiated polymer composites depends on chemical structure of polymer. Mechanical properties are determined by the polymer filler concentration.

show abstract

Molecular weight effects of PEG on the crystal structure and photocatalytic activities of PEG-capped TiO₂ nanoparticles

Abstract: The increasing molecular weight of PEG can increase the water dispersion but decrease the photocatalytic activity of PEG-capped TiO2.

Cited by 22 publications

References 34 publications

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

One-Pot Approach for the Synthesis of Water-Soluble Anatase TiO₂ Nanoparticle Cluster with Efficient Visible Light Photocatalytic Activity

Photochromic properties of novel composites on the base of biopolymers and plasma‐modified Mo₄O₁₁ and W₁₈O₄₉ nanostructures

Contact Info

Product

Resources

About

Molecular weight effects of PEG on the crystal structure and photocatalytic activities of PEG-capped TiO2 nanoparticles

Abstract: The increasing molecular weight of PEG can increase the water dispersion but decrease the photocatalytic activity of PEG-capped TiO2.

Cited by 22 publications

References 34 publications

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

Enhanced Fe-TiO2 Solar Photocatalysts on Porous Platforms for Water Purification

One-Pot Approach for the Synthesis of Water-Soluble Anatase TiO2 Nanoparticle Cluster with Efficient Visible Light Photocatalytic Activity

Photochromic properties of novel composites on the base of biopolymers and plasma‐modified Mo4O11 and W18O49 nanostructures

Contact Info

Product

Resources

About

Molecular weight effects of PEG on the crystal structure and photocatalytic activities of PEG-capped TiO₂ nanoparticles

One-Pot Approach for the Synthesis of Water-Soluble Anatase TiO₂ Nanoparticle Cluster with Efficient Visible Light Photocatalytic Activity

Photochromic properties of novel composites on the base of biopolymers and plasma‐modified Mo₄O₁₁ and W₁₈O₄₉ nanostructures