Visible light driven photocatalysis mediated via ligand-to-metal charge transfer (LMCT): an alternative approach to solar activation of titania

Zhang, Guan; Kim, Gonu; Choi, Wonyong

doi:10.1039/c3ee43147a

Cited by 403 publications

(252 citation statements)

References 118 publications

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“…In Figure 5a for instance, the bands around 3270 and 3387 cm −1 , (symmetric and asymmetric stretch of NH 2 in primary amides, respectively) decreased in intensity and shifted to higher wavenumbers after sEPS interacted with nTiO 2 . Similarly, the CO out-of-plane band in amides at around 598 cm 33,36,37 Interactions between sEPS and nTiO 2 occurred via amide, hydroxyl, and carboxylic groups of sEPS amino acids, as well as phosphate groups in phospholipids or nucleic acids. Emergence of a new COO − band and the disappearance of an O−CO group are consistent with inner sphere complexation of sEPS on nTiO 2 .…”

Section: Resultsmentioning

confidence: 99%

Interactions between Algal Extracellular Polymeric Substances and Commercial TiO₂ Nanoparticles in Aqueous Media

Adeleye

Keller

2016

Environ. Sci. Technol.

133

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The implications of engineered nanomaterials (ENMs) in the environment are often investigated using pristine particles. However, there are several biogenic and geogenic materials in natural waters that interact with and modify the surface of ENMs, thereby influencing their fate and effects. Here we studied the influence of soluble extracellular polymeric substances (sEPS) produced by freshwater and marine algae on the surface properties and fate of three commercial TiO 2 nanoparticles (nTiO 2 ) with different coatings. Adsorption of sEPS by the various nTiO 2 is dependent on particle surface area, intrinsic nTiO 2 surface charge, and hydrophobicity. Interactions between sEPS and nTiO 2 were driven by electrostatic interactions and chemical bonding (bridge-coordination) between the COO − group of sEPS and nTiO 2 . Charge reversal of positively charged nTiO 2 was observed at pH 7 in the presence of 0.5 mg-C/L sEPS. In addition, the critical coagulation concentration (CCC) of nTiO 2 increased in the presence of sEPSfrom both freshwater and marine sources. CCC of all nTiO2 increased as sEPS concentrations increased. This study shows that naturally occurring sEPS can modify the surface properties and fate of nTiO 2 in natural waters, and should be accounted for when predicting the fate and effects of engineered nanomaterials in the environment.

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Section: Resultsmentioning

confidence: 99%

Interactions between Algal Extracellular Polymeric Substances and Commercial TiO₂ Nanoparticles in Aqueous Media

Adeleye

Keller

2016

Environ. Sci. Technol.

133

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“…Due to the growing global energy crisis and environmental problems, heterogeneous photocatalysis has attracted considerable attention owing to its ability to purify water and air, and to split water with the use of solar light [1][2][3][4][5][6][7]. Conjugated polymer/TiO 2 photocatalysts hold great promise for solar chemical conversion processes by combining the advantages from both the conjugated polymer and the inorganic semiconductor, overcoming the serious drawbacks of fast charge recombination and the limited visible light absorption of inorganic semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Study on stability of poly(3-hexylthiophene)/titanium dioxide composites as a visible light photocatalyst

Zhang

Cao

et al. 2015

Applied Surface Science

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“…However, after incorporation, Sr 0.7 K 0.3 TiO 3− @ PC-polyHIPEs have excellent catalytic efficiency for MB degradation under visible light. The MB degradation rate can reach 56.5% after visible light irradiation for 20 min, −1 , as the number of reactive sites increases with rising catalyst concentration [28]. However, when the catalyst concentration reaches 2.4 g cat.…”

Section: The Photocatalyticmentioning

confidence: 99%

Enhanced Photodecomposition of Methylene Blue in Water with Sr_1−xK_xTiO_3−δ@PC-polyHIPEs under UV and Visible Light

Gao

Zhang

Guo

et al. 2018

Journal of Chemistry

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Photocatalytic method was investigated to remove water pollutant methylene blue (MB) produced in textile, plastic, and dye industries. PC-polyHIPEs were prepared by light-induced polymerization of dopamine in transparent polyHIPEs which were synthesized by polymerization within high internal phase emulsions. Sr 1− K TiO 3− ( = 0-0.5) nanoparticles were incorporated and adhered to PC-polyHIPEs to form Sr 1− K TiO 3− @PC-polyHIPEs for the first time. The catalysts were characterized by XRD, FTIR, TGA, UV-Vis DRS, and SEM and their photocatalytic properties for MB decomposition were measured over UV-Vis spectrometer. The PC-polyHIPEs were of interconnected porous structure with around 100 m pores and 30 m windows. Sr 1−x K x TiO 3− @PC-polyHIPEs showed excellent MB decomposition activity under either UV or visible light although Sr 1−x K x TiO 3− alone worked only under UV light. When = 0.3, Sr 1−x K x TiO 3− @PC-polyHIPEs showed the highest photocatalytic performance due to the existence of more oxygen vacancies. When the water solution with 50 mg L −1 MB and 1.6 g cat. L −1Sr 0.7 K 0.3 TiO 3− @PC-polyHIPEs was exposed to visible light for 160 min at room temperature, 88.3% of MB was decomposed. After being used for eight cycles, 87.6% activity of fresh Sr 0.7 K 0.3 TiO 3− @PC-polyHIPEs still remained. The influences of salinity, temperature, and catalyst concentration on the catalytic activity were studied. For MB decomposition under visible light, the activation energy of Sr 0.7 K 0.3 TiO 3− @PC-polyHIPEs was calculated to be 12.3 kJ mol −1 and the kinetics analysis revealed that the photocatalysis followed the second-order reaction. These findings demonstrated that Sr 1−x K x TiO 3− @PC-polyHIPEs were an effective candidate for real application in decomposition of MB in water.

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Visible light driven photocatalysis mediated via ligand-to-metal charge transfer (LMCT): an alternative approach to solar activation of titania

Abstract: Choi et al. Visible light driven photocatalysis mediated via ligand-to-metal charge transfer (LMCT): an alternative approach to solar activation of titania

Cited by 403 publications

References 118 publications

Interactions between Algal Extracellular Polymeric Substances and Commercial TiO₂ Nanoparticles in Aqueous Media

Interactions between Algal Extracellular Polymeric Substances and Commercial TiO₂ Nanoparticles in Aqueous Media

Study on stability of poly(3-hexylthiophene)/titanium dioxide composites as a visible light photocatalyst

Enhanced Photodecomposition of Methylene Blue in Water with Sr_1−xK_xTiO_3−δ@PC-polyHIPEs under UV and Visible Light

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Visible light driven photocatalysis mediated via ligand-to-metal charge transfer (LMCT): an alternative approach to solar activation of titania

Abstract: Choi et al. Visible light driven photocatalysis mediated via ligand-to-metal charge transfer (LMCT): an alternative approach to solar activation of titania

Cited by 403 publications

References 118 publications

Interactions between Algal Extracellular Polymeric Substances and Commercial TiO2 Nanoparticles in Aqueous Media

Interactions between Algal Extracellular Polymeric Substances and Commercial TiO2 Nanoparticles in Aqueous Media

Study on stability of poly(3-hexylthiophene)/titanium dioxide composites as a visible light photocatalyst

Enhanced Photodecomposition of Methylene Blue in Water with Sr1−xKxTiO3−δ@PC-polyHIPEs under UV and Visible Light

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Product

Resources

About

Interactions between Algal Extracellular Polymeric Substances and Commercial TiO₂ Nanoparticles in Aqueous Media

Interactions between Algal Extracellular Polymeric Substances and Commercial TiO₂ Nanoparticles in Aqueous Media

Enhanced Photodecomposition of Methylene Blue in Water with Sr_1−xK_xTiO_3−δ@PC-polyHIPEs under UV and Visible Light