Mesoporous (001)-TiO2 nanocrystals with tailored Ti3+ and surface oxygen vacancies for boosting photocatalytic selective conversion of aromatic alcohols

2021 ◽  
Vol 11 (8) ◽  
pp. 2939-2947
Author(s):  
Dianfeng Li ◽  
Jinguo Wang ◽  
Fengxia Xu ◽  
Nianchen Zhang ◽  
Yong Men
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Carbonyl Compounds ◽  
Oxygen Vacancies ◽  
Light Irradiation ◽  
Water Medium ◽  
Surface Oxygen ◽  
Tio2 Nanocrystals ◽  
Selective Conversion ◽  
Aromatic Alcohols

Mesoporous (001)-TiO2 nanocrystals with tailored Ti3+ and surface oxygen vacancies exhibited remarkably boosted photoactivity for selective conversion of aromatic alcohols to carbonyl compounds in water medium under visible-light irradiation.

Visible photostability of some ruthenium and platinum phthalocyanines in water and in the presence of organic substrates

2010 ◽  
Vol 14 (06) ◽  
pp. 499-508 ◽  
Author(s):  
Manuela Carchesio ◽  
Lucia Tonucci ◽  
Nicola d'Alessandro ◽  
Antonino Morvillo ◽  
Piero Del Boccio ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Carbonyl Compounds ◽  
Furfuryl Alcohol ◽  
Phenylacetic Acid ◽  
Water Soluble ◽  
Light Irradiation ◽  
Organic Substrates ◽  
Visible Spectra ◽  
Trapping Agent

Water-soluble, metal-tetrasubstituted phthalocyanines ( -SO3H , MPcS and -COOH , MPcC) of platinum and ruthenium were synthesized and their photostability to visible light irradiation was determined. For the ruthenium phthalocyanines, the characteristic visible Q band of the phthalocyanines was almost totally suppressed after five days of irradiation. The platinum derivatives were instead more resistant to photodegradation, and the Q band did not decrease by more than 25%. The addition of carbonyl compounds to the phthalocyanine solution in water (at concentrations at least 1400-fold those of the phthalocyanines) dramatically accelerated the photobleaching of these phthalocyanine complexes. PtPcS turned from blue to green and to colorless with one day of visible-light irradiation in the presence of acetone. This effect decreased with the increase in molecular weight of the ketones (from acetone to 2-pentanone). The addition of alcohols (i.e. 1-butanol) or other organics (i.e. phenylacetic acid) did not affect the photostability of these metal-tetrasubstituted phthalocyanines. Dioxygen also had an important role, as when the solutions of phthalocyanines were carefully deaerated before irradiation, the visible spectra were preserved. The platinum phthalocyanines, as with the palladium analogs, sensitize the photoproduction of 1O2 , as shown by the formation of endoperoxide and its rearranged products in the presence of furfuryl alcohol (a singlet oxygen trapping agent).

Oxygen vacancies enhance photocatalytic removal of NO over an N-doped TiO2 catalyst

2020 ◽  
Vol 10 (20) ◽  
pp. 6923-6934
Author(s):  
Xiaofang Tan ◽  
Guodong Qin ◽  
Gang Cheng ◽  
Xinjie Song ◽  
Xun Chen ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Oxygen Vacancies ◽  
Light Irradiation ◽  
Doped Tio2 ◽  
Tio2 Catalyst ◽  
Photocatalytic Removal

The proposed process of photocatalytically oxidizing NO into NO3− over N–TiO2 samples under visible light irradiation.

Ultrathin HNb3O8 nanosheets with oxygen vacancies for enhanced photocatalytic oxidation of amines under visible light irradiation

2019 ◽  
Vol 7 (10) ◽  
pp. 5493-5503 ◽  
Author(s):  
Junli Chen ◽  
Hai Wang ◽  
Zhiqiang Zhang ◽  
Lifeng Han ◽  
Yonghui Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Photocatalytic Oxidation ◽  
Oxygen Vacancies ◽  
Hydrothermal Process ◽  
Light Irradiation ◽  
Excellent Photocatalytic Activity ◽  
Simple Hydrothermal Process

Ultrathin HNb3O8 nanosheets with oxygen vacancies were successfully synthesized by a simple hydrothermal process. HNb3O8 NSs showed excellent photocatalytic activity.

Oxidative alkylation of alkenes with carbonyl compounds through concomitant 1,2-aryl migration by photoredox catalysis

2020 ◽  
Vol 44 (37) ◽  
pp. 16031-16035
Author(s):  
Zhaowei Lin ◽  
Maojian Lu ◽  
Boyi Liu ◽  
Jing Gao ◽  
Mingqiang Huang ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Carbonyl Compounds ◽  
Light Irradiation ◽  
Photoredox Catalysis ◽  
Diaryliodonium Salt ◽  
Oxidative Alkylation ◽  
Organic Fluorophore

An efficient protocol for the construction of 1,5-diketones was realized in the presence of organic fluorophore 4CzIPN, diaryliodonium salt, and visible light irradiation.

Band-gap engineering of BiOCl with oxygen vacancies for efficient photooxidation properties under visible-light irradiation

2018 ◽  
Vol 6 (5) ◽  
pp. 2193-2199 ◽  
Author(s):  
Dandan Cui ◽  
Liang Wang ◽  
Kang Xu ◽  
Long Ren ◽  
Li Wang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Visible Light ◽  
Band Gap ◽  
Visible Light Irradiation ◽  
Oxygen Vacancies ◽  
Light Irradiation ◽  
Good Strategy ◽  
Band Gap Engineering ◽  
The Creation

Engineering the electronic structure of BiOCl through the creation of oxygen vacancies can be a good strategy to enhance the photooxidation activity of BiOCl.

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