Enhanced photocatalytic reduction reaction over Bi3+–TiO2 nanoparticles in presence of formic acid as a hole scavenger

Chemosphere ◽  
2007 ◽  
Vol 66 (5) ◽  
pp. 930-938 ◽  
Author(s):  
S. Rengaraj ◽  
X.Z. Li
Keyword(s):  
Formic Acid ◽  
Tio2 Nanoparticles ◽  
Reduction Reaction ◽  
Photocatalytic Reduction ◽  
Hole Scavenger

scholarly journals Photocatalytic Reduction of Hexavalent Chromium with Nanosized TiO2 in Presence of Formic Acid

2019 ◽  
Vol 3 (2) ◽  
pp. 33 ◽  
Author(s):  
Jahida Binte Islam ◽  
Mai Furukawa ◽  
Ikki Tateishi ◽  
Hideyuki Katsumata ◽  
Satoshi Kaneco
Keyword(s):  
Titanium Dioxide ◽  
Formic Acid ◽  
Tio2 Nanoparticles ◽  
Hexavalent Chromium ◽  
Oxidation Reaction ◽  
Photocatalytic Reduction ◽  
Nanosized Titanium Dioxide ◽  
Hole Scavenger ◽  
Nanosized Tio2 ◽  
Commercial Tio2

Nanosized titanium dioxide (TiO2) nanoparticles were used for the photocatalytic reduction of hexavalent chromium in the presence of formic acid. The photoreduction of Cr(VI) in the absence of formic acid was quite slow. When formic acid was added in the chromium solution as the hole scavenger, a rapid photocatalytic reduction of Cr(VI) was observed, owing to the consumption of hole and the acceleration of the oxidation reaction. Furthermore, three commercial TiO2 nanoparticles (AEROXIDE® P25; Ishihara Sangyo ST-01; FUJIFILM Wako Pure Chemical Corp.) were evaluated for the photoactivity of reduction of Cr(VI).

Simultaneous Cr(VI) Reduction and Naphthalene Oxidation in Aqueous Solutions by UV/TiO2

2007 ◽  
Vol 1045 ◽  
Author(s):  
Ricardo Guitierrez ◽  
Sergio o Flores ◽  
Omar Rios ◽  
Miguel Valenzuela
Keyword(s):  
Uv Light ◽  
Reaction Rates ◽  
Reduction Reaction ◽  
Photocatalytic Reduction ◽  
Photochemical Oxidation ◽  
Single System ◽  
Photochemical Reduction ◽  
Photogenerated Electrons ◽  
Hole Scavenger ◽  
Naphthalene Oxidation

AbstractThe photocatalytic reduction of Cr (VI) and oxidation of naphthalene using UV light and TiO2 were investigated with variations in the pH and Cr (VI)/naphthalene ratio. The photochemical reduction of Cr (VI) single system was not observed, whereas the photochemical oxidation of naphthalene was significantly high. However, the reduction reaction rates of Cr (VI) and oxidation of naphthalene were improved in the system UV/TiO2. The removal of Cr (VI) decreased dramatically with increasing pH, in contrast, the naphthalene removal was not influenced by the pH. The presence of naphthalene functioned as a hole scavenger enhancing the photocatalytic reduction of Cr (VI) by the photogenerated electrons, while the removal of naphthalene was decreasing at increasing Cr (VI) content.

Photocatalytic Reduction of Nitrate in Wastewater Using ZnO Nanopowder Synthesized by Solution Combustion Method

2007 ◽  
Vol 7 (11) ◽  
pp. 4069-4072 ◽  
Author(s):  
Sung Park ◽  
Hee-Joon Kim ◽  
Jong Soo Kim ◽  
Kang Yoo ◽  
Jae Chun Lee ◽  
...  
Keyword(s):  
Combustion Method ◽  
Reduction Reaction ◽  
Photocatalytic Reduction ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Zno Nanopowder ◽  
Hole Scavenger ◽  
Toxic Pollutant ◽  
Unique Method ◽  
Drinking Water Purification

ZnO nanopowder was synthesized by a unique method which is called solution combustion method (SCM). This nanopowder was used for a photocatalyst to decompose nitrate that is a toxic pollutant in wastewater. It has been known that TiO2, the most popular photocatalyst, does not decompose the nitrate. In this paper, however, the SCM ZnO nanopowder decomposed about 13% of nitrate. Furthermore, adding methanol as a hole scavenger, the decomposition rate was enhanced by about 5 times. On the other hand, it has been reported that the photocatalytic reduction reaction of nitrate produces ammonia as a final product. The present results, however, suggest that the final product is non-toxic nitrogen gas rather than the toxic ammonia. These results would be very valuable for drinking water purification.

Enhanced photocatalytic reduction of aqueous Pb(II) over Ag loaded TiO2with formic acid as hole scavenger

2012 ◽  
Vol 47 (3) ◽  
pp. 327-336 ◽  
Author(s):  
Liyuan Li ◽  
Fang Jiang ◽  
Jingliang Liu ◽  
Haiqin Wan ◽  
Yuqiu Wan ◽  
...  
Keyword(s):  
Formic Acid ◽  
Photocatalytic Reduction ◽  
Hole Scavenger

scholarly journals Nitric oxide emission during the reductive heterogeneous photocatalysis of aqueous nitrate with TiO2

RSC Advances ◽  
2015 ◽  
Vol 5 (104) ◽  
pp. 85319-85322 ◽  
Author(s):  
V. Nahuel Montesinos ◽  
Natalia Quici ◽  
Hugo Destaillats ◽  
Marta I. Litter
Keyword(s):  
Nitric Oxide ◽  
Formic Acid ◽  
Nitrogen Dioxide ◽  
Heterogeneous Photocatalysis ◽  
Photocatalytic Reduction ◽  
Nitric Oxide Emission ◽  
Hole Scavenger ◽  
First Time

For the first time, nitric oxide (NO), a precursor of nitrogen dioxide (a NIOSH-listed pollutant), has been found to be one of the final products of the photocatalytic reduction of nitrate in water using TiO2 and formic acid as a hole scavenger.

Carbon nitride derivatives as photocatalysts for the CO2 reduction reaction: computational study

2021 ◽  
Vol 23 (5) ◽  
pp. 3401-3406
Author(s):  
Siru Li ◽  
Yu Tian ◽  
Likai Yan ◽  
Zhongmin Su
Keyword(s):  
Carbon Nitride ◽  
Computational Study ◽  
Co2 Reduction ◽  
Environmental Problems ◽  
Reduction Reaction ◽  
Photocatalytic Reduction ◽  
Energy Crisis ◽  
Promising Strategy ◽  
Co2 Reduction Reaction

Photocatalytic reduction of CO2 to hydrocarbons is considered to be a promising strategy to solve the energy crisis and environmental problems.

Electro-catalysis of carbon black or titanium sub-oxide supported Pd–Gd towards formic acid electro-oxidation

RSC Advances ◽  
2016 ◽  
Vol 6 (73) ◽  
pp. 68989-68996 ◽  
Author(s):  
Nan He ◽  
Chuanguang Qin ◽  
Rumin Wang ◽  
Shuhui Ma ◽  
Yi Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Carbon Black ◽  
Formic Acid ◽  
Sodium Borohydride ◽  
Weight Percent ◽  
Reduction Reaction ◽  
Simultaneous Reduction ◽  
Electro Catalysis ◽  
Electro Oxidation ◽  
Supported Pd

Carbon black supported Pd–Gd catalysts (Pd–xGd/C, x is weight percent in catalyst) with different amounts of Gd were prepared by a simultaneous reduction reaction with sodium borohydride in aqueous solution.

scholarly journals High Pressure Photoreduction of CO2: Effect of Catalyst Formulation, Hole Scavenger Addition and Operating Conditions

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 430 ◽  
Author(s):  
Elnaz Bahadori ◽  
Antonio Tripodi ◽  
Alberto Villa ◽  
Carlo Pirola ◽  
Laura Prati ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Formic Acid ◽  
Gas Phase ◽  
Operating Conditions ◽  
Flame Spray ◽  
Co2 Solubility ◽  
Total Consumption ◽  
Solubility In Water ◽  
Hole Scavenger ◽  
Fuels And Chemicals

The photoreduction of CO2 is an intriguing process which allows the synthesis of fuels and chemicals. One of the limitations for CO2 photoreduction in the liquid phase is its low solubility in water. This point has been here addressed by designing a fully innovative pressurized photoreactor, allowing operation up to 20 bar and applied to improve the productivity of this very challenging process. The photoreduction of CO2 in the liquid phase was performed using commercial TiO2 (Evonink P25), TiO2 obtained by flame spray pyrolysis (FSP) and gold doped P25 (0.2 wt% Au-P25) in the presence of Na2SO3 as hole scavenger (HS). The different reaction parameters (catalyst concentration, pH and amount of HS) have been addressed. The products in liquid phase were mainly formic acid and formaldehyde. Moreover, for longer reaction time and with total consumption of HS, gas phase products formed (H2 and CO) after accumulation of significant number of organic compounds in the liquid phase, due to their consecutive photoreforming. Enhanced CO2 solubility in water was achieved by adding a base (pH = 12–14). In basic environment, CO2 formed carbonates which further reduced to formaldehyde and formic acid and consequently formed CO/CO2 + H2 in the gas phase through photoreforming. The deposition of small Au nanoparticles (3–5 nm) (NPs) onto TiO2 was found to quantitatively influence the products distribution and increase the selectivity towards gas phase products. Significant energy storage in form of different products has been achieved with respect to literature results.

scholarly journals A Facile Platform for Photocatalytic Reduction of Methylene Blue Dye By CdSe-TiO2 Nanoparticles

2017 ◽  
Vol 2 (2) ◽  
pp. 43-50 ◽  
Author(s):  
Irshad Ahmad Mir ◽  
Inderjeet Singh ◽  
Balaji Birajdar ◽  
Kamla Rawat
Keyword(s):  
Methylene Blue ◽  
Tio2 Nanoparticles ◽  
Photocatalytic Reduction ◽  
Blue Dye ◽  
Methylene Blue Dye
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