Photocatalytic Reduction and Immobilization of Hexavalent Chromium at Titanium Dioxide in Aqueous Basic Media

1993 ◽  
Vol 140 (9) ◽  
pp. 2477-2482 ◽  
Author(s):  
Wen‐Yuan Lin ◽  
Chang Wei ◽  
Krishnan Rajeshwar
Keyword(s):  
Titanium Dioxide ◽  
Hexavalent Chromium ◽  
Photocatalytic Reduction

Photocatalytic reduction behavior of hexavalent chromium on hydroxyl modified titanium dioxide

2017 ◽  
Vol 206 ◽  
pp. 293-299 ◽  
Author(s):  
Yali Li ◽  
Yingying Bian ◽  
Hongxia Qin ◽  
Yaxi Zhang ◽  
Zhenfeng Bian
Keyword(s):  
Titanium Dioxide ◽  
Hexavalent Chromium ◽  
Photocatalytic Reduction ◽  
Reduction Behavior

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).

scholarly journals Impacts of Mixing Mode on Photocatalytic Reduction of Hexavalent Chromium over Titanium Dioxide Nanomaterial under Various Environmental Conditions

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2291
Author(s):  
Chih-Chi Yang ◽  
Khanh-Chau Dao ◽  
Yo-Sheng Lin ◽  
Teng-Yun Cheng ◽  
Ku-Fan Chen ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Hexavalent Chromium ◽  
Species Distribution ◽  
Uv Light ◽  
Photocatalytic Reduction ◽  
Oxygen Effect ◽  
Strong Interactions ◽  
Nitrogen Gas ◽  
Key Factor ◽  
Hole Scavenger

This study explores the effects of initial Cr(VI) concentration, wavelength, hole-scavenger (absence and presence of salicylic acid), and oxygen conditions (aeration by air, nitrogen gas, and mechanical stir only) on photocatalytic reduction of hexavalent chromium over titanium dioxide photocatalyst and the chromic species distribution after photocatalysis. The experimental results show the existence of strong interactions between these factors. The factor of hole-scavenger was more important than the UV light wavelength condition for a reduction of 3 mg Cr(VI) L−1, whereas both factors became important when Cr(VI) concentration increased to 20 mgL−1. The higher the UV wavelength was, the less the amount of chromium retained on the TiO2 surface. The influence of oxygen-containing conditions in the solution on the reduction of 3 mgL−1 Cr(VI) was unobvious, whereas its influence became remarkable for the reduction of 20 mgL−1 Cr(VI) in the presence of SA. The interaction between oxygen-containing factor and other environmental factors, such as Cr(VI) concentration and scavenger presence (SA in this study), is a key factor about the degree of oxygen effect on Cr(VI) photo-reduction and the chromic species distribution. Simple stirring obtained better photocatalytic efficiency than aeration by air or nitrogen gas.

Zr-Based MOFs as new photocatalysts for the rapid reduction of Cr(vi) in water

2020 ◽  
Vol 44 (17) ◽  
pp. 7218-7225 ◽  
Author(s):  
Haimei Xie ◽  
Duomou Ma ◽  
Wanyan Liu ◽  
Qian Chen ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Photocatalytic Reduction ◽  
Rapid Reduction

The hydroxyl modified Zr-based MOFs is used for photocatalytic reduction of hexavalent chromium existing in wastewater.

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