scholarly journals A novel visible-light-driven TiO2 photocatalytic reduction for hexavalent chromium wastewater and mechanism

2021 ◽  
Author(s):  
Baoxiu Zhao ◽  
Kaixin Zhang ◽  
Yue Huang ◽  
Qi Wang ◽  
Hao Xu ◽  
...  
Keyword(s):  
Visible Light ◽  
Self Assembly ◽  
Ph Value ◽  
Sol Gel ◽  
Photocatalytic Reduction ◽  
Complex Catalyst ◽  
Acidic Aqueous Solution ◽  
Visible Light Driven ◽  
Key Steps

Abstract TiO2 photocatalyst was prepared with a sol-gel method and its characterizations were analyzed, then TiO2 photocatalytic reduction for Cr6+ was investigated in visible light irradiation and reduction mechanism were deduced lastly. Prepared TiO2 is anatase and bandgap is about 2.95 eV. Experimental results display that almost 100% Cr6+ is removed by visible-light-driven TiO2 photocatalytic reduction after 120 min when Cr2O72− initial concentration is 1.0 mg·L−1, TiO2 dosage is 1.0 g·L−1 and pH value is 3. In acidic aqueous solution, HCrO4− is the dominant existing form of Cr6+ and adsorbed by TiO2, forming a complex catalyst HCrO4−/TiO2 which wavelength enlarges to visible light zone, proved by UV-Vis DRS. Based on XPS data, it can be deduced that Cr6+ is adsorbed on the surface of TiO2 and then reduced to Cr3+in situ by photoelectrons. Self-assembly of HCrO4−/TiO2 complex catalyst and self-reduction of Cr6+in situ are the key steps to start visible-light-driven TiO2 photocatalytic reduction. Furthermore, TiO2 photocatalytic reduction for Cr6+ fits well with pseudo first-order kinetics and has potential application to treat chemical industrial wastewater.

scholarly journals In situ self-assembly of zirconium metal–organic frameworks onto ultrathin carbon nitride for enhanced visible light-driven conversion of CO2 to CO

2020 ◽  
Vol 8 (12) ◽  
pp. 6034-6040 ◽  
Author(s):  
Yanan Wang ◽  
Wenlong Zhen ◽  
Yiqing Zeng ◽  
Shipeng Wan ◽  
Haiwei Guo ◽  
...  
Keyword(s):  
Visible Light ◽  
Self Assembly ◽  
Carbon Nitride ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Assembly Method ◽  
Visible Light Driven ◽  
Metal Organic ◽  
Zirconium Metal

A series of Zr-porphyrin metal–organic framework (Zr-PMOF)/ultrathin g-C3N4 (UCN) heterostructure photocatalysts, as stable and efficient catalysts for the photoreduction of CO2, have been fabricated via a facile in situ hydrothermal self-assembly method.

Triphenylamine and terpyridine–zinc(ii) complex based donor–acceptor soft hybrid as a visible light-driven hydrogen evolution photocatalyst

2020 ◽  
Vol 8 (42) ◽  
pp. 21968-21972
Author(s):  
Debabrata Samanta ◽  
Manish Kumar ◽  
Sugandha Singh ◽  
Parul Verma ◽  
Kamal K. Kar ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Self Assembly ◽  
Visible Light Driven ◽  
Donor Acceptor

A donor–acceptor coordination polymer (TPA-Zn) was synthesized by Zn(ii)-assisted self-assembly of an in situ generated triphenylamine (TPA) cored tristerpyridine ligand.

Photogenerated electron reservoir in hetero-p–n CuO–ZnO nanocomposite device for visible-light-driven photocatalytic reduction of aqueous Cr(vi)

2015 ◽  
Vol 3 (3) ◽  
pp. 1199-1207 ◽  
Author(s):  
Jianyu Yu ◽  
Shendong Zhuang ◽  
Xiaoyong Xu ◽  
Wenchang Zhu ◽  
Bing Feng ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrothermal Reaction ◽  
Photogenerated Electron ◽  
Photocatalytic Reduction ◽  
Visible Light Driven ◽  
Cu Foil ◽  
Visible Light Photocatalytic

A 3D CuO–ZnO p–n junction hierarchical device was fabricated via sequential in situ crystallization and hydrothermal reaction on Cu foil and exhibited enhanced visible light photocatalytic reduction with stable recyclability to Cr(vi).

scholarly journals Nonhydrolytic sol-gel in-situ synthesis of novel recoverable amorphous Fe2TiO5/C hollow spheres as visible-light driven photocatalysts

2020 ◽  
Vol 194 ◽  
pp. 108928
Author(s):  
Qianqian Zhao ◽  
Guo Feng ◽  
Feng Jiang ◽  
Shanfang Lan ◽  
Junhua Chen ◽  
...  
Keyword(s):  
Visible Light ◽  
Sol Gel ◽  
Hollow Spheres ◽  
In Situ Synthesis ◽  
Visible Light Driven

A visible-light driven Bi2S3@ZIF-8 core–shell heterostructure and synergistic photocatalysis mechanism

2018 ◽  
Vol 47 (3) ◽  
pp. 684-692 ◽  
Author(s):  
Yan-Hua Ding ◽  
Xiao-Lei Zhang ◽  
Na Zhang ◽  
Jian-Yong Zhang ◽  
Rui Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Self Assembly ◽  
Light Irradiation ◽  
Core Shell ◽  
Visible Light Driven ◽  
Degussa P25

A series of Bi2S3@ZIF-8 core–shell heterostructures has been synthesized using in situ self-assembly, which exhibit enhanced photocatalytic degradation of Rhodamine B under visible-light irradiation, reaching 25.3 times that observed for pristine Bi2S3 and 26.7 times that found for commercial Degussa P25.

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