scholarly journals Visible-Light Photodegradation of Dye on Co-Doped Titania Nanotubes Prepared by Hydrothermal Synthesis

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Jung-Pin Wang ◽  
Hsi-Chi Yang ◽  
Chien-Te Hsieh
Keyword(s):  
Photocatalytic Activity ◽  
Liquid Phase ◽  
Visible Light ◽  
Band Gap ◽  
Optical Band Gap ◽  
Titania Nanotubes ◽  
High Porosity ◽  
Fluorescent Lamp ◽  
Doped Titania ◽  
Co Doped

Highly porous Co-doped TiO2nanotubes synthesized from a hydrothermal treatment were used to photodecompose methylene blue (MB) in liquid phase under visible light irradiation. The anatase-type titania nanotubes were found to have high specific surface areas of about 289–379 m2/g. These tubes were shown to be hollow scrolls with outer diameter of about 10–15 nm and length of several micrometers. UV absorption confirmed that Co doping makes the light absorption of nanotubes shift to visible light region. With increasing the dopant concentration, the optical band gap of nanotubes became narrower, ranging from 2.4 eV to 1.8 eV, determined by Kubelka-Munk plot. The Co-doped nanotubes exhibit not only liquid-phase adsorption ability, but also visible-light-derived photodegradation of MB in aqueous solution. The synergetic effect involves two key factors in affecting the photocatalytic activity of Co-doped titania nanotubes under fluorescent lamp, that is, high porosity and optical band gap. The merit of the present work is to provide an efficient route for preparing Co-doped TiO2nanotubes and to clarifying their adsorption and photocatalytic activity under fluorescent lamp.

Quantum dots in photocatalytic applications: efficiently enhancing visible light photocatalytic activity by integrating CdO quantum dots as sensitizers

2017 ◽  
Vol 19 (36) ◽  
pp. 24915-24927 ◽  
Author(s):  
A. H. Reshak
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Visible Light Irradiation ◽  
Photocatalytic Performance ◽  
Optical Band Gap ◽  
Visible Light Active ◽  
Photocatalytic Applications ◽  
Visible Light Photocatalytic

The amalgamation of a wide optical band gap photocatalyst with visible-light-active CdO quantum dots (QDs) as sensitizers is one of the most efficient ways to improve photocatalytic performance under visible light irradiation.

Structure of Nitrogen and Zirconium Co-Doped Titania with Enhanced Visible-Light Photocatalytic Activity

2014 ◽  
Vol 6 (7) ◽  
pp. 4622-4629 ◽  
Author(s):  
Peng Zhang ◽  
Yanlong Yu ◽  
Enjun Wang ◽  
Jingsheng Wang ◽  
Jianghong Yao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Photocatalytic Activity ◽  
Doped Titania ◽  
Co Doped ◽  
Visible Light Photocatalytic

Ni, Co and Ni–Co codoping induced modification in shape, optical band gap and enhanced photocatalytic activity of CeO2 nanostructures for photodegradation of methylene blue dye under visible light irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 8651-8660 ◽  
Author(s):  
Sachin Kumar ◽  
Animesh K. Ojha
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Visible Light Irradiation ◽  
Recombination Rate ◽  
Optical Band Gap ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Photo Degradation

The recombination rate of photo-induced electrons and holes for Ni–Co codoped CeO2 nanostructures is reduced significantly, which essentially improve the photocatalytic activity for photo-degradation of MB dye.

Amorphous co-doped MoSex effectively enhances photocatalysis in visible light

2020 ◽  
Vol 49 (22) ◽  
pp. 7451-7458
Author(s):  
Rui Feng ◽  
Rong Wu ◽  
Yuncheng Cao ◽  
Xiaolin Guo ◽  
Xu Ma
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Light Response ◽  
Response Range ◽  
Co Doped

Amorphous co-doped MoSex enhances photocatalytic activity. There are three types of unsaturated Se–Se bonds in Co-MoSex: bridging Se–Se, shared Se–Se and terminal Se–Se. The band gap of Co-MoSex was reduced and the light response range was expanded.

Nonporous Nitrogen and Ruthenium Co-Doped Titania Films for Photocatalysis

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940043 ◽  
Author(s):  
O. Linnik ◽  
L. Khoroshko
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Structural Properties ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Gel Technique ◽  
Titania Films ◽  
Doped Titania ◽  
Co Doped

Nitrogen and ruthenium co-doped titania films synthesized by sol–gel technique exhibit high photocatalytic activity under both UV and visible light. Incorporation of nitrogen and ruthenium ions in titania lattice is proven by XPS. Both doping agents affected the structural properties of the films.

scholarly journals Synthesis of Fe- and Co-Doped TiO2 with Improved Photocatalytic Activity Under Visible Irradiation Toward Carbamazepine Degradation

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3874 ◽  
Author(s):  
Abderrahim El Mragui ◽  
Yuliya Logvina ◽  
Luís Pinto da Silva ◽  
Omar Zegaoui ◽  
Joaquim C.G. Esteves da Silva
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance Spectroscopy ◽  
Anatase Phase ◽  
Aqueous Suspension ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Doped Tio2 ◽  
Doped Titania ◽  
Co Doped

Pure TiO2 and Fe- and Co-doped TiO2 nanoparticles (NPs) as photocatalysts were synthesized using wet chemical methods (sol-gel + precipitation). Their crystalline structure and optical properties were analyzed using X-ray diffraction (XRD), Raman spectroscopy and Fourier-transform infrared (FTIR) spectroscopy, ultraviolet-visible light (UV-Vis) diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The photocatalytic activity of the synthesized nanoparticles was evaluated through degradation of carbamazepine (CBZ) under UV-A and visible-light irradiations. The XRD and Raman analyses revealed that all synthesized nanomaterials showed only the anatase phase. The DRS results showed that the absorption edge was blue-shifted for Fe-doped TiO2 NPs. The decrease in charge recombination was evidenced from the PL investigation for both Co-doped and Fe-doped TiO2 nanomaterials. An enhancement in photocatalytic degradation of carbamazepine in aqueous suspension under both UV-A light and visible-light irradiations was observed for Fe-doped Titania NPs by comparison with pure TiO2. These results suggest that the doping cations could suppress the electron/hole recombination. Therefore, the photocatalytic activity of TiO2-based nanomaterials was enhanced.

scholarly journals Towards high visible light photocatalytic activity in rare earth and N co-doped SrTiO3: a first principles evaluation and prediction

RSC Advances ◽  
2017 ◽  
Vol 7 (27) ◽  
pp. 16282-16289 ◽  
Author(s):  
Chao Zhang ◽  
Nan Jiang ◽  
Shiai Xu ◽  
Zheng Li ◽  
Xingliang Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rare Earth ◽  
Band Structure ◽  
Visible Light ◽  
Band Gap ◽  
First Principles ◽  
First Principles Calculations ◽  
Visible Light Photocatalytic Activity ◽  
Co Doped ◽  
Visible Light Photocatalytic

The band structure and photocatalytic activity of RE (La, Ce, Pr or Nd) mono-doped and RE–N co-doped SrTiO3 for band gap reduction are studied systematically using first principles calculations.

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