Synergistic Effect in Photocatalysis As Observed for Mixed-Phase Nanocrystalline Titania Processed via Sol−Gel Solvent Mixing and Calcination

2008 ◽  
Vol 112 (30) ◽  
pp. 11345-11356 ◽  
Author(s):  
A. Zachariah ◽  
K. V. Baiju ◽  
S. Shukla ◽  
K. S. Deepa ◽  
J. James ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Sol Gel ◽  
Mixed Phase ◽  
Nanocrystalline Titania

Synergistic Effect of Eu3+ and Sm3+ Co-Doping on Photocatalytic Activity of TiO2 Nanoparticles

2011 ◽  
Vol 197-198 ◽  
pp. 891-894 ◽  
Author(s):  
Cheng Zhi Jiang ◽  
Xu Dong Lu
Keyword(s):  
Photocatalytic Activity ◽  
Synergistic Effect ◽  
Sol Gel ◽  
Blue Shift ◽  
Nano Particles ◽  
Absorption Profile ◽  
Co Doping ◽  
The Matrix ◽  
Co Doped ◽  
The Eu

Pure TiO2, Eu3+and Sm3+co-doping TiO2composite nanoparticles have been prepared by sol-gel method and characterized by the techniques such as XRD, SEM and DRS. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate their photocatalytic activity. The matrix distortion of TiO2nano-particles increases after co-doping of Eu3+and Sm3+and a blue-shift of the absorption profile are clearly observed. The results show that co-doping of Eu3+and Sm3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. The Eu3+and Sm3+co-doped into TiO2nano-particles exert a synergistic effect on their photocatalytic activity.

Preparation and Photocatalytic Activity of Mixed Phase Anatase/rutile TiO2 Nanoparticles for Phenol Degradation

2014 ◽  
Vol 70 (2) ◽  
Author(s):  
Mohamad Azuwa Mohamed ◽  
Wan Norharyati Wan Salleh ◽  
Juhana Jaafar ◽  
Norhaniza Yusof
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
High Performance ◽  
Sol Gel ◽  
Phenol Degradation ◽  
Chemical Properties ◽  
Mixed Phase ◽  
Rutile Tio2 ◽  
Physico Chemical ◽  
Degussa P25

The evolution of desirable physico-chemical properties in high performance photocatalyst materials involves steps that must be carefully designed, controlled, and optimized. This study investigated the role of key parameter in the preparation and photocatalytic activity analysis of the mixed phase of anatase/rutile TiO2 nanoparticles, prepared via sol-gel method containing titanium-n-butoxide Ti(OBu)4 as a precursor material, nitric acid as catalyst, and isopropanol as solvent. The prepared TiO2 nanoparticles were characterized by means of XRD, SEM, and BET analyses, and UV-Vis-NIR spectroscopy. The results indicated that the calcination temperature play an important role in the physico-chemical properties and photocatalytic activity of the resulting TiO2 nanoparticles. Different calcination temperatures would result in different composition of anatase and rutile. The photocatalytic activity of the prepared mixed phase of anatase/rutile TiO2 nanoparticles was measured by photodegradation of 50 ppm phenol in an aqueous solution. The commercial anatase from Sigma-Aldrich and Degussa P25 were used for comparison purpose. The mixed phase of anatase/rutile TiO2 nanoparticles (consists of 38.3% anatase and 61.7% rutile) that was prepared at 400°C exhibited the highest photocatalytic activity of 84.88% degradation of phenol. The result was comparable with photocatalytic activity demonstrated by Degussa P25 by 1.54% difference in phenol degradation. The results also suggested that the mixed phase of anatase/rutile TiO2 nanoparticles is a promising candidate for the phenol degradation process. The high performance of photocatalyst materials may be obtained by adopting a judicious combination of anatase/rutile and optimized calcination conditions.

MgMoO4 as an anode material for lithium ion batteries and its multi-electron reaction mechanism

2022 ◽  
Author(s):  
He Duan ◽  
Zhiyong Zhou ◽  
Yanming Zhao ◽  
Youzhong Dong
Keyword(s):  
Reaction Mechanism ◽  
Synergistic Effect ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Single Phase ◽  
Sol Gel ◽  
Lithium Ion ◽  
Gel Method ◽  
Sol Gel Method ◽  
Magnesium Molybdate

Single-phase magnesium molybdate, MgMoO4, is successfully synthesized by a facile sol-gel method. Attributed to the multielectron reaction and the synergistic effect of the elements molybdenum (Mo) and magnesium (Mg), the...

Enhanced room-temperature NO2 sensing properties of biomorphic hierarchical mixed phase WO3

Nanoscale ◽  
2020 ◽  
Vol 12 (47) ◽  
pp. 24285-24295
Author(s):  
He Lv ◽  
Zhuo Liu ◽  
Junkun Chen ◽  
Muhammad Ikram ◽  
Xue Bai ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Room Temperature ◽  
Mixed Phase ◽  
Gas Sensitivity ◽  
Sensing Properties ◽  
Sensitivity Performance

Synthesis of hierarchical mixed phase WO3 by effectively utilizing the structure of hemp. The morphology and synergistic effect of the mixed phase of WO3 effectively improved the NO2 gas sensitivity performance at RT.

Enhanced photoactivity and anatase thermal stability of silica–alumina mixed oxide additives on sol–gel nanocrystalline titania

2007 ◽  
Vol 61 (8-9) ◽  
pp. 1751-1755 ◽  
Author(s):  
K.V. Baiju ◽  
P. Periyat ◽  
P. Krishna Pillai ◽  
P. Mukundan ◽  
K.G.K. Warrier ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Nanocrystalline Titania ◽  
Silica Alumina ◽  
Thermal Stability Of

Enhancing the Efficiency of Dye Sensitized Solar Cells by Using Anatase and Brookite Mixed Phases of TiO2

2019 ◽  
Vol 14 (11) ◽  
pp. 1582-1588 ◽  
Author(s):  
M. I. Khan ◽  
Shahnawaz ◽  
Shahid Imran ◽  
Muhammad Waqas Yousaf ◽  
A. Wahab ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Anatase Phase ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Visible Region ◽  
Mixed Phase ◽  
Solar Simulator ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

The phases of TiO2 have an important role in the efficiency of dye sensitized solar cells (DSSCs). In this research, the effects of anatase and mixed phases (brookite and anatase) of TiO2 on the efficiency of DSSCs have been reported. 2% Cu doped TiO2 (Cu:TiO2) thin films are prepared by sol–gel dip coating technique. These films are annealed at the temperatures of "350 °C, 450 °C, 550 °C and 650 °C." XRD showed that at 550 °C and 650 °C, films have mixed phases of TiO2. Also, it showed that grain size is increased by increasing temperature. No extra phases of Cu like CuO etc. were observed in XRD graphs, which confirmed that Cu is completely dissolved into TiO2. UV-Vis results showed that all the films have more than 80% transmittance in the visible region. The optical band gap energy (Eg) of films at "350 °C, 450 °C, 550 °C and 650 °C" is 3.96, 3.81, 3.75 and 3.64 eV, respectively. The electrical resistivity of these thin films by four point probe technique is calculated as 121.8 × 102 Ω-m, 95.69 × 102 Ω-m, 86.65 × 102 Ω-m and 76.3 × 102Ω-m respectively. Solar simulator results showed that the current density (Jsc) of mixed phase is higher than single phase, causing higher efficiency. The maximum Jsc 5.12 mAcm–2 is achieved at 650 °C (mixed phase), resulting in higher efficiency of 2.35% which is more than 100 times the efficiency of anatase phase which has 1.18%. This work will provide a way to enhance the efficiency of DSSCs by using mixed phases of TiO2. In future, if 1-D structure of these mixed phases is used in DSSCs then efficiency of DSSCs will improve definitely (or positively).

A one-step nonaqueous sol–gel route to mixed-phase TiO2with enhanced photocatalytic degradation of Rhodamine B under visible light

CrystEngComm ◽  
2016 ◽  
Vol 18 (11) ◽  
pp. 1964-1975 ◽  
Author(s):  
Xu Liu ◽  
Yuxiu Li ◽  
Dongyang Deng ◽  
Nan Chen ◽  
Xinxin Xing ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Sol Gel ◽  
Mixed Phase ◽  
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