Preparation and Optical Properties of Lanthanum Doped Ultra-Fine TiO2 Photocatalyst

2013 ◽  
Vol 591 ◽  
pp. 267-271
Author(s):  
Jing Xu ◽  
Zhi Liang Jin
Keyword(s):  
Visible Light ◽  
Synergistic Effects ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Raw Material ◽  
Tetrabutyl Titanate ◽  
Solution Rate ◽  
Lanthanum Doping ◽  
Degradation Time ◽  
Orange Solution

In the experiment, the tetrabutyl titanate and lanthanum nitrate were used as raw material, lanthanum doped TiO2 powder was prepared by sol-gel method, were characterized by using XRD, UV-vis, IR to determine the crystal structure, grain size and spectral properties. The results showed that the calcination temperature is 600 °C, lanthanum doping ratio is 0.6%, the amount of catalyst is 50mg and the visible light photocatalytic degradation time at 60min, the degradation of methyl orange solution rate of 20mg/L can reach 36%. Samples with anatase as the main, in the catalyst preparation process, due to the synergistic effects of lanthanum doping, the modified TiO2 absorption band of different redshift, enhanced the catalytic activity of TiO2 visible light.

Synthesis and Performance Characterization of Highly Active Samarium Doped TiO2 Nanopowder

2014 ◽  
Vol 633 ◽  
pp. 21-25
Author(s):  
Jing Xu
Keyword(s):  
Visible Light ◽  
Calcination Temperature ◽  
Raw Materials ◽  
Synergistic Effects ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Raw Material ◽  
Tetrabutyl Titanate ◽  
Solution Rate ◽  
Preparation Process

In the experiment, the tetrabutyl titanate and samarium trinitrate were used as raw material, samarium doped TiO2 powder was prepared by sol-gel method. Main factors that affect the TiO2 nanoparticles, such as catalyst, ratio of raw materials, and calcination temperature of the preparation process were studied. TiO2 powder was characterized by using XRD, UV-vis, IR to determine the crystal structure, grain size and spectral properties. The results show that, the amount of catalyst is 50mg, the calcination temperature is 500 °C, samarium doping ratio is 0.4%, and the visible light photocatalytic degradation time at 60min, the degradation of methyl orange solution rate of 20mg/L can reach 42.8%. Samples with anatase as the main, in the catalyst preparation process, due to the synergistic effects of samarium doping, the modified TiO2 absorption band of different redshift, enhanced the catalytic activity of TiO2 visible light.

REE Lanthanum Doping Influence on the Photocatalysis Properties of Titanium Dioxide

2012 ◽  
Vol 550-553 ◽  
pp. 388-391
Author(s):  
Xing Jin ◽  
Jin Lan Lian ◽  
Yu Qiao
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Lanthanum Doping ◽  
Light Area ◽  
Orange Solution

Lanthanum doping TiO2 were prepared by sol-gel method, an the photocatalytic degradation experiments were performed by using methyl orange solution as a target degradant. The results indicated that Suitable doping quantity of lanthanum can improve the photocatalytic activity of nanometer TiO2 powders. On the basis of 50 mL methyl orange solution what concentration is 20 mg/L, photocatalytic activity is the best when doping quantity of lanthanum were 1.0 wt %. Through the relatively experiments by using sunshine and ultraviolet as light source, the results indicated that the La3+ doping broaden the scope of visible light area what TiO2 response to.

scholarly journals Modified Sol-Gel Synthesis of Carbon Nanotubes Supported Titania Composites with Enhanced Visible Light Induced Photocatalytic Activity

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Quanjie Wang ◽  
Yanqing Wang ◽  
Baorong Duan ◽  
Mengmeng Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Photocatalytic Activity ◽  
Carbon Nanotube ◽  
Visible Light ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Raw Material ◽  
Tetrabutyl Titanate ◽  
Multiwalled Carbon ◽  
Photodegradation Efficiency

Multiwalled carbon nanotube (MWCNT) enhanced MWCNT/TiO2nanocomposites were synthesized by surface coating of carbon nanotube with mixed phase of anatase and rutile TiO2through a modified sol-gel approach using tetrabutyl titanate as raw material. The morphological structures and physicochemical properties of the nanocomposites were characterized by FT-IR, XRD, DTA-TG, TEM, and UV-Vis spectra. The results show that TiO2nanoparticles with size of around 15 nm are closely attached on the sidewall of MWCNT. The nanocomposites possess good absorption properties not only in the ultraviolet but also in the visible light region. Under irradiation of ultraviolet lamp, the prepared composites have the highest photodegradation efficiency of 83% within 4 hours towards the degradation of Methyl Orange (MO) aqueous solution. The results indicate that the carbon nanotubes supported TiO2nanocomposites exhibit high photocatalytic activity and stability, showing great potentials in the treatment of wastewater.

Fabrication of Pr-Doped Bi2O3 with Enhanced Photocatalytic Performance under Visible Light

2012 ◽  
Vol 550-553 ◽  
pp. 196-199
Author(s):  
Ze Wan ◽  
Fa Mei Feng ◽  
Jian Zhang Li ◽  
Jin Jin He ◽  
Jun Bo Zhong ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Reflectance Spectroscopy ◽  
Surface Photovoltage Spectroscopy ◽  
Orange Solution

This paper reveals that photocatalytic activity of Bi2O3 under visible light towards the decolorization of Methyl Orange solution can be greatly enhanced by doping Pr into the lattice of Bi2O3 using a sol-gel method. The photocatalysts were characterized by BET, UV-Vis diffuse reflectance spectroscopy and surface photovoltage spectroscopy (SPS), respectively. The result shows that 4%Pr doped Bi2O3 possesses the best photocatalytic activity under visible light.

Synthesis and Photocatalytic Properties of Bi2Ti2O7 Nano-Powders

2011 ◽  
Vol 412 ◽  
pp. 103-106 ◽  
Author(s):  
Xiao Li Su ◽  
Ying Chun Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Sol Gel ◽  
Spherical Shape ◽  
Methyl Orange Solution ◽  
Tetrabutyl Titanate ◽  
Average Grain Size ◽  
Structure And Microstructure ◽  
Orange Solution ◽  
Xrd And Tem

Bi2Ti2O7 nanopowders were prepared using bismuth nitrate and tetrabutyl titanate as starting materials by sol-gel method. The decomposition of precursors, crystal structure and microstructure of the sample was characterized by TG/DTA, XRD and TEM techniques, and the results indicate that the sample is well-crystallized pyrochlore Bi2Ti2O7 phase with spherical shape and an average grain size of 30 nm. Photocatalytic activity of Bi2Ti2O7 powders was evaluated by photodegrading methyl orange solution. The result shows that Bi2Ti2O7 has a higher photocatalytic activity than TiO2 (mixed with rutile and anatase) with the same concentration, and when concentration of Bi2Ti2O7 increased to 9g/L, half-life period T1/2 is 0.97h, then methyl orange solution can be completely degraded in more than an hour.

Preparation and Photocatalytic Property of TiO2/NiFe2O4 Composite Photocatalysts

2012 ◽  
Vol 518-523 ◽  
pp. 775-779 ◽  
Author(s):  
Dong Dong Tan ◽  
De Fu Bi ◽  
Peng Hui Shi ◽  
Shi Hong Xu
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Photocatalytic Property ◽  
Methyl Orange Solution ◽  
X Ray Diffraction ◽  
Doping Amount ◽  
X Ray ◽  
Uv Illumination ◽  
Composite Photocatalysts ◽  
Orange Solution

The TiO2/NiFe2O4 (TN) composite nanoparticles with different mass ratios of NiFe2O4 to TiO2 were prepared via sol-gel method. X-ray diffraction was used to characterize the phase structure of TN. The results indicated that adulterating a smidgen of NiFe2O4 into the TiO2 (about 0.1%) can promote the phase transformation of TiO2, however, when the doping amount of NiFe2O4 surpasses 1%, the introduction of NiFe2O4 can inhibit the growth of TiO2 crystal grain and reduce the size of TiO2 crystal grain. The degradation experiment of methyl orange solution under UV illumination (253.7 nm) showed that the content of NiFe2O4 in the TN was higher, the photocatalytic activity of TN was worse, and the 0.1% TiO2/NiFe2O4 calcined at 400 °C presented the best photocatalytic activity.

Preparation and Characterization of Expanded Graphite with TiO2 Composites

2011 ◽  
Vol 197-198 ◽  
pp. 807-810
Author(s):  
Li Qin Wang ◽  
Xiang Ni Yang ◽  
Xiu Li Zhao ◽  
Rui Jun Zhang ◽  
Yu Lin Yang
Keyword(s):  
Methyl Orange ◽  
Expanded Graphite ◽  
Methyl Orange Solution ◽  
Tetrabutyl Titanate ◽  
Excellent Performance ◽  
Decolorization Rate ◽  
Preparation Conditions ◽  
The Rich ◽  
Orange Solution

The composites of expanded ghaphite with TiO2(EG/TiO2) have been prepared in the method of precursor mixing, and the optimum preparation conditions have been studied. The morphology and crystal structure of the EG/TiO2composites have been characterized by the means of SEM and XRD. Also their performance of decolorization for methyl orange solution has been researched. The results are shown as follows: the EG/TiO2composites maintain the rich porous and network structure of EG, and a lot of anatase TiO2particles widely distribute on surfaces and in layers of EG. Compared with TiO2sol, taking tetrabutyl titanate as titanium source, the prepared EG/TiO2composites have better performance. Increasing the added amount of tetrabutyl titanate, the decolorization rate of methyl orange solution increases at first, and then decreases. When adding 2 mL tetralbutyl titanate, the decolorization rate is at the peak, up to 98.4%. These results show the composites have excellent performance of decolorization for methyl orange solution. We suppose it is mainly due to the interaction between the adsorption of EG and the degradation of TiO2particles.

Cooperative Catalytic Effect Analysis of Visible Light Response Nano-ZnO and TiO2

2011 ◽  
Vol 71-78 ◽  
pp. 2848-2851
Author(s):  
Gang Li ◽  
Yan Sheng Li ◽  
Ying Wang ◽  
Hong Gao
Keyword(s):  
Light Response ◽  
Methyl Orange Solution ◽  
Nano Zno ◽  
Effect Analysis ◽  
Visible Light Response ◽  
Mixed Catalyst ◽  
Degradation Rates ◽  
Degradation Effect ◽  
Degradation Time ◽  
Orange Solution

Nano-ZnO, nano-TiO2and their mixed catalyst respectively degrade methyl orange solution with concentration 10mg/L in sunlight. When the dosing quantity is 1g/L during 8h degradation, the degradation effect is better and the degradation rates of three catalysts can all reach more than 93% with prolonging of degradation time, and the degradation effect of mixed catalyst is best and its degradation rate reaches more than 99%. Moreover the effect of TiO2content in the mixed catalyst on catalytic degradation isn’t distinct.

The Application of Modified Nanometer Titanium Dioxide in Degradation of Methyl Orange Solution

2013 ◽  
Vol 750-752 ◽  
pp. 1401-1404
Author(s):  
Xin Qian Shu ◽  
Zhi Qiang Shan
Keyword(s):  
Methyl Orange ◽  
Doping Concentration ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Optimum Concentration ◽  
Thin Membrane ◽  
Glazed Ceramic ◽  
Gel Processing ◽  
Orange Solution ◽  
Degradation Of Methyl Orange

The nanometer TiO2 thin membrane on different substrates doped with La3+ was prepared from Ti (OC4H9)4 and La (NO3)3 by Sol-Gel processing using dipping technique. The photocatalytic activity of membrane at different doping concentration in photocatalytic methyl orange was studied. The result showed that both the degraded rate and the optimum concentration depended on the change of doping concentration and substrates. When TiO2 thin membrane was doped with 0.5 La3+ on the substrates of glazed ceramic, aluminum and stainless steel, TiO2 membrane has the maximum degradation rate.

Photocatalytic Reduction of Methyl Orange Using Titania Photocatalyst Codoped with Nitrogen and Gadolinium under Visible Light Illumination

2009 ◽  
Vol 79-82 ◽  
pp. 2127-2130 ◽  
Author(s):  
Song Tao Gu ◽  
Xin Wang ◽  
Qiang Liu ◽  
Hao Quan Liu ◽  
Gui Jun Jiang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Synergistic Effects ◽  
Sol Gel ◽  
Visible Region ◽  
Light Illumination ◽  
Active Nitrogen ◽  
Doped Tio2 ◽  
Codoped Tio2

A visible-light-active nitrogen and gadolinium codoped TiO2 catalyst was synthesized by the sol-gel route. For comparison, Gd-doped sample, N-doped sample, and pure titania were prepared through the same method, without adding the corresponding dopants. The as-prepared photocatalysts were characterized by X-ray diffraction (XRD) and Uv-vis spectra. The results showed that the codoped photocatalyst exhibited a smaller size than the undoped titania. The transformation from anatase to rutile was suppressed by doping with N and Gd atoms. Furthermore, the absorbance spectra of N, Gd-codoped TiO2 exhibited a significant red shift to the visible region. The photocatalytic activity of N, Gd-codoped TiO2 was evaluated by photodegradation of methyl orange under visible light irradiation. This codoped sample exhibited enhanced photocatalytic activity compared to N-doped TiO2, Gd-doped TiO2, and pure TiO2. The improvement of the photocatalytic activity was ascribed to the synergistic effects of the N and Gd co-doping.

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