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.

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.

Photocatalytic Activity of TiO2 Loaded on HZSM-5 Zeolite Modified by Ammonia Phosphate

2011 ◽  
Vol 214 ◽  
pp. 6-10
Author(s):  
Wen Jie Zhang ◽  
Ke Xin Li ◽  
Yang Yu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Adsorption Equilibrium ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Gel Method ◽  
Sol Gel Method ◽  
Orange Solution ◽  
Decoloration Rate

The ammonia phosphate treated HZSM-5 zeolite was used as support for TiO2 prepared by sol-gel method. Adsorption and photocatalytic activity of the zeolite, adsorption of the loaded TiO2, and the optimum TiO2 loading percentage were studied. The zeolite can concentrate methyl orange solution after adsorbing water and possesses no obvious photocatalytic activity. The solution reached its adsorption equilibrium after 20 min when using TiO2 loaded on HZSM-5. In the TiO2 loading range from 10% to 70%, the dye decoloration rate increased constantly from 20% to 36.2%. The activity of the TiO2 was enhanced after loading with the optimum loading percent of 70%. During the whole 180 min of irradiation, TiO2/HZSM-5 showed enhanced methyl orange decoloration activity.

Photocatalytic Properties of Silver Oxide Loaded on Bismuth Vanadate

2013 ◽  
Vol 320 ◽  
pp. 654-660 ◽  
Author(s):  
Lian Wei Shan ◽  
Wei Li ◽  
Zhong Li ◽  
Jin Bo Mi ◽  
Da Sun ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Raw Materials ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Photocatalytic Efficiency ◽  
Sintering Process ◽  
Calcination Time ◽  
Transmission Electron ◽  
Orange Solution

In order to enhance the photocatalytic activity of BiVO4, the Ag2O loaded on BiVO4is studied. In this study, Ag2O loaded on BiVO4was prepared with Bi(NO3)3, NH4VO3and C6H8O7as raw materials by sol-gel method. Influences of the sintering temperature and sintering time were studied on photocatalytic activity, crystal composition and molecular structure. The molecules of matter were characterized by FTIR. Both the phase transition in the sintering process and the influence of Ag2O loaded on crystal structure and size of the BiVO4powder were studied by XRD. The structure of the obtained samples were studied using transmission electron microscopy. The photocatalytic activity Ag2O loaded on BiVO4in different calcination time and different calcination temperature had been studied through the degradation methyl orange solution. It is found that the BiVO4photocatalytic efficiency of methyl orange is about 20% when the samples calcined for 4h and calcined at 500°C, the Ag2O loaded on BiVO4photocatalytic efficiency of methyl orange is doubled.

Microwave Synthesis and Photocatalytic Activity of Ce4+, Fe3+ Co-Doped TiO2 Nanocomposite

2013 ◽  
Vol 815 ◽  
pp. 523-528
Author(s):  
Wan Qing Xiong ◽  
Quan Xin Zhu ◽  
Jian Lei ◽  
Wen Xiang Ye ◽  
Xue Hong Liao
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Ph Value ◽  
Methyl Orange Solution ◽  
Good Prospect ◽  
Titanium Sulfate ◽  
Doped Titanium Dioxide ◽  
Orange Solution ◽  
Co Doped

In this paper, Ce4+ and Fe3+co-doped titanium dioxide nanocomposite was prepared by iron nitrate, cerium sulfate and titanium sulfate as raw materials and sodium dodecyl sulfate as surfactant under microwave irradiation. The x-ray diffraction (XRD) results show that as-prepared sample of direct adding doped cerium and iron content were 0.2% and 0.5% of titanium sulfate amount of substance calcined at 500°C for 2 h is anatase. We also studied the photocatalytic activity of the as-prepared Fe3+ and Ce4+ co-doped TiO2 nanocomposite by using degradation of methyl orange solution. The effect conditions of photo-catalytic activities of the composite were investigated, such as different ratios of direct adding doped iron and cerium content, different dosage of hydrogen peroxide, different pH value, and different dosage of nanocomposite. When the catalyst is 1.0 g/L, pH value is 4.3, C(H2O2) is 3 mL/L, the effect of the visible light catalytic activity was the best, in 20 min, the degradation rate of 20 mg/L methyl orange solution was more than 90%. Obviously, as-prepared Fe3+ and Ce4+ co-doped titanium dioxide nanocomposite as photocatalysts for degradation methyl orange, has a significant effect. Moreover, the operation was simple, and there was no secondary pollution. In a word, it has a good prospect.

Properties of a three-dimensionally ordered macro-mesoporous carbon-doped TiO2 composite catalyst

2014 ◽  
Vol 07 (01) ◽  
pp. 1350068 ◽  
Author(s):  
Wubin Sui ◽  
Jingtang Zheng ◽  
Charles U. Pittman ◽  
Nasr Bensalah ◽  
Mingbo Wu ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Mesoporous Carbon ◽  
Methyl Orange Solution ◽  
Carbon Doping ◽  
Composite Catalyst ◽  
Carbon Doped ◽  
Structure Morphology

This study aimed to develop an effective, environmentally benign composite catalyst composed of carbon materials and titanium dioxide ( TiO 2). Carbon-doped titanium dioxide ( C – TiO 2) was prepared by coating TiO 2 onto macro-mesoporous carbon (MMC). The structure, morphology and surface chemistry states of the C – TiO 2 were characterized by XRD, TEM, XPS, UV-vis and FTIR. The photocatalytic activity of C – TiO 2 was evaluated based on the decomposition of an aqueous methyl orange solution in visible light. C – TiO 2 significantly improved photocatalytic activity. A possible mechanism for the improvement of the photocatalytic activity of C – TiO 2 in visible light was proposed. The results of the analysis suggested that MMC played key roles as the support, absorbent, location of photo-generated electron transfer, and carbon-doping source during methyl orange photodegradation.

Preparation of Titanium Dioxide Nanotube Arrays and Photocatalytic Degradation of Methyl Orange

2014 ◽  
Vol 886 ◽  
pp. 262-265
Author(s):  
Ying Cao Xu ◽  
Hong You
Keyword(s):  
Titanium Dioxide ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Uv Light ◽  
Pure Titanium ◽  
Methyl Orange Solution ◽  
Nanotube Arrays ◽  
Nanotube Array ◽  
Orange Solution ◽  
Degradation Of Methyl Orange

This paper adopted electrochemistry anodic oxidation method for preparing TiO2nanotube array membrane on a pure titanium sheet. The results showed that TiO2nanotube arrays were regularly obtained when anodizing voltage at 25V, anodizing time in 60min , NH4F concentration at 0.25mol·L-1, and volume ratio of glycerol and water at 2:1. Using of this titanium dioxide nanotube array photocatalyst, and Under light of ultraviolet lamp, the photocatalytic degradation of methyl orange solution was studied in this paper. The main factors affecting the test selection was: the concentration of methyl orange solution (5mg·L-1, 10mg·L-1, 15mg·L-1, 25mg·L-1, 35mg·L-1), pH of methyl orange solution (2.0,2.5,3.0,3.5, 4.0,5.0,5.5,6.0), catalytic time (30min.60min, 90min, 120min, 150min, 180min, 240min), UV light source (6w, 11w, 15w).

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.

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.

scholarly journals An Ultrasound Application for TiO2 Photocatalytic Degradation of Methyl Orange

2021 ◽  
Author(s):  
Xianzhen Diao ◽  
Jin XU ◽  
Yufei WANG
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
X Ray Diffraction ◽  
Doping Amount ◽  
Nickel Doping ◽  
Ultrasound Application ◽  
Ultrasound Technology

Nanometer TiO2 photocatalysts were prepared by the sol–gel method. The catalysts were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, ultraviolet-visible spectroscopy, and other techniques. Methyl orange solution was used for the degradation of the organic material and ultrasonic technology was used to determine the photocatalytic performance of the catalysts. The results show that the photocatalytic performance of the Ni-N-TiO2 is clearly improved under ultrasonic conditions. The TiO2 photocatalytic degradation effect is optimal at a catalyst concentration of 0.3 g/L, an initial concentration of the organic matter of 0.03 mmol/L, a nickel-doping amount of 2 mol %, and a nitrogen-doping amount of 15 mol %. The use of ultrasound technology in combination with photocatalysis has a positive effect and results in a TiO2 degradation rate of methyl orange of 95 % after 3 h.

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