The Study of Activity of Rare-Earth Doped Four Potassium Titanate Whiskers Composite Photocatalyst

2013 ◽  
Vol 798-799 ◽  
pp. 170-173
Author(s):  
Mao Bin Wei ◽  
Dan Dan Wang ◽  
Zi Yang Lu ◽  
Peng Wei Huo ◽  
Yong Sheng Yan
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Rare Earth ◽  
Degradation Rate ◽  
Treatment Temperature ◽  
Rare Earth Doping ◽  
Composite Photocatalyst ◽  
Potassium Titanate ◽  
Photodegradation Rate ◽  
Rare Earth Doped

In this paper, the high temperature was adopted to treat the composited photocatalysts. The effects of different heat treatment temperature, rare-earth and concentration rare-earth on photocatalytic activity were investigated. The results showed that the photocatalytic activity was better when potassium titanate whiskers were calcinated at 600 0C without rare-earth doping. The effect of potassium titanate whiskers doped neodymium ion was the best, the degradation rate could increase to 59.0%. When neodymium nitrate was 0.04g, the degradation rate of composites photocatalysts was the best. The photodegradation rate could reach 74.02%. And the degradation rate of 10 mg/L tetracycline at 20 0C could increase to 86.31%.

Effects of Heat Treatment Temperature on Photocatalytic Activity of TiO2/SiO2 Composite Aerogels

2013 ◽  
Vol 27 (10) ◽  
pp. 1079-1083
Author(s):  
Zhao-Hui LIU ◽  
Gen-Liang HOU ◽  
Xun-Jia SU ◽  
Feng GUO ◽  
Zhou XIAO ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
Composite Aerogels

Photocatalytic Activity of TiO2-HZSM-5 Composite for C.I. Reactive Red 2 Degradation

2011 ◽  
Vol 213 ◽  
pp. 20-24
Author(s):  
Li Fang Zhang ◽  
Peng Wang ◽  
Wen Jie Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Calcination Temperature ◽  
Degradation Rate ◽  
Irradiation Time ◽  
Weight Ratio ◽  
Composite Photocatalyst ◽  
Temperature Range ◽  
Reactive Red 2

A composite of TiO2 and HZSM-5 zeolite was used for photocatalytic degradation of C.I. Reactive Red 2(RR2). With TiO2 concentration of 320 mg/l, the optimum composite was composed of TiO2 and HZSM-5 by the weight ratio of 1:10. The composite showed higher activity than the P25 powder in calcination temperature range from 400 to 600 oC and 450 oC can be the optimum calcination temperature. When irradiation time was 40 min, the composite degraded 96.8% of the initial RR2. 94.9% of the dye was degraded in 70 min using pure TiO2. The RR2 degradation rate increased constantly with increasing composite photocatalyst concentration up to 320 mg/l. The activity of the composite grinded without ethanol was less than that of the composite photocatalyst grinded with ethanol.

Rare-Earth-Doped Pt/Ba/Ce0.6Zr0.4O2-Al2O3for NOxStorage and Reduction: The Effect of Rare-Earth Doping on Efficiency and Stability

ChemCatChem ◽  
2013 ◽  
Vol 6 (1) ◽  
pp. 237-244 ◽  
Author(s):  
Xiuyun Wang ◽  
Zhilin Chen ◽  
Yuling Wang ◽  
Ruihu Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Doping ◽  
Rare Earth Doped

Improved Photocatalytic Activity of Copper Heterostructure Composites (Cu–Cu2O–CuO/AC) Prepared by Simple Carbothermal Reduction

2014 ◽  
Vol 67 (5) ◽  
pp. 749 ◽  
Author(s):  
Hongchao Ma ◽  
Yifeng Liu ◽  
Yinghuan Fu ◽  
Chunling Yu ◽  
Xiaoli Dong ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Activated Carbon ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Carbothermal Reduction ◽  
Treatment Time ◽  
Carbon Support ◽  
Treatment Temperature ◽  
X Ray

Cu–Cu2O–CuO/activated carbon heterostructure composites with visible-light activity have been successfully synthesized by a simple carbothermal reduction procedure using CuSO4 as a single precursor. The resultant samples were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy measurements. The results showed that the Cu–Cu2O–CuO composites with size less than 10 nm dispersed well on the surface of activated carbon. Activated carbon played both a reducing agent and support role in the formation of Cu–Cu2O–CuO/activated carbon heterostructure composites. X-ray photoelectron spectroscopy analysis suggests that the outside of the nanoparticles is CuO and the inside of the nanoparticles is Cu metal and Cu2O. Moreover, the composition of Cu–Cu2O–CuO/activated carbon composites can be tailored by varying the Cu loading, heat-treatment temperature, and heat-treatment time. The photocatalytic activities of the catalysts were investigated by degrading reactive brilliant blue KN-R under visible-light irradiation. The Cu–Cu2O–CuO/activated carbon heterostructure composites showed excellent photocatalytic activity compared with other catalysts (pure CuO, Cu2O, Cu2O/activated carbon, CuO/activated carbon, and Cu2O–CuO/activated carbon), which is ascribed to synergistic action between the activated carbon support and photoactive copper species, and the presence of interfacial structures such as a Cu2O/CuO heterostructure, Cu/Cu2O (or CuO) Schottky barrier, and Cu2O/Cu/CuO ohmic heterojunction.

The effect of surface OH-population on the photocatalytic activity of rare earth-doped P25-TiO2 in methylene blue degradation

2008 ◽  
Vol 260 (1) ◽  
pp. 75-80 ◽  
Author(s):  
P. Du ◽  
A. Bueno-López ◽  
M. Verbaas ◽  
A.R. Almeida ◽  
M. Makkee ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Rare Earth ◽  
Methylene Blue Degradation ◽  
Rare Earth Doped ◽  
Effect Of Surface

Photocatalytic Activity of Anatase Fiber-Mats

2012 ◽  
Vol 1442 ◽  
Author(s):  
Annelise K. Alves ◽  
Felipe A. Berutti ◽  
Carlos P. Bergmann
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Surface Area ◽  
Heat Treatment Temperature ◽  
Morphological Characterization ◽  
High Reactivity ◽  
Electrospinning Process ◽  
Treatment Temperature ◽  
Alcoholic Solution ◽  
Fiber Mats

ABSTRACTNanostructured fiber-mats have large surface area, high reactivity, low weight and low agglomeration tendency. These are advantages if compared with nanoparticles for photocatalytic application. Fiber-mats can be used not only as a photocatalytic material on their own, but also incorporated in different surfaces or fabrics and as well as a filtration membrane. In this work, high temperature stable anatase titanium dioxide fiber-mats doped with silica (0.5 to 30 %) or doped with tin (0.5 to 15 %) were produced by electrospinning technology. The precursors used were titanium propoxide (TiP), tetrapropoxysilane (TPS) and tin 2-ethylhexanoate. They were hydrolyzed in acetic acid and mixed with an alcoholic solution of 10 wt% polyvinylpirrolidone. The effect of heat treatment on the microstructure characteristics and the photocatalytic activity of the fiber-mats in comparison with a commercial TiO2 powder (Evonik P-25) were studied. After the electrospinning process, a thin, porous fiber-mat was obtained. This material was dried in air at room temperature for 24h. These fibers were then heat treated from 500 to 800°C for 3 hours at a heating rate of 1.4°C/min. The fiber-mats were then characterized using N2 adsorption (BET method) for surface area measurements, X-ray diffraction for phase determination, SEM and TEM analyses for morphological characterization. The photocatalytic activity was studied using as model system the degradation of methyl orange in water (20ppm) under UV-A light. As-obtained fibers are amorphous but become crystalline after heat treatment. As the heat treatment temperature increases the surface area decreases significantly. Quite the opposite happens with the rutile to anatase ratio and the anatase and rutile crystallite sizes, which increase with higher heat treatment temperatures. The photoactivity increases with the increment in heat treatment temperature until 650°C, when the fibers start to become denser and the surface area drops due to sintering. Fibers produced at higher temperatures and with lower amounts of Si and Sn are predominantly anatase and are generally more photoactive under UV-A radiation.

Fabrication and Characterization of Photocatalyst Coatings by Heat Treatment in Carbon Powder for TiC Coatings

2017 ◽  
Vol 263 ◽  
pp. 137-141
Author(s):  
Su Jun Guan ◽  
Liang Hao ◽  
Hiroyuki Yoshida ◽  
Hiroshi Asanuma ◽  
Fu Sheng Pan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Oxygen Vacancies ◽  
Treatment Temperature ◽  
Carbon Powder ◽  
Treatment Conditions ◽  
Fabrication And Characterization ◽  
Mechanical Coating

Photocatalyst coatings on alumina (Al2O3) balls had been successfully fabricated by mechanical coating technique, with titanium carbide (TiC) powder and subsequent heat treatment in carbon powder. The effect of heat treatment conditions in carbon powder on the formed compounds, surface morphology and photocatalytic activity of photocatalyst coatings was investigated. XRD results show that the formed compounds change with increasing the heat treatment temperature in carbon powder, and rutile TiO2 on the surface of TiC coatings at 1073 K and 1173 K. The generated oxygen vacancies confirmed by XPS measurement, are in favor of narrowing band gap to enhance the visible-light photocatalytic activity of photocatalyst coatings. The photocatalytic activity of photocatalyst coatings has been effectively enhanced, and the samples fabricated at 1073 K and 1173 K for 2 h show higher activity. The fabrication strategy provides us a facile preparation procedure of visible-light responsive photocatalyst coatings.

Sign in / Sign up

Export Citation Format

Share Document