The Influence of Yb3+/Er3+ Co-Doped β-NaYF4 Up-Conversion Micron Tubes on Photocatalytic Activity of TiO2 for Degradation of Organic Dyes

2015 ◽  
Vol 1118 ◽  
pp. 211-216
Author(s):  
Yuan Liang Ma ◽  
Xue Rong Zheng ◽  
Wei Liu ◽  
Hai Qin Li ◽  
Hui Ming Ji
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Degradation Rate ◽  
Organic Dyes ◽  
Photocatalytic Efficiency ◽  
Simulated Sunlight ◽  
Combination Methods ◽  
Photocatalytic Activities ◽  
Pure Phase ◽  
Co Doped

Pure phase of Yb3+/Er3+ co-doped β-NaYF4 micron tubes with up-conversion fluorescence were synthesized by hydrothermal method at 180°C for 24 hours. For better utilization of sunlight and improving photocatalytic efficiency of organic dyes, TiO2 nanoparticles were modified by combining with β-NaYF4 micron tubes to form TiO2/NaYF4 composite. Three different combination methods were studied and the photocatalytic activities of the corresponding samples were tested by measuring the degradation rate of rhodamine aqueous solution under illumination of simulated sunlight. The composite that TiO2 nanoparticles were well dispersed on the surface of NaYF4 shows better photocatalytic activity than other composites and was near twice efficiency of pure TiO2 nanoparticles. The reason may be due to the high activity of heterostructure for TiO2/NaYF4 composite that will make it easy for sunlight absorption and photocatalytic degradation.

Photocatalytic Activity of Gd3+ and Sm3+ Co-Doped BiVO4 Powders Prepared by Chemical Precipitation Process

2012 ◽  
Vol 508 ◽  
pp. 259-262 ◽  
Author(s):  
Cheng Zhi Jiang ◽  
Rui Yang ◽  
Sen Bai ◽  
Xu Dong Lu
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Chemical Precipitation ◽  
Chemical Precipitation Method ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Co Doped

Pure BiVO4, single doped and co-doped BiVO4 have been prepared by chemical precipitation method and characterized by the techniques such as XRD and SEM/EDAX. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate pure BiVO4, single doped BiVO4 and co-doped BiVO4 photocatalytic activity. The results show that doping of single doped and co-doped significantly enhance the photocatalytic activity of BiVO4. When the 0.1%Gd3+ and 0.2%Sm co-doped, the BiVO4 degradation rate reaches 91%.

Influence of Sm3+ and Gd3+ Co-Doping on Photocatalytic Activity of TiO2

2011 ◽  
Vol 239-242 ◽  
pp. 1045-1048
Author(s):  
Xu Dong Lu ◽  
Cheng Zhi Jiang
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Phase Transformation ◽  
Photocatalytic Activity ◽  
Degradation Rate ◽  
Sol Gel ◽  
Nano Particles ◽  
Co Doping ◽  
The Matrix ◽  
Co Doped

Pure TiO2, Sm3+and Gd3+co-doping TiO2have been prepared by sol-gel method and characterized by the techniques such as XRD and SEM. The photocatalytic degradation of methylene blue (MB) in aqueous solution was used as a probe reaction to evaluate Pure TiO2, Sm3+and Gd3+co-doping TiO2photocatalytic activity. The matrix distortion of TiO2increases after co-doping of Sm3+and Gd3+are clearly observed. The results show that co-doping of Sm3+and Gd3+inhibits the phase transformation of TiO2from anatase to rutile, decreases the diameter of TiO2nano-particles and significantly enhance the photocatalytic activity of TiO2. When the co-doped amounts for Sm3+and Gd3+are 0.1% and 0.2%, its degradation rate reaches 99%.

scholarly journals Photocatalytic Degradation of Tetracycline in Aqueous Solution Using Copper Sulfide Nanoparticles

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1238
Author(s):  
Murendeni P. Ravele ◽  
Opeyemi A. Oyewo ◽  
Sam Ramaila ◽  
Lydia Mavuru ◽  
Damian C. Onwudiwe
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Copper Sulfide ◽  
Degradation Rate ◽  
Light Exposure ◽  
Reaction System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Pure Phase

In this paper, spherical-shaped pure phase djurleite (Cu31S16) and roxbyite (Cu7S4) nanoparticles were prepared by a solvothermal decomposition of copper(II) dithiocarbamate complex in dodecanthiol (DDT). The reaction temperature was used to control the phases of the samples, which were represented as Cu31S16 (120 °C), Cu31S16 (150 °C), Cu7S4 (220 °C), and Cu7S4 (250 °C) and were characterized by using X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), and absorption spectroscopy. The samples were used as photocatalysts for the degradation of tetracycline (TC) under visible light irradiation. The results of the study showed that Cu7S4 (250 °C) exhibited the best activity in the reaction system with the TC degradation rate of up to 99% within 120 min of light exposure, while the Cu31S16 (120 °C) system was only 46.5% at the same reaction condition. In general, roxbyite Cu7S4 (250 °C) could be considered as a potential catalyst for the degradation of TC in solution.

0D/3D-CdSe/Bi12TiO20 Pyramidal Heterostructure Photocatalysts for Enhanced Visible-Light Photocatalytic Activities

NANO ◽  
2017 ◽  
Vol 12 (06) ◽  
pp. 1750072 ◽  
Author(s):  
Tao Wang ◽  
Changchang Ma ◽  
Dan Wu ◽  
Xinlin Liu ◽  
Yang Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
High Stability ◽  
Photocatalytic Efficiency ◽  
Cdse Qds ◽  
Electron Hole ◽  
Adsorption Sites ◽  
Photocatalytic Activities ◽  
Visible Light Photocatalytic

In this paper, a novel heterostructure of 0D/3D-CdSe/Bi[Formula: see text]TiO[Formula: see text] pyramidal photocatalyst was synthesized and characterized. It exhibited significantly photocatalytic efficiency in photocatalytic degradation of the tetracycline than pure Bi[Formula: see text]TiO2 and CdSe and showed high stability. The enhanced photocatalytic activity might be attributed to the formation of heterostructure between CdSe QDs and 3D Bi[Formula: see text]TiO[Formula: see text], in which CdSe QDs served as electron trapper to improve the separation of photodegradation electron–hole pairs, and provided a number of active adsorption sites for the photogenerated of pollutants. The photocatalytic mechanism of 0D/3D-CdSe/Bi[Formula: see text]TiO[Formula: see text] pyramidal heterostructure was also proposed.

scholarly journals Geopolymer-TiO2 Nanocomposites for Photocsatalysis: Synthesis by One-Step Adding Treatment Versus Two-Step Acidification Calcination

Minerals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 658 ◽  
Author(s):  
Xiaohui Yang ◽  
Yi Liu ◽  
Chunjie Yan ◽  
Ronghua Peng ◽  
Hongquan Wang
Keyword(s):  
Photocatalytic Activity ◽  
Treatment Process ◽  
Photocatalytic Efficiency ◽  
Step Method ◽  
Calcination Process ◽  
Tio2 Particles ◽  
Study Results ◽  
Photocatalytic Activities ◽  
One Step ◽  
The One

Geopolymer-TiO2 nanocomposites were prepared by two different techniques, namely the two-step acidification calcination treatment and one-step adding method. The potential photocatalytic activities of geopolymer-TiO2 nanocomposites prepared by the two different methods were tested and compared. Nanocomposites prepared via the one-step process showed better photocatalytic activity. The amount of TiO2 particles loaded on the surface of the foaming materials was investigated by XRD and SEM-Mapping. By comparing with the sample obtained from two-step treatment, the TiO2 particles were distributed uniformly on the surface of the foaming materials for the sample obtained from the one-step method in this study. Results showed that the specific surface area of the geopolymer-TiO2 prepared by the one-step treatment process (28.67 m2/g) was significantly lower than the two-step acidification calcination process (215.04 m2/g), while the photocatalytic efficiency with methylene blue trihydrate (MB) was better. This is due to the more stable structure of geopolymer-TiO2 nanocomposites, the better dispersion and more loading of TiO2 particles on the foaming materials surfaces, leading to the enhanced photocatalytic activity.

scholarly journals Preparation of Fe3+ Doped High-Ordered TiO2 Nanotubes Arrays with Visible Photocatalytic Activities

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2107
Author(s):  
Jin Zhang ◽  
Chen Yang ◽  
Shijie Li ◽  
Yingxue Xi ◽  
Changlong Cai ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Tio2 Nanotubes ◽  
Degradation Rate ◽  
Rutile Phase ◽  
Visible Light Range ◽  
Crystallization Method ◽  
Photocatalytic Activities ◽  
Tio2 Ntas ◽  
Temperature Water

In this paper, the Fe3+ doped rutile phase TiO2 nanotubes arrays (NTAs) were prepared in a low temperature water-assistant crystallization method. It is noteworthy that the Fe3+ doping hardly hinders either the crystallization of rutile TiO2 NTAs or the highly-ordered nanotubular morphologies. Moreover, Fe3+ did not form other compound impurities, which indicated that Fe3+ substitute Ti4+ into the lattice of TiO2. With the introduction of Fe3+, the light absorption range of TiO2 NTAs extends from the ultraviolet band to the visible light range. Photocatalytic testing results indicate that Fe3+ doped TiO2 NTAs can effectively improve the degradation rate of methyl orange aqueous solution in visible light, and the TiO2 NTAs with 0.2 mol/L Fe3+ doping exhibits the highest photocatalytic degradation efficiency.

Synthesis and Recycle of ZnO Particles for Degradation of Methyl Orange Aqueous Solution

2011 ◽  
Vol 121-126 ◽  
pp. 587-591 ◽  
Author(s):  
Li Qin Wang ◽  
Xiang Ni Yang ◽  
Xiu Li Zhao ◽  
Yang Han ◽  
Rui Jun Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Lamellar Structure ◽  
Degradation Rate ◽  
Mesoporous Structure ◽  
High Photocatalytic Activity ◽  
Type Iv ◽  
Zno Particles ◽  
Adsorption Desorption

The ZnO particles with mesoporous and lamellar structure were synthesized in the method of precipitation, using zinc acetate as precursor. The ZnO particles were characterized by the means of scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and N2 adsorption–desorption measurements. The photoactivity of as-prepared ZnO particles was evaluated by degradation experiment of methyl orange aqueous solution. The results showed the obtained ZnO particles were irregular polygons with lamellar structure, and the particle size was in the range of 50 nm to 300 nm. According to XRD and N2 absorption results, ZnO particles were pure and integrated crystals with high crystallinity, and adsorption-desorption isotherms correspond to the typical type IV isotherm with a hysteresis loop of type H3, which showed ZnO particles had mesoporous structure with slit pore shape. The ZnO particles had high photocatalytic activity, the maximum degradation rate of methyl orange aqueous solution can reach 99%. When reused for the fifth time, the photocatalytic activity of ZnO particles was similar with the fresh ones, and recycled for the tenth time, the degradation rate of methyl orange aqueous solution still standed by 84.7%.

Preparation of Bi1-xLaxVO4 and its Photocatalytic Degradation on Rhodamine B

2016 ◽  
Vol 852 ◽  
pp. 1473-1476
Author(s):  
Yan Ding ◽  
Liang Fang Fu ◽  
Yu Huan Wang ◽  
Liang Chao Li ◽  
Juan Bi Li
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Degradation Rate ◽  
Light Sensitivity ◽  
Structure Morphology ◽  
Photocatalytic Activities ◽  
Testing Techniques ◽  
Composition Structure

A series of photocatalyst Bi1-xLaxVO4 (0.1, 0.3, 0.5, 0.7) powders were prepared by hydrothermal method. The composition, structure, morphology and photocatalytic activity of the samples were researched by means of modern testing techniques. Bi1-xLaxVO4 showed excellent visible-light sensitivity and photocatalytic activities. The degradation rate of sample with x = 0.5 on rhodamine B reached 90 %, which was much higher than that of pure BiVO4.

Photocatalytic Activity of Transition Metal Doped Strontium Titanate Nanomaterial

2013 ◽  
Vol 700 ◽  
pp. 71-74
Author(s):  
Rui Ma ◽  
Wen Jie Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Strontium Titanate ◽  
Degradation Rate ◽  
Sol Gel ◽  
Slight Variation ◽  
Photocatalytic Activities ◽  
Method Effects ◽  
Degradation Activity ◽  
Metal Doped

Ce, Nd and Gd doped strontium titanate nanomaterial was prepared by a sol-gel method. Effects of transition metals doping on photocatalytic activities of the prepared materials were studied. The pure strontium titanate had photocatalytic degradation activity of 31.0%. The maximum degradation rate happened at Ce content of 20% and nearly 32.5% of the initial methyl orange was degraded on the material after 30 min of irradiation. Although there was a slight variation of photocatalytic degradation rate with the increasing Nd doping content, the materials doped with Nd had lower photocatalytic activity compared with pure strontium titanate. Nearly all the samples doped with Gd in the range up to 30% had much lower activity that the pure strontium titanate.

scholarly journals Development of Photocatalytic 3D-Printed Cementitious Mortars: Influence of the Curing, Spraying Time Gaps and TiO2 Coating Rates

Buildings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 381
Author(s):  
Behzad Zahabizadeh ◽  
Iran Rocha Segundo ◽  
João Pereira ◽  
Elisabete Freitas ◽  
Aires Camões ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Dark Condition ◽  
Photocatalytic Efficiency ◽  
3D Printed ◽  
As Adsorption ◽  
Time Periods ◽  
Coating Time ◽  
Sun Light ◽  
Curing Age

This work evaluated the photocatalytic activity of 3D-printed cementitious mortar specimens functionalized with TiO2 nanoparticles to obtain a multifunctional and smart concrete. This research aims to assess the influence of different parameters related to the functionalization process such as adsorption, coating time gaps, and coating rates on the degradation efficiency of the functionalized cementitious specimens. Each specimen was evaluated under the degradation of Rhodamine B (RhB) in an aqueous solution using a sun-light simulation. The obtained results showed a decrease in adsorption (under dark condition) with increasing the sample curing age. The highest photocatalytic efficiency was observed for coated samples aged 7 days. By increasing the coating rates, the photocatalytic efficiency is enhanced. Nonetheless, regardless of the coating rates, all the specimens showed an increase in photocatalytic efficiency for longer time periods of light exposition, i.e., after 8 h of irradiation.

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