Characterization and Photocatalytic Activity of Microspheres ZnO by Hydrothermal Method

2019 ◽  
Vol 814 ◽  
pp. 487-492
Author(s):  
Xi Hao Lin ◽  
Pei Song Tang ◽  
Bei Bei Wang ◽  
Hai Qiang Tang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Hydrothermal Method ◽  
Diffuse Reflectance Spectroscopy ◽  
Raw Materials ◽  
Average Diameter ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Excellent Photocatalytic Activity ◽  
Ultraviolet Light Irradiation

Using zinc acetate, glycerol alcohol and sodium hydroxide as principal raw materials, the ZnO microspheres were prepared by hydrothermal method at 200°C. The samples were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and diffuse reflectance spectroscopy (DRS). Using methyl orange as the degradation object, the photocatalytic activities and recycling stability of ZnO were characterized. The results show that ZnO samples are spherical and the average diameter is approximately 3-4μm. Moreover, the bandgap width is 3.1eV. Under ultraviolet light irradiation, it is testified that ZnO shows a excellent photocatalytic activity for the degradation of methyl orange. From experience, we can draw a conclusion that the ZnO samples were in line with first-order kinetics, with an apparent rate constant of 0.016min-1. At the same time, ZnO showed excellent recycling performance. Although the samples have been recycled three times, it still maintained high photocatalytic activity.

Preparation and Characterization of Nanocrystalline La2Ti2O7 by Microwave Assisted Process

2016 ◽  
Vol 852 ◽  
pp. 525-529 ◽  
Author(s):  
Ying Zhou ◽  
Zhi Yong Mei ◽  
Hai Shao Ye ◽  
Wen Wen Su ◽  
Xi Zhao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Uv Light ◽  
Raw Materials ◽  
Spherical Shape ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Microwave Assisted ◽  
Average Grain Size ◽  
Ft Ir

Using La (NO3)3·6H2O, TiCl4 , and citric acid as the main raw materials, nanocrystalline La2Ti2O7 samples were prepared by microwave assisted method. The structure and morphology of samples were characterized by thermogravimetric and differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier Transform Infrared (FT-IR) spectroscopy. The photocatalytic activity of La2Ti2O7 was studied for methyl orange (MO) used as simulated sewage. It was found that the single phase La2Ti2O7 could be obtained through the calcination of microwave processed La2Ti2O7 precursors at 600 °C. The resulted product had an approximate spherical shape and average grain size of 50 nm in diameter. Under UV light, the photocatalytic experiment indicated that the prepared La2Ti2O7 nanocrystalline had high photocatalytic activity for degradation of methyl orange.

scholarly journals Tuning the Morphology of Ag3PO4 Photocatalysts with an Elevated Concentration of KH2PO4

2019 ◽  
Vol 14 (3) ◽  
pp. 625 ◽  
Author(s):  
Khusnul Afifah ◽  
Roy Andreas ◽  
Dadan Hermawan ◽  
Uyi Sulaeman
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
High Photocatalytic Activity ◽  
Elevated Concentration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Defect Sites ◽  
Excellent Photocatalytic Activity

Tuning the morphology of Ag3PO4 photocatalysts with an elevated concentration of KH2PO4 have been successfully conducted. This photocatalyst was prepared by starting material of AgNO3 and KH2PO4.  The KH2PO4 aqueous solution with five concentrations of 0.10 M, 0.15 M, 0.30 M, 0.45 M, and 0.60 M was reacted with AgNO3 aqueous solution. The products were characterized using X-ray Diffraction (XRD), UV-Vis Diffuse Reflectance Spectroscopy (DRS), and Scanning Electron Microscopy (SEM). The concentration of KH2PO4 significantly affected the morphology, size, and crystallinity of catalyst. The morphology of Ag3PO4 may be tuned with the synthesis using an elevated concentration of KH2PO4. The sample with the synthesis using 0.15 M of KH2PO4 exhibited the excellent photocatalytic activity. The high photocatalytic activity was caused by the small size of mixed morphology of sphere and tetrahedron, high crystallinity and defect sites. Copyright © 2019 BCREC Group. All rights reserved 

Preparation and Characterization of YMnO3 by Microwave Assisted Process

2017 ◽  
Vol 748 ◽  
pp. 428-432 ◽  
Author(s):  
Fang Fang Peng ◽  
Min Min Jin ◽  
Chun Yu Long ◽  
Pei Song Tang ◽  
Hai Feng Chen
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Uv Light ◽  
Raw Materials ◽  
Manganese Acetate ◽  
Yttrium Nitrate ◽  
X Ray Diffraction ◽  
Microwave Assisted ◽  
Average Grain Size ◽  
Excellent Photocatalytic Activity

Using yttrium nitrate (Y(NO3)3·6H2O), manganese acetate (MnC4H6O4·4H2O), citric acid (C6H8O7·H2O) and urea (CH4N2O) as major raw materials, the YMnO3 was prepared by microwave assisted method. The structure and morphology of samples were characterized by thermogravimetric analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared (FT-IR). The results show that the YMnO3 was successfully prepared by microwave process and calcined from 750°C to 1050°C. When the calcination temperature is 850°C, the grain of YMnO3 has good uniformity and the average grain size of 80-100 nm. Under UV-light irradiation, the photocatalytic activity of YMnO3 was studied for methyl orange (MO) used as simulated sewage. The photocatalytic experiment show that the YMnO3 exhibited excellent photocatalytic activity for degradation methyl orange.

Preparation of LaVO4 by Microwave Process and its Photocatalytic Activity

2016 ◽  
Vol 852 ◽  
pp. 538-541
Author(s):  
Shu Yu Zhong ◽  
Hai Shao Ye ◽  
Ji Qi Jiang ◽  
Qian Yang ◽  
Pei Song Tang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Diffuse Reflectance Spectroscopy ◽  
Uv Light ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Uv Visible ◽  
Ft Ir Spectroscopy

Using La (NO3)3·6H2O, NH4VO3, citric acid as the main raw materials, nanocrystalline LaVO4 sample was prepared by microwave method. The structure and morphology of sample were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (DRS) and Fourier Transform Infrared (FT-IR) spectroscopy. The photocatalytic activity of LaVO4 was studied for methyl orange (MO) used as simulated sewage. The XRD and SEM showed that the particle size of LaVO4 was about 80-100 nm. The DRS showed that LaVO4 had optical absorption onset of 356 nm, indicating the optical band gap of 3.48 eV. The FT-IR showed that LaVO4 had vibration peaks of Fe-O and V-O bond. Under UV-light, the photocatalytic experiment indicated that the prepared LaVO4 nanocrystalline had highly photocatalytic activity for degradation of methyl orange.

Experimental Study on Photocatalytic Mercury Removal by Titanium Dioxide

2014 ◽  
Vol 1073-1076 ◽  
pp. 743-746
Author(s):  
Xian Li ◽  
Jiang Wu ◽  
Xue Mei Qi ◽  
Chao En Li ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Hollow Sphere ◽  
Flue Gas ◽  
Diffuse Reflectance Spectroscopy ◽  
Raw Materials ◽  
Anatase Phase ◽  
Elemental Mercury ◽  
Average Diameter ◽  
Photocatalytic Properties ◽  
X Ray Diffraction ◽  
Uv Visible

TiO2 hollow sphere was synthesized by hydrothermal method using Trifluoroacetic acid (TFA) and Ti (SO4)2 as raw materials. The photocatalytic properties of TiO2 hollow sphere were evaluated by the photocatalytic oxidization of elemental mercury (Hg0) in simulated flue gas. The as-prepared samples were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy and nitrogen sorption/desorption. The results show that only anatase phase for TiO2 the hollow sphere is obtained. The average diameter is about 800nm and the shell thickness was about 200nm. The sample prepared with TFA has better photocatalytic properties than P25.

scholarly journals The High Photocatalytic Activity of SnO2Nanoparticles Synthesized by Hydrothermal Method

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Pham Van Viet ◽  
Cao Minh Thi ◽  
Le Van Hieu
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Uv Illumination ◽  
Transmission Electron ◽  
Uv Visible ◽  
Tin Oxide Nanoparticles

Tin oxide nanoparticles (SnO2NPs) were prepared at low temperature by hydrothermal method. Synthesized SnO2NPs were confirmedviacharacterization techniques such as UV-visible spectroscopy (UV-vis), X-ray diffraction (XRD), and Transmission Electron Microscope (TEM). The synthesized nanoparticles were in the size of 3 nm and they have high photocatalytic activity. The result showed that SnO2NPs degraded 88.88% MB solution after 30 minutes of UV illumination and reached 90.0% for 120 minutes (2 hours) of UV illumination. Moreover, they degraded 79.26% MB solution after 90 minutes (1.5 hours) under assisted sunlight illumination.

Preparation and Characterization of Cu Loaded TiO2 Nanotube Arrays and their Photocatalytic Activity

2011 ◽  
Vol 364 ◽  
pp. 377-381 ◽  
Author(s):  
Syazwani Mohd Zaki ◽  
Srimala Sreekantan
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Anatase Phase ◽  
Average Diameter ◽  
Photoelectron Spectra ◽  
Nanotube Arrays ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
Wet Impregnation ◽  
X Ray

This paper described the preparation of Cu loaded TiO₂ nanotube arrays. Firstly, TiO₂ nanotube arrays were formed by anodization. Afterwards, the formed nanotube arrays were incorporated with Cu by wet impregnation method. The soaking time and concentration were varied to obtain an optimum set of parameter for Cu incorporation in TiO₂ nanotubes. After anodization, all samples were annealed at 400°C for 4 hours to obtain anatase phase. The nanotube arrays were characterized by field emission scanning electron microscopy (FESEM), x-ray diffraction (XRD) and x-ray photoelectron spectra (XPS). An average diameter 63.02 nm and length 12.15µm were obtained for TiO₂ nanotubes. The photocatalytic activity of these nanotubes were investigated with methyl orange (MO) and the TiO₂ nanotube prepared in 0.01M of Cu (NO₃)₂ solution within 3 hours demonstrates the highest photocatalytic activity with 83.6% degradation of methyl orange. Keywords: copper doping, wet impregnation, photocatalytic activity

Visible-Light Driven LaNiO3 Nanosized Photocatalysts Prepared by a Sol-Gel Process

2011 ◽  
Vol 279 ◽  
pp. 83-87 ◽  
Author(s):  
Pei Song Tang ◽  
He Sun ◽  
Feng Cao ◽  
Jin Tian Yang ◽  
Sheng Liang Ni ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Light Absorption ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Visible Light Absorption ◽  
Average Grain Size ◽  
Sol Gel Process

The LaNiO3 nanoparticles were prepared by a sol-gel process. The LaNiO3 nanoparticles were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffuse reflectance spectroscopy (DRS). XRD and SEM demonstrate the successful synthesis of single phase perovskite LaNiO3 and an average grain size of 80 nm in diameter. It was found that the as-prepared LaNiO3 shows strong visible-light absorption with absorption onset of 545 nm, indicating a narrow optical band gap of 2.28 eV. Consequently, LaNiO3 nanoparticles show high visible-light photocatalytic activity for decomposition of methyl orange in comparison with the commercial Degussa P25. The photocatalytic experiment shows the high photocatalytic activity for the decomposition of methyl orange under visible-light irradiation, which is attributed to the strong visible-light absorption.

Preparation YbFeO3 by Microwave Assisted Method and its Visible-Light Photocatalytic Activity

2013 ◽  
Vol 699 ◽  
pp. 708-711 ◽  
Author(s):  
Ling Xiang Jia ◽  
Jun Yue Zhu ◽  
Ting Ting Lin ◽  
Zhen Jiang ◽  
Chao Wan Tang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance Spectroscopy ◽  
High Photocatalytic Activity ◽  
Raw Material ◽  
X Ray Diffraction ◽  
Microwave Assisted ◽  
Average Grain Size ◽  
Uv Visible ◽  
Microwave Assisted Method

Using Yb(NO3)3•6H2O and Fe(NO3)3•9H2O as raw material, the YbFeO3 nanoparticles were synthesized by microwave assisted method. The YbFeO3 nanoparticles were characterized by thermogravimetry and differential thermal analysis (TG-DTA), powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (DRS). It was found that the prepared YbFeO3 show an average grain size of 80 nm in diameter, and strong visible-light absorption with absorption onset of 608 nm, indicating a narrow optical band gap of 2.04eV. Consequently, the YbFeO3 nanoparticles show high photocatalytic activity for decomposition of methylene blue under visible-light irradiation.

Microwave Synthesis and Photocatalytic Activity of CeVO4 Nanocrystalline

2014 ◽  
Vol 1081 ◽  
pp. 146-150 ◽  
Author(s):  
Cong Sen Wang ◽  
Xiao Dong Chen ◽  
Xue Hong Liao
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Raw Materials ◽  
Layer Structure ◽  
Sodium Dodecyl ◽  
X Ray Diffraction ◽  
Methylene Orange ◽  
Degradation Ratio ◽  
Cerium Vanadate

Cerium vanadate nanocrystalline was prepared by cerium nitrate, vanadium (V) oxide as raw materials and sodium dodecyl sulfate as surfactant under microwave irradiation. The sample was characterized by X-ray diffraction (XRD) and scanning electron micrograph (SEM). The XRD show that the as-prepared sample calcined at 773 K is tetragonal zircon, and the SEM graph show that the as-prepared CeVO4nanocrystalline is layer structure formated of small particles aggregation. We studied the photocatalytic activity of the as-prepared samples by using degradation of methyl orange in visible light. It shows that the photocatalytic activity of Cerium vanadate nanocrystalline was very well. The effects of different factors such as calcination temperature and the concentration of methyl orange on the characterization of CeVO4are discussed. It found that when the catalyst calcined at 873 K was 0.10 g, and 0.3 mL hydrogen peroxide joined as well as, pH was 2.0, the degradation ratio of CeVO4for methylene orange of 100 mL 20 mg/L reached 87% in 80 min.

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