Preparation of TiO2/ZnO composite catalysts and their photocatalytic activity for degradation of pentachlorophenol

2017 ◽  
Vol 14 (4) ◽  
pp. 279-283 ◽  
Author(s):  
Juan Xie ◽  
Yongjing Hao ◽  
Meixia Li ◽  
Yiwei Lian ◽  
Li Bian
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Organic Pollutant ◽  
Ultra Violet ◽  
X Ray Diffraction ◽  
Content Type ◽  
Composite Catalysts ◽  
Uv Light Irradiation ◽  
Excellent Photocatalytic Activity ◽  
Good Catalytic Activity

Purpose This paper aims to report a novel preparation method of titanium dioxide (TiO2)/zinc oxide (ZnO) composites with different mole ratios of TiO2:ZnO and their photocatalytic activity. Design/methodology/approach TiO2/ZnO composites are prepared by a facile route. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) and ultra-violet–visible diffuse reflectance spectra (UV-vis DRS) are used to characterize the products. Photocatalytic activity of the samples is evaluated by degradation of persistent organic pollutant pentachlorophenol under ultra-violet (UV) irradiation. Findings It is found that all the as-prepared TiO2/ZnO composites not only have good catalytic activity under UV light irradiation, but also have excellent circulation stability. The optimal mole ratio of TiO2:ZnO is 0.75:1. Originality/value This report presents a simple and rapid method for the preparation of TiO2/ZnO composites with excellent photocatalytic activity. Experimental results could provide useful reference for the treatment of chlorophenols in the future.

scholarly journals Preparation and Photocatalytic Activity of TiO2/Fine Char for Removal of Rhodamine B

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Mingjie Ma ◽  
Weijie Guo ◽  
Zhengpeng Yang ◽  
Shanxiu Huang ◽  
Guanyu Wang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Uv Light ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Light Illumination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation

TiO2/fine char (FC) photocatalyst was prepared via sol-gel method with tetrabutyl titanate as the precursor and FC as the carrier. The structural property of TiO2/FC photocatalyst was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and the photocatalytic activity of TiO2/FC was evaluated by photocatalytic degradation of rhodamine B (RhB) aqueous solution under UV light irradiation. The results showed that TiO2was successfully coated on the surface of FC, and the TiO2/FC photocatalyst had better photocatalytic efficiency and stability for degradation of RhB under UV light illumination as compared to that of the pure TiO2and FC. The study provided a novel way for the application of FC to the photocatalytic degradation of organic wastes.

Effect of Fe Incorporation on the Photocatalytic Activity of TiO2 by Sol-Gel Method

2015 ◽  
Vol 1087 ◽  
pp. 218-222
Author(s):  
Siti Aida Ibrahim ◽  
Srimala Sreekantan
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Sol Gel ◽  
Combination Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Vis Spectroscopy ◽  
Visible Irradiation ◽  
Emission Microscopy

Nanostructured Fe-TiO2 and TiO2 with anatase structure were synthesized via combination method of sol-gel and peptization process. The samples were characterized by X-ray diffraction (XRD), Transmission emission microscopy (TEM) and UV-Vis spectroscopy (UV-Vis). The presence of Fe3+ ion shifted the absorption profile of TiO2 to the longer wavelength side of the spectrum, indicating an obvious photocatalytic activity under visible irradiation. Photocatalytic activity of the samples were evaluated by methyl orange (MO) discolouration under UV-light irradiation. Compared with the pure TiO2 nanoparticles, the Fe-TiO2 nanoparticles exhibited higher photocatalytic activity with 95% discoloration within 2 h.

scholarly journals Effects of mechanical activation on structure and photocatalytic properties of ZnO powders

2013 ◽  
Vol 11 (11) ◽  
pp. 1780-1785 ◽  
Author(s):  
Maria Gancheva ◽  
Reni Iordanova ◽  
Yanko Dimitriev ◽  
Georgi Avdeev ◽  
Tzvetoslav Iliev
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Reflectance Spectroscopy ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Time Intervals ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Band Position ◽  
Zno Powders

AbstractZinc oxide (ZnO) was mechanically activated in air using a planetary ball mill using varying milling speeds and time. The obtained samples were analyzed by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and UV-Vis diffusion reflectance spectroscopy. The photocatalytic activity of the mechanically treated ZnO powders were investigated in the reaction of Malachite Green (MG) degradation in aqueous solution under UV-light irradiation. A decrease in the crystallite size (from 90 to 10 nm) accompanied by an increase of microstrains and lattice parameters were established applying different milling speeds. The agglomeration of the particles was observed by SEM analysis. The absorption spectra of the initial and mechanically activated ZnO samples show shifting of the band position from 360 to 330 nm, which can be related to decrease in the crystalline size. The ZnO powders activated at lower milling speeds (for shorter time intervals) exhibit highest photocatalytic activity.

Synthesis of Composite TiO2/Natural Cotton Cellulose Nanofiber with Photocatalytic Property

2014 ◽  
Vol 665 ◽  
pp. 393-396
Author(s):  
Qiu Yan Liu ◽  
Jing Li ◽  
Jun Cao ◽  
Chao Rong Li
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Organic Pollutant ◽  
Sol Gel ◽  
Photocatalytic Property ◽  
Important Application ◽  
Anatase Structure ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Hydrothermal Methods

TiO2/NCCN nanocomposites have been prepared by sol-gel and hydrothermal methods. Firstly, the NCCN was prepared by electrospinning technology, then the amorphous TiO2films were coated on the surface of the NCCN by a sol-gel method, and TiO2(anatase structure) nanoparticles could be fixed on the surface of NCCN by a hydrothermal method to get higher photocatalysis efficiency. The photocatalytic activities indicate that the TiO2/NCCN nanocomposites exhibited a good photocatalytic activity for photodegradation of methylthionine chloride (MO) solution under UV light irradiation, leading to an important application in photodegradation of organic pollutant.

Highly enhanced photocatalytic properties of ZnS nanowires–graphene nanocomposites

RSC Advances ◽  
2014 ◽  
Vol 4 (58) ◽  
pp. 30798-30806 ◽  
Author(s):  
Jian Cao ◽  
Qianyu Liu ◽  
Donglai Han ◽  
Shuo Yang ◽  
Jinghai Yang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Light Irradiation ◽  
Photocatalytic Properties ◽  
Graphene Nanocomposites ◽  
Uv Light Irradiation ◽  
Excellent Photocatalytic Activity

ZnS–graphene nanocomposites exhibit excellent photocatalytic activity for degradation of methylene blue under UV light irradiation.

UV-Light Absorption and Photocatalytic Properties of Zn-Doped CeO2 Nanopowders Prepared by Ultrasound Irradiation

2015 ◽  
Vol 827 ◽  
pp. 56-61 ◽  
Author(s):  
Aula Fitra Efendi ◽  
Iis Nurhasanah
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Ultra Violet ◽  
Ammonium Hydroxide ◽  
Ultrasound Irradiation ◽  
Xrd Analysis ◽  
Zinc Nitrate ◽  
X Ray Diffraction ◽  
Ultrasound Waves ◽  
Isopropanol Solution

Ceria (CeO2) nanopowders doped with various Zinc (Zn) compositions were synthesized from solution by irradiating ultrasound waves. Ultrasound waves were irradiated to aqueous/isopropanol solution of cerium nitrate and zinc nitrate mixtures. Aqueous solution of ammonium hydroxide was droped into that solution until pH becomes 10. Dried precipitates were calcinated at 100°C to form CeO2 nanopowders. X-ray Diffraction (XRD) analysis shows the CeO2 nanopowder possess fluorite cubic structure. Ultrasound irradiation resulted in nanometric powder of CeO2 with spherical in shape. The addition of Zn into CeO2 reduces the particle size and shows strong absorbance in the ultra–violet (UV) region. Moreover, the addition of 20 mol% Zn is inhibiting photocatalytic activity of CeO2 under sunlight irradiation. These results suggest that Zn-doped CeO2 is more promising for UV radiation protection with no presence photocatalytic activity.

Effects of Hydrothermal Crystallization on the Morphologies and Photocatalytic Activity of TiO2 Nanotubes

2013 ◽  
Vol 631-632 ◽  
pp. 504-510
Author(s):  
Su Qin Liu ◽  
Ying Liang
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Treatment ◽  
Uv Light ◽  
Hydrothermal Condition ◽  
Electrochemical Anodization ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Hydrothermal Temperature ◽  
Uv Light Irradiation ◽  
Anatase Titania

Anatase titania (TiO2) films with highly photocatalytic activity were prepared by hydrothermal treatment of amorphous TiO2 nanotubes (NTs) via electrochemical anodization of titanium (Ti) in fluorine-containing electrolyte. The as-prepared TiO2 films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). The photocatalytic activity of the as-prepared TiO2 films was evaluated by the photocatalytic degradation of methyl orange (MO) aqueous under UV-light irradiation. The effects of hydrothermal temperature and time on the morphologies, microstructure and photocatalytic activity of TiO2 films were investigated and discussed. It was found that TiO2 NTs were converted to nanoparticles after hydrothermal treatment. The mechanism of deformation of TiO2 NTs was discussed. Hydrothermal treatment enhances the phase transformation of TiO2 films from amorphous to anatase and crystallization of anatase. An optimal hydrothermal condition (150 oC for 8 h) was determined. The anatase TiO2 films prepared under optimal hydrothermal conditions posses larger surface area and higher relative anatase crystallinity and its photocatalytic activity is higher than that of anatase TiO2 films prepared under other hydrothermal conditions.

Freestanding single layers of non-layered material γ-Ga2O3 as an efficient photocatalyst for overall water splitting

2017 ◽  
Vol 5 (20) ◽  
pp. 9702-9708 ◽  
Author(s):  
Xiaoyan Zhang ◽  
Zizhong Zhang ◽  
Jun Liang ◽  
Yangen Zhou ◽  
Yuecong Tong ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Water Splitting ◽  
Uv Light ◽  
Layered Material ◽  
Light Irradiation ◽  
Overall Water Splitting ◽  
Uv Light Irradiation ◽  
Excellent Photocatalytic Activity

Non-layered γ-Ga2O3 nanosheets were firstly prepared through a facile method and exhibited excellent photocatalytic activity of water splitting under UV light irradiation.

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.

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