Effect of the Mole Ratios of Zn2+:OH- on the Morphologies and Photocatalytic Activities of Ag/ZnO Photocatalysts

2014 ◽  
Vol 979 ◽  
pp. 180-183
Author(s):  
Pongsaton Amornpitoksuk ◽  
Sumetha Suwanboon
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Methylene Blue Solution ◽  
High Area ◽  
Photocatalytic Activities ◽  
Zno Particles ◽  
Zno Powders ◽  
Blue Solution ◽  
Hydrolysis Of ◽  
Better Than

Ag/ZnO powders were synthesized through hydrolysis of Zn2+ in an alkaline solution at various mole ratios of Zn2+:OH- without any stabilizer. At a mole ratio of Zn2+:OH- = 1:1.5, the ZnO particles showed as bi-hexagonal prisms. At higher OH- concentrations, the shape became spherical and then finally transformed to an agglomeration of platelet like-shapes at mole ratios of Zn2+:OH- = 1:5. The photocatalytic activity was investigated through degradation of a methylene blue solution. Under irradiation from blacklight fluorescence tubes, ZnO prepared from Zn2+:OH- = 1:1.5 was the best photocatalyst compared with those prepared from different mole ratios of Zn2+:OH-. This could be due to a high area of hexagonal facets as represented by the (0002) plane. By varying the amount of added Ag between 1-5 mol%, the ZnO prepared from 3 mol% of Ag showed the highest efficiency for photocatalytic degradation of methylene blue and its activity was also better than for pure ZnO.

Preparation and Characterization of Diatomite Supported Cu-Doped TiO2 Photocatalysts

2013 ◽  
Vol 853 ◽  
pp. 73-78
Author(s):  
Yan Xi Deng ◽  
Chuan Chuan Liu ◽  
Guang Yang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Methylene Blue Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Photocatalytic Activities ◽  
Blue Solution

Diatomite supported Cu-doped TiO2 photocatalysts were synthesized by sol-gel method and characterized by X-ray diffraction (XRD), SEM and UV-vis diffuses reflectance of spectroscopy (DRS). The photocatalytic activity was evaluated by photocatalytic degradation of methylene blue solution under visible light irradiation. The results show that TiO2/diatomite ratio had a great influene on their photocatalytic activities. All prepared Cu-TiO2/diatomite had a better photocatalytic activities in comparison with Cu-TiO2 and the Cu-TiO2(30)/diatomite had higher photocatalytic activity than others. The photocatalytic degradation of methylene blue is due to the breaking of the chormophoric group, rather than the simple decoloration.

Preparation and Photocatalytic Activity of TiO2/Opal Composite

2013 ◽  
Vol 668 ◽  
pp. 13-16
Author(s):  
Qing Shan Li ◽  
Biao Zhan ◽  
Wei Hong ◽  
Guang Zhong Xing
Keyword(s):  
Methylene Blue ◽  
Uv Light ◽  
Sol Gel ◽  
Tetrabutyl Titanate ◽  
Methylene Blue Solution ◽  
Photocatalytic Decolorization ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Blue Solution ◽  
Gel Technique

Opal as a carrier, tetrabutyl titanate as a titanium source, TiO2 loaded on opal was prepared by sol-gel technique. The photocatalysts were characterized by XRD, TEM and UV-VIS absorption spectrum. Their photocatalytic activities were examined by the photocatalytic decolorization of methylene blue solution under UV light irradiation. The effects of calcination temperature, the amount of TiO2 loading and pH on photocatalytic activities were discussed. The results show that TiO2 supported on opal induced enhancement of photocatalytic decolorization rant and TiO2 doping is about 30 wt. % with 92.15% of decolorization rate at 700°C.

Dye Degradation Using Ag/ZnO Illuminated by Fluorescent Lamps

2015 ◽  
Vol 749 ◽  
pp. 206-210
Author(s):  
Pongsaton Amornpitoksuk ◽  
Sumetha Suwanboon
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Rhodamine B ◽  
Dye Degradation ◽  
Reactive Orange 16 ◽  
Fluorescent Lamps ◽  
Zno Powders ◽  
Reactive Orange ◽  
Better Than ◽  
Dye Solutions

Heterostructure of Ag/ZnO was synthesized by a reduction of Tollen’s reagent on ZnO powders. The photocatalytic activity of Ag/ZnO was investigated through the degradation of three different dye solutions (methylene blue, rhodamine B and reactive orange 16) under visible light using the fluorescent lamps with a 420 nm longpass filter. The efficiencies of dye degradations for all three dyes by Ag/ZnO are better than that of pure ZnO. Furthermore, the parameters including photocatalyst loadings and initial pHs of dye solutions were also studied. The photocatalytic degradations for all three dyes were increased with the increasing of catalyst loadings. The effect of pHs on photocatalytic activity of Ag/ZnO can be explained by the interaction between the charge on the surface of photocatalyst and the charge of dye ions.

Enhanced Photocatalytic Activities of Ag/ZnO Powders Modified by Diblock Copolymer

2013 ◽  
Vol 770 ◽  
pp. 34-37
Author(s):  
Pongsaton Amornpitoksuk ◽  
Sumetha Suwanboon ◽  
Nantakan Muensit ◽  
Jonas Baltrusaitis
Keyword(s):  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Precipitation Method ◽  
X Ray ◽  
Photocatalytic Activities ◽  
Zno Powders ◽  
Blue Solution ◽  
Diffraction Patterns ◽  
Poly Ethylene ◽  
Zno Powder

Ag/ZnO powders were synthesized through a precipitation method, using poly(ethylene oxide)-block-poly(propylene oxide) as stabilizer. X-ray diffraction patterns of all prepared powders showed a mixed phase of Ag and ZnO. The existence of metallic Ag on the surface of all prepared ZnO powders was confirmed by X-ray photoelectron spectroscopy. Their photocatalytic activities were investigated through the degradation of a methylene blue solution under blacklight illumination. The Ag/ZnO prepared from the Zn2+ solution containing 7 mol% of Ag+ had the highest photocatalytic activity and this also showed better photocatalytic activity than a commercial ZnO powder.

Preparation and Visible-Light Photocatalytic Activity of TiO2 Nanotubes from a Hydrothermal Method

2011 ◽  
Vol 197-198 ◽  
pp. 786-789 ◽  
Author(s):  
Rui Liu ◽  
Wein Duo Yang ◽  
Hui Ju Chueng
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Raw Material ◽  
Methylene Blue Solution ◽  
Hydrothermal Temperature ◽  
Blue Solution ◽  
Visible Light Photocatalytic

TiO2 nanotubes were synthesized using TiO2 powder as raw material from a hydrothermal method. It was observed that the sample prepared at 130°C and calcined at 450°C only anatase formed, but the sample calcined at 800°C, both anatase and rutile formed. The obtained TiO2 nanotubes prepared at a hydrothermal temperature of 130°C and calcined at 450°C have a greater surface area of 356.8m2/g. Moreover, the TiO2 nanotubes demonstrate the photocatalytic degradation of methylene blue solution effectively by exposing the nanotubes in aqueous solution under visible light.

Study on Preparation and Properties of PA6/TiO2-GO Composites

2020 ◽  
Vol 1001 ◽  
pp. 224-228
Author(s):  
Dan Liu
Keyword(s):  
Mechanical Properties ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Breaking Strength ◽  
Degree Of Crystallinity ◽  
Methylene Blue Solution ◽  
Elongation At Break ◽  
Increasing Trend ◽  
Blue Solution ◽  
The Degree Of Crystallinity

In this paper, the effect of nanoTiO2 content on the thermal properties, mechanical properties, photocatalytic properties of PA6/TiO2-GO composites were investigated. The results indicated that the melting point of the composites decreased gradually with an increase of nanoTiO2 content, and the degree of crystallinity exhibited an increasing trend at first and then tended to decrease. Meanwhile, the breaking strength decreased gradually, whereas the elongation at break increased gradually. Moreover, the nanoTiO2 exhibited an increasing photocatalytic activity for degradation of the methylene blue solution. The incorporation of graphene oxide (GO) could effectively improve the photocatalytic effectiveness of nanoTiO2 by approximately 11%.

scholarly journals Significant improvement in TiO2 photocatalytic activity through controllable ZrO2 deposition

RSC Advances ◽  
2018 ◽  
Vol 8 (45) ◽  
pp. 25829-25834 ◽  
Author(s):  
Xiaofeng Wang ◽  
Rajankumar L. Patel ◽  
Xinhua Liang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Methylene Blue Solution ◽  
Blue Solution

The photocatalytic activity of ZrO2 deposited anatase TiO2 nanoparticles was evaluated based on the degradation of methylene blue solution under UV light.

Preparation and Properties of Photocalysts in ZnO/TiO2 System

2019 ◽  
Vol 800 ◽  
pp. 170-174
Author(s):  
Jānis Grabis ◽  
Anita Letlena ◽  
Inta Sīpola
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Phase Composition ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
Solar Light ◽  
Methylene Blue Solution ◽  
Titanium Butoxide ◽  
Blue Solution

ZnO/TiO2 nanocomposites with several ratio of the components were prepared by sol-gel method using titanium isopropoxide and titanium butoxide as titania precursors. Phase formation and photocatalytic activity of ZnO/TiO2 nanocomposites depend on ratio of the components and calcination temperature. The photocatalytic activity in dependence on calcination temperasture, phase composition was determined by degradation of methylene blue solution under Hg lamp and solar light imitating illumination. The highest photocatalytic activity showed ZnO/TiO2 nanocomposites containing 99 mol.% ZnO and 50 mol% ZnO when hexagonal ZnTiO3 phase was formed. ZnO/TiO2 nanocomposites exhibited enhanced photoactivity under solar light with respect to Hg lamp irradiation.

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