Preparation, Characterization and Photocatalytic Activities of ZnO/TiO2 Nanotube Composites

2011 ◽  
Vol 399-401 ◽  
pp. 1139-1142
Author(s):  
Jia Gui Li ◽  
Guo Cong Liu ◽  
Hui Dong
Keyword(s):  
Photocatalytic Activity ◽  
Zno Nps ◽  
Wurtzite Phase ◽  
Excellent Photocatalytic Activity ◽  
Photocatalytic Activities ◽  
Highly Dispersed ◽  
High Sedimentation ◽  
Nanotube Composites ◽  
Average Size ◽  
Hexagonal Wurtzite Phase

Highly dispersed ZnO/TiO2nanotube composites (NTCs) were successfully synthesized via a facile ethylenediamine-assisted deposition-precipitation route. This NTCs were characterized by XRD, TEM, and photcatalytic testing.The results revealed that hexagonal wurtzite phase ZnO NPs with an average size of about 2 nm were homogeneously dispersed and anchored on the surface of TiO2nanotubes (NTs) to form ZnO/TiO2NTCs, which exhibited excellent photocatalytic activity for photodegradation of methyl orange (MO) compared with P25 and Pure TiO2NTs. Furthermore, ZnO/TiO2NTCs possessed very favorable recycle efficiency due to their relatively high sedimentation rate and only slightly decrease of photocatalytic activity after a six- time recycle.

A facile wet chemical route to prepare ZnO/TiO2 nanotube composites and their photocatalytic activities

2010 ◽  
Vol 25 (7) ◽  
pp. 1278-1287 ◽  
Author(s):  
Lei Zhu ◽  
Guocong Liu ◽  
Xuechen Duan ◽  
Zhi Jian Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Zno Nps ◽  
Wurtzite Phase ◽  
Chemical Route ◽  
X Ray ◽  
Transmission Electron ◽  
Nanotube Composites ◽  
Electron Hole Pair ◽  
Average Size

Highly dispersed ZnO/TiO2 nanotube composites (NTCs) were successfully synthesized by a facile ethylenediamine-assisted deposition-precipitation route. The characterizations from x-ray diffraction, x-ray photoelectron spectroscopy, transmission electron microscopy, Brunauer–Emmett–Teller, Fourier transform infrared, and ultraviolet-visible spectra revealed that hexagonal wurtzite phase ZnO NPs with an average size of about 2 nm were homogeneously dispersed and anchored on the surface of TiO2 nanotubes (NTs) to form ZnO/TiO2 NTCs. The as-prepared ZnO/TiO2 NTCs with the atom ratio Zn/Ti of 1:4 exhibited excellent photocatalytic activity for photodegradation of methyl orange compared with P25 and pure TiO2 NTs, which were mainly caused by an increase of interfacial charge transfer reactions and a decrease of electron-hole pair recombination on ZnO-TNTs heterojunction. Furthermore, ZnO/TiO2 NTCs possessed favorable recycle efficiency due to their relatively high sedimentation rate and only a slight decrease of photocatalytic activity after a six time recycle.

V and F Codoped TiO2-SiO2 Composite Films for Enhanced Photocatalytic Activity

2014 ◽  
Vol 955-959 ◽  
pp. 2384-2387
Author(s):  
Ling Xiao Guan ◽  
Yao Yao
Keyword(s):  
Photocatalytic Activity ◽  
Composite Film ◽  
Surface Area ◽  
Composite Films ◽  
Bet Surface Area ◽  
Methyl Green ◽  
Simple Process ◽  
Vis Spectroscopy ◽  
Excellent Photocatalytic Activity ◽  
Photocatalytic Activities

A simple process was developed for preparation of highly photoactive V and F codoped TiO2-SiO2 composite film. The as-prepared specimens were characterized using Brunauer–Emmett–Teller (BET) surface area, photoluminescence (PL) spectra, and UV–Vis spectroscopy. The BET results revealed that the surface area of the modified TiO2 sample was 413 m2 g-1, while pure TiO2 103 m2 g-1. The PL results showed that the recombination rate of the photo-generated electrons and holes was effectively prohibited via the multi-modification. The photocatalytic activities of the films were evaluated by degradation of methyl green (MG) dye. Compared with pure TiO2 film, the multi-modified TiO2 film exhibited excellent photocatalytic activity and clearly responsive to the visible light. Keywords: V and F codoping; TiO2-SiO2 composite film; Photocatalytic activity

Synthesis and photocatalytic activities of two homochiral metal–organic frameworks with cages and hydrogen bonding helices

CrystEngComm ◽  
2020 ◽  
Vol 22 (25) ◽  
pp. 4206-4209 ◽  
Author(s):  
Zhan-Guo Jiang ◽  
Xin Wu ◽  
Zhong-Xuan Xu ◽  
Cai-Hong Zhan ◽  
Jian Zhang
Keyword(s):  
Hydrogen Bonding ◽  
Photocatalytic Activity ◽  
Metal Organic Frameworks ◽  
Excellent Photocatalytic Activity ◽  
Photocatalytic Activities ◽  
Metal Organic

Two homochiral metal–organic frameworks with M3L2 cages exhibit interesting hydrogen bonding helices and excellent photocatalytic activity.

Photocatalytic Degradation of Eosin B by ZnS Nanoparticles under Visible Light

2011 ◽  
Vol 236-238 ◽  
pp. 2080-2085 ◽  
Author(s):  
Chen Feng ◽  
Liu Ping Zheng ◽  
Gui Yang Yan ◽  
Meiu Qin Zheng
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Hexagonal Phase ◽  
Zns Nanoparticles ◽  
Eosin B ◽  
Photocatalytic Activities ◽  
Ft Ir ◽  
Average Size ◽  
20 Nm

Nanocrystalline ZnS particles were prepared by hydrothermal method and characterized by XRD, FT-IR, TEM and UV-vis DRS and their photocatalytic activities were evaluated by the photodegradation of Eosin B under visible light. The results showed that the ZnS nanoparticles we prepared were in hexagonal phase, their average size of the complex particles varies from 10 nm to 20 nm, and also revealed well photocatalytic activity under visible light, the photocatalytic decolouration rate of Eosin B in 3 h reached 70 %.

Construction of reduced graphene oxide-supported Ag–Cu2O composites with hierarchical structures for enhanced photocatalytic activities and recyclability

2015 ◽  
Vol 3 (11) ◽  
pp. 5923-5933 ◽  
Author(s):  
Li Xu ◽  
Fengying Zhang ◽  
Xinyu Song ◽  
Zhilei Yin ◽  
Yuxiang Bu
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hierarchical Structures ◽  
Reduced Graphene ◽  
Excellent Photocatalytic Activity ◽  
Photocatalytic Activities

The resultant ternary spherical Ag–Cu2O/rGO composite with complex heterostructures exhibited excellent photocatalytic activity and higher stability.

Hydrothermal Synthesis and Visible-Light-Driven Photocatalytic Activities of Bi2WO6 Uniform Hierarchical Microspheres

2014 ◽  
Vol 887-888 ◽  
pp. 181-184
Author(s):  
Yan Lan ◽  
Xiong Wang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
Photo Degradation ◽  
Hierarchical Microspheres ◽  
Excellent Photocatalytic Activity ◽  
Photocatalytic Activities ◽  
Visible Light Driven

The microsphere Bi2WO6has been synthesized by a facile hydrothermal method by using Bi (NO3)35H2O, H40N10O41W125H2O and CO(NH2)2(urea) as the starting materials. The as-synthesized Bi2WO6was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM),BET and UV-vis absorption spectroscopy. The visible-light-responsive photocatalytic activity of Bi2WO6microspheres was evaluated by the photo-degradation of RhB under Xe lamp irradiation. The degradation is up to 96% in 3h. The results show that microsphere Bi2WO6exhibited excellent photocatalytic activity. The reasons for the high photocatalytic activity have been discussed carefully.

scholarly journals Photocatalytic Reduction of CO2to Methane on Pt/TiO2Nanosheet Porous Film

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Li Qiu-ye ◽  
Zong Lan-lan ◽  
Li Chen ◽  
Cao Yu-hui ◽  
Wang Xiao-dong ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Separation Efficiency ◽  
Pt Nanoparticles ◽  
Porous Film ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Porous Films ◽  
Transmission Electron ◽  
Excellent Photocatalytic Activity ◽  
Average Size

Anatase TiO2nanosheet porous films were prepared by calcination of the orthorhombic titanic acid films at 400°C. They showed an excellent photocatalytic activity for CO2photoreduction to methane, which should be related to their special porous structure and large Brunauer-Emmett-Teller (BET) surface area. In order to further improve the photocatalytic activity, Pt nanoparticles were loaded uniformly with the average size of 3-4 nm on TiO2porous films by the photoreduction method. It was found that the loading of Pt expanded the light absorption ability of the porous film and improved the transformation efficiency of CO2to methane. The conversion yield of CO2to methane on Pt/TiO2film reached 20.51 ppm/h·cm2. The Pt/TiO2nanosheet porous film was characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and ultraviolet-visible light diffuse reflectance spectra (UV-vis DRS). Moreover, the transient photocurrent-time curves showed that the Pt/TiO2nanosheet porous film exhibited higher photocurrent, indicating that the higher separation efficiency of the photogenerated charge carriers was achieved.

Nanocrystalline TiO2 Composte Films for Enhanced Photocatalytic Activity

2013 ◽  
Vol 457-458 ◽  
pp. 98-101
Author(s):  
Mei Li Dai ◽  
Ji Jun Feng ◽  
Fang Li ◽  
Ming Ming Yao
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Organic Dyes ◽  
Sol Gel ◽  
Visible Region ◽  
Light Response ◽  
Tetrabutyl Titanate ◽  
Excellent Photocatalytic Activity ◽  
Photocatalytic Activities ◽  
Scanning Electron

In order to extend light response of TiO2 into the visible region and enhance its photocatalytic activity, V and W surface codoped nanocrytalline TiO2 film was synthesized by the sol-gel method. Tetrabutyl titanate (Ti (OC4H9)4) was chosen as the precursor, and ammonium metavanadate or ammonium tungstate was chosen as vanadium or tungsten source. The high-resolution field emission scanning electron microscopy (FE-SEM) results revealed that the film was composed of uniform round-like nanoparticles with size smaller than 6 nm. The photocatalytic activities of TiO2 films were investigated by degradation of organic dyes in aqueous solutions. V and W codoped TiO2 film exhibited excellent photocatalytic activity compared to undoped TiO2 film or single doped TiO2 film. The improvement mechanism by V and W codoping was also discussed. Keywords: Nanocrystalline TiO2; Composte films; Photocatalytic activity

Mild synthesis of {001} facet predominated Bi2O2CO3 clusters with outstanding simulated sunlight photocatalytic activities

CrystEngComm ◽  
2016 ◽  
Vol 18 (20) ◽  
pp. 3683-3695 ◽  
Author(s):  
Li-Min Yang ◽  
Guo-Ying Zhang ◽  
Hai-Rong Wang ◽  
Xue Bai ◽  
Xing-Qi Shen ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Simulated Sunlight ◽  
Ultrathin Nanosheets ◽  
Excellent Photocatalytic Activity ◽  
Photocatalytic Activities ◽  
Template Free ◽  
Mild Temperature

Bi2O2CO3 clusters built up of ultrathin nanosheets with predominated {001} facets were facilely synthesized via a template-free hydrothermal strategy at a mild temperature of 60 °C and exhibit excellent photocatalytic activity.

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