scholarly journals Modified Sol-Gel Synthesis of Carbon Nanotubes Supported Titania Composites with Enhanced Visible Light Induced Photocatalytic Activity

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Quanjie Wang ◽  
Yanqing Wang ◽  
Baorong Duan ◽  
Mengmeng Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Photocatalytic Activity ◽  
Carbon Nanotube ◽  
Visible Light ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Raw Material ◽  
Tetrabutyl Titanate ◽  
Multiwalled Carbon ◽  
Photodegradation Efficiency

Multiwalled carbon nanotube (MWCNT) enhanced MWCNT/TiO2nanocomposites were synthesized by surface coating of carbon nanotube with mixed phase of anatase and rutile TiO2through a modified sol-gel approach using tetrabutyl titanate as raw material. The morphological structures and physicochemical properties of the nanocomposites were characterized by FT-IR, XRD, DTA-TG, TEM, and UV-Vis spectra. The results show that TiO2nanoparticles with size of around 15 nm are closely attached on the sidewall of MWCNT. The nanocomposites possess good absorption properties not only in the ultraviolet but also in the visible light region. Under irradiation of ultraviolet lamp, the prepared composites have the highest photodegradation efficiency of 83% within 4 hours towards the degradation of Methyl Orange (MO) aqueous solution. The results indicate that the carbon nanotubes supported TiO2nanocomposites exhibit high photocatalytic activity and stability, showing great potentials in the treatment of wastewater.

Preparation and Photocatalytic Activity of Bi Doped TiO2 with Visible-Light Response

2012 ◽  
Vol 550-553 ◽  
pp. 404-410
Author(s):  
Hua Jun Chen ◽  
Xiao Jing Xi ◽  
Dong Li ◽  
Rui Wang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Response ◽  
High Photocatalytic Activity ◽  
Raw Material ◽  
Tetrabutyl Titanate ◽  
X Ray ◽  
Visible Light Response ◽  
Transmission Electron ◽  
Bi Doping

A Bi-TiO2 composite with high photocatalytic activity was prepared using tetrabutyl titanate and bismuth nitrate as raw material by hydrothermal method. The structure was characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), X-ray energy dispersive spectroscopy(EDS), X-ray fluorescence(XRF) and UV-vis diffuse reflectance spectrophotometer(UV-vis DRS). The results show that anatase nanometer titanium dioxide was prepared, in which Bi3+ take the place of Ti4+. The surface area of the sample was higher, ca.312.6m2•g-1. Bi doping caused red-shift of the absorption spectrum, and the composite has better Visible-light Response. Bi-TiO2 shows higher photocatalytic avtivity to the degradation of resorcinol than pure TiO2. The optimum value of Bi doped was 1.00 %. After 120 minutes illuminating under 70W Halide Lamps, degradation rate of resorcinol can get to 100%.

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.

Nanocomposites of Multi-Walled Carbon Nanotubes with TiO2 for High Photocatalytic Activity

2014 ◽  
Vol 925 ◽  
pp. 13-17
Author(s):  
Tong Ling Tan ◽  
Chin Wei Lai ◽  
Sharifah Bee Abd Hamid
Keyword(s):  
Carbon Nanotubes ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Titanium Isopropoxide ◽  
High Photocatalytic Activity ◽  
Light Region ◽  
Multi Walled Carbon Nanotubes ◽  
Uv Visible ◽  
Walled Carbon Nanotubes

Multi-walled Carbon Nanotubes (MWCNTs) coupled with TiO2 nanoparticles was successfully synthesized using sol-gel method at room temperature. Titanium isopropoxide and MWCNTs were selected as starting materials. The presence of anatase TiO2 phase in the MWCNTs/TiO2 composites was determined by XRD analysis. In addition, FTIR analysis was conducted to determine the chemical bonding of MWCNTs/TiO2 composites. Interestingly, it was found that the shifting of absorption edges of TiO2 nanoparticles towards to the visible-light region due to the incorporation of MWCNTs using UV-Visible spectroscopy. The photocatalytic activity of MWCNTs/TiO2 nanocomposites was demonstrated by the Rhodamine B degradation.

Nonporous Nitrogen and Ruthenium Co-Doped Titania Films for Photocatalysis

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940043 ◽  
Author(s):  
O. Linnik ◽  
L. Khoroshko
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Structural Properties ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Gel Technique ◽  
Titania Films ◽  
Doped Titania ◽  
Co Doped

Nitrogen and ruthenium co-doped titania films synthesized by sol–gel technique exhibit high photocatalytic activity under both UV and visible light. Incorporation of nitrogen and ruthenium ions in titania lattice is proven by XPS. Both doping agents affected the structural properties of the films.

Synthesis of Sn4+ Doped TiO2 Nanotube and its Photocatalytic Activity

2012 ◽  
Vol 724 ◽  
pp. 21-24
Author(s):  
Hong Ying Dong ◽  
Yan Ping Ren ◽  
Kai Ming Huang ◽  
Wei Yan He ◽  
Wen Ma
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Stable Phase ◽  
Visible Light Region ◽  
Composite Fibers ◽  
Small Particles ◽  
Electrospinning Technique ◽  
Photodegradation Efficiency ◽  
Light Region

The PVP+Ti (OC4H9)4+SnCl4·5H2O/sesame oil composite fibers were successfully prepared by a sol-gel method combined with a coaxial electrospinning technique. The Sn4+/TiO2 nanotubes were obtained by calcining the above-mentioned composite fibers and characterized by XRD and TEM. XRD results show that increasing reaction temperature facilitates to form a stable phase. TEM results show that the Sn4+/TiO2 nanotubes have smooth surface with wall thickness of ~120 nm and are composed of small particles of ~5 nm. The photocatalytic activity of Sn4+/TiO2 nanotubes was investigated. The photodegradation efficiency of Sn4+/TiO2 nanotubes decreases in UV region but increases in visible light region. The photocatalytic properties of three 0.52at% Sn4+/TiO2 nanomaterials with different morphologies were also evaluated. The photodegradation efficiencies of Sn4+/TiO2 nanopowers, Sn4+/TiO2 nanofibers and Sn4+/TiO2 nanotubes increase in visible light region in sequence. In summary, chemical modification by doping Sn4+ and morphology changing for TiO2 can improve its photocatalytic activity in visible light region significantly.

Facile Synthesis of r-GO @Pd/TiO2 Nanocomposites and Its Photocatalytic Activity Under Visible Light

2016 ◽  
Vol 16 (4) ◽  
pp. 3557-3563 ◽  
Author(s):  
Anh Quang Dao ◽  
Bijuan Zheng ◽  
Hongwei Liu ◽  
Shuang Dong ◽  
Thanh Tuyen Le Thi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Wastewater Treatment ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Catalytic Efficiency ◽  
Average Crystallite Size ◽  
High Photocatalytic Activity ◽  
Synthesis Conditions

Reduced Graphene Oxide Wrapped Pd/TiO2 (r-GO@Pd/TiO2) which exhibited high photocatalytic activity under visible light was synthesized from commercial chemicals. The classic sol–gel method and the Ar gas bubbling composition was used in the preparation of the catalyst. Furthermore, the best Pd-doping concentration in crystals, the wrapping concentration of r-GO over nanoparticles, and the optimal calcination temperature were investigated to enhance the photocatalytic activity of the hybrid catalyst. The experimental results showed that the catalytic efficiency of r-GO@Pd/TiO2 reached maximum value at the optimum synthesis conditions: 0.7 wt% Pd-doped TiO2 by sol–gel process, calcination temperature of 550 °C, 1 mg of GO for 100 gram wrapped Pd/TiO2. X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) techniques were conducted to determine the nanostructure of the catalysts. The average crystallite size of nanoparticles was 14 nm with perfect dispersion of Pd dots and wraps of r-GO membrane. Methyl Blue was used as an organic dye model to test the ability in wastewater treatment of the catalysts. A comparison between different catalysts’ characteristics was also studied. The r-GO@Pd/TiO2 showed a higher photocatalytic activity compared to Pd/TiO2 and commercial P25. Additionally, the complete dye reduction under visible light excitation indicated that wrapping r-GO round Pd/TiO2 improved the photocatalytic activity of catalysts. The determination of the stability of r-GO@Pd/TiO2 showed that its photocatalysis was persistent over several times of recycling examination. Therefore, r-GO@Pd/TiO2 in wastewater treatment.

Synthesis and Performance Characterization of Highly Active Samarium Doped TiO2 Nanopowder

2014 ◽  
Vol 633 ◽  
pp. 21-25
Author(s):  
Jing Xu
Keyword(s):  
Visible Light ◽  
Calcination Temperature ◽  
Raw Materials ◽  
Synergistic Effects ◽  
Sol Gel ◽  
Methyl Orange Solution ◽  
Raw Material ◽  
Tetrabutyl Titanate ◽  
Solution Rate ◽  
Preparation Process

In the experiment, the tetrabutyl titanate and samarium trinitrate were used as raw material, samarium doped TiO2 powder was prepared by sol-gel method. Main factors that affect the TiO2 nanoparticles, such as catalyst, ratio of raw materials, and calcination temperature of the preparation process were studied. TiO2 powder was characterized by using XRD, UV-vis, IR to determine the crystal structure, grain size and spectral properties. The results show that, the amount of catalyst is 50mg, the calcination temperature is 500 °C, samarium doping ratio is 0.4%, and the visible light photocatalytic degradation time at 60min, the degradation of methyl orange solution rate of 20mg/L can reach 42.8%. Samples with anatase as the main, in the catalyst preparation process, due to the synergistic effects of samarium doping, the modified TiO2 absorption band of different redshift, enhanced the catalytic activity of TiO2 visible light.

Sign in / Sign up

Export Citation Format

Share Document