Photocatalytic activity of polyvinyl borate/titanium dioxide composites for UV light degradation of organic pollutants

2018 ◽  
Vol 55 (5) ◽  
pp. 401-407 ◽  
Author(s):  
Ozcan Koysuren ◽  
H. Nagehan Koysuren
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Organic Pollutants ◽  
Uv Light

Photocatalytic Removal of 2,4-D Herbicide on Lanthanum Oxide-Modified Titanium Dioxide

2015 ◽  
Vol 1112 ◽  
pp. 168-171
Author(s):  
Wai Ruu Siah ◽  
Nur Azmina Roslan ◽  
Hendrik O. Lintang ◽  
Mustaffa Shamsuddin ◽  
Leny Yuliati
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Inductively Coupled Plasma ◽  
Lanthanum Oxide ◽  
Electrochemical Impedance ◽  
Uv Light ◽  
Photogenerated Electron ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Impregnation Method

Titanium dioxide (TiO2) has been recognized as an active photocatalyst for degradation of various organic pollutants. In this study, in order to improve the photocatalytic activity of TiO2, the effect of lanthanum oxide modification was investigated by using commercial P25 as the benchmark. Lanthanum oxide/P25 TiO2 composites with 0.1, 0.5, 1 and 5 mol% of La loadings were prepared via an impregnation method. The resultant composites were characterized by X-ray diffraction (XRD), UV-Vis absorption spectroscopy, transmission electron microscopy (TEM), inductively coupled plasma optical emission spectrometry (ICP-OES) and electrochemical impedance spectroscopy (EIS). It was confirmed that the addition of lanthanum oxide did not much affect the crystallinity, crystal structure and the morphology of P25 TiO2. The catalytic activities of the lanthanum oxide/P25 TiO2 catalysts were tested by using 2,4-dichlorophenoxyacetic acid (2,4-D) as the test pollutant and UV light as the irradiation source. The reaction was caried out for 1 hour at room temperature and the percentage removal was determined using a UV spectrophotometer. The results showed that La loading was an important factor that influenced the photocatalytic activity of the composites. After 1 hour reaction, the best catalyst with 0.1 mol% of La loading showed 24% higher photocatalytic activity than the unmodified P25 TiO2 catalyst. It is shown by EIS that the enhanced photocatalytic activity of the composites was due to the ability of lanthanum oxide in improving the charge separation of the photogenerated electron-hole pairs in TiO2.

scholarly journals Cobalt Oxide-Modified Titanium Dioxide Nanoparticle Photocatalyst for Degradation of 2,4-Dichlorophenoxyacetic Acid

2017 ◽  
Vol 17 (2) ◽  
pp. 284 ◽  
Author(s):  
Leny Yuliati ◽  
Nur Azmina Roslan ◽  
Wai Ruu Siah ◽  
Hendrik Oktendy Lintang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Cobalt Oxide ◽  
Uv Light ◽  
Dichlorophenoxyacetic Acid ◽  
Photocatalytic Reaction ◽  
Impregnation Method ◽  
Titanium Dioxide Nanoparticle ◽  
2,4 Dichlorophenoxyacetic Acid

2,4-dichlorophenoxyacetic acid (2,4-D) has been recognized as a possibly carcinogenic compound to human, therefore, 2,4-D should be treated before it is discharged to the environment. Photocatalytic degradation of 2,4-D has been proposed as one of the best methods that offer environmentally safe process. In the present research, titanium dioxide (TiO2) was modified with cobalt oxide (CoO) and tested for photocatalytic degradation of 2,4-D under UV light irradiation. Different amounts of CoO (0.1, 0.5, 1 and 5 mol%) were added onto TiO2 by an impregnation method. The photocatalytic reaction was monitored and analyzed by measurement of 2,4-D absorbance using UV spectrophotometer. After 1 h photocatalytic reaction, it was confirmed that the sample with low loading of 0.1 mol% gave the highest photocatalytic activity among the bare and modified TiO2 photocatalysts. The photocatalytic activity was decreased with the increase of CoO loading, suggesting that the optimum amount of CoO was an important factor to improve the performance of TiO2. Based on fluorescence spectroscopy, such addition of CoO resulted in the reduced emission intensity, which showed the successful decrease in the electron-hole recombination.

Hydrothermal Synthesis and Characterisation of Cu Doped TiO2 Nanotubes for Photocatalytic Degradation of Methyl Orange

2014 ◽  
Vol 911 ◽  
pp. 126-130 ◽  
Author(s):  
Mohd Hasmizam Razali ◽  
M.N. Ahmad-Fauzi ◽  
Abdul Rahman Mohamed ◽  
Srimala Sreekantan
Keyword(s):  
Electron Microscopy ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Uv Light ◽  
High Surface ◽  
High Surface Area ◽  
Morphological Studies ◽  
Doped Titanium Dioxide ◽  
Degradation Of Methyl Orange

Copper doped titanium dioxide (Cu-TiO2) nanotubes were synthesised by hydrothermal method. The samples were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and nitrogen gas adsorption. The photocatalytic activity of the copper doped titanium dioxide nanotubes was investigated by photodegradation of methyl orange under UV light. The structural and morphological studies showed that, the copper was incorporated into interstitial positions of the TiO2lattice to form a new phase of TiO2(hexagonal). The copper doped TiO2nanotubes possessed high surface area and pore volume, results high photocatalytic activity for degradation of methyl orange (MO).

scholarly journals Synthesis and Characterization of Active Carbon-Titanium Dioxide Composite

2019 ◽  
Vol 31 (5) ◽  
pp. 1176-1180
Author(s):  
Farah S. Daabool ◽  
Falah H. Hussein
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Activated Carbon ◽  
Uv Light ◽  
Titanium Dioxide Nanoparticles ◽  
Chemical Activation ◽  
Sol Gel ◽  
Chemical Properties ◽  
Growth Conditions ◽  
Activation Technique

Activated carbon was synthesized from Iraqi date palm seeds by physical and chemical activation technique under optimized growth conditions that allow the production of long, well aligned, high-quality activated carbon. Titanium dioxide nanoparticles were prepared using a sol gel method. The activated carbon/TiO2 composites were prepared using simple evaporation and a drying process. The structural, morphological and chemical properties of the prepared activated carbon, TiO2 and activated carbon/TiO2 composite were investigated by X-ray diffraction, Fourier transformed infrared and scanning electron microscope. The photocatalytic activity of activated carbon/TiO2 composite with 10 % of activated carbon was studied and compared with TiO2. The UV light photocatalytic activity was also evaluated by the photocatalytic degradation of phenol in an aqueous solution.

Hydrothermal Synthesis of Ag/Bi2O2CO3 Nanoflakes Photocatalysts with Bismuth Nitrate and Silver Oxalate as Precursors for Organic Pollutants Degradation

NANO ◽  
2021 ◽  
pp. 2150047
Author(s):  
Ying Liang ◽  
Ximiao Zhu ◽  
Weihua Feng ◽  
Cong Cheng ◽  
Jianzhang Fang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Organic Pollutants ◽  
Rhodamine B ◽  
Uv Light ◽  
Alkaline Condition ◽  
One Pot ◽  
Synthetic Process ◽  
Simultaneous Formation ◽  
Optimum Synthesis ◽  
Spr Effect

Bi2O2CO3 is a UV-light-driven photocatalyst. Bi2O2CO3 nanoflakes modified with plasmonic Ag nanoparticles (Ag/Bi2O2CO3) were obtained by a hydrothermal method. In the synthetic process, Ag2C2O4 worked as the Ag source and C source for the simultaneous formation of Ag particles and CO[Formula: see text]. The optimum synthesis condition was found at [Formula: see text]C for 16[Formula: see text]h under alkaline condition. The binary heterostructure was then used for degrading 2, 4-Dichlorophenol (2, 4-DCP) and Rhodamine B in visible light, with an efficiency of nearly 80% for 2, 4-DCP and 100% for Rhodamine B after 4[Formula: see text]h and 2[Formula: see text]h reaction, respectively. The binary heterostructure exhibited improved photocatalytic activity compared to that of individual Ag and Bi2O2CO3 due to Surface Plasmon Resonance (SPR) effect of Ag. Meanwhile, after five recycling experiments, Ag/Bi2O2CO3 showed higher photocatalytic activity and lower performance degradation in comparison with the one prepared by photo-reduction of Ag[Formula: see text] on Bi2O2CO3 nanoflakes. This indicated the advantage of one-pot synthetic method. This work is expected to provide an efficient photocatalyst for organic pollutants degradation.

Characterization and photocatalytic activity of vanadium-doped titanium dioxide nanocatalysts

2009 ◽  
Vol 59 (3) ◽  
pp. 523-530 ◽  
Author(s):  
Pei-Yi Chang ◽  
Chun-Hsin Huang ◽  
Ruey-an Doong
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Uv Light ◽  
Anatase Phase ◽  
Mesoporous Tio2 ◽  
Pluronic F127 ◽  
Visible Range ◽  
Sem Images ◽  
Doped Tio2

The vanadium (V)-doped mesoporous titanium dioxide (TiO2) nanoparticles with V/Ti ratios from 0–2 wt% were prepared using sol-gel method in the presence of triblock polymers, Pluronic F127. SEM images showed that the V-doped TiO2 nanoparticles were porous structures. The surface areas and pore sizes were in the range 85–107 m2/g and 12–14 nm, respectively. From XRPD, the V-doped mesoporous TiO2 after calcination at 500°C was mainly anatase phase, and the crystallite sizes were in the range 14–16 nm. TEM images showed that vanadia was doped both on the surface and in the lattice of anatase TiO2. A slight red-shift in wavelength absorption was observed when V/Ti ratio increased from 0 to 2 wt%. Addition of vanadium ion slightly decreased the photocatalytic activity of TiO2 toward the decolorization of MB under the illumination of UV light at 305 nm. However, a 1.6–1.8 times increase in rate constants for MB photodegradation was observed when 0.5–1.0 wt% V-doped TiO2 was illumined by solar simulator at AM 1.5. These results demonstrated that the doping of low concentrations of V ion into mesoporous TiO2 enhance the photocatalytic activity of mesoporous TiO2 towards photodecomposition of azo dye in the visible range.

scholarly journals Adsorption and photocatalytic activity of Cu-doped cellulose nanofibers/nano-titanium dioxide for different types of dyes

2020 ◽  
Vol 82 (8) ◽  
pp. 1665-1675
Author(s):  
Yumei Li ◽  
Ying Pan ◽  
Bin Zhang ◽  
Rongzhan Liu
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Degradation Mechanism ◽  
Cellulose Nanofibers ◽  
Reaction Medium ◽  
Precipitation Method ◽  
Cu Doping ◽  
Decolorization Efficiency ◽  
Nano Titanium Dioxide

Abstract Cu-doped cellulose nanofibers/nano-titanium dioxide (Cu-TOCN/TiO2) photocatalysts were prepared by the hydrolysis-precipitation method using TiCl4 as the source of titanium and cellulose nanofibers suspension as a reaction medium. The prepared photocatalysts were used to decolorize organic dyes (reactive brilliant red K-2BP and cationic red X-GRL) efficiently under the synergistic effect of simultaneous adsorption and photocatalysis. The combination of TOCN inhibited the growth of TiO2 crystals, reduced agglomeration and increased the specific surface area. When compared with TiO2, TOCN/TiO2 improved the decolorization efficiency of the two dyes by 14.82% and 22.87%, respectively, under UV-light irradiation. The absorption edge exhibited red-shift from 380 to 410 nm after Cu doping. An excellent photocatalytic activity was recorded by 0.5 mol % Cu-TOCN/TiO2 and the decolorization efficiency of the two dyes was further improved by 34.76% and 10.44% respectively, compared with no Cu doping. After 2 hours of irradiation, the decolorization efficiency reached 96.57% and 99.73% respectively, while under dark conditions, it was 47.64% and 91.56% for the two dyes. The degradation mechanism of the dyes was verified as the destruction of the azo chromophore and benzene ring. This work provides a potential method for the development of a novel adsorptive photocatalyst with excellent recyclability.

Investigation of the photocatalytic activity of titanium dioxide films under visible light measured by electrospray mass spectrometry

2018 ◽  
Vol 42 (22) ◽  
pp. 18259-18268 ◽  
Author(s):  
Diego H. P. Souza ◽  
Robson R. Guimarães ◽  
Thiago C. Correra ◽  
Vitor M. Zamarion
Keyword(s):  
Mass Spectrometry ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Organic Pollutants ◽  
Electrospray Mass Spectrometry ◽  
Esi Ms ◽  
Titanium Dioxide Films

Pure TiO2 P-25 films demonstrate effective photodegradation activity of organic pollutants under the incidence of visible light observed via ESI(−)-MS.

Role of lanthanum species in improving the photocatalytic activity of titanium dioxide

2017 ◽  
Vol 7 (1) ◽  
pp. 159-167 ◽  
Author(s):  
Wai Ruu Siah ◽  
Hendrik O. Lintang ◽  
Leny Yuliati
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Uv Light ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Additional Formation

Lanthanum modification resulted in the additional formation of Ti3+ states, which enhanced the charge transfer and separation. Consequently, the photocatalytic activity of TiO2 under UV light irradiation was significantly improved.

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