Photo-Degradation of Acid Red 18 by Using TiO2/SO42- Nanoparticles under UV Light

2012 ◽  
Vol 189 ◽  
pp. 52-57 ◽  
Author(s):  
Jian Feng Wang ◽  
Jin Hai Zhao ◽  
Xue Xue Liu ◽  
Shou Heng Zhang ◽  
Dong Yan Wei ◽  
...  
Keyword(s):  
Uv Light ◽  
Irradiation Time ◽  
Sol Gel ◽  
Pure Titanium ◽  
Titanium Isopropoxide ◽  
Hydrolysis Rate ◽  
Bet Surface Area ◽  
Solution Ph ◽  
Photo Degradation ◽  
Degradation Temperature

Photocatalyst TiO2/SO42- nanoparticles were synthesized by sol-gel method via hydrolysis of pure titanium isopropoxide in n-propanol and acetylacetone solution. The hydrolysis rate and condensation rate of titanium isopropoxide were controlled by concentrated sulfuric acid. Its catalytic activities on the photo-degradation of acid red 18 which is acid azo dyes were studied experimentally and theoretically. The catalysts were characterized by XRD (X-ray diffraction), IR (infrared radiation), BET surface area and SEM (scanning electron microscope). The effects of various catalytic degradation factors of nanocrystalline TiO2/SO42- were discussed in the present paper, which included solution pH, initial concentration of acid red 18, UV irradiation time and the reaction temperature. The results showed that the photo-catalytic activity of this material was obvious significantly when pH is 7.0; degradation temperature is 25 °C and irradiation time is 90 minutes for different concentration acid red 18 solutions.

UV Curable Organic-Inorganic Hybrid Materials

2000 ◽  
Vol 628 ◽  
Author(s):  
Guang-Way Jang ◽  
Ren-Jye Wu ◽  
Yuung-Ching Sheen ◽  
Ya-Hui Lin ◽  
Chi-Jung Chang
Keyword(s):  
Hybrid Materials ◽  
Colloidal Silica ◽  
Sol Gel ◽  
Solution Ph ◽  
Uv Curable ◽  
Inorganic Hybrid ◽  
Degradation Temperature ◽  
Sol Gel Process ◽  
The Stability ◽  
Thermal Degradation Temperature

This work successfully prepared an UV curable organic-inorganic hybrid material consisting of organic modified colloidal silica. Applications of UV curable organic-inorganic hybrid materials include abrasion resistant coatings, photo-patternable thin films and waveguides. Colloidal silica containing reactive functional groups were also prepared by reacting organic silane and tetraethyl orthosilicate (TEOS) using sol-gel process. In addition, the efficiency of grafting organic moiety onto silica nanoparticles was investigated by applying TGA and FTIR techniques. Experimental results indicated a strong interdependence between surface modification efficiency and solution pH. Acrylate-SiO2 hybrid formation could result in a shifting of thermal degradation temperature of organic component from about 200°C to near 400°C. In addition, the stability of organic modified colloidal silica in UV curable formula and the physical properties of resulting coatings were discussed. Furthermore, the morphology of organic modified colloidal silica was investigated by performing TEM and SEM studies‥

scholarly journals Pengaruh Laju Penginjeksian Doping Fluor terhadap Aktivitas Fotokatalis Nanotitania Menggunakan Metode Sol Gel

2020 ◽  
Vol 8 (2) ◽  
pp. 209-218
Author(s):  
Sri Rahayu ◽  
◽  
Posman Manurung ◽  
Roniyus Marjunus ◽  
◽  
...  
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Tween 80 ◽  
Ammonium Fluoride ◽  
Sintered Sample ◽  
Titanium Isopropoxide ◽  
Injection Rate ◽  
Particle Sizes ◽  
Fluorine Doping ◽  
Transmission Electron

The titania synthesis of fluorine doping (F-TiO2) was carried out through the sol-gel method. Titanium isopropoxide (TTIP), tween-80, isopropanol and ammonium fluoride (NH4F) as sources of doping fluorine were used as the main ingredients. This research aimed to study the effect of fluorine doping injection rate using injection pumps on F-TiO2 photocatalyst activity. Four fluorine doping samples were prepared with the respective penetration rate of 0.4 ml / 30 minutes; 0.4 ml / 60 minutes; 0.4 ml / 90 minutes and 0.4 ml / 120 minutes. The titania powder was calcined at 450 oC for 5 hours. The sintered sample was tested for photodegradation of remazol yellow under UV light. Physical characteristics were analyzed using transmission electron microscopy (TEM) and Uv-Vis spectrophotometer. The results of the UV-Vis spectrophotometer showed that the particle size of samples with an injection rate of 0.4 ml / 90 minutes showed higher photocatalyst activity with particle sizes of (14 nm ± 4 nm).

Degradation of Pharmaceutical Pollutants under UV Light using TiO2 Nanomaterial Synthesized through Reverse Micelle Nanodomains

2021 ◽  
pp. 87-110
Keyword(s):  
Wastewater Treatment ◽  
Reverse Micelle ◽  
Uv Light ◽  
Sol Gel ◽  
Bet Surface Area ◽  
Tio2 Photocatalyst ◽  
Gel Method ◽  
Sol Gel Method ◽  
Treatment Techniques ◽  
Pharmaceutical Pollutants

Controlling water pollution are huge challenges throughout the world especially concerning pharmaceutical pollutants. Common practices at industrial wastewater treatment facilities need to be upgraded with advanced wastewater treatment techniques. TiO2 based photocatalytic processes have shown great potential for removal of these aqueous pharmaceutical pollutants. Reverse micelle based modified sol-gel method is utilized for the synthesis of TiO2 nanomaterial. Generated reverse micelle nanodomains have controlled size and particle size distribution (PSD) of synthesized TiO2 nanomaterial, as revealed by SEM and DLS analysis. Thermal behaviour of synthesized sample is characterized by TGA analysis. TiO2 photocatalyst is also characterized through XRD, BET surface area, and UV-Vis spectroscopy. TiO2 photocatalyst is used for degradation of three model pharmaceutical pollutants viz. Levofloxacin hemihydrate (LFX), Metronidazole (MNZ) and Ketorolac tromethamine (KRL) under a UV light source. Reverse micelle mediated modified sol-gel method synthesized TiO2 nanomaterial has shown excellent photocatalytical performance, where degradation efficiency of LFX, KRL and MNZ were found to be 99.6%, 98% and 91.4% respectively within a little as 60 minutes.

Synthesis of a novel visible light responsive γ-Fe2O3/SiO2/C-TiO2 magnetic nanocomposite for water treatment

2018 ◽  
Vol 78 (12) ◽  
pp. 2500-2510 ◽  
Author(s):  
Henry H. Mungondori ◽  
Spencer Ramujana ◽  
David M. Katwire ◽  
Raymond T. Taziwa
Keyword(s):  
Water Treatment ◽  
Visible Light ◽  
Surface Area ◽  
Fine Particles ◽  
Uv Light ◽  
Sol Gel ◽  
Spherical Shape ◽  
Solar Irradiation ◽  
Bet Surface Area ◽  
Average Pore

AbstractThis work investigates the preparation of a magnetically recoverable photocatalytic nanocomposite of maghemite nanoparticles coated with silica and carbon doped titanium dioxide. The novel nanocomposite boasts the advantages of efficient photocatalytic degradation of organic pollutants in water and ease of recovery of the fine particles after water treatment. The photocatalytic nanocomposite was successfully synthesized through a stepwise approach via co-precipitation and sol-gel methods. Characterisation by Fourier transform infrared (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) substantiated the existence of the intended structure of the nanocomposite and the particles were found to be in the size range of 15–22 nm with a quasi-spherical shape. Brunauer–Emmett–Teller (BET) surface area analysis revealed an average surface area of 55.20 m2/g, which is higher than that of commercial TiO2 (Degussa P25, 50.00 m2/g), and an average pore diameter of 8.36 nm. A 5 ppm methylene blue solution was degraded with an efficiency of 96.8% after 3 h of solar irradiation, which was 19.7% greater than using the same photo-catalyst under strict UV light irradiation. Photo-catalysis using these nanoparticles was observed to be very effective. The prepared novel visible light active nanocomposite has great potential for incorporation into water treatment systems because it exhibits good stability and magnetism, as well as high photocatalytic efficiency.

Magnetic field assisted photocatalytic degradation of organic dyes in the presence of Ag/TiO2 coated composite

2013 ◽  
Vol 67 (4) ◽  
pp. 722-728 ◽  
Author(s):  
Jian Wang ◽  
Jingqun Gao ◽  
Jun Wang ◽  
Yu Zhai ◽  
Zhongxing Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Rotational Speed ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Uv Light ◽  
Irradiation Time ◽  
Sol Gel ◽  
Heat Treated

Ag/TiO2 coated composite was prepared via sol-gel method in order to elucidate its application in magnetic field assisted photocatalytic degradation of dyes. Through the degradation of organic dyes, the key influences such as Ag amount, heat-treated temperature and time on the photocatalytic activity of Ag/TiO2, as well as UV irradiation time, rotational speed, dye concentration and magnetic sheet number on the photocatalytic degradation were studied. Results showed that the Ag/TiO2 with 25 wt% Ag content heat-treated at 550 °C for 60 min has the best photocatalytic activity. With the increase of UV light irradiation time, rotational speed and magnetic sheet number, the degradation rate is improved. Different dye degradation proved that the method could universally be used.

Analysis of Photo-Degradation of Dyed Veneer by XRD and SEM

2011 ◽  
Vol 306-307 ◽  
pp. 1609-1612
Author(s):  
Yi Liu ◽  
Jian Min Gao ◽  
Ling Min Shao ◽  
Hong Wu Guo
Keyword(s):  
Prolonged Exposure ◽  
Uv Light ◽  
Irradiation Time ◽  
Initial Period ◽  
Wood Fiber ◽  
Remarkable Change ◽  
Relative Crystallinity ◽  
Photo Degradation ◽  
Layer Spacing ◽  
Pit Membrane

The influence of ultraviolet radiation on photo-degradation of dyed veneer surfaces of Betulacostata Trautv has been examined in this study. Dyed veneer powder specimens were irradiated with a 45-watt UV light source and exposed 100 hours were analyzed and characterized for color, crystallization performance and microstructure changes by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that dyed veneer powder specimens took a remarkable change (photo-discoloration) in color with increasing irradiation time. The lattice structures of crystallite in wood cellulose were not destroyed by UV radiation, and the two theta angles and layer spacingdin crystallite were constant. The relative crystallinity of dyed wood presented an increase at initial period of exposure which decreases upon prolonged exposure, but the change was not apparent, no greater than 3%. Wood microstructure has exhibited obvious deterioration, pit membrane in wood cell walls as well as wood fiber surface stripping phenomena. Analysis of the crystal properties changes and SEM measured indicate that photo-degradation of dyed veneer is mainly due to dye stuffs in prophase and based on wood in anaphase.

Synthesis and Characterization of Hollow Anatase TiO2 Spheres and its Application in the Photodegradation of γ-Lindane under Ultraviolet Light

2014 ◽  
Vol 699 ◽  
pp. 245-250
Author(s):  
Afrouz Baharvand ◽  
Alias Mohd Yusof ◽  
Rusmidah Ali ◽  
Mohd Marsin Sanagi ◽  
Sheela Chandren ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Uv Light ◽  
Sol Gel ◽  
Hydrothermal Process ◽  
Hollow Spheres ◽  
Bet Surface Area ◽  
Tetrabutyl Titanate ◽  
Anatase Titania ◽  
Scanning Electron

Hollow anatase titania spheres have been synthesized using hydrothermally–prepared carbon spheres as the template. Here, the combination of hydrothermal process with sol–gel followed by calcination in air was done in order to obtain hollow anatase TiO2 spheres by utilizing fructose and tetrabutyl titanate (TBT) as the precursors. The structure and morphology of the products were characterized using various techniques, including Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermal gravimetric and differential thermal analysis (TG–DTA), scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). XRD showed that all peaks of TiO2 correspond to anatase crystalline phase. The BET surface area of the hollow spheres was about 22 m2g-1. The photocatalytic activity of the hollow anatase TiO2 was measured under UV light using γ-lindane as the target pollutant and was compared to commercially available TiO2.

Degradation of Alizarin Red Solution Using Nanometer TiO2 Film under UV Light Irradiation

2013 ◽  
Vol 643 ◽  
pp. 170-173 ◽  
Author(s):  
Peng Tian ◽  
Lu Sun ◽  
Gang Liu ◽  
Yan Hong Kang ◽  
Ji Dong Duan ◽  
...  
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Optimal Conditions ◽  
Solution Ph ◽  
Alizarin Red ◽  
Irradiation Intensity ◽  
Tio2 Particles ◽  
Photodegradation Efficiency ◽  
Uv Light Irradiation ◽  
Immobilized Tio2

This paper explores the sol-gel titanium dioxide the conditions of experiments to determine the best conditions. The photodegradation capability of alizarin red has been enhanced by using immobilized TiO2 particles, where the titanium sol synthesized by a sol-gel method was used as the binder for the immobilization. Optimal conditions of TiO2 film, alizarin red concentration, solution pH, and UV irradiation intensity have been found to enhance the photodegradation efficiency.

scholarly journals Influence of Solvents' Polarity on the Physicochemical Properties and Photocatalytic Activity of Titania Synthesized Using Deinbollia pinnata Leaves

2020 ◽  
Vol 8 ◽  
Author(s):  
Yakubu Rufai ◽  
Sheela Chandren ◽  
Norazah Basar
Keyword(s):  
Photocatalytic Activity ◽  
Ethyl Acetate ◽  
Uv Light ◽  
Anatase Phase ◽  
Spherical Shape ◽  
Average Crystallite Size ◽  
Titanium Isopropoxide ◽  
Bet Surface Area ◽  
X Ray ◽  
Vis Spectroscopy

Nanotechnology is one of the most interesting areas of research due to its flexibility to improve or form new products from nanoparticles (NPs), and as a fast, greener, more eco-friendly and sustainable solution to technological and environmental challenges. Among metal oxides of photocatalytic performance, the use of titania (TiO2) as photocatalyst is most popular due to its unique optical and electronic properties. Despite the wide utilization, the synthesis of TiO2 NPs bears many disadvantages: it utilizes various less environmental-friendly chemicals, high cost, requires high pressure and energy, and potentially hazardous physical and chemical methods. Hence, the development of green synthesis approach with eco-friendly natural products can be used to overcome these adverse effects. In this work, TiO2 NPs have been prepared by using Deinbollia pinnata leaves extracts, obtained by different solvents (n-hexane, ethyl acetate, and ethanol) with different polarities. The extracts acted as the reducing agent, while titanium isopropoxide as the precursor and water as the solvent. X-ray diffraction (XRD) pattern confirmed the synthesized TiO2 consist of anatase phase in high purity, with average crystallite size in the range of 19–21 nm. Characterization by using field emission scanning electron microscopy (FESEM) showed the TiO2 NPs possess a uniform semi-spherical shape in the size range of 33–48 nm. The energy dispersive X-ray (EDX) spectra of green TiO2 NPs showed two peaks for the main elements of Ti (61 Wt.%) and O (35 Wt.%). The band-gap energy of 3.2 eV was determined using UV-Vis spectroscopy. From the nitrogen sorption analysis, type V isotherm of the material was obtained, with BET surface area of 31.77 m2/g. The photocatalytic activity of synthesized TiO2 was evaluated for photodegradation of methyl orange (MO) under UV light irradiation. Based on the results, it is shown that TiO2 NPs synthesized with D. pinnata leaves extracted using ethyl acetate showed the most effective photodegradation performance, achieving 98.7% of MO conversion within 150 min. It can be concluded that the use of plant extracts in synthesis with TiO2 managed to produce highly crystalline anatase TiO2 with superior photocatalytic activity in the photodegradation of organic dye.

Preparation and Characterization of Fe3+-Doped TiO2/Diatomite Composite

2012 ◽  
Vol 268-270 ◽  
pp. 15-18 ◽  
Author(s):  
Lu Sun ◽  
Jun Xiong Lin ◽  
Lan Wang ◽  
Kai Xin Song
Keyword(s):  
Absorption Edge ◽  
Light Absorption ◽  
Sol Gel ◽  
Titanium Isopropoxide ◽  
Optimum Concentration ◽  
Bet Surface Area ◽  
Composite Catalyst ◽  
Composite Photocatalyst ◽  
Precursor Material

Fe3+-doped TiO2/diatomite composite photocatalyst were prepared by sol-gel method with titanium isopropoxide used as precursor material. The samples were characterized by SEM, XRD, XPS, BET surface area analysis and UV-Vis techniques. The results showed that the optimum concentration of Fe3+ in the composite catalyst was 0.2wt% when the quantity of TiO2 loaded on the diatomite was 30.3wt%. Compared with the un-doped photocatalyst, the Fe3+-doped sample exhibited red shifts of absorption edge and significant enhancement of light absorption at 400～600 nm.

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