Showing results for: UV/VIS Articles
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UV-VIS Spectrophotometer
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UV-VIS Spectrophotometer
UV-VIS Spectrophotometer UV-5200PC UV Spectrophotometer UV-5100 UV Spectrophotometer UV-5100B UV Spectrophotometer UV-5500PC UV Spectrophotometer UV-5600PC UV Spectrophotometer UV-5800PC UV Spectrophotometer UV-6000PC UV Spectrophotometer N5000 UV-VIS Color Spectrophotometer U2000 UV VIS Spectrophotometer U3200 UV VIS Spectrophotometer UV1100 UV Spectrophotometer UV1700 UV Spectrophotometer ...
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Removal of methylene blue from water by γ-MnO2
Methylene blue (MB) is a cationic dyestuff, which is particularly resistant to biodegradation. The molecular sieved γ-MnO2 was used as an adsorbent/oxidant to remove the MB at room temperature and in visible light. The removal efficiency was mainly evaluated by X-ray diffractometer (XRD), UV–Vis spectrometer (UV–Vis), total organic carbon (TOC). The results revealed that the mechanisms of MB ...
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Photocatalytic degradation of methyl orange, methylene blue and rhodamine B with AgCl nanocatalyst synthesised from its bulk material in the ionic liquid [P6 6 6 14]Cl
The photocatalytic degradation of wastewater containing three industrial dyes belonging to different families, methyl orange (MO), methylene blue (MB) and Rhodamine B (RhB), was studied under UV-Vis irradiation using synthesised silver chloride nanoparticles. The nanocatalyst was prepared by a dissolution/reprecipitation method starting from the bulk powder and the ionic liquid ...
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Heterogeneous photocatalytic degradation of 4-nitrophenol by visible light responsive TiO2-polyaniline nanocomposites
Different compositions of TiO2-polyaniline composites were prepared via chemical oxidative polymerisation of aniline over TiO2 nanoparticles followed by hydrothermal treatment. The prepared composites were characterised by various physicochemical techniques. From UV-VIS digital replay system (DRS) analysis, the shifts of the absorption maximum towards the visible region are indicated and ...
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Sonocatalytic degradation of organic dyes and influence of Al2O3, Y2O3 and Fe2O3 on catalytic activity of TiO2 under ultrasonic irradiation
In order to improve the sonocatalytic activity of TiO2, Al2O3/TiO2, Y2O3/TiO2 and Fe2O3/TiO2 composites were prepared using mechanical mixing, liquid boiling, ultrasonic dispersion and heat-treated methods. And then, a series of degradation experiments were carried out under ultrasonic irradiation. Also, the influences of heat-treated temperature and heat-treated time on the sonocatalytic ...
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Water and environmental analysis according to US EPA regulations using the lambda 25/35/45 UV/Vis spectrophotometers
UV/Vis spectroscopy is an important analytical technique used for the determination of many water constituents. Environmental regulations in many countries prescribe the use of UV/Vis spectroscopy. Depending on the method, UV/Vis determinations of metal and organic nonmetal analytes in water have a minimum detectability in the ppb-ppm range. The Lambda UV/Vis Spectrophotometers The Lambda 25 as ...
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Effect of different pH coking wastewater on adsorption of coking coal
H2SO4 has an effect on the sorption of organic contaminants by coking coal (CC) in wastewater. This paper focused on the effect of pH on the removal of chemical oxygen demand (COD), phenols and ammonia. UV-vis spectra, Fourier transform infrared spectra, zeta potential and Brunauer, Emmett and Teller (BET) analysis were investigated to characterize the changes of CC properties and coking ...
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Forecasting of UV-Vis absorbance time series using artificial neural networks combined with principal component analysis
This work proposes a methodology for the forecasting of online water quality data provided by UV-Vis spectrometry. Therefore, a combination of principal component analysis (PCA) to reduce the dimensionality of a data set and artificial neural networks (ANNs) for forecasting purposes was used. The results obtained were compared with those obtained by using discrete Fourier transform (DFT). The ...
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Ecotoxicity of multiwalled carbon nanotubes: Standardization of the dispersion methods and concentration measurements
There is currently a variety of applications for multiwalled carbon nanotubes (MWCNTs), but considerable concerns exist regarding their release into the environment. Their potential accumulation by aquatic organisms could lead to a transfer throughout food chains. Considering the divergences in experimental data published on ecotoxicity of carbon nanotubes, further research is required. The ...
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Quantification of polymer concentration in water using UV-Vis spectroscopy
The goal of this study was to develop a method that uses UV-Vis spectroscopy for the determination of residual polymer concentration water and environmental samples. UV-Vis absorbance measurements are quick and simple and can be usefully applied in research and practice. Five different polymers exhibiting a wide range of polymer characteristics were tested in the UV range of 200–300 nm. ...
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Study on synthesis and photocatalytic activity of novel visible light sensitive photocatalyst Ag
3PO4Silver orthophosphate nanoparticles have been synthesised by precipitation of AgNO3 and H3PO4 in presence of oleylamine and other solvents like toluene, and ethanol at room temperature. Particle sizes of silver orthophosphate nanocrystals can be controlled by adjusting the amount of water. The products were characterised by XRD, UV–Vis, FESEM and EDX. The characterisation results showed that the ...
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Analysis of a complex produced in the Fenton oxidation process
The absorbances of different concentrations of Fe2+, Fe3+ and H2O2 were investigated by UV-visible spectrophotometry without separating the substances. The law of complex formation was studied by considering changes in the UV-vis spectra of mixtures of these three substances. The results show that upon eliminating the influence of the substrate, an iron-based complex was present ...
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Room temperature, water-based, microreactor synthesis of gold and silver nanoparticles
Synthesis of gold and silver nanoparticles at room temperature using a polydimethylsiloxane (PDMS) microreactor has been reported. The reactions have been performed using aqueous metal salt solutions and borohydride reducing agent with tri-sodium citrate as the capping agent. Effect of concentration of reducing agent on the optical properties of the nanoparticles has been investigated. The ...
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Identification of industrial wastewater by clustering wastewater treatment plant influent ultraviolet visible spectra
A procedure is proposed which allows the detection of industrial discharge events at the inlet of a wastewater treatment plant without the need for measurements performed at the industry, for special equipment and for exact knowledge of the industrial sewage. By performing UV/Vis measurements at the inlet of a plant and analyzing them with a two-staged clustering method consisting of the ...
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Construction of adsorptive nanorods from polyoxometalates and ionic liquid and their adsorption properties for silver ion from AMD
A new structure of hybrid nanorods adsorbent ([n-BBIM]9PW9O34) was synthesized by a simple molecular assembly of polyoxometalates with ionic liquids (ILs). The nanocomposite was characterized by Fourier transform infrared (FT-IR), ultraviolet-visible (UV-Vis), scanning electron microscope, energy dispersive X-ray and X-ray diffractometer. Adsorption of silver from acid mine drainage (AMD) was ...
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Separation of colors and scents from candle wax
Separation and detection and additives from scented candles While electric lighting has have largely replaced candles as a light source, they are still popular for decorative purposes. Originally from bees’ wax, modern candles are typically made from paraffin or stearin. Often, coloring and scents are added to candles. These additives can be separated from the candle wax by chromatography. ...
By BUCHI
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Kinetic studies on the degradation of crystal violet by the Fenton oxidation process
The degradation of dye crystal violet (CV) by Fenton oxidation process was investigated. The UV–Vis spectrogram has shown that CV can be degraded effectively by Fenton oxidation process. Different system variables namely initial H2O2 concentration, initial Fe2 + concentration and reaction temperature, which have effect on the degradation of CV by Fenton oxidation process, have been studied ...
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Application Fields and Main Functions of Spectrophotometer
UV Vis spectrophotometer is widely used in pharmaceutical, medical and health, chemical industry, energy, machinery, metallurgy, environmental protection, geology, food, biology, materials, agriculture, forestry, fishery and many other industries, in higher education, metrology science and research institutes. It plays an important role in the fields of teaching, scientific research, quality ...
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High temperature microwave-assisted synthesis and the physico-chemical characterisation of mesoporous crystalline titania
Mesoporous TiO2 with nanocrystalline architecture has been synthesised by using microwave-assisted high temperature method using polymeric surfactant. The polymeric template was removed by stepwise carbonisation process. The structural order, band structure and the textural parameters of the calcined mesoporous titania were investigated by using numerous sophisticated techniques such as XRD, ...
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