The Experts below are selected from a list of 1026 Experts worldwide ranked by ideXlab platform
Edson Luiz Foletto - One of the best experts on this subject based on the ideXlab platform.
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Preparation of polyethylene–supported zero–valent iron buoyant catalyst and its performance for Ponceau 4R decolorization by photo–Fenton process
Journal of environmental chemical engineering, 2019Co-Authors: Anelise Mossmann, Sérgio Luiz Jahn, Guilherme Luiz Dotto, Dachamir Hotza, Edson Luiz FolettoAbstract:Abstract In this work, zero–valent iron powders were supported onto polyethylene pellet using thermal attachment method at low temperature (120 °C). Polyethylene–supported zero–valent iron was used as a photo–Fenton buoyant catalyst for the removal of Ponceau 4R dye from aqueous solution under visible light. The material was characterized by X–ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X–ray spectroscopy (EDS), Fourier–transform infrared spectroscopy (FTIR) and photographic images. Through the results, excellent adherence of zero–valent iron powders onto the polyethylene pellet surface was obtained. The material showed satisfactory catalytic activity, reaching total decolorization of Ponceau 4R dye at 15 min of reaction. In addition, the buoyant catalyst exhibited other advantages such as easy separation from aqueous solution, good stability and recyclability. Therefore, this research exhibited the great potential of polyethylene–supported zero–valent iron as a photo–Fenton buoyant catalyst to apply in environmental remediation.
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preparation of polyethylene supported zero valent iron buoyant catalyst and its performance for Ponceau 4R decolorization by photo fenton process
Journal of environmental chemical engineering, 2019Co-Authors: Anelise Mossmann, Sérgio Luiz Jahn, Guilherme Luiz Dotto, Dachamir Hotza, Edson Luiz FolettoAbstract:Abstract In this work, zero–valent iron powders were supported onto polyethylene pellet using thermal attachment method at low temperature (120 °C). Polyethylene–supported zero–valent iron was used as a photo–Fenton buoyant catalyst for the removal of Ponceau 4R dye from aqueous solution under visible light. The material was characterized by X–ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X–ray spectroscopy (EDS), Fourier–transform infrared spectroscopy (FTIR) and photographic images. Through the results, excellent adherence of zero–valent iron powders onto the polyethylene pellet surface was obtained. The material showed satisfactory catalytic activity, reaching total decolorization of Ponceau 4R dye at 15 min of reaction. In addition, the buoyant catalyst exhibited other advantages such as easy separation from aqueous solution, good stability and recyclability. Therefore, this research exhibited the great potential of polyethylene–supported zero–valent iron as a photo–Fenton buoyant catalyst to apply in environmental remediation.
Anelise Mossmann - One of the best experts on this subject based on the ideXlab platform.
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Preparation of polyethylene–supported zero–valent iron buoyant catalyst and its performance for Ponceau 4R decolorization by photo–Fenton process
Journal of environmental chemical engineering, 2019Co-Authors: Anelise Mossmann, Sérgio Luiz Jahn, Guilherme Luiz Dotto, Dachamir Hotza, Edson Luiz FolettoAbstract:Abstract In this work, zero–valent iron powders were supported onto polyethylene pellet using thermal attachment method at low temperature (120 °C). Polyethylene–supported zero–valent iron was used as a photo–Fenton buoyant catalyst for the removal of Ponceau 4R dye from aqueous solution under visible light. The material was characterized by X–ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X–ray spectroscopy (EDS), Fourier–transform infrared spectroscopy (FTIR) and photographic images. Through the results, excellent adherence of zero–valent iron powders onto the polyethylene pellet surface was obtained. The material showed satisfactory catalytic activity, reaching total decolorization of Ponceau 4R dye at 15 min of reaction. In addition, the buoyant catalyst exhibited other advantages such as easy separation from aqueous solution, good stability and recyclability. Therefore, this research exhibited the great potential of polyethylene–supported zero–valent iron as a photo–Fenton buoyant catalyst to apply in environmental remediation.
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preparation of polyethylene supported zero valent iron buoyant catalyst and its performance for Ponceau 4R decolorization by photo fenton process
Journal of environmental chemical engineering, 2019Co-Authors: Anelise Mossmann, Sérgio Luiz Jahn, Guilherme Luiz Dotto, Dachamir Hotza, Edson Luiz FolettoAbstract:Abstract In this work, zero–valent iron powders were supported onto polyethylene pellet using thermal attachment method at low temperature (120 °C). Polyethylene–supported zero–valent iron was used as a photo–Fenton buoyant catalyst for the removal of Ponceau 4R dye from aqueous solution under visible light. The material was characterized by X–ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X–ray spectroscopy (EDS), Fourier–transform infrared spectroscopy (FTIR) and photographic images. Through the results, excellent adherence of zero–valent iron powders onto the polyethylene pellet surface was obtained. The material showed satisfactory catalytic activity, reaching total decolorization of Ponceau 4R dye at 15 min of reaction. In addition, the buoyant catalyst exhibited other advantages such as easy separation from aqueous solution, good stability and recyclability. Therefore, this research exhibited the great potential of polyethylene–supported zero–valent iron as a photo–Fenton buoyant catalyst to apply in environmental remediation.
Ramiro Avidad - One of the best experts on this subject based on the ideXlab platform.
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simultaneous determination of the colorants tartrazine Ponceau 4R and sunset yellow fcf in foodstuffs by solid phase spectrophotometry using partial least squares multivariate calibration
Talanta, 1998Co-Authors: L F Capitanvallvey, Maria D Fernandez, Ignacio De Orbe, Ramiro AvidadAbstract:Abstract A method is proposed for the simultaneous determination of the colorants tartrazine (TT), sunset yellow FCF (SY) and Ponceau 4R (PR) in foods. The colorants were fixed in Sephadex DEAE A-25 gel at pH 2.0 and then packed in a 1-mm silica cell. The spectra of the analytes fixed in the solid support were recorded between 400 and 800 nm against a blank and the partial least squares (PLS) multivariate calibration was used to obtain the results. The linear dynamic ranges of the calibration graphs were from 50.0 to 650.0 ng ml−1 for the three colorants and these ranges were taking in account the optimisation of the calibration matrix using the PLS-1 algorithm. The experimental results showed that the optimum number of factors for the calibration matrix was four in all instances and the residual means standard deviation was 5.5267 for SY, 6.3878 for TT and 6.9816 for PR. The square of the correlation coefficients were 0.9977, 0.9978 and 0.9954 for SY, TT and PR respectively. The method was applied to the determination of the colorants in foods and results were compared with those obtained by means of HPLC as reference method. The results obtained can be considered as acceptable in most cases (eight of nine commercial samples). The relative standard deviations ranging between 0.5 and 10.8 for the commercial samples analysed.
Suna Toptan - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous determination of Indigotin and Ponceau-4R in food samples by using Vierordt's method, ratio spectra first order derivative and derivative UV spectrophotometry
Journal of Food Composition and Analysis, 2003Co-Authors: Sacide Altınöz, Suna ToptanAbstract:Abstract Three sensitive and accurate methods for determination of Indigotin and Ponceau-4R in mixtures by Vierordt's method, ratio spectra first order derivative and first order derivative UV spectrophotometry are described. No separation step was required for these novel methods. Ratio spectra first order derivative and first derivative UV spectrophotometric methods were studied in the wavelength range of 300–700 nm and phosphate buffer pH 7.0 medium. The linearity ranges were found as 1.00–50.00 μg ml −1 for Indigotin and 1.00–52.00 μg ml −1 for Ponceau-4R dyes at developed UV spectrophotometric methods. In order to determine both dyes these procedures were applied to the commercially available food samples containing saccharose and citric acid such as powdered drinks, sweets and jellies. Developed spectrophotometric methods were found accurate, precise, reproducible, directly and easily applicable for the analysis of Indigotin and Ponceau-4R in food samples. The data obtained from these spectrophotometric methods to determine Indigotin and Ponceau-4R dyes in food were compared with data from HPLC methods which have been previously reported. No statistically significant difference was found between these methods.
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Determination of Tartrazine and Ponceau-4R in Various Food Samples by Vierordt's Method and Ratio Spectra First-Order Derivative UV Spectrophotometry
Journal of Food Composition and Analysis, 2002Co-Authors: Sacide Altιnöz, Suna ToptanAbstract:Abstract Two spectrophotometric methods have been described for determining Tartrazine and Ponceau-4R in binary mixtures. These methods permit the simultaneous determination of these food colorants in various commercially available food samples which contain saccharose and citric acid. Ratio spectra first-order derivative UV spectrophotometric method was studied in the wavelength range 300–700 nm and phosphate buffer pH 7.0 medium. The linearity range was found to be 1.00–60.00 μg mL −1 for Tartrazine and 1.00–52.00 μg mL −1 for Ponceau-4R dyes by Vierordt's and ratio spectra first-order derivative UV spectrophotometric methods. The values obtained from developed methods and the high-performance liquid chromatographic (HPLC) method given in the literature were compared. It was found that the difference was not statistically important between these methods. It was concluded that developed Vierordt's and ratio spectra first-order derivative UV spectrophotometric methods were accurate, sensitive, precise, reproducible and could be applied easily and directly to the routine analysis of the food samples.
A. M. Contento Salcedo - One of the best experts on this subject based on the ideXlab platform.
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Resolution of ternary mixtures of Tartrazine, Sunset yellow and Ponceau 4R by derivative spectrophotometric ratio spectrum-zero crossing method in commercial foods
Talanta, 1998Co-Authors: J. J. Berzas Nevado, C. Guiberteau Cabanillas, J. Rodríguez Flores, M. J. Villaseñor Llerena, A. M. Contento SalcedoAbstract:Abstract A very simple spectrophotometric method is described for resolving ternary mixtures of the food colorants Tartrazine, Sunset Yellow and Ponceau 4R by using the first derivative of the ratio spectra with measurements at zero-crossing wavelengths. Calibration graphs are linear up to 20 mg l −1 of Tartrazine (E-102), 40 mg l −1 of Sunset Yellow (E-110) and 32 mg l −1 of Ponceau 4R (E-124). Standard deviations of 0.9, 0.8 and 2.4% were obtained for nine standards of 8 mg l −1 of Tartrazine, 8 mg l −1 of Sunset Yellow and 8 mg l −1 of Ponceau 4R, respectively. This method was satisfactorily used for determining synthetic mixtures of these colorants in different ratios (from 1:1:1 to 1:5:5 or even higher) with recoveries in 94–105% range and it was successfully applied over three commercial products containing the three dyes and it did not require any separation step. The results were compared with those obtained by HPLC and very similar values were found by both methods.
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Spectrophotometric resolution of ternary mixtures of amaranth, Carmoisine and Ponceau 4R by the derivative ratio spectrum-zero crossing method
Fresenius' Journal of Analytical Chemistry, 1994Co-Authors: J. J. Berzas Nevado, C. Guiberteau Cabanillas, A. M. Contento SalcedoAbstract:A method for the simultaneous determination of Amaranth, Ponceau 4R and Carmoisine dyes in ternary mixtures is proposed, with no separation step; this is based on the simultaneous use of the first derivative of ratio spectra and measurements at zero-crossing wavelengths. The calibration graphs are linear up to 32 mg/L of Amaranth, Carmoisine and Ponceau 4R. The mean recovery is 102.1, 95.3 and 102.6 %, respectively. The method was applied to several food products.
