Edible colors are materials which in the case of adding to food and drinks cause transferring color to them. Most of these colors are not acceptable in terms of applying in human food and underlies various diseases like gastrointestinal disorders, renal, liver an More
Edible colors are materials which in the case of adding to food and drinks cause transferring color to them. Most of these colors are not acceptable in terms of applying in human food and underlies various diseases like gastrointestinal disorders, renal, liver and blood toxicity. The goal of this study was investigating the efficiency of improved alumina by sodium dodecyl sulfate (SDS) in eliminating Tartrazine from aqueous environments. In this research, the impact of effective parameters such as initial concentration of Tartrazine, time, pH, alumina dose and SDS value were studied in order to approach an optimal condition for eliminating the color. Also, absorption behavior was evaluated by Freundlich and Langmuir isotherms. The highest efficiency of Tartrazine elimination in the solution resulted in optimal pH of 2, the amount of adsorbent 1.5 g/L, 16 min duration and value 0.04 SDS g/l which was obtained for dye concentration 5 mg/L about 94.13%. Also, results suggested that Tartrazine absorption follows Langmuir isotherm (R2 = 0.9867). Obtained results from thermodynamic studies such as Gibbs free energy (-5.728 Kj/mol) and enthalpy (-85.86 Kj/mol) and entropy (-271.102 J/mol.K) also suggested that the absorption process was exothermic. The results of this research suggested that improved alumina by sodium dodecyl sulfate had a relative good capability in Tartrazine elimination from aqueous environments. Thus
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Sodium dodecyl sulfate (SDS) is one of the strong alkaline sulfates germicidal which is used in health and beauty purposes. In this study, the effect of minimum bactericidal concentration of SDS on 4 major foodborne pathogens including Escherichia coli, Salmonella typhi More
Sodium dodecyl sulfate (SDS) is one of the strong alkaline sulfates germicidal which is used in health and beauty purposes. In this study, the effect of minimum bactericidal concentration of SDS on 4 major foodborne pathogens including Escherichia coli, Salmonella typhimurium, Staphylococcus aureus and Listeria monocytogenes in normal saline was studied. Different concentration of SDS was made and based on standard methods the level of MIC and MBC for all strains was measured. Then the least bactericidal concentration of SDS on viability of strains in 4 and 25°C in different time's periods was studied. MIC and MBC results showed that E. coli and S. typhimurium have a similar sensitivity to SDS; meanwhile L. monocytogenes is so sensitive to SDS among the studied strains. The rate of viability of the strains is much higher in cold condition than in ambient temperature. SDS has an effective role in reducing the population of studied bacteria in different temperatures and time. Raising the temperature increases the antibacterial effect of the SDS. Also Listeria monocytogenes is very more sensitive to SDS in comparison to other studied bacteria. So according to the results of the study, sodium dodecyl sulfate could be useful for reducing population of pathogenic bacteria especially Listeria monocytogenes on surfaces, foodstuffs and equipment.
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In this study, a core–shell TiO2 coated magnetic mesoporous nanocomposite (Fe3O4@MCM@TiO2) was synthesized and modified with an anionic surfactant for the removal of a cationic dye, (methylene blue) from well and wastewater samples. Fe3O4 was loaded on mesopore (M More
In this study, a core–shell TiO2 coated magnetic mesoporous nanocomposite (Fe3O4@MCM@TiO2) was synthesized and modified with an anionic surfactant for the removal of a cationic dye, (methylene blue) from well and wastewater samples. Fe3O4 was loaded on mesopore (MCM-41) and coated with TiO2 as a nano platelet shell. An anionic surfactant, sodium dodecyl sulfate (SDS), was used to modify the adsorbent through hemimicelles/admicelles process and also to prevent the agglomeration of the adsorbent. The surface chemical characteristics and morphology of the prepared Fe3O4@MCM@TiO2were studied by the Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM), and Brunauer-Emmett-Teller (BET) analytical techniques. The effect of effective parameters for the removal of methylene blue was also studied. The adsorption data fitted with the Langmuir model showed a short equilibrium time with the maximum capacity uptake of 227.27 mg g-1. This method was successfully applied for removal of methylene blue in environmental water samples with an appropriate recovery in the range of 89.0 and 94.2%.
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