The present study aims to evaluate the application of coumarin as a green carrier alternative for dyeing of polyester fabrics, as well as to optimize key dyeing parameters in order to obtain greater color strength (K/S) at lower temperatures than 130°C using single azo class dispersed dye. For this purpose, a full-factorial design was used to study the influence of the single and interactive effects of four factors involved in the dyeing process, namely, pH, temperature, and coumarin and dye concentrations. The chosen technique was a 24-factorial, one-center point, and three replicates at the center point resulting on a response surface, which has shown an increase of the color strength of five times at 90°C, and of three times at 100°C when compared to dyeing at the same temperatures without the use of a carrier. In addition, excellent fastness to washing and to rubbing were obtained.
In this work, the antimicrobial treatment of raw sewage effluents (RSE) of residences was studied. For this, the RSE was collected from a treatment plant and the antimicrobial activity was evaluated using Ag 0 decorated ZnO nanoparticles.ZnO/Ag 0 nanoparticles were synthesized by a microwave-assisted hydrothermal method and sonochemical method. The effect of ZnO/Ag 0 nanoparticles was evaluated by varying the concentration of the catalyst to the RSE, varying the amount of silver, and varying the contact time of the catalyst with the RSE, to optimize the process. The ZnO/Ag 0 nanoparticles were characterized by X-ray diffraction, surface area using the Brunauer-Emmett-Teller methodology, and field emission scanning electron microscopy. The results indicate that the particles synthesized by the association of sonochemical and hydrothermal methods provide a better antimicrobial result against all tested bacteria.The results obtained in this manuscript indicate an alternative methodology in the removal of 99% of the bacteria from tailings from a real sewer, showing its applicability in the treatment for later consumption.
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