Abstract CuCrO2 was synthesized by solution combustion synthesis (SCS) and applied as a heterogeneous catalyst to produce soybean biodiesel. The combustion reaction was carried out using urea as a fuel, and copper (II) and chromium (III) nitrates as precursors. After the powders’ obtention, these were calcined and functionalized in an acidic medium. The powders were characterized by thermogravimetry (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (IR) techniques. The TG curve revealed that the formation of the CuCrO2 in the combustion reaction remained stable up to 1000 °C. The XRD results confirmed the formation of the CuCrO2 compound. The SEM images showed that the crystallinity of the samples increased after the calcination process. The IR spectra showed the presence of delafossite characteristic bands. After the transesterification reaction, biodiesel was obtained with a yield of around 80%. Thus, catalysts based on delafossite synthesized through the combustion method and functionalized showed to be promising for the transesterification reaction of vegetable oils. CuCrO SCS (SCS fuel II (II III (III precursors obtention medium TG, , (TG) Xray X ray XRD, (XRD) SEM, (SEM) (IR techniques 100 C °C compound process bands 80 80% Thus oils (TG (XRD (SEM 10 8 1

Resumo Este trabalho visou a obtenção de filtros cerâmicos com ação bactericida para desinfecção de água. Para isto, suspensões aquosas de argila montmorilonita K10 foram preparadas nas concentrações de 48%, 50% e 52% e impregnadas em esponjas poliméricas para formação dos esqueletos cerâmicos por meio do método de réplica. Os filtros cerâmicos foram submersos nas resinas de níquel dopadas com 0,25 e 0,50 %mol de prata obtidas pelo método Pechini, e tratadas termicamente a 600 e 700 ºC por 2 h. Os filtros foram caracterizados por difração de raios X, análise de tamanho de partícula, microscopia eletrônica de varredura, espectroscopia por energia dispersiva, resistência à compressão, absorção de água, porosidade aparente e teste bactericida. Os resultados do teste bactericida mostraram que os filtros impregnados com a resina contendo 0,50 %mol de prata promoveu a eliminação total das bactérias Staphylococcus aureus e Escherichia coli.

Abstract This study aimed to obtain ceramic filters with bactericidal action for water disinfection. For this, aqueous suspensions of montmorillonite K10 clay were prepared at concentrations of 48%, 50%, and 52%. Later, these were impregnated into polymeric sponges in order to form the ceramic skeletons by using the replica technique. The ceramic filters were submerged in nickel resins doped with 0.25 and 0.50 mol% silver. These resins were obtained by the Pechini method and heat-treated at 600 and 700 ºC for 2 h. Moreover, techniques such as X-ray diffraction, particle size analysis, scanning electron microscopy, energy dispersive spectroscopy, compressive strength, water absorption, and apparent porosity were used to characterize the filters, and their performance was analyzed by a bactericidal test. The bactericidal test results showed that the filters impregnated with the resin containing 0.50 mol% of silver promoted the total elimination of the Staphylococcus aureus and Escherichia coli bacteria.