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RISS 인기검색어
- 검색키워드
- 저자 : Claudimir A. Carminatti (검색결과 2 건)
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Ricardo Brandes,Elizabeth C. A. Trindade,Daniel F. Vanin,Vanessa M. M. Vargas,Claudimir A. Carminatti,Hazim A. Al-Qureshi,Derce O. S. Recouvreux 한국섬유공학회 2018 Fibers and polymers Vol.19 No.9
Contaminants are often found in aquatic environments, for instance, heavy metals, dyes, parasites, pesticides, hormones and pharmaceuticals. Therefore, large amounts of these contaminants reaches wastewater via industrial and domestic effluents, causing major concern to human health. Heterogeneous photocatalysis is a technique for removing these contaminants in order to achieve better efficiency in water treatment. Then, bacterial cellulose (BC) produced in an agitated culture can form spherical bodies composed of nanofibers with high specific surface area. Moreover, Titanium dioxide (TiO2) is a semiconductor containing high photocatalytic activity capacity. Thus, the main objective in this work was to produce spherical BC/TiO2 nanocomposites for contaminants removal from wastewater by photocatalysis process. The incorporation of TiO2 nanoparticles in the spherical BC matrix was performed by ex situ and in situ methods. In addition, Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA) were used as tools of morphological, chemical and thermal characterizations of the nanocomposites. Besides, photocatalysis tests were performed in order to evaluate the removal efficiency of methylene blue from aqueous solutions. The results of these tests exhibited a percentage of methylene blue removal of 70.83 and 89.58 % after 35 minutes for spherical BC/TiO2 nanocomposites both, in situ and ex situ, respectively. Therefore, these results demonstrated that BC/TiO2 to be a low cost material with high capacity of contaminants removing and a great potential for industrial applications.
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Influence of the Processing Parameters on the Characteristics of Spherical Bacterial Cellulose
Ricardo Brandes,Letícia de Souza,Daniel V. F. Vanin,Claudimir A. Carminatti,Eliana M. Oliveira,Regina V. Antônio,Derce O. S. Recouvreux 한국섬유공학회 2018 Fibers and polymers Vol.19 No.2
Bacterial Cellulose (BC) biosynthesized under agitated conditions can produce hydrogels with spherical shapes and the processing parameters govern this formation of BC hydrogels. The variations of these parameters cause different results in the formation of spherical BC and it is relevant to evaluate these effects. Carbon source, inoculum concentration, volume of the culture medium, stirring speed and incubation temperature were the processing parameters evaluated in this work. Therefore, the results obtained were characterized in terms of dry mass production, water uptake and sphericity of the spherical BC. To do so, Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were employed as tools for morphological and chemical evaluations. Among the parameters analyzed, the carbon source had the greatest effect on the production of dry mass and water uptake. Glycerol had the greatest growing rate, generating a higher dry mass production with spherical and homogeneous bodies with excellent water absorption indexes. Furthermore, the morphological analysis of BC revealed a typical structure, with high crystallinity index and the presence of typical functional groups. These results indicate a path for the optimized and controlled production of spherical BC, allowing it to be used in many applications, such as enzyme immobilization, water treatment, bone regeneration, spherical cancer model, as adsorption agent and drug delivery.
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