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RISS 인기검색어
- 검색키워드
- 저자 : Daniella R. Mulinari (검색결과 2 건)
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Polyurethane Foam Reinforced with Fibers Pineaplle Crown Biocomposites for Sorption of Vegetable Oil
Isabella Loureiro Muller Costa,Francisco Maciel Monticeli,Daniella R. Mulinari 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8
The concern in reducing the environmental impacts caused by human interference is increasing. Thus, theobjective of this study was to generate a sustainable solution for sorption of vegetable oil. It was developed and characterizedbiocomposites obtained from polyurethane derived from castor oil reinforced with fibers from the crown of pineapple forsorption of vegetable oil. The biocomposites were obtained by mass mixing the polyol with the prepolymer (1:1) andreinforced with 5 to 20 % (wt/wt) pineapple crown fiber in 18 and 35 mesh granulometry. The biocomposites and purepolyurethane were characterized by scanning electron microscopy (SEM), optical microscopy (OM), X-ray Diffraction(XRD), porosimetry, contact angle, and density. Sorption tests were carried out on the biocomposites and pure polyurethane(PU). The sorption capacity of the biocomposites was evaluated as a function of the fiber content inserted in the matrix. Results of the sorption tests showed that the biocomposites reinforced with fibers of 18 mesh (20 % wt) presentedapproximately twice the sorption capacity when compared to pure PU and others biocomposites results, due to high porositycombined with high surface area, which influenced directly in the oil sorption. Response surface methodology (RSM)tecnique confirmed the influence fibers granulometry and content on oil sorption.
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Maia Lana S.,Duizit Letícia D.,Pinhatio Fernanda R.,Mulinari Daniella R. 한국탄소학회 2021 Carbon Letters Vol.31 No.4
The discharge of dye-containing industrial efuents such as methylene blue (MB) in water bodies has resulted in severe aquatic and human life problems. In addition to this factor, there is the accumulation of banana peel wastes, which can generate ecological damage. Thus, this research purpose a diferent method from the literature using the banana peel waste (BP) to produce activated carbon (ACBP) by NaOH activation followed by pyrolysis at 400 °C to remove methylene blue (MB). The material was characterized by TGA, XRD, SEM, BET, and FTIR. The infuence of dye concentration (10, 25, 50, 100, 250, and 500 mg L−1) was investigated. ACBP presented a well-developed pore structure with a predominance of mesopores and macropores. This morphological structure directly infuences the MB removal capacity. The highest efciency for dye removal was in the MB initial concentration of 25 mg L−1, sorbent of 0.03 g, and contact time of 60 min, which were 99.8%. The adsorption isotherms were well defned by Langmuir, Freundlich, and Temkin isotherm models. The Langmuir model represented the best ft of experimental data for ACBP with a maximum adsorption capacity of 232.5 mg g−1. This adsorbent showed a comparatively high performance to some previous works. So, the banana peel waste is an efcient resource for producing activated carbon and the adsorption of methylene blue.
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