Chemical Recycling
Mostrando 13-24 de 96 artigos, teses e dissertações.
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13. Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction
The final destination of PET packaging is creating economic and environmental concerns. One of the alternatives to minimize this problem would be making use of chemical recycling of this material through glycolysis with the aim to produce bis(hydroxiethyl) terephthalate, BHET monomer. This reaction is well known, but it still presents problems as BHET purity
Mat. Res.. Publicado em: 06/11/2017
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14. Reprocessability of PHB in extrusion: ATR-FTIR, tensile tests and thermal studies
Abstract Mechanical recycling of biodegradable plastics has to be encouraged, since the consumption of energy and raw materials can be reduced towards a sustainable development in plastics materials. In this study, the evolution of thermal and mechanical properties, as well as structural changes of poly(hydroxybutyrate) (PHB) up to three extrusion cycles wer
Polímeros. Publicado em: 29/06/2017
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15. Recycling and Mechanical Characterization of Polymer Blends Present in Printers
More and more electronic devices are being produced and most of them are disposed of improperly. In addition, as they contain heavy metals and toxic substances in their composition, the environmental impact increases. This work aims to study the recycling of polymers present in e-waste through the mechanical characterization of polymer blends produced with t
Mat. Res.. Publicado em: 22/06/2017
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16. A EDUCAÇÃO AMBIENTAL NA FORMAÇÃO DE PROFESSORES DE QUÍMICA: ESTUDO DIAGNÓSTICO E REPRESENTAÇÕES SOCIAIS
This study aimed to investigate environmental education (EE) in the initial training of teachers of chemistry. The data were based on documentary analysis of the political pedagogical project of the Chemical Education course, the syllabus of school subjects, questionnaires and interviews with students. The resulting diagnosis explicitly shows little evidence
Quím. Nova. Publicado em: 2016-07
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17. High shear dispersion of tracers in polyolefins for improving their detection
Abstract An efficient recycling of end-of-life products is of crucial interest from an economical and ecological point of view. However, the near infrared spectroscopy often used for the optic sorting processes is limited because of the absorption of carbon black present in black plastics and as it only sorts as a function of chemical formulas. The tracing t
Polímeros. Publicado em: 2015-10
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18. Use of calcined layered double hydroxides for the removal of color and organic matter from textile effluents: kinetic, equilibrium and recycling studies
This paper presents data for the synthesis and characterization of layer double hydroxides (LDH) and their use for color and chemical oxygen demand (COD) removal from effluents generated by a textile industry. Adsorption studies with raw and biologically treated (activated sludge) textile effluent showed that the pseudo-second order model best fitted the exp
Braz. J. Chem. Eng.. Publicado em: 2014-03
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19. Using different catalysts in the chemical recycling of waste from flexible polyurethane foams
Due to their versatility, polyurethane (PU) foams have many different applications, such as sponges, filling materials in furniture, automotive seats and clothes, among others. It is also one of the main refrigerator components serving as a heat insulating material. As PUs find different application niches, they must be largely produced and, consequently, lo
Polímeros. Publicado em: 25/10/2013
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20. Mechanical characterization of sisal fiber-reinforced recycled HDPE composites
The increasing awareness of the environment protection has contributed to concerns regarding alternative procedures for recycling of plastic wastes. Since chemical processes are high cost, energy and often environment harmful, thermo-mechanical techniques of recycling rises as a good alternative. This research deals with mechanical characterization of thermo
Mat. Res.. Publicado em: 02/08/2013
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21. Aproveitamento das fraÃÃes hemicelulÃsica e celulÃsica dos resÃduos do processamento do girassol para produÃÃo de bioetanol / Utilization of hemicellulosic and cellulosic fractions of waste from sunflower processing for bioethanol production
The researches on second generation ethanol, produced by agroindustrial wastes, have demanded special attention as a possible solution that can contribute to energy sustainability. Such production is based on lignocellulosic fiber conversion (cellulose and hemicellulose), which generates fermentable sugars that are biotransformed in bioethanol after some spe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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22. Potential of biogas and methane production from anaerobic digestion of poultry slaughterhouse effluent
The objective of this study was to evaluate the efficiency of anaerobic digestion on the treatment of effluent from poultry slaughterhouse. The experiment was conducted at the Laboratory of Waste Recycling from Animal Production/FCA/UFGD. During four weeks, eight experimental digesters, semi-continuous models, were loaded and set according to the hydraulic r
R. Bras. Zootec.. Publicado em: 2012-11
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23. Reciclagem do lixo de informática: uma oportunidade para a química
Recycling and sustainable development are increasing in importance around the world. In Brazil, the new National Policy on Solid Wastes has prompted discussion on the future of electronic waste (e-waste). Brazil generates the greatest amount of e-waste among Latin American countries. Nevertheless complete recycling, including end processing of e-waste, does
Química Nova. Publicado em: 2012
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24. Processamento de cartuchos de impressoras de jato de tinta: um exemplo de gestão de produto pós-consumo
This work presents a route for processing spent ink-jet cartridges in an experimental course. The disassembly of the cartridges requires several steps and the recognition of their different components is essential to define the best final destination (recycling, co-processing). The plastic strips were chemically processed so as to recover gold and copper. Th
Química Nova. Publicado em: 2012