Production and characterization of membranes of recycled waste materials: Cellulose acetate,obtained from sugarcane bagasse with polystyrene from plastics cups |
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| Authors: | Carla da Silva Meireles Guimes Rodrigues Filho Rosana Maria Nascimento de Assunção Daniel Alves Cerqueira Mara Zeni Kátia Mello Suellen Lorenzi |
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| Affiliation: | 1. Instituto de Química da Universidade Federal de Uberlandia, Av. Jo?o Naves de ávila 2121, CEP 38400‐902, Cx. P. 593, Uberlandia‐Minas Gerais, Brasil;2. Departamento de Física e Química da Universidade de Caxias do Sul‐Caxias do Sul, Rio Grande do Sul, Brasil |
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| Abstract: | Membranes of cellulose acetate from sugarcane bagasse (CA), as well as blends of this cellulose acetate and polystyrene from plastic cups (CA/PS) were produced by casting utilizing dichloromethane as solvent at the concentration 12% w/w. The membranes were characterized regarding ion diffusion by dialysis and properties of pure water permeation rate, PEG rejection (utilizing an aqueous solution 1% w/v of polyethylene glycol (PEG), 45 and 80 kDa). Thermal characterization by thermogravimetric analysis and differential scanning calorimetry were also performed. The morphology of the membranes' cross‐sections was evaluated by scanning electron microscopy. The experiment of ion diffusion by dialysis showed that the ion diffusion coefficient of CA membrane is comparable to that found in the literature for membranes of commercial cellulose triacetate, 8.47 × 10?8 cm2 s?1, while the ion diffusion coefficient of blends decreased as PS was added to the system. Regarding transport driven by pressure, CA membrane presented low rejection of PEG 80 kDa. These results showed that CA membrane could be used in a range of application comprehending the process of ultrafiltration or microfiltration. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers. |
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