membrane

Cellulose Acetate Hollow Fiber Membranes from Banana Stem Fibers Coated by TiO2 for Degradation of Waste Textile Dye

Cellulose acetate hollow fiber membrane from banana stem fibers coated by TiO2 (CAHFMT) was prepared and characterized as an alternative material for degradation of waste textile dye. Its applicability was demonstrated by mechanical properties, FTIR, SEM, thermal resistance, performance, and degradation efficiency. Cellulose acetate (CA) was synthesized from banana stem fibers by swelling stage, acetylation reaction, and hydrolysis reaction. CA was modified using TiO2 of various concentrations.

Chemical, Spectral and Morphological Characterization of Humic Acids Extracted and Membrane Purified from Lignite

In this study, humic substances were extracted from lignite of Zarand coalfields, Kerman, Iran, using a stirred batch reactor. A membrane ultrafiltration system was used to purify humic acids (HAs) from lignite-derived alkaline extracts obtained from the reactor. Gravimetric analysis along with several analytical methods including CHNOS, UV-Vis, FT-IR, ICP-OES and SEM were utilized to investigate the characteristics of the purified HAs. Gravimetric analysis showed that the purity of HA purified from membrane concentrated humates was higher than 95 %.

Tnt-based sulfonated polynaphthylimides useful as proton exchange membranes for fuel cells (pemfcs)

PEMFC Fuel Cell uses a polymer membrane as an electrolyte. It is used in all applications with dynamic loads, especially in mobile applications but also as combined heat and power units in households. The development of the membranes ion-conductivity has much increased over the last 30 years. Today “Nafion”-based membranes achieve a power density up to 1 W/cm² active area. In the last 10 years the successful adoption of the PEMFC in different prototypes could be demonstrated. For a market-introduction a few “teething problem” like life-time and costs have to be solved.

Structure Controlled Formation and Properties of Highly Hydrophilic Membranes Based on Polyvinylpyrrolidone Copolymers

Polymerization of hydroxyalkyl(meth)acrylates with polyvinylpyrrolidone has been investigated. Thus highly hydrophilic membranes have been obtained and several properties have been investigated including polymerization rate, viscosity, extinction, water permeability of the membranes, their tensile strength and tensile elongation at break. Parameters characterizing complex formation between monomer and polyvinylpyrrolidone are related to structural parameters of resulting copolymer networks.

Dehydration Pervaporation of Ethyl Acetate-Water Mixture via Sago/PVA Composite Membranes Using Surface Methodology

In the present study hydrophilic sago/polyvinyl alcohol (PVA) blend membranes were used for pervaporation of ethyl acetate-water mixture. The effects of feed concentration, temperature and permeate pressure on the separation factor and permeation flux were studied by using response surface methodology (RSM). The central composite design (CCD) was used to design the experiment and analyze pervaporation performance of homogenous sago/PVA membranes and also to obtain process optimum conditions.

Application of Glutaraldehyde-Crosslinked Chitosan Membranes from Shrimp Shellwaste on Production of Biodiesel from Calophyllum Inophyllum Oil

The purification of biodiesel was performed using glutaraldehyde-crosslinked chitosan membrane to improve the quality and to reduce the cost of biodiesel production. Biodiesel was obtained by acid-based catalyzed transesterification of Calophyllum inophyllum oil. The results of this experiment showed that the amount of glycerol in biodiesel before the process is 0.3014±0.05 %. After the purification process performed for 1 h, the glycerol content in biodiesel has been reduced to 0.1429±0.09 %.