Sökning: "anion exchange"
Visar resultat 16 - 20 av 45 uppsatser innehållade orden anion exchange.
16. Poly(p-terphenyl piperidinium) as anion exchange membranes. Synthesis and evaluation of properties
Master-uppsats, Lunds universitet/Centrum för analys och syntesSammanfattning : Alkaline exchange membrane fuel cells (AEMFC) is an interesting and attractive alternative to proton exchange membrane fuel cells (PEMFC) due to the potential use of non-precious catalysts which can reduce the overall cost of the fuel cell. An important component of the AEMFC is the anion conducting membrane. LÄS MER
17. Comparison of Corn and Rye Arabinoxylans for the Production of Bio-based Materials
Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)Sammanfattning : Enzymes and subcritical water can be used for the extraction of hemicelluloses from cereal by-products, making the processes eco-friendly. The polysaccharides extracted from cereal by-products can be used as matrices for development of materials for various applications. LÄS MER
18. Arsenite removal from contaminated water by different sorbent materials
Master-uppsats, KTH/Hållbar utveckling, miljövetenskap och teknikSammanfattning : Arsenic (As) contamination is a worldwide problem, and millions of people are suffering from it. There are two major inorganic forms of As in waters: arsenate(V) and arsenite(III), and adsorption to a sorbent material may be an efficient method to handle them. LÄS MER
19. Method development for the analysis of PFAS and neutral precursors in active and passive air samplers
Master-uppsats, Örebro universitet/Institutionen för naturvetenskap och teknikSammanfattning : Poly- and perfluoroalkyl substances (PFAS) are a chemical class of global concern because of their persistence, toxicity and widespread presence in the environment. This work aimed to develop a robust and reliable method to analyse perfluorohexane sulfonic acid (PFHxS), perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS), as well as the neutral volatile PFOS precursors, namely perfluorooctane sulfonamides and perfluorooctane sulfonamidoethanols (FOSAs/FOSEs). LÄS MER
20. Trace level analyses of selected perfluoroalkyl substancesin food: Method development and validation
Master-uppsats, Örebro universitet/Institutionen för naturvetenskap och teknikSammanfattning : To comprise the future requirements to detect low levels of perfluoroalkane acids, includingbranched and linear perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid (PFOA),and perfluorohexane sulfonic acid (PFHxS) in food items, here analytical methods fordetermination of PFOS, PFOA and PFHxS in six different food matrices (cow milk, butter,chicken egg, chicken meat, beef, and fish) were optimized and validated. The optimizedmethod was based on alkaline digestion and solid-liquid extraction using acetonitrile,followed by solid phase extraction (SPE) using a weak anion exchange cartridge as clean-up. LÄS MER