Enhancement of surface charge in polyelectrolyte multilayer modified membranes
Ahmad, Nafees (2020)
Diplomityö
2020
School of Engineering Science, Kemiantekniikka
Kaikki oikeudet pidätetään.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2020112592950
https://urn.fi/URN:NBN:fi-fe2020112592950
Tiivistelmä
The aim of this master’s thesis was to enhance the surface charge of membrane with nanofiltration membrane properties by polyelectrolyte deposition which can be used further research projects in future.
In literature part of thesis, importance of filtration, polyelectrolytes and layer-by-layer technology are discussed. Additionally, cross-linking is also explained with Glutaraldehyde and ultraviolet methods for cationic and anionic polyelectrolytes crosslinking.
The experimental part of thesis is focused on evaluation of charges obtained by different polyelectrolyte, background salt concentrations and salt solution concentrations on permeability and surface charge of ultrafiltration (UF) UP020P membrane. Poly(diallyldimethylammonium chloride) PDADMAC is used as cationic and Poly(Sodium 4-styrenesulfonate) (PSS) is used as anionic polyelectrolyte and highest surface charge of -58.23 mV is obtained in this research.
Successful results of high permeability and surface charge are obtained on UP020P membrane getting 19.4 L.m-2h-1bar-1 and -53.81 mV respectively during pH 7.8 to 3.9. Polyelectrolyte deposition has been successfully adhered to membrane by Glutaraldehyde and Ultraviolet cross-linking by depositing 4.0 bilayers with PDADMAC and PSS polyelectrolytes and cross-linking with both 7.5 mM Glutaraldehyde and UV crosslinking for 3 hours.
In literature part of thesis, importance of filtration, polyelectrolytes and layer-by-layer technology are discussed. Additionally, cross-linking is also explained with Glutaraldehyde and ultraviolet methods for cationic and anionic polyelectrolytes crosslinking.
The experimental part of thesis is focused on evaluation of charges obtained by different polyelectrolyte, background salt concentrations and salt solution concentrations on permeability and surface charge of ultrafiltration (UF) UP020P membrane. Poly(diallyldimethylammonium chloride) PDADMAC is used as cationic and Poly(Sodium 4-styrenesulfonate) (PSS) is used as anionic polyelectrolyte and highest surface charge of -58.23 mV is obtained in this research.
Successful results of high permeability and surface charge are obtained on UP020P membrane getting 19.4 L.m-2h-1bar-1 and -53.81 mV respectively during pH 7.8 to 3.9. Polyelectrolyte deposition has been successfully adhered to membrane by Glutaraldehyde and Ultraviolet cross-linking by depositing 4.0 bilayers with PDADMAC and PSS polyelectrolytes and cross-linking with both 7.5 mM Glutaraldehyde and UV crosslinking for 3 hours.