Removal of benzalkonium chloride by polymeric adsorbent
Sustainable process-product development & green chemistry
Sustainable & Clean Technologies-I: Extraction & Remediation (T1-4P)
Keywords: cationic surfactant, adsorption, polymer
Removal of benzalkonium chloride by polymeric adsorbent
IRINA TURKU*, TUOMO SAINIO, and ERKKI PAATERO. Irina.Turku@lut.fi, Tuomo.Sainio@lut.fi, Erkki.Paatero@lut.fi
Cationic surfactants are widely used in many industries, household products, and hospitals as bactericides. Because of their toxic properties and very large production volume, their efficient removal from wastewaters is very important.
In the resent years, polymeric resins were widely investigated as an alternative to activated carbon for the removal of organic pollutants from wastewater because of their uniform surface chemistry and determined pore structure as well as possibility of regeneration under mild conditions. In this work, adsorption of cationic surfactants onto non-ionic polymeric resins is investigated by using benzalkonium chloride (BKC) as a model substance. Two types of adsorbents are used: XAD-7 is acrylic ester polymer, whereas XAD-16 is styrenic crosslinked polymer. Adsorption equilibrium was investigated at different ionic strengths (0.1, 10 and 100 mM NaCl) and different temperatures (23 oC, 37 oC and 50 oC). Kinetic experiments were conducted in a batch adsorber at pH 5, an ionic strength of 0.1 mM NaCl, and a temperature of 23 oC.
The adsorption equilibrium isotherms were successfully correlated with the Langmuir isotherm. Thermodynamic parameters for the adsorption process were determined using adsorption equilibrium parameters calculated for different temperatures. Apparent intraparticle diffusion coefficients were estimated from batch adsorption kinetics data by using a Fickian diffusion model.
Removal of BKC with a single-column chromatographic process was also investigated experimentally and by means of mathematical modeling. As expected from the batch adsorption kinetics data, mass transfer resistances were found to be significant.
Key Words: cationic surfactant, adsorption, polymer
See the full pdf manuscript of the abstract.
Presented Monday 17, 13:30 to 15:00, in session Sustainable & Clean technologies - I: Extraction-Remediation (T1-4P).
