Sorption of steroidal hormones by electrodialysis membranes
نویسندگان
چکیده
14 The mechanisms of sorption of four steroidal hormones – estradiol, estrone, progesterone and 15 testosterone – to electrodialysis (ED) membranes were investigated as a function of solution pH 16 and presence of humic acid (HA). Hormone-membrane partition coefficients (log KAEM/CEM) 17 determined through sorption isotherm experiments suggested that hormone sorption was due to 18 hydrogen bonding and cation–π interactions between hormone and membrane functional groups. 19 Progesterone sorption at pH 7 (922 μg/cm 3 ) during ED was greater than estrone sorption (591 20 μg/cm 3 ) due to its greater cation-exchange membrane (CEM) bonding affinity. Estrone sorption at 21 pH 11 (487 μg/cm 3 ) was reduced due to estrone dissociation and electrostatic repulsion with 22
منابع مشابه
Sorption of pesticide endosulfan by electrodialysis membranes
Endosulfan (ES) is a micropollutant found in reverse osmosis concentrates from water reuse applications. Electrodialysis (ED) can remove and recover charged solutes from such concentrates. While polar compounds cannot normally be removed, their fate in ED is important as they can contribute to membrane fouling/poisoning and be released during cleaning. High adsorption of ES to ED membranes was ...
متن کاملDemineralization of Cheese Whey by Sequential Nanofltration (NF) and Electrodialysis (ED) Processes
In this study, demineralization of cheese whey by sequential nanofltration (NF) and electrodialysis (ED) methods was investigated. For the NF step, two NF membranes labeled as NF-270 and NF-90 were tested. Approximately 90% of protein and lactose rejections were obtained with partial demineralization during NF step. For full demineralization of the NF permeate, NF follo...
متن کاملA mathematical model of multicomponent mass transfer in electrodialysis
A mathematical model has been developed which describes the mass transfer across monovalent-ionpermselective membranes as used in an electrodialysis cell. The mass transfer model is based on the StefanMaxwell transport equations. The latters are derived in the membrane phase with two unstirred layers on each side. Donnan equilibrium is used to describe the concentration and the potential discon...
متن کاملReverse Electrodialysis for Salinity Gradient Power Generation: Challenges and Future Perspectives
Salinity gradient energy, which is also known as Blue energy, is a renewable energy form that can be extracted from the mixing of two solutions with different salinities. About 80% of the current global electricity demand could potentially be covered by this energy source. Among several energy extraction technologie...
متن کاملElectrodialysis Heterogeneous Anion Exchange Membranes Filled with TiO2 Nanoparticles: Membranes' Fabrication and Characterization
In the current research, polyvinylchloride based mixed matrix heterogeneous anion exchange membranes were prepared by a solution casting technique. Titanium dioxide nanoparticles were also utilized as inorganic filler additive in the membrane fabrication. The effect of TiO2 nanoparticles concentration in the casting solution on the membrane physico-chemical properties was studied. Membrane wate...
متن کامل