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Boron-selective membranes by surface functionalization with affinity hydrogel
The conventional reverse osmosis (RO) membranes in the one-pass RO configuration have limited competence to remove boron efficiently from seawater. They have only around 80 % of boron rejection, while the projected boron rejection should exceed 90 % in order to meet the requirements for using the water in irrigation. One promising approach is to diminish the boron concentration before the RO stage, which can be achieved in the RO pretreatment step. Upon this context, a membrane adsorber that integrated membrane-based separation with selective boron adsorption can be used in the pretreatment step for boron polishing. In this work, commercial ultrafiltration (UF) and microfiltration (MF) polyethersulfone (PES) membranes have been modified to integrate specific boron binding property. First, an active coating can be formed in the support layer of the UF membrane by infiltrating a reactive polymer and a cross-linker, and a subsequent post-functionalization endows the active coating with boron affinity. In the other alternative strategies, the commercial UF or MF membranes can be pre-modified by a tertiary amine containing layer via macromolecular adsorption or a two-step surface treatment. And the polymeric boron affinity coating can be constructed on such premodified surface via a graft-from approach or an integrated initiation system of combining graft-from and graft-through approaches. The modified membranes show specific boron binding and a trade-off between water permeability and boron binding capacity. Furthermore, the parameters that affect the final filtration performance and boron binding performance have been systematically studied. And the parameter optimization has been done to screen for the membrane adsorber with good potential for practical application. Finally, the cost estimation has been done to evaluate the feasibility of using the tailored membrane adsorber in the pretreatment step considering aspects of modification cost and regeneration cost. ; Die konventionellen Umkehrosmose (RO)-Membranen in ...
Boron-selective membranes by surface functionalization with affinity hydrogel
The conventional reverse osmosis (RO) membranes in the one-pass RO configuration have limited competence to remove boron efficiently from seawater. They have only around 80 % of boron rejection, while the projected boron rejection should exceed 90 % in order to meet the requirements for using the water in irrigation. One promising approach is to diminish the boron concentration before the RO stage, which can be achieved in the RO pretreatment step. Upon this context, a membrane adsorber that integrated membrane-based separation with selective boron adsorption can be used in the pretreatment step for boron polishing. In this work, commercial ultrafiltration (UF) and microfiltration (MF) polyethersulfone (PES) membranes have been modified to integrate specific boron binding property. First, an active coating can be formed in the support layer of the UF membrane by infiltrating a reactive polymer and a cross-linker, and a subsequent post-functionalization endows the active coating with boron affinity. In the other alternative strategies, the commercial UF or MF membranes can be pre-modified by a tertiary amine containing layer via macromolecular adsorption or a two-step surface treatment. And the polymeric boron affinity coating can be constructed on such premodified surface via a graft-from approach or an integrated initiation system of combining graft-from and graft-through approaches. The modified membranes show specific boron binding and a trade-off between water permeability and boron binding capacity. Furthermore, the parameters that affect the final filtration performance and boron binding performance have been systematically studied. And the parameter optimization has been done to screen for the membrane adsorber with good potential for practical application. Finally, the cost estimation has been done to evaluate the feasibility of using the tailored membrane adsorber in the pretreatment step considering aspects of modification cost and regeneration cost. ; Die konventionellen Umkehrosmose (RO)-Membranen in ...
Boron-selective membranes by surface functionalization with affinity hydrogel
Ke, Qirong (author) / Ulbricht, Mathias
2021-11-25
Theses
Electronic Resource
English
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