Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Ultrafiltration Membranes Functionalized with Polydopamine with Enhanced Contaminant Removal by Adsorption
AU - Capozzi, Luigi C.
AU - Mehmood, Farrukh M.
AU - Giagnorio, Mattia
AU - Tiraferri, Alberto
AU - Cerruti, Marta
AU - Sangermano, Marco
PY - 2017/5/12
Y1 - 2017/5/12
N2 - The performance of polymeric ultrafiltration membranes functionalized with polydopamine to couple depth adsorption of contaminants with the typical surface rejection characteristics of the membrane is investigated. Two approaches are deployed to achieve this functionalization: in a two-step method, the ultrafiltration membranes are initially fabricated by phase inversion, then followed by coating with polydopamine; in a more facile and advantageous one-step method, the membranes are subjected to phase inversion in a water solution containing dopamine, so that polymer precipitation and polydopamine functionalization occur at the same time. Methylene blue is used as the representative target contaminant to study the enhancement of membrane adsorption behavior, and its removal is investigated both in batch and under filtration conditions. The sorption capacity increases with increasing polydopamine coating time and is higher for the membranes fabricated via the one-step protocol. The amount of methylene blue adsorbed per unit of membrane mass is large (roughly 5–10 mg g−1) and the kinetics of adsorption is fast. These characteristics allow these materials to get operated effectively and for long times in membrane filtration processes before stopping the system for regeneration. The saturated membranes are completely regenerated and reused without loss of performance by cycling in acidic and alkaline solutions. (Figure presented.).
AB - The performance of polymeric ultrafiltration membranes functionalized with polydopamine to couple depth adsorption of contaminants with the typical surface rejection characteristics of the membrane is investigated. Two approaches are deployed to achieve this functionalization: in a two-step method, the ultrafiltration membranes are initially fabricated by phase inversion, then followed by coating with polydopamine; in a more facile and advantageous one-step method, the membranes are subjected to phase inversion in a water solution containing dopamine, so that polymer precipitation and polydopamine functionalization occur at the same time. Methylene blue is used as the representative target contaminant to study the enhancement of membrane adsorption behavior, and its removal is investigated both in batch and under filtration conditions. The sorption capacity increases with increasing polydopamine coating time and is higher for the membranes fabricated via the one-step protocol. The amount of methylene blue adsorbed per unit of membrane mass is large (roughly 5–10 mg g−1) and the kinetics of adsorption is fast. These characteristics allow these materials to get operated effectively and for long times in membrane filtration processes before stopping the system for regeneration. The saturated membranes are completely regenerated and reused without loss of performance by cycling in acidic and alkaline solutions. (Figure presented.).
KW - adsorption
KW - polydopamine
KW - polysulfone membrane
KW - ultrafiltration
U2 - 10.1002/mame.201600481
DO - 10.1002/mame.201600481
M3 - Journal article
AN - SCOPUS:85013187237
VL - 302
JO - Macromolecular Materials and Engineering
JF - Macromolecular Materials and Engineering
SN - 1438-7492
IS - 5
M1 - 1600481
ER -