Pervaporation Membranes Based on Polyelectrolyte Complex of Sodium Alginate/Polyethyleneimine Modified with Graphene Oxide for Ethanol Dehydration
Author:
Dmitrenko Mariia1ORCID, Mikhailovskaya Olga1, Dubovenko Roman1ORCID, Kuzminova Anna1ORCID, Myznikov Danila1ORCID, Mazur Anton1, Semenov Konstantin2ORCID, Rusalev Yury3, Soldatov Alexander3, Ermakov Sergey1, Penkova Anastasia1ORCID
Affiliation:
1. St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia 2. Pavlov First Saint Petersburg State Medical University, L’va Tolstogo ulitsa 6–8, St. Petersburg 197022, Russia 3. The Smart Materials Research Institute, Southern Federal University, 178/24 Sladkova St., Rostov-on-Don 344090, Russia
Abstract
Pervaporation is considered the most promising technology for dehydration of bioalcohols, attracting increasing attention as a renewable energy source. In this regard, the development of stable and effective membranes is required. In this study, highly efficient membranes for the enhanced pervaporation dehydration of ethanol were developed by modification of sodium alginate (SA) with a polyethylenimine (PEI) forming polyelectrolyte complex (PEC) and graphene oxide (GO). The effect of modifications with GO or/and PEI on the structure, physicochemical, and transport characteristics of dense membranes was studied. The formation of a PEC by ionic cross-linking and its interaction with GO led to changes in membrane structure, confirmed by spectroscopic and microscopic methods. The physicochemical properties of membranes were investigated by a thermogravimetric analysis, a differential scanning calorimetry, and measurements of contact angles. The theoretical consideration using computational methods showed favorable hydrogen bonding interactions between GO, PEI, and water, which caused improved membrane performance. To increase permeability, supported membranes without treatment and cross-linked were developed by the deposition of a thin dense layer from the optimal PEC/GO (2.5%) composite onto a developed porous substrate from polyacrylonitrile. The cross-linked supported membrane demonstrated more than two times increased permeation flux, higher selectivity (above 99.7 wt.% water in the permeate) and stability for separating diluted mixtures compared to the dense pristine SA membrane.
Funder
Russian Science Foundation Saint-Petersburg State University
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