Permeability enhancement of chemically modified and grafted polyamide layer of thin-film composite membranes for biogas upgrading

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F21%3A10248523" target="_blank" >RIV/61989100:27710/21:10248523 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985858:_____/22:00545892 RIV/60461373:22310/22:43925166 RIV/60461373:22340/22:43925166 RIV/44555601:13440/22:43896865

Výsledek na webu

<a href="http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=11&SID=C65KVLF8P55rkreshmM&page=1&doc=3" target="_blank" >http://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=GeneralSearch&qid=11&SID=C65KVLF8P55rkreshmM&page=1&doc=3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.memsci.2021.119890" target="_blank" >10.1016/j.memsci.2021.119890</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Permeability enhancement of chemically modified and grafted polyamide layer of thin-film composite membranes for biogas upgrading

Popis výsledku v původním jazyce

Membrane separations enable biogas upgrading, but their energy efficiency must still be improved for industrial upscaling. Nevertheless, UV treatment affects the permeation properties of the polyamide functional layer of reverse osmosis (RO) and nanofiltration thin film composite (TFC) membranes. In this work, after membrane activation via Piranha solution, cysteamine grafting and UV irradiation, we determined the gas permeability of dry and swelled samples. The samples exhibited higher permeability to gases (CO2, CH4 and N2) than pristine membranes, reaching a 100% increase in RO membranes grafted with cysteamine after UV activation. Permeability increased more than twofold compared to TFC RO membranes activated by diode discharge plasma, as recently reported. Separation favored smaller gas molecules, and the increase in permeability resulting from all modifications did not adversely affect selectivity. CO2/CH4 selectivity remained almost constant over the range of trans-membrane pressure difference to 400 kPa. The grafting with cysteamine to the activated functional layer at the RO membrane positively affected permeability despite the detrimental effect of activation with a Piranha solution. The same activation or cysteamine grafting method at the nanofiltration membrane led only to a very short operation time, although the pristine nanofiltration membrane was stable. The pristine nanofiltration membrane were less permeable to all gasses than all RO membranes. Mixed gas separation of model binary biogas mixtures enhanced CH4 and CO2 permeability only in membranes activated with UV radiation. Decrease of mixed gas selectivity with the growing feed pressure showed that the gas mixture is more effectively separated at lower trans-membrane pressures. Therefore, our model for describing gas mixture separations in cylindrical permeation cells can be utilized to better evaluate the mass transfer coefficient and assess the strength of the coupling effect. (C) 2021

Název v anglickém jazyce

Permeability enhancement of chemically modified and grafted polyamide layer of thin-film composite membranes for biogas upgrading

Popis výsledku anglicky

Membrane separations enable biogas upgrading, but their energy efficiency must still be improved for industrial upscaling. Nevertheless, UV treatment affects the permeation properties of the polyamide functional layer of reverse osmosis (RO) and nanofiltration thin film composite (TFC) membranes. In this work, after membrane activation via Piranha solution, cysteamine grafting and UV irradiation, we determined the gas permeability of dry and swelled samples. The samples exhibited higher permeability to gases (CO2, CH4 and N2) than pristine membranes, reaching a 100% increase in RO membranes grafted with cysteamine after UV activation. Permeability increased more than twofold compared to TFC RO membranes activated by diode discharge plasma, as recently reported. Separation favored smaller gas molecules, and the increase in permeability resulting from all modifications did not adversely affect selectivity. CO2/CH4 selectivity remained almost constant over the range of trans-membrane pressure difference to 400 kPa. The grafting with cysteamine to the activated functional layer at the RO membrane positively affected permeability despite the detrimental effect of activation with a Piranha solution. The same activation or cysteamine grafting method at the nanofiltration membrane led only to a very short operation time, although the pristine nanofiltration membrane was stable. The pristine nanofiltration membrane were less permeable to all gasses than all RO membranes. Mixed gas separation of model binary biogas mixtures enhanced CH4 and CO2 permeability only in membranes activated with UV radiation. Decrease of mixed gas selectivity with the growing feed pressure showed that the gas mixture is more effectively separated at lower trans-membrane pressures. Therefore, our model for describing gas mixture separations in cylindrical permeation cells can be utilized to better evaluate the mass transfer coefficient and assess the strength of the coupling effect. (C) 2021

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20400 - Chemical engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Membrane Science

ISSN

0376-7388

e-ISSN

—

Svazek periodika

641

Číslo periodika v rámci svazku

1 January 2022

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

1-11

Kód UT WoS článku

000705871700006

EID výsledku v databázi Scopus

2-s2.0-85115927971