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Zeweldi, Hana G.,Limjuco, Lawrence A.,Bendoy, Anelyn P.,Kim, Han-Seung,Park, Myoung Jun,Shon, Ho Kyong,Johnson, Eldin M.,Lee, Hanki,Chung, Wook-Jin,Nisola, Grace M. Elsevier 2018 Desalination Vol.444 No.-
<P><B>Abstract</B></P> <P>The widespread implementation of forward osmosis (FO) is highly constrained by the limited availability of suitable draw solutes (DS). Herein, monocationic hydrophilic ionic liquids (ILs) were probed as FO DS. Water (<I>J</I> <SUB> <I>v</I> </SUB>), reverse solute (<I>J</I> <SUB> <I>s</I> </SUB>), and specific reverse solute (<I>J</I> <SUB> <I>s</I> </SUB>/<I>J</I> <SUB> <I>v</I> </SUB>) fluxes were determined and correlated with IL properties: Van't Hoff factor (<I>i</I>), ionic strength, hydrated ionic radius (<I>r</I> <SUB> <I>H</I> </SUB>), diffusivity and membrane affinity. Most of the ILs have comparable <I>J</I> <SUB> <I>v</I> </SUB> with the benchmark draw solute NaCl but their <I>J</I> <SUB> <I>s</I> </SUB> were significantly lower, particularly under PRO mode. Their remarkably lower <I>J</I> <SUB> <I>s</I> </SUB>/<I>J</I> <SUB> <I>v</I> </SUB> (i.e. <0.010 ± 7.45 × 10<SUP>−4</SUP> mol L<SUP>−1</SUP>) than NaCl (0.021 ± 0.003 mol L<SUP>−1</SUP>) validates their potential use as FO DS. Tetraethylammonium bromide ([N2222]Br) is the most suitable IL DS due to its high <I>π</I>, high ionic strength, small <I>r</I> <SUB> <I>H</I> </SUB>, least membrane permeability (<I>B</I> = 0.14 L m<SUP>−2</SUP> h<SUP>−1</SUP>) and lowest <I>J</I> <SUB> <I>s</I> </SUB>/<I>J</I> <SUB> <I>v</I> </SUB> = 0.004 ± 5.53 × 10<SUP>−4</SUP> mol L<SUP>−1</SUP>. Moreover, [N2222]Br effectively desalinated seawater (0.6 M NaCl). It is thermally stable and can be effectively regenerated through direct contact membrane distillation. The final permeated water had only trace [N2222]Br, which is safe for consumption as confirmed by <I>in vitro</I> toxicity tests. These results demonstrate that certain ILs like [N2222]Br can be identified as suitable draw solutes for FO desalination process.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ionic liquids (ILs) were effectively employed as draw solutes for forward osmosis (FO). </LI> <LI> IL dissociation in water, conductivity and molecular size was important for <I>J</I> <SUB> <I>v</I> </SUB>. </LI> <LI> Hydrated radii and membrane sorption properties of ILs were critical to <I>J</I> <SUB> <I>s</I> </SUB>. </LI> <LI> All ILs especially [N2222]Br performed better than NaCl in terms of <I>J</I> <SUB> <I>s</I> </SUB>/<I>J</I> <SUB> <I>v</I> </SUB>. </LI> <LI> [N2222]Br is regenerable, has low toxicity, and has high potential as FO draw solute. </LI> </UL> </P>
단일 양이온성 이미다졸륨, 포스포늄 및 암모늄 등을 기반으로 하는 친수성 이온성액체의 정삼투용 유도용질로서의 가능성
Hana Gebreegziabher Zeweldi,Lawrence A. Limjuco,Anelyn P. Bendoy,김한승,박명준,손호경,정욱진,Grace M. Nisola 한국막학회 2018 한국막학회 총회 및 학술발표회 Vol.2018 No.11
Forward osmosis (FO) has emerged as one of the most promising technologies for seawater desalination. Despite the progress in membrane technology, draw solutions are still limited in terms of its reusability thereby hampering its economic viability. Hydrophilic ILs can be easily dissolved in water to constitute a DS. ILs are environmentally benign due to their high thermal stability and negligible vapor pressure. Hydrophilic ILs can be easily dissolved in water to constitute a DS. ILs are environmentally benign due to their high thermal stability and negligible vapor pressure. This work was supported by NRF funded by the Korea government funded by the Ministry of Science and ICT (2016R1A2B1009221 and 2017R1A2B2002109) and Ministry of Education (2009-0093816 and 22A20130012051(BK21Plus)).
Thermo-Responsive Supramolecular Host-Guest Complex Systems As Draw Solutes In Forward Osmosis
Hana Gebreegziabher Zeweldi(쯔웰디 하나 게브리지아보),Grace Nisola(그레이스 니솔라),Wook-Jin Chung(정욱진),Anelyn P. Bendoy(벤도이 아닐린),Myongjun Park(박명준),Ho-Kyung Shon(손호경),Han-Seung Kim(김한승),Hern Kim(김헌) 대한환경공학회 2021 대한환경공학회 학술발표논문집 Vol.2021 No.11