ORCID Profile
0000-0002-0048-8849
Current Organisation
Tianjin University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Springer Science and Business Media LLC
Date: 19-11-2022
DOI: 10.1038/S41467-022-34849-7
Abstract: Covalent organic frameworks (COF), with rigid, highly ordered and tunable structures, can actively manipulate the synergy of entropic selectivity and enthalpic selectivity, holding great potential as next-generation membrane materials for ion separations. Here, we demonstrated the efficient separation of monovalent cations by COF membrane. The channels of COF membrane are decorated with three different kinds of acid groups. A concept of confined cascade separation was proposed to elucidate the separation process. The channels of COF membrane comprised two kinds of domains, acid-domains and acid-free-domains. The acid-domains serve as confined stages, rendering high selectivity, while the acid-free-domains preserve the pristine channel size, rendering high permeation flux. A set of descriptors of stage properties were designed to elucidate their effect on selective ion transport behavior. The resulting COF membrane acquired high ion separation performances, with an actual selectivity of 4.2–4.7 for K + /Li + binary mixtures and an ideal selectivity of ~13.7 for K + /Li + .
Publisher: Wiley
Date: 06-03-2023
Abstract: Side‐chain engineering of covalent organic frameworks as advanced ion conductors is a critical issue to be explored. Herein, ionic covalent organic framework membranes (iCOFMs) with spacer‐engineered ionic channel are de novo designed and prepared. The ionic channels are decorated with side chains comprising spacers having different carbon chain lengths and the –SO 3 H groups at the end. Attributed to the synergistic contribution from the spacers and the –SO 3 H groups, the iCOFM with moderate‐length spacer exhibit the highest through‐plane proton conductivity of 889 mS cm ‐1 at 90 °C.
Publisher: Springer Science and Business Media LLC
Date: 05-11-2022
DOI: 10.1038/S41467-022-33868-8
Abstract: The idea of spatial confinement has gained widespread interest in myriad applications. Especially, the confined short hydrogen-bond (SHB) network could afford an attractive opportunity to enable proton transfer in a nearly barrierless manner, but its practical implementation has been challenging. Herein, we report a SHB network confined on the surface of ionic covalent organic framework (COF) membranes decorated by densely and uniformly distributed hydrophilic ligands. Combined experimental and theoretical evidences have pointed to the confinement of water molecules allocated to each ligand, achieving the local enrichment of hydronium ions and the concomitant formation of SHBs in water-hydronium domains. These overlapped water-hydronium domains create an interconnected SHB network, which yields an unprecedented ultrahigh proton conductivity of 1389 mS cm −1 at 90 °C, 100% relative humidity.
Publisher: American Chemical Society (ACS)
Date: 30-06-2022
Abstract: Controllable ion transport through nanochannels is crucial for biological and artificial membrane systems. Covalent organic frameworks (COFs) with regular and tunable nanochannels are emerging as an ideal material platform to develop synthetic membranes for ion transport. However, ion exclusion by COF membranes remains challenging because most COF materials have large-sized nanochannels leading to nonselective transport of small ions. Here we develop ionic COF membranes (iCOFMs) to control ion transport through charged framework nanochannels, the interior surfaces of which are covered with arrayed sulfonate groups to render superior charge density. The overlap of an electrical double layer in charged nanochannels blocks the entry of co-ions, narrows their passageways, and concomitantly restrains the permeation of counterions
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7TA09082J
Abstract: It is of critical importance to design and fabricate highly active and stable catalysts for CO 2 conversion.
Publisher: Springer Science and Business Media LLC
Date: 28-11-2022
DOI: 10.1038/S41467-022-35105-8
Abstract: Engineering surface chemistry to precisely control interfacial interactions is crucial for fabricating superior antifouling coatings and separation membranes. Here, we present a hydrophobic chain engineering strategy to regulate membrane surface at a molecular scale. Hydrophilic phytic acid and hydrophobic perfluorocarboxylic acids are sequentially assembled on a graphene oxide membrane to form an hiphilic surface. The surface energy is reduced by the introduction of the perfluoroalkyl chains while the surface hydration can be tuned by changing the hydrophobic chain length, thus synergistically optimizing both fouling-resistance and fouling-release properties. It is found that the surface hydration capacity changes nonlinearly as the perfluoroalkyl chain length increases from C 4 to C 10 , reaching the highest at C 6 as a result of the more uniform water orientation as demonstrated by molecular dynamics simulations. The as-prepared membrane exhibits superior antifouling efficacy (flux decline ratio %, flux recovery ratio ~100%) even at high permeance (~620 L m −2 h −1 bar −1 ) for oil-water separation.
Publisher: Springer Science and Business Media LLC
Date: 07-04-2022
No related grants have been discovered for Zhongyi Jiang.