Nanofiltration (NF) is one of the most promising separation technologies of this century. It plays a major role in the chemical, medical, food, and other fields. The separation and permeation performance of NF membranes is closely related to microstructure. In this study, aqueous phase amine monomers are pre-crosslinked during the preparation of NF membranes. Trimesic acid (TMA) is used as a cross-linking agent with polyethyleneimine (PEI), whereby the resulting aqueous-phase monomer is interfacially polymerized with the organic-phase monomer to form a separation layer with internal lithium-ion permeation channels. The physicochemical structure of nanofiltration membranes is analyzed in detail. The pre-crosslinking process is optimized and the NF membrane performance can achieve 97% rejection of MgCl 2 , 15% rejection of LiCl, and 34 L m −2 h −1 permeate flux. The resulting NF membranes also show stable desalination performance in tests with mixed salt solutions. This study provides a new nanofiltration membrane structure and performance optimization scheme, which is favorable for magnesium-lithium separation systems.
A series of Fe(III)-based coordination-driven metallogel (MOG) electrolytes are obtained by absorbing liquid electrolytes with MOGs and applied to quasi-solid-state dye-sensitized solar cells (DSSCs). The MOG, prepared by Fe 3+ and trimesic acid, presents a porous and flower-like structure, which can ensure the effective diffusion of I − /I 3 − ions and excellent infiltration to the TiO 2 photoanode. Moreover, the mechanical property of MOG is stable enough to guarantee the photovoltaic performances of DSSCs in the operating environment. In the MOG electrolyte, trimesic acid acts as the gelator to coordinate with Fe 3+ to form MOG. Furthermore, the condition of TiO 2 conduction band edge of quasi-solid-state DSSC shifts with the liquid electrolyte concentration increasing in MOG, which results in both V oc and J sc increasing firstly and then decreasing, and the process of electron kinetics is investigated to illustrate these differences. Finally, an excellent photoelectric conversion efficiency of 5.31% is obtained for MOG electrolyte–based quasi-solid-state DSSC.
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