Thin film nanocomposite membranes containing metal-organic cages for desalination
A nanocomposite and thin film technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems that cannot be easily enlarged and complicated
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Embodiment 1
[0153] Example 1. Contains ZrT-1-NH 2 Preparation of Thin Film Nanocomposite (TFN) Membranes
[0154] Contains ZrT-1-NH 2 The thin film nanocomposite (TFN) membrane was prepared by interfacial polymerization of a polyamide membrane on a polyethersulfone (PES) substrate ( figure 2 ). Considering ZrT-1-NH 2Low solubility in pure water, a mixed solvent comprising acetone and water (3:2 v / v) was used for membrane fabrication.
[0155] In a typical procedure, the PES ultrafiltration membrane (100) is exposed to 2 (0.01, 0.02 and 0.04 w / v% respectively; as prepared by General Procedure 1; 90) in 1 mL of 2 wt% m-phenylenediamine (MPD; 85) in acetone / water (3:2 v / v) for 2min. Excess MPD solution remaining on the PES substrate was removed through filter paper. After drying in air for 1 min, the PES substrate was immersed in (105) 1 mL of 0.15 w / v% 1,3,5-trimesoyl chloride (TMC; 75) in n-hexane for 1 min to induce polymerization via interfacial polymerization (120 ) to form a p...
Embodiment 2
[0160] Example 2. Permeability of membranes prepared as in Example 1
[0161] The permeation properties of the TFN and TFC membranes prepared as in Example 1 were tested in a desalination test using NaCl solution (2000 ppm).
[0162] program
[0163] The permeability of the membrane was measured using a nanofiltration cell. The stirring speed was kept constant at 350 rpm to minimize concentration polarization during the filtration process. The effective area of the membrane is 19.6cm 2 , and the penetration test was performed at 25 °C and 15.5 bar. Prior to permeation testing, each membrane was first compacted with the feed solution at 15.5 bar for 20 min to obtain a stable flux.
[0164] result
[0165] Addition of ZrT-1-NH to polyamide selective layer 2 Increased both water flux and salt rejection ( Figure 4 ). After adding 0.04% ZrT-1-NH 2 After that, the water flux increased by 250%. NaCl rejection also increased from 91% (TFC) to 95% (0.04-TFN). The enhanced...
Embodiment 3
[0166] Example 3. Contains ZrT-1-NH 2 Optimal preparation and characterization of thin-film nanocomposite (TFN) membranes
[0167] TFN membranes were prepared by interfacial polymerization on commercially available polysulfone (PSF) substrates (Foglia, F. et al., Adv. Funct. Mater. 2017, 27(37), 1701738).
[0168] In a typical procedure, PSF substrates were exposed to 1 mL of 1,3-phenylenediamine (MPD) containing 2 wt% and various amounts of ZrT-1-NH 2 (prepared as in General Procedure 1) in acetone / water solution (v / v = 3:2) for 2 min, then filter paper to remove excess solution. The PSF substrate was then fixed on the frame (such that interfacial polymerization occurred only on its top surface), and 1 mL of 0.15% (w / v) 1,3,5-trimesoyl chloride (TMC) in n-hexane was introduced solution for interfacial polymerization. After reacting for 1 min, the resulting membrane was washed with n-hexane to remove residues on the membrane surface, followed by sufficient washing with deio...
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