Method for improving preparation of Zr-based MOF (Metal Organic Framework) membrane by using intermediate modification layer and forward osmosis application of Zr-based MOF membrane
An intermediate layer, forward osmosis membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low water flux, high reverse salt flux, and poor membrane compactness. Achieve the effects of high hydrophilicity, high mechanical strength and suitable specific surface area
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Embodiment 1
[0065] 1. Preparation of mullite carrier:
[0066] Mullite green body was prepared by wet spinning-phase inversion method using fly ash and bauxite as raw materials. First, 16 g of PES and 2 g of PVP additives were dissolved in 64 g of NMP, and ball milled for 6 h to completely dissolve to prepare a polymer slurry. Then 46 g of fly ash and 54 g of bauxite were added to the polymer solution, and the ball milling was continued for more than 48 h to ensure uniform ball milling. The prepared casting film slurry was vacuumized for 2 h until the residual air bubbles were removed. Then pour it into the slurry tank, the inner core liquid is deionized water, the flow rate is 30 mL / min, and the nitrogen pressure of 0.1 MPa is applied, and the wet fiber film extruded from the spinneret is immersed in the outer coagulation bath through an air gap of 15 cm After 24 hours in deionized water, the hollow fiber membrane was gelled and solidified into a green body. Then sintered at 1250°C, t...
Embodiment 2
[0086] 1. γ-Al 2 o 3 The intermediate layer modifies the ceramic base, and prepares the method for ceramic base pure Defect-free-UiO-66 forward osmosis membrane, the steps are as follows:
[0087] (1) Preparation of zirconia ceramic support
[0088] Using industrial zirconia powder with a particle size of 200nm as raw material, zirconia green body is prepared by wet spinning-phase inversion method, and then calcined at high temperature to obtain zirconia ceramic carrier.
[0089] (2) γ-Al 2 o 3 Preparation of the middle layer
[0090] Prepare the oxide γ-Al with a concentration of 0.1wt% 2 o 3 sol, using the impregnation process to coat the outer surface of the zirconia hollow fiber substrate with uniform γ-Al 2 o 3 Sol; in the above process, the dipping time was controlled to be 1 s, and the pulling speed was controlled to be 0.5 cm / s to obtain a uniformly coated pre-carrier. The γ-Al with a thickness of 1.0 μm was prepared on the zirconia hollow fiber substrate by s...
Embodiment 3
[0094] 1. γ-Al 2 o 3 The method for modifying the ceramic substrate with the intermediate layer to prepare the ceramic-based pure ML-UiO-66 forward osmosis membrane, the steps are as follows:
[0095] (1) Preparation of pure ML-UiO-66 film
[0096] ZrO prepared in part (3) 2 @γ-Al 2 o 3 Preparation of ultrathin ML-UiO-66 film on substrate: ZrO with both ends sealed with green tape 2 @γ-Al 2 o 3 The substrate is placed vertically in a polytetrafluoroethylene reactor, according to ZrCl 4 :H 2 BDC:CH 3 COOH: DMF = 1:1:25:500 molar ratio to prepare the synthesis mother liquor of ML-UiO-66 film, after stirring evenly, in situ crystallization at 120 ℃ for 48 h, the preparation of a complete and continuous film with crystal interior Defective metal-organic framework ML-UiO-66 (ML: Mssing-linker) film.
[0097]For the application of pure UiO-66 membrane, putting the complete pure UiO-66 membrane into the hollow fiber membrane module can be used for water treatment. Since t...
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