A kind of preparation method of forward osmosis membrane material
A forward osmosis membrane, base membrane technology, applied in the field of membrane separation
Active Publication Date: 2021-09-14
山东水发环境科技有限公司
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Problems solved by technology
These studies have enriched the types of forward osmosis membranes and improved the performance of the membranes. However, to further improve the water flux of forward osmosis membranes, newer materials and technologies are needed to promote the innovation and expansion of forward osmosis membranes.
Method used
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Embodiment 1
[0037] (1) Preparation of basement membrane:
[0038] a. Casting solution: Dissolve 18 g of polylactic acid (PLA) solid in 81 g of N,N-dimethylacetamide (DMAC) solution, add 6 g of polyethylene glycol-400 (PEG-400 ), the prepared casting solution was placed at 70 °C for 24 h at constant temperature and stirred at 40 °C for 24 h to ensure that the casting solution was evenly dispersed and the air bubbles were removed. The defoamed cast film The liquid is placed at room temperature for later use;
[0039] b. Non-woven fabric pretreatment: Soak the non-woven fabric in NaOH with a mass fraction of 25% for 15 minutes, transfer to an ethanol solution with a mass fraction of 50% and continue soaking for 15 minutes, then rinse with deionized water, and dry for later use .
[0040] c Scraping film: pour the casting solution at room temperature on the pretreated non-woven fabric, scrape the casting solution with a scraper to form a 110 μm thick flat film, pre-evaporate for 30 s, and i...
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The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a forward osmosis membrane material. The material is composed of 4-layer structure, and the 4-layer structure is a basement membrane, a dopamine cushion layer, a phospholipid bimolecular layer containing aquaporin and a polymer protective layer. The forward osmosis membrane prepared by the present invention has a dense non-porous structure, high-efficiency interception, and has high mechanical strength and acid and alkali resistance, and can achieve a removal effect of more than 99% of monovalent ions; it has good stability, and the permeable membrane can be cleaned The post-water flux recovery rate is high, the anti-pollution ability is strong, and the concentration polarization can be effectively alleviated, and the operation time is long. Aquaporin has the selective permeability of a single water molecule, and its water molecule transmission rate exceeds any current nanoporous material, which can ensure a substantial increase in the water flux of the composite membrane.
Description
technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a forward osmosis membrane material. Background technique [0002] The forward osmosis process is a unique technology that produces clean water with low or zero energy consumption. Forward osmosis takes the osmotic pressure difference as the driving force, and water molecules spontaneously transfer from the low-concentration feed solution side through the osmotic membrane to the high-concentration draw solution. It is reported that the theoretical energy consumption of forward osmosis is 0.25 kWh / m 3 , and because no external pressure is required, the forward osmosis membrane is not easy to be attached by pollutants, and the water recovery rate can reach 90%, which reduces the discharge of high-salt wastewater. Therefore, forward osmosis technology has gradually attracted attention due to its low energy consumption, low membrane f...
Claims
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IPC IPC(8): B01D71/06B01D61/00B01D67/00B01D69/02B01D69/12
CPCB01D61/002B01D67/0002B01D69/02B01D69/12B01D69/125B01D71/06
Inventor 吴一凡张峰赵小娟刘小稳李荣臣
Owner 山东水发环境科技有限公司