A kind of non-woven fabric based forward osmosis membrane and its preparation method and application

Abstract

The invention belongs to the technical field of filtering materials, and discloses a non-woven cloth based forward osmosis membrane as well as a preparation method and application thereof. The non-woven cloth based forward osmosis membrane comprises a non-woven cloth support layer and a polyamide active layer, wherein the polyamide active layer is compounded on the non-woven cloth support layer; the quantity of the non-woven cloth support layer is 5-40 g / m<2>; the thickness of the non-woven cloth support layer is 10-55 [mu]m; the average aperture of the non-woven cloth support layer is 5-35 [mu]m; the porosity of the non-woven cloth support layer is greater than or equal to 80%. Wet-method non-woven cloth is used as a support layer material, and the polyamide active layer is prepared from a water-phase solution with alkylated fatty amine or a multi-functional amino compound and an oil-phase solution with an acid chloride compound on the wet-method non-woven cloth via upper-interface polymerization. The water flux of the forward osmosis membrane disclosed by the invention is as high as 80.9 L / (m<2>*h), and the salt retention rate of the forward osmosis membrane is greater than or equal to 97%. The water flux of the forward osmosis membrane is far higher than that of a conventional commercial forward osmosis membrane, and meanwhile a high salt retention rate is maintained. The forward osmosis membrane can be applied to fields such as sweater treatment and wastewater recycling.

Description

technical field

[0001] The invention belongs to the technical field of filter materials, and in particular relates to a non-woven fabric-based forward osmosis membrane and a preparation method and application thereof. Background technique

[0002] Forward osmosis technology is a spontaneous membrane separation technology without external pressure. During the separation process, the osmotic pressure difference between the solutions on both sides is used as the driving force to achieve membrane separation. Compared with reverse osmosis and other membrane separation technologies, forward osmosis can be carried out at room temperature without external driving pressure, which can effectively reduce membrane pollution, reduce energy consumption, and be more environmentally friendly. However, the development of forward osmosis technology is currently restricted, and the main bottleneck is the lack of suitable high-performance forward osmosis membranes. In the process of forward os...

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