Preparation method of polyether sulfone separation membrane with polyaminocarboxylic acid group

Abstract

Disclosed is a preparation method of a polyether sulfone separation membrane with a polyaminocarboxylic acid group. Firstly, chloroacetylated polyethersulfone with a high grafting rate is prepared bytwo times of chloroacetylation; secondly, chloroacetylated polyether sulfone and a prepared diethylenetriamine and diethylenetriaminepentaacetic acid mixed organic solution are subjected to a chemicalbonding reaction in a N,N-dimethyl acetamide solvent; thirdly, a polyethersulfone membrane casting solution with the polyaminocarboxylic acid functional group is prepared by chemical grafting; and finally, the modified polyether sulfone separation membrane is prepared by using phase transfer technology. The preparation method of the invention is simple and feasible. The prepared modified polyether sulfone separation membrane can efficiently remove heavy metal pollutants in water and is provided with a stable hydrophilic layer. The grafted aminocarboxylic acid chelating group is stable, is notprone to falling off and leaching out, has good regeneration performance, and has broad application prospects in the field of heavy metal wastewater pollution disposal.

Description

technical field [0001] The invention relates to a preparation method of a polyethersulfone separation membrane. Background technique [0002] In recent years, production processes such as waste rock and tailings leaching, non-ferrous metal smelting and processing, iron and steel smelting, electroplating, electroless plating, and precision electronics manufacturing associated with mining have discharged a large amount of heavy metal wastewater, resulting in heavy metal ions and their compounds in the The accumulation of surface water, soil and groundwater has caused serious ecological pollution. As we all know, lead, nickel, cadmium, mercury, chromium, copper, zinc and other heavy metal pollutants discharged into water are biodegradable and highly toxic. They are easy to accumulate in organisms and can be transmitted through the biological chain, thereby affecting Serious harm to environmental biological survival and human health. Therefore, the treatment of heavy metal pol...

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Problems solved by technology

The chloroacetyl chloride-diethylenetriamine-polyethersulfone separation membrane prepared by this patented technology has a good adsorption effect on Cu(II) and phosphate, but it has a good adsorption effect on Pb(II), Ni(II) and Cd( II) and other heavy metal pollutants have limited adsorption and removal

The invention patent with the patent number CN201710036693.3, on the basis of the technology described in the patent CN 103041719 A, optimizes the design of the adsorption functional group. In the mixed solution of methanol and triethylamine, the chemically grafted polyvinylamine and The phosphonation reaction of paraformaldehyde and phosphorous acid was carried out, and then the aminophosphonic acid functional group was introduced into the polyethersulfone separation membrane, which effectively improved the adsorption and capture efficiency of the separation membrane for heavy metals, but this technology has low phosphonation efficiency and process The control is cumbersome, and the heavy metal adsorption performance needs to be improved.

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