Preparation of polyacrylonitrile-polyvinyltetrazole chelate resin

Abstract

The invention belongs to the technical field of chemical materials, relates to preparation of chelate resin, and in particular relates to tetrazolyl-containing polyacrylonitrile-polyvinyltetrazole chelate resin with a function of adsorbing heavy metal ions in various water bodies. The preparation method is characterized by comprising the following steps: I, synthesizing a polyacrylonitrile-polyvinyltetrazole copolymer (PAN-PVT) through a reaction of polyacrylonitrile, sodium azide and ammonium chloride; and II, preparing spherical resin with a requested particle size from slurry of a copolymerization product under the action of a water-in-oil dispersing aid, and performing interstrand crosslinking at a rising temperature, thereby gelatinizing a liquid material into solid spherical resin. The preparation has the advantages that the chelate resin has extremely high adsorption properties through multi-point coordination of metal ions, a preparation process is simple, expensive equipment is not needed, and the application is wide.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, in particular to a chelating resin, in particular to a polyacrylonitrile-polyvinyl tetrazolium chelating resin capable of absorbing heavy metal ions in various water bodies. Background technique [0002] With the rapid development of industrialization and urbanization, the problem of environmental pollution is becoming increasingly serious. The pollution of wastewater containing heavy metal ions such as lead, copper, chromium, and mercury from electrolytes, electroplating solutions, and mining and metal smelting processes is even more serious. It has become an urgent need to solve economic development, environmental protection, and drinking water safety. key problem. [0003] Chelating resin can selectively chelate specific metal ions in the form of ionic bonds or coordination bonds from a solution containing metal ions. Compared with ion exchange resins, chelating resins have a stron...

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Problems solved by technology

However, in the synthesis process of this type of resin, chloromethyl ether needs to be used, and the grafted ligand is generated by hydrogen chloride waste, which seriously pollutes the environment and the elution rate is not high.

Chelating resins based on natural raw materials, as disclosed in Chinese patents ZL201210430562.0 and ZL201010107973.7, have the advantages of wide sources, low price, and easy degradation. However, these materials have low stability, poor mechanical strength, and poor adsorption capacity. The amount is low, not easy to regenerate and other deficiencies so that its application is limited

Chelating resins synthesized by polycondensation mechanism, as announced in Chinese patents ZL200910058178.0, ZL201310083943.0, and CN200510044986.3, can partially remove heavy metal ions in water, but their coordination ability is limited, and the adsorption efficiency of heavy metal ions is not high. high, and the synthesis conditions are harsh, the preparation process is complicated, and it is difficult to meet various requirements. It is urgent to research and develop chelating resin materials that can meet the separation requirements of special environments.

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