Synthesis and preparation method of dearsenifying resin

Abstract

The invention discloses a synthesis and preparation method of dearsenifying resin, which comprises the following steps: uniformly mixing divinylbenzene, acrylonitrile and isoamyl alcohol according to a certain mass ratio to obtain an organic phase; dissolving cerous sulfate in deionized water to prepare a water solution with a certain concentration, adding a certain mass ratio of polyvinyl alcohol, and uniformly stirring to obtain a solution; dissolving urea in deionized water to prepare a urea saturated solution, adding the urea saturated solution into the solution according to the volume ratio, and uniformly stirring to obtain a water phase; adding the organic phase into the water phase according to a certain mass ratio, stirring until the oil drop diameters are distributed within a certain range, adding benzoyl peroxide, heating to carry out thermostatic reaction, curing at constant temperature for several hours, and filtering to obtain solid particles; and soaking the particles in a sodium hydroxide solution for several hours, filling into a resin column, leaching with a sodium hydroxide+sodium hypochlorite mixed solution until the effluent liquid is clear and transparent, and filtering to obtain the product. The product has the advantages of high selectivity for arsenium in the water solution, and high adsorption capacity, can be easily regenerated, can concentrate arsenium in the regenerated solution for industrial reutilization, and is free from secondary pollution.

Description

technical field [0001] The invention belongs to the technical fields of water treatment such as environmental protection and chemical industry, and in particular relates to a method for synthesizing and preparing arsenic-removing resin. Background technique [0002] Arsenic is a protoplasmic poison, a toxic element, and has a wide range of biological effects. Many compounds formed by it have toxic effects on organisms, and most of them are highly toxic. The most famous one is arsenic, whose chemical composition is As 2 o 3 . [0003] The existence of arsenic in nature is generally in the form of sulfide which is extremely insoluble in water, so it will not cause toxicity to organisms, but due to factors such as artificial or natural oxidation, it will form oxides and dissolve in water. Arsenic compounds are quite stable in water. If the water temperature rises, the arsenic compounds deposited on the bottom of the river will re-dissolve; very big. [0004] In order to pre...

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Problems solved by technology

[0007] Chemical precipitation method: Put a certain amount of lime, ferrous sulfate, etc. into the arsenic-containing water body to precipitate arsenic and iron together; or put sulfide into it to make arsenic form arsenic sulfide that is extremely difficult to dissolve in water and precipitate; these The methods all have obvious defects: the one, it is difficult to reduce the arsenic in the water body to a safe range (such as reaching the national standard of 0.04mg / L), so the treated water body is also difficult to reach drinking or discharge standards; A large amount of chemical reagents are put into the water to change the ion concentration in the water body, which directly affects the water quality; the third is to generate a large amount of arsenic-containing sludge, which lacks the value of industrial utilization and is rich in arsenic, which is a hidden danger of secondary pollution

[0008] Physical separation method: use special filtration equipment (such as osmotic membrane, etc.) to separate arsenic from water and meet the drinking standard; this type of method is mainly due to large equipment investment, high cost, small processing capacity, and the membrane is easily damaged. Not suitable for large-scale, low-cost treatment of water bodies with excess arsenic

[0009] At present, most of them use inorganic salts to remove arsenic, which has many by-products, is difficult to handle, and easily causes secondary pollution. Moreover, the high cost of materials and the difficulty of regeneration and reuse limit their industrial application.

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