A material for removing bromate and its precursors in water, its preparation method and application

Abstract

The invention discloses a material for removing bromate and precursors thereof in water, and a preparation method and application thereof. The method comprises the following steps: (1) in a nitrogen protective atmosphere, swelling resin in a FeCl3.6H2O ethanol-water mixed solution, then adding a FeCl2.4H2O ethanol-water mixed solution, performing mixing with stirring, and then performing ultrasonic treatment, so that Fe<3+> and Fe<2+> are uniformly distributed in macropores of the resin; (2) in the nitrogen protective atmosphere, dropwisely adding a sodium hydroxide solution into the mixed solution obtained after the ultrasonic treatment in the step (1), performing a stirring reaction, and performing heating to 60-65 DEG C for a further reaction; and (3) after the reaction is completed, performing cooling to room temperature, performing filtration, performing washing, and performing drying to obtain magnetized resin which is the material for removing bromate and precursors thereof in water. The magnetized resin is applied to removal of bromate and precursors thereof in water; and the material can be recycled for a long time, and has the advantages of high removal efficiency, high separation speed and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a material for removing bromate and its precursors in water, a preparation method and application thereof. Background technique [0002] With the advancement of industrialization and urbanization, the discharge of various industrial wastewater and domestic sewage has caused great harm to ground water sources, deteriorating the quality of drinking water sources, and leading to the widespread pollution of drinking water sources worldwide. The safety of drinking water caused by water pollution is a serious threat to people's health. With the use of ozone disinfection process, it also has a negative impact on the safety of drinking water. The bromate produced by the advanced ozone treatment of drinking water has been identified as a 2B-level potential carcinogen by the International Agency for Research on Cancer. my country's "Drinking Water Hygienic Standard" (G...

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Problems solved by technology

And these methods all have deficiencies, such as the activated carbon adsorption method, when there are natural organic matter and high concentration of other ions in the water, the ability of activated carbon to remove bromate will be reduced, and when fresh activated carbon is converted to biological activated carbon (BAC), bromate The removal rate of salt shows a weakening trend, and the removal effect on bromate is poor; the cost of membrane treatment method is too high; Fe 2+ Although the removal efficiency of bromate by zero-valent iron reduction method and biological method is very high, it will inevitably produce Fe 3+ , Fe 2+ and microbial metabolites, introducing secondary pollution, and nano-zero-valent iron is easily oxidized in the air, and its stability is poor; the ultraviolet light degradation method consumes too much energy; the disadvantage of the layered double hydroxide adsorption reduction method is that in Converted to α-FeOOH and amorphous aluminum hydroxide, unable to achieve regeneration; Pd / Al 2 0 3 The disadvantage of the catalytic reduction method is that the catalyst is not easy to recover and may cause secondary pollution in water

[0007] However, the traditional anion exchange resin is not easy to maintain suspension when it reacts with raw water under agitation, and the sedimentation speed is too slow. Therefore, the traditional resin is loaded with magnetic iron oxide to make it magnetic, and it remains suspended during use. It can accelerate the resin sedimentation and realize the rapid separation of resin and water.

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