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Catalyst for catalytic reduction of bromate in water and preparation method thereof

A catalyst, bromate technology, applied in physical/chemical process catalysts, chemical instruments and methods, reduced water/sewage treatment, etc., can solve the problems of poor disinfection effect, unsuitable use, water pollution, etc., and achieve good recovery and recycling. Utilize, reduce influence, effect of high saturation magnetization

Inactive Publication Date: 2015-04-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding ammonia will pollute the water body, and will accelerate the decomposition rate of ozone, making the disinfection effect worse
[0010] d. Add ferrous sulfate and other reducing agents. Although this method can reduce the content of bromate to a very low level, it will also pollute the water quality, so it is not suitable to use

Method used

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  • Catalyst for catalytic reduction of bromate in water and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 2.7 grams of ferric chloride hexahydrate and 2 grams of polyethylene glycol were dissolved in 80 milliliters of ethylene glycol, and after dissolving, the solution was placed in a 100 milliliter hydrothermal kettle and reacted in an oven at 180 degrees Celsius for 10 hours. The obtained product was washed three times with ethanol, and then dried at 60° C. for 12 hours to obtain monodisperse ferric oxide nanospheres. The particle size distribution of the nanospheres is between 300 and 500 nanometers.

[0034] Dissolve a certain amount of palladium chloride in 50 milliliters of 0.05 mol / liter sodium chloride solution, disperse 1 gram of ferric oxide in it after dissolving, and feed hydrogen gas after ultrasonication for 10 minutes (hydrogen flow rate 100 milliliters / liter) minute). After passing hydrogen gas for 1 hour, the product was magnetically separated, washed with deionized water until no chloride ions were detected, and monodisperse Pd / Fe was obtained. 3 o 4 ca...

Embodiment 2

[0038] With the Pd content prepared in embodiment 1 is the Pd / Fe of 0.1% 3 o 4 Catalyst for catalytic reduction of bromate in water experiment.

[0039]The catalyst consumption is 0.2 g / L, the bromate content in water is 50 mg / L, the hydrogen consumption is 100 mL / min, the stirring speed is 600 rpm, and the pH value of the solution is 7. The results show that after 60 minutes, bromate in water can be completely reduced, and the reduction product is bromide ion.

[0040] Change the amount of hydrogen to be 50 ml / min and 200 ml / min, respectively, the catalytic reduction of bromate is not affected; Reducing bromate was also unaffected.

Embodiment 3

[0042] Pd / Fe with a Pd content of 0.1% in aqueous solutions of different pH values 3 o 4 Catalyst for catalytic reduction of bromate in water experiment.

[0043] The catalyst consumption is 0.2 g / L, the bromate content in water is 50 mg / L, the hydrogen consumption is 100 mL / min, the stirring speed is 600 rpm, and the pH value is adjusted with hydrochloric acid and sodium hydroxide.

[0044] When the pH value is 6, the initial reaction speed is the fastest. After 60 minutes, bromate in water can be completely reduced, and the reduction product is bromide ion.

[0045] When the pH value is 4, after 60 minutes, bromate in water can be completely reduced, and the reduction product is bromide ion.

[0046] When the pH value is 8, after 60 minutes, only 72.5% of bromate in water is reduced, and the reduction product is bromide ion.

[0047] When the pH value is 10, after 60 minutes, only 59% of bromate in water is reduced, and the reduction product is bromide ion.

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Abstract

The invention discloses a catalyst for catalytic reduction of bromate in water and a preparation method thereof, and belongs to the technical fields of catalyst and preparation technology thereof. The preparation method provided by the invention is as below: first synthesizing ferriferrous oxide nanospheres; then dissolving palladium chloride in a common salt solution; dispersing the synthesized ferriferrous oxide nanospheres in the solution; conducting ultrasonic and hydrogen induction on the solution; carrying out magnetic separation on products; and washing to obtain monodispersed catalyst for catalytic reduction of bromate in water. The prepared catalyst comprises ferriferrous oxide nanospheres and palladium nanometer particles loaded on the surfaces of the nanospheres, and the palladium nanometer particles account for 0.1-1 wt% of the catalyst. The catalyst can well perform in catalytic reduction of bromate in water, and can be recovered through an applied magnetic field method; and the catalyst can be reused for more than 10 times and shows no obvious reduction in catalysis efficiency.

Description

technical field [0001] The invention relates to the technical field of structural catalysts, in particular to a high-activity, high-dispersion and easy-to-separate catalyst for catalytically reducing bromate in water and a preparation method thereof. Background technique [0002] With the increasing pollution of drinking water sources and the improvement of water quality standards, people have put forward higher requirements for drinking water. As an important part of water quality control, drinking water disinfection has attracted more and more attention. As the most widely used disinfection method for drinking water-the disadvantages of adding chloride disinfection methods are gradually being recognized by people. Chlorine disinfection will produce other halogenated by-products such as trihalomethanes, which are mutagenic and carcinogenic, and pose a threat to human health. Therefore, it is the common goal of relevant researchers to find excellent disinfectants. In compa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J35/08C02F1/70C02F1/58
Inventor 孙武珠李琦高世安尚建库
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI