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Method of liquid-phase catalysis processing bromate in water

A liquid-phase catalysis and bromate technology, which is applied in the field of bromate degradation, can solve problems such as difficult control of reaction conditions, influence on bromate removal, and economic infeasibility, and achieve significant degradation effect, good economic and environmental benefits, technically feasible effect

Inactive Publication Date: 2009-11-25
NANJING UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wherein ammonia can be combined with HOBr to generate bromamine, thereby reducing the amount of bromate generation, but this will inevitably produce secondary pollution; reducing the pH value can effectively control bromate generation, but it is not economically feasible, and ammonia and Appropriately lowering the pH can only reduce 50% of the amount of bromate generated; activated carbon adsorption has a good effect on the removal of bromate, and there are also reports in the literature that activated carbon can catalyze the decomposition of bromic acid, but the reaction conditions are not easy to control. After a long period of use, Activated carbon has deactivation phenomenon, which affects the removal of bromate

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] Pd / Al with 5% Pd loading 2 o 3 As a catalyst, liquid-phase hydrogenation catalyzes the degradation of bromate in water. The catalyst concentration is 0.5g / L, the initial concentration of bromate pollutants in water is 50mg / L, the reaction pH value is 2, the hydrogen flow rate is 40ml / min, the reaction is 2h under normal temperature and pressure, and the degradation rate of bromate is within ten 100% within minutes.

[0018] It can be seen that the degradation of bromate by catalytic hydrogenation is a very effective and feasible method.

Embodiment 2

[0026] Pd / Al with 5% Pd loading 2 o 3 As a catalyst, liquid-phase hydrogenation catalyzes the degradation of bromate in water. The catalyst concentration is 0.5g / L, the initial concentration of bromate pollutants in water is 50mg / L, the reaction pH value is 4, the hydrogen flow rate is 40ml / min, and the reaction is carried out at normal temperature and pressure for 2 hours. The degradation rate of bromate is within three 100% within ten minutes.

[0027] As the pH value increased, the degradation rate decreased.

Embodiment 3

[0032] Pd / Al with 5% Pd loading 2 o 3 As a catalyst, liquid-phase hydrogenation catalyzes the degradation of bromate in water. The volume of the reactant is 200mL, the catalyst concentration is 0.5g / L, the initial concentration of bromate pollutants in water is 50mg / L, the reaction pH value is 6, the hydrogen flow rate is 40ml / min, and the reaction is carried out at normal temperature and pressure for 2 hours. The degradation rate of salt reached 100% within seventy minutes.

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PUM

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Abstract

The invention discloses a method of liquid-phase catalysis processing bromate in water, adding aluminum oxide catalyst containing precious metal into water containing bromate pollutant and regulating pH value of the water to 2-8, then infusing hydrogen gas for degradation reaction. The invention provided method of liquid-phase degradation of bromate with catalyst hydrogen shows prominent degradation effect, high bromate degradation efficiency, fast speed, simple operation technical feasibility, and the materials are easy to get without secondary pollution. The invention for degrading bromate in water possesses favorable economic and environmental benefits.

Description

technical field [0001] The invention belongs to the field of liquid-phase catalysis and drinking water treatment, and in particular relates to a bromate degradation method and application thereof. Background technique [0002] Bromate is a strong oxidizing agent and a potential carcinogen classified as Class 2B (higher carcinogenic potential) by the International Agency for Research on Cancer. High doses of bromate can cause damage to the renal tubules of animals, and tumors may be induced in the kidneys and thyroid of animals exposed for a long time. In addition, there are results showing that potassium bromate can produce obvious mutagenic effects, and bromate is genotoxic at high doses. [0003] The main source of bromate in water bodies is chemical disinfection by-products of drinking water. Bromide ions widely exist in water bodies, and the bromide ions mainly come from mineral dissolution, seawater intrusion into surface water or groundwater aquifers. In addition, i...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/70C02F101/12
Inventor 郑寿荣陈欢许昭怡郑建中李丽媛劭芸刘凤玲王家宏刘景亮
Owner NANJING UNIV
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