Method for removing bromates from water by homogeneous photocatalysis

A bromate and water removal technology, used in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problem of poor stability of ferrous ions and zero-valent iron, limited adsorption capacity of activated carbon, and large ultraviolet radiation dose. and other problems, to achieve the effect of strong water quality applicability, strong feasibility and operability, and good safety.

Inactive Publication Date: 2018-04-13
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Abstract
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Problems solved by technology

However, the study found that when removing bromate in water, the adsorption capacity of activated carbon is limited, the stability of ferrous ions and zero-valent iron is poor, the dose of ultraviolet radiation is large, there is secondary pollution in biodegradation, UV / TiO 2 Catalytic removal is affected by the adsorption capacity of pollutants on the catalyst surface, and TiO 2 separation

Method used

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  • Method for removing bromates from water by homogeneous photocatalysis
  • Method for removing bromates from water by homogeneous photocatalysis
  • Method for removing bromates from water by homogeneous photocatalysis

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Experimental program
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Effect test

Embodiment 1

[0041] 1.0mol / L sodium sulfite solution and 0.1mmol / L bromate solution were prepared in advance with distilled water, and both sodium sulfite solution and bromate solution were prepared on the same day.

[0042] The cooling water in the quartz well is constantly exchanged by a peristaltic pump, so that the reaction is carried out at a constant temperature of 25±0.5°C; 2 ) to preheat for 20 minutes.

[0043] Add an equal amount of bromate solution to 6 quartz tubes (1#, 2#, 3#, 4#, 5#, 6#) to adjust the initial pH value to 6.8, and the 2# quartz tube uses aluminum foil Seal with paper to make it opaque, then add sodium sulfite solution to 6 quartz tubes at the same time, and control the concentration of sodium sulfite to 0.0mmol / L, 1.0mmol / L, 0.5mmol / L, 1.0mmol / L, 1.5mmol / L and 2.0mmol / L, turn on the device, make the quartz tube rotate around the ultraviolet lamp at a constant speed to ensure uniform radiation of ultraviolet light, and at the same time use a magnetic stirrer t...

Embodiment 2

[0048] 1.0mol / L sodium sulfite solution and 0.1mmol / L bromate solution were prepared in advance with distilled water, and both sodium sulfite solution and bromate solution were prepared on the same day.

[0049] The cooling water in the quartz well is constantly exchanged by a peristaltic pump, so that the reaction is carried out at a constant temperature of 25±0.5°C; 2 ) to preheat for 20 minutes.

[0050] Add an equal amount of bromate solution to five quartz tubes, and use 0.1mmol / L NaOH solution and 0.1mmol / L HCl solution to adjust the initial pH value of the system to 4.0, 6.0, 7.0, 9.0 and 10.0, and then add five Add sodium sulfite solution with a concentration of 1.0mmol / L to two quartz tubes at the same time, turn on the device, and make the quartz tube rotate around the ultraviolet lamp at a constant speed to ensure uniform radiation of ultraviolet light. At the same time, use a magnetic stirrer to stir the solution to ensure that the solution is mixed. uniform.

[...

Embodiment 3

[0054] Dithionite solution of 1.0mol / L and bromate solution of 0.1mmol / L were prepared in advance with distilled water, and dithionite solution and bromate solution were prepared on the same day.

[0055] The cooling water in the quartz well is constantly exchanged by a peristaltic pump to keep the reaction constant at 25±0.5°C; 2 ) to preheat for 20 minutes.

[0056] Add an equal amount of bromate solution to 6 quartz tubes (1#, 2#, 3#, 4#, 5#, 6#) to adjust the initial pH value to 6.8, and the 2# quartz tube uses aluminum foil Seal it with paper to make it opaque, then add dithionite to 6 quartz tubes at the same time, and control the concentration of dithionite to 0.0mmol / L, 2.0mmol / L, 1.0mmol / L, respectively. L, 1.5mmol / L, 2.0mmol / L and 2.5mmol / L, turn on the device to make the quartz tube rotate around the UV lamp at a constant speed to ensure uniform radiation of ultraviolet light, and at the same time use a magnetic stirrer to stir the solution to ensure that the solut...

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Abstract

The invention relates to a method for removing bromates from water by homogeneous photocatalysis. The method concretely comprises the following steps: adding a reducing agent to bromate-containing water to be treated, stirring the reducing agent and the water, irradiating the obtained solution with ultraviolet lights to generate reducing free radicals, and carrying out a reducing reaction to remove the bromates from the water. The reducing agent is irradiated with the ultraviolet lights to generate the reducing free radicals, a redox reaction occurs to achieve the purpose of removing bromates,the reducing agent is a conventional reducing agent having a low price, the bromate removal rate can reach 99% or more, and the final product is bromide ions. The method has the advantages of no introductio of other poisonous and harmful substances, simplicity in operation, mild and easily controlled conditions, achieving of the purpose of economical, efficient, secondary pollution-free, condition-mild and water adaptability-strong removal of the bromates from the water, great practical significance and wide prospect.

Description

technical field [0001] The invention belongs to the technical field of water treatment and relates to the treatment and utilization of bromate-containing wastewater, in particular to a method for homogeneous photocatalytic removal of bromate in water. Background technique [0002] The safety of drinking water caused by water pollution is a serious threat to people's health. Improving water purification efficiency while controlling by-products has become the core task of water purification technology. Due to its recognized advantages, the ozone-activated carbon process has been promoted as a mainstream advanced treatment process in many developed countries and has begun to be adopted in my country. In the ozone-activated carbon process, ozone molecules can directly oxidize bromide ions to generate bromate, and can also Bromide ions are oxidized to bromate through the combined action of hydroxyl radicals and ozone. The serious consequence is that the bromate exceeds the standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/12
CPCC02F1/325C02F1/444C02F1/58C02F1/66C02F1/722C02F9/00C02F2101/12
Inventor 王婷张志斌史义雄王松林蒋金辉刘志然
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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