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Method for removing arsenic in arsenic-containing water by electroadsorption with hydrothermal synthesis composite electrode

A composite electrode, hydrothermal synthesis technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of weak arsenic interaction and limited carbon adsorption capacity.

Active Publication Date: 2015-10-21
湖南玖恪环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, carbon materials are used as electrodes for electrosorption, but the adsorption capacity of carbon is limited, and the interaction ability with arsenic is weak.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Activated carbon fibers (ACF, 0.5 cm in thickness, 5 cm in area 2 ) was first activated by immersing in 0.1mol / L dilute nitric acid for 24 hours, and then washed with water. Then the activated ACF is placed in a high-temperature reactor, and 2 mmol of manganese salt and 0.01 mmol of iron salt are added per gram of ACF, and K 2 S 2 o 8 2mmol, 4mL concentrated sulfuric acid and 76mL distilled water standard, mix well. Finally, the high-temperature reactor was sealed and reacted at a constant temperature of 110° C. for 6 hours. After cooling to room temperature, it was washed with distilled water and dried in an oven to form a composite electrode.

[0008] Fix the two composite electrodes in the polyethylene shell and connect them to the external stabilized power supply, so that the voltage between the two electrodes is 1.5V, the distance between the two electrodes is 0.1cm, and a polyethylene mesh pad is set between the two electrodes to prevent short circuit between ...

Embodiment 2

[0010] Activated carbon fiber (ACF, 0.5 cm thick, 5 cm area 2 ) was activated by immersing in 0.1mol / L sodium hydroxide solution for 24 hours, and washed with water. Then the activated ACF is placed in a high-temperature reactor, and 2 mmol of manganese salt and 0.2 mmol of iron salt are added per gram of ACF, and K 2 S 2 o 8 2mmol, 4mL concentrated sulfuric acid and 76mL distilled water standard, mix well. Finally, the high-temperature reactor was sealed and reacted at a constant temperature of 110° C. for 6 hours. After cooling to room temperature, it was washed with distilled water and dried in an oven to form a composite electrode.

[0011] Fix the two composite electrodes in the polyethylene casing and connect them to external stabilized power supplies, so that the voltage between the two electrodes is 1.5V, the distance between the two electrodes is 0.1cm, and a polyethylene mesh pad is set between the two electrodes to prevent short circuit between the two electrode...

Embodiment 3

[0013] Activated carbon fiber (ACF, 0.5 cm thick, 5 cm area 2 ) was first activated by immersing in 0.1mol / L dilute nitric acid for 24 hours, and then washed with water. Then the activated ACF is placed in a high-temperature reactor, and 2 mmol of manganese salt and 0.4 mmol of iron salt are added per gram of ACF, and K 2 S 2 o 8 2mmol, 4mL concentrated sulfuric acid and 76mL distilled water standard, mix well. Finally, the high-temperature reactor was sealed and reacted at a constant temperature of 110° C. for 6 hours. After cooling to room temperature, it was washed with distilled water and dried in an oven to form a composite electrode.

[0014] Fix the two composite electrodes in the polyethylene casing and connect them to external stabilized power supplies, so that the voltage between the two electrodes is 1.5V, the distance between the two electrodes is 0.1cm, and a polyethylene mesh pad is set between the two electrodes to prevent short circuit between the two elect...

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Abstract

The invention provides a combination electrode hydro-thermal synthesis method for removing arsenic in water based on electro-adsorption. The combination electrode hydro-thermal synthesis method specifically comprises the following steps of: soaking active carbon fibers in dilute nitric acid or a sodium hydroxide solution for 1-24h for activation, and then washing with water; next, putting the activated active carbon fibers in a high-temperature reaction kettle, adding 2mmol of manganese salt, 0.01-0.4mmol of iron salt, 1-4mmol of K2S2O8, 2-8mL of concentrated sulfuric acid and 60-90mL of distilled water to the high-temperature reaction kettle per 1 gram, and mixing evenly; and finally, sealing the high-temperature reaction kettle, reacting at a constant temperature ranging from 90 to 150 DEG C for 2-24h, cooling to the room temperature and then washing with distilled water, and drying in an oven. The method of preparing the combination electrode provided by the invention is simple and feasible, overcomes the shortcoming that the existing drinking water trace heavy metal element treatment technology is complex and has no choice, provides excellent technical guarantee for the body health of people and has good application value.

Description

technical field [0001] The invention relates to a method for removing arsenic in water, in particular to a method for removing arsenic in water by electric adsorption of a novel electrode. Background technique [0002] At present, heavy metal pollution in water has attracted widespread attention. Water is indispensable for human survival. Drinking water directly affects the human body. Therefore, the quality of drinking water directly affects the health of human beings. Since the beginning of the 20th century, arsenic has been widely used in chemical and pesticide industries, and the pollution of arsenic has become more and more serious. A large amount of arsenic is discharged into the environment through waste gas, waste residue, and waste water, causing air, water, and soil pollution. Air pollutants enter rivers and lakes along with precipitation, thereby causing drinking water pollution. At present, the commonly used methods for removing heavy metals include chemical pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20C02F1/48C02F1/58
Inventor 彭亮秦普丰戴春皓曾清如田川
Owner 湖南玖恪环境工程有限公司
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