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Preparation method of composite electrode based on electroadsorption to remove arsenic in water and its method for removing arsenic

A composite electrode, electro-adsorption technology, used in cable/conductor manufacturing, separation methods, chemical instruments and methods, etc., can solve problems such as weak arsenic interaction ability and limited carbon adsorption capacity

Inactive Publication Date: 2016-03-09
CHANGSHA HAOLONG ENVIRONMENTAL PROTECTION TECH
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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

[0013] Activated carbon fiber (ACF, 0.5 cm thick, 2 cm area 2 ) was first activated by immersing in (0.1mol / L) dilute nitric acid for 6 hours, and washed with water. Then, place the ACF on the flake Fe-MnO 2 Soak in the aqueous solution and shake continuously for 6h; put it into the freeze drier to dry for 4h, so that the MnO loaded on the activated carbon fiber 2 Sublimation of water; finally in N 2 Activated at 700°C for 1h under protection. After the tube furnace was cooled to room temperature, the Fe-MnO 2 / ACF and washed several times with distilled water, dried in an oven, and set aside.

[0014] The above Fe-MnO 2 The preparation method of the aqueous solution is as follows: 20 mL of a mixed solution of 0.1 mol / L tetramethylamine (TMA-OH, ex-factory concentration: 25%) and 3 wt % hydrogen peroxide, within 15 seconds, add 10 mL of 0.1 mol / L manganese salt and 0.01mol / L iron salt solution, shake for 12 hours to get Fe-MnO 2 solution.

[0015] Fix the two composit...

Embodiment 2

[0017] Activated carbon fiber (ACF, 0.5 cm thick, 2 cm area 2 ) was first activated by immersing in (0.1mol / L) dilute nitric acid for 6 hours, and washed with water. Then, place the ACF on the flake Fe-MnO 2 Soak in the aqueous solution and shake continuously for 6h; put it into the freeze drier to dry for 4h, so that the MnO loaded on the activated carbon fiber 2 Sublimation of water; finally in N 2 Activated at 700°C for 1h under protection. After the tube furnace was cooled to room temperature, the Fe-MnO 2 / ACF and washed several times with distilled water, dried in an oven, and set aside.

[0018] The above Fe-MnO 2 The preparation method of the aqueous solution is as follows: 20 mL of a mixed solution of 0.6 mol / L tetramethylamine (TMA-OH, 25%) and 3 wt % hydrogen peroxide, within 15 seconds, add 10 mL of 0.3 mol / L manganese to the above mixed solution Salt and 0.03mol / L iron salt solution, shake for 12h to get Fe-MnO 2 solution.

[0019] Fix the two prepared com...

Embodiment 3

[0021] Activated carbon fiber (ACF, 0.5 cm thick, 2 cm area 2 ) was first activated by immersing in (0.1mol / L) dilute nitric acid for 6 hours, and washed with water. Then, the activated ACF was placed on the flake Fe-MnO 2 Soak in the aqueous solution and shake continuously for 6h; put it into the freeze drier to dry for 4h, so that the MnO loaded on the activated carbon fiber 2 Sublimation of water; finally in N 2 Activated at 700°C for 1h under protection. After the tube furnace was cooled to room temperature, the Fe-MnO 2 / ACF and washed several times with distilled water, dried in an oven, and set aside.

[0022] The above Fe-MnO 2 The preparation method of the aqueous solution is as follows: 20 mL of a mixed solution of 1.2 mol / L tetramethylamine (TMA-OH, 25%) and 3 wt % hydrogen peroxide, within 60 seconds, add 10 mL of 0.6 mol / L manganese to the above solution Salt and 0.03mol / L iron salt solution, shake for 24h to get Fe-MnO 2 solution.

[0023] Fix the two com...

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Abstract

The invention discloses a preparation method of an active carbon fiber composite electrode for removing arsenic in water based on an electro-adsorption. The method concretely comprises the following steps: firstly, soaking active carbon fiber into dilute nitric acid or sodium hydroxide for 1-24 hours to activate the active carbon fiber, washing the active carbon fiber by using water; then soaking the active carbon fiber into a water solution of flake Fe-MnO2 and vibrating for 1-24 hours; drying the active carbon fiber in a freezer dryer for 1-5 hours so as to sublimate MnO2 moisture loaded on the active carbon fiber; and finally activating at 400-700 DEG C under protection of N2 for 1-5 hours; cooling to room temperature; taking out Fe-MnO2 / ACF and washing by using distilled water for a plurality of times, and baking in an oven. The method for preparing the composite electrode disclosed by the invention is simple and feasible, the characteristics that the existing technology for processing trace heavy metal elements in drinking water is complicated and does not have selectivity are solved, a good technical support is provide for health of the masses, and the method has a 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): B01J20/20C02F1/469C02F1/58H01B13/00
Inventor 彭亮田川秦普丰戴春皓
Owner CHANGSHA HAOLONG ENVIRONMENTAL PROTECTION TECH
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