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A process for defluoridation of surface water based on carbon nanotube three-dimensional electrode

A technology of carbon nanotubes and three-dimensional electrodes, which is applied in the direction of water pollutants, water/sewage treatment, water/sewage treatment equipment, etc., can solve the problems of secondary pollution of water bodies and ineffective removal of fluoride, and achieve stable removal, Good chemical stability, high conductivity effect

Active Publication Date: 2022-01-14
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the purpose of this application is to provide a surface water defluorination process based on carbon nanotube three-dimensional electrodes, which overcomes the defects in the prior art that fluoride in water cannot be effectively removed, causing secondary pollution of water, etc.

Method used

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  • A process for defluoridation of surface water based on carbon nanotube three-dimensional electrode
  • A process for defluoridation of surface water based on carbon nanotube three-dimensional electrode
  • A process for defluoridation of surface water based on carbon nanotube three-dimensional electrode

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Embodiment 1

[0060] A method for preparing a fluoride adsorption three-dimensional electrode, comprising the following steps:

[0061] S101, preparing powdered carbon nanotubes;

[0062] S102, using the powdered carbon nanotubes prepared in S1 to prepare sheet electrodes;

[0063] S103, preparing a carbon nanotube three-dimensional electrode material.

[0064] Further, the specific operation of said S101 is:

[0065] Heating nitric acid to 100°C-110°C, mixing with industrial grade carbon nanotubes to remove impurities;

[0066] Washing the carbon nanotubes with distilled water until the pH of the washed water is neutral;

[0067] Place it in an oven at 80°C for 12 hours, take it out and grind it into powder for later use.

[0068] Further, the purity of the nitric acid is 60%, and the purity of the industrial-grade carbon nanotubes is 98%.

[0069] Further, the specific operation of S102 is: mix 0.45-0.55g of carbon nanotubes with 15-25mL of ethanol, add 0.15-0.25mL of 75% PTFE soluti...

Embodiment 2

[0075] This embodiment is described on the basis of the above-mentioned embodiment 1, and the similarities with the above-mentioned embodiment 1 will not be repeated.

[0076] In the process of preparing powdered carbon nanotubes in this example, nitric acid was heated to 105°C, and the purity of industrial grade carbon nanotubes was 98%;

[0077] When preparing sheet electrodes, mix 0.5 g of powdered carbon nanotubes with 20 mL of ethanol, add 0.2 mL of 75% PTFE solution, and ultrasonicate for 30 minutes.

Embodiment 3

[0079] This embodiment is described on the basis of the foregoing embodiment 1 or 2, and the similarities with the foregoing embodiments will not be repeated.

[0080] This embodiment mainly introduces the use of Al on the surface of carbon nanotubes 2 o 3 Modification is carried out to increase the adsorption capacity of the three-dimensional electrode for fluoride.

[0081] The method for modifying the surface of carbon nanotubes with metal oxides specifically includes:

[0082] Mix 0.6g of carbon nanotubes with 0.004-0.006 moles of Al 2 (NO 3 ) 3 9H 2 O was dissolved in 50 mL of ethylene glycol, ultrasonicated for 1 h, and magnetically stirred for 8-12 h; then, calcined at 500 °C for 2 h in a tube furnace under a nitrogen atmosphere to prepare Al 2 o 3 Modified carbon nanotubes, wherein the ratio of metal / carbon atoms is 10% to 15%.

[0083] The beneficial effect that this embodiment obtains:

[0084] This embodiment introduces metal oxide-modified carbon nanotubes...

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Abstract

The invention relates to a surface water defluorination process based on a three-dimensional carbon nanotube electrode, which mainly includes preparing a three-dimensional electrode for fluoride adsorption, modifying the surface of a carbon nanotube with a metal oxide, building a reaction device, adding a reaction reagent, and electrifying the device. Chemisorption experiments were used to remove fluoride from surface water and determine the concentration of fluoride ions in effluent samples. The present invention introduces metal oxides to modify carbon nanotubes, further increases the specific surface area for adsorbing fluoride ions, and removes fluoride ions in water more stably; in the preparation process, ethylene glycol is used as a solvent to improve the dispersibility of carbon nanotubes and effectively reduce The agglomeration phenomenon makes the metal particles more uniformly dispersed on the tubular structure; the present invention uses titanium mesh to prepare carbon nanotubes into sheet electrodes, which can realize rapid recovery without causing secondary pollution to the water body, and the actual operation process is simple. The cost is low, and it can meet the purification treatment requirements of large flow and large volume of fluoride-contaminated surface water.

Description

technical field [0001] The invention belongs to the technical field of adsorbent preparation, and in particular relates to a surface water defluorination process based on a carbon nanotube three-dimensional electrode. Background technique [0002] Fluorine is a non-metallic element with the strongest electronegativity and the most active chemical properties. It can interact with almost all elements. Fluorine-rich soils are deposited in natural water bodies with rainwater or lake runoff, and fluorine-containing substances in the water are deposited or adsorbed. Into the mud, the fluorine content in the bottom mud will increase, and the occurrence state will be various. The safe value of fluoride ion concentration in drinking water in China is 1mg / L, but the fluorine content in drinking water in many places exceeds this standard value. With the improvement of national standards for surface water, it is necessary to deal with fluoride pollution, especially in surface water. Fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F101/14
CPCC02F1/46114C02F2001/46133C02F2101/14C02F2201/46135C02F2201/4612C02F2201/46105
Inventor 段平洲贾晓波夏瑞马淑芹后希康塔拉张凯王晓杨辰
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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