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A method for deeply purifying fluoride ions in water by using strong basic resin-based neodymium-loaded nanocomposite materials

A nano-composite material and deep purification technology, applied in chemical instruments and methods, materials of anion exchangers, ion-exchange water/sewage treatment, etc., can solve the problems of substandard discharge, secondary pollution, difficult regeneration and reuse, etc. To achieve the effect of large adsorption capacity and high stability

Active Publication Date: 2022-08-05
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of the traditional fluoride ion purification technology in water bodies such as substandard discharge, secondary pollution, and difficult regeneration and reuse, the present invention provides a method for adsorbing fluoride ions in water by using a strong basic resin-based neodymium-loaded nanocomposite material , the method is able to coexist in the water body and compete with the anion Cl - , NO 3 - , SO 4 2- 、PO 4 3- When the concentration is much higher than the target fluoride ion, the adsorption of fluorine in water can be achieved in a wide pH range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A method for deeply purifying fluoride ions in water by utilizing a strong basic resin-based neodymium-loaded nanocomposite material, the specific steps are as follows:

[0051] (1) Adjust the concentration of fluorine-containing water (F(V) to 1 ppm, Cl - , NO 3 - , SO 4 2- , PO 4 3- The pH value of 100 ppm) was adjusted to 7.0, filtered to obtain a filtrate;

[0052] (2) 50 mL (about 30 grams) of strongly basic anion resin D-201 was used as the parent material and the surface was loaded with 23% nanometer neodymium hydroxide (calculated as Nd) composite material into a jacketed glass adsorption column (Φ32 ×360 mm), at 25±5℃, the filtrate obtained in step (1) was passed through an adsorption column containing a bed of strongly basic resin-based neodymium-loaded nanocomposite material at a flow rate of 15 BV / h, and the treatment capacity was >4000 BV , the concentration of effluent F(V) is reduced to below 10 ppb;

[0053] (3) Stop the adsorption when the adsor...

Embodiment 2

[0055] In Example 2, the method of deeply purifying fluoride ions in water was repeated in Example 1, except that "the temperature of adsorption in step (2) in Example 2 was controlled at 10 ± 2 °C", and the remaining steps were repeated in Example 1, and its adsorption The effect and the amount of processing are basically the same.

Embodiment 3

[0057] In Example 3, the method of deeply purifying fluoride ions in water was repeated in Example 1, except that "the temperature of adsorption in step (2) in Example 3 was controlled at 40 ± 2 °C", and the remaining steps were repeated in Example 1, and its adsorption The effect and the amount of processing are basically the same.

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Abstract

The invention discloses a method for deeply purifying fluoride ions in water by using a strongly alkaline resin-based neodymium-loaded nanocomposite material. After the adsorption tower of the neodymium nanocomposite material, a deeply purified water body is obtained; the strong basic resin-based neodymium-loaded nanocomposite material is a macroporous strong basic anion resin as a matrix, and the matrix is ​​immobilized with neodymium hydroxide nanoparticles as the active ingredient. When the adsorption leak point is reached, it is first eluted with NaOH solution, then rinsed with NaCl solution to convert residual hydroxide into chloride ions, and finally rinsed with water to neutralize to achieve regeneration. In the present invention, polystyrene-divinylbenzene is used as the skeleton to support the neodymium resin as the adsorption material to adsorb fluoride ions in the water body. When the pH of the water body is 3.0 to 10.0, a high concentration of Cl coexists ‑ , NO 3 ‑ , SO 4 2‑ , PO 4 3‑ In the case of effluent, the fluoride ion content (in terms of F) of the effluent can still be reduced from 0.05-20 mg / L to below 0.01 mg / L.

Description

technical field [0001] The invention relates to the technical field of sewage treatment and tap water treatment, in particular to a method for deeply purifying fluoride ions in water by using a strong basic resin-based neodymium-loaded nanocomposite material. Background technique [0002] As a natural element, fluorine is mainly exposed to the human body through drinking water and food. Excessive intake of fluoride by the human body can cause diseases such as dental fluorosis and bone fluorosis, which seriously affects human health. Therefore, my country strictly limits the mass concentration of fluoride ions in water bodies, and the concentration of fluoride ions in drinking water should not exceed 1.0 mg / L, and the maximum allowable mass concentration of industrial wastewater is 10 mg / L. Therefore, the research on defluorination technology has always been a hot topic in the field of environmental protection at home and abroad. [0003] The traditional fluorine treatment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30B01J41/08C02F1/42C02F101/14C02F101/36
CPCB01J20/06B01J20/265B01J41/08C02F1/42C02F2001/422C02F2101/14C02F2101/36
Inventor 潘丙军刘晓晗洪晨璐俞卉陈都洪鉴珩
Owner ZHEJIANG UNIV OF TECH
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