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Liquid phase chemical deposition modified natural zeolite and method for removing fluorine from water

A natural zeolite, chemical deposition technology, applied in chemical instruments and methods, inorganic chemistry, molecular sieves and alkali exchange compounds, etc., can solve the problem that ion exchange reagents cannot fully remove impurities in pores, increase zeolite porosity and specific surface area, zeolite Adsorption performance can not be fully exerted, etc., to achieve the effect of good defluorination effect, high porosity, and high defluorination capacity

Inactive Publication Date: 2013-01-16
TIANJIN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Al is used in the traditional process 3+ 、Zr 4+ , Fe 3+ Ion-exchange modification of natural zeolite by plasma to replace impurity ions in the pores of zeolite, thereby increasing the porosity and specific surface area of ​​zeolite, and obtaining modified zeolite. Although this method has a certain effect on improving the adsorption performance of zeolite, due to The ion exchange reagent cannot fully remove the impurities in the pores, so that the adsorption performance of zeolite cannot be fully exerted
The fluorine removal capacity of zeolite modified by traditional methods is generally below 500mg / Kg in water, which cannot be well applied in production practice. Therefore, it is necessary to improve the traditional ion exchange process
Liquid-phase chemical deposition technology is the process of using the electrostatic interaction between ions in the liquid to deposit ions on the surface of the solid phase to form solid materials. At present, it is mainly used in the preparation of thin film materials, powder materials and some composite materials. Using the principle of liquid-phase chemical deposition Modification of porous materials by nanoparticle deposition has not been reported

Method used

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  • Liquid phase chemical deposition modified natural zeolite and method for removing fluorine from water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh 2.92g NaCl into a beaker, add deionized water and stir until dissolved, then transfer to a 250ml volumetric flask to constant volume to obtain a 0.2mol / L NaCl solution. The solution was transferred to a reagent bottle, and hydrochloric acid was added dropwise to adjust the pH of the solution to 2.

[0023] (2) Weigh ZrOCl 2 ·8H 2 O 16.11g, placed in a beaker, added deionized water and stirred until completely dissolved, transferred to a 250ml volumetric flask to constant volume, to obtain 0.2mol / L of ZrOCl 2 solution, into a reagent bottle.

[0024] (3) Weigh 50 g of natural zeolite, rinse it with tap water for 3 times, and place it in an oven to fully dry it.

[0025] (4) Put the zeolite obtained in (3) into a beaker, add 150ml of 0.2mol / L NaCl solution to make the solid-liquid ratio 1:3, and soak for 12h. Stir from time to time during the soaking process to make the solid-liquid contact fully and the adsorption fully proceed.

[0026] (5) The zeolite ob...

Embodiment 2

[0036] The preparation process steps are the same as in Example 1, except that in (1), 7.31 g of NaCl is weighed to prepare a solution with a concentration of 0.5 mol / L, and the pH is adjusted to 2.5. In the (2), weigh ZrOCl 2 ·8H 2 O 40.3g, prepared into a solution with a concentration of 0.5mol / L. In (3), rinse 4 times with tap water. In (4), 100 ml of 0.5 mol / L NaCl solution was added to make the solid-liquid ratio 1:2, and soaked for 18 hours. Add 0.5mol / L ZrOCl in the (6) 2 Solution 100mL, solid-liquid ratio 1:2, soak for 18h. 1N ammonia water was added to (7), and the pH of the solid-liquid mixture was adjusted to 8.

[0037] Fluoride removal capacity see table 1

Embodiment 3

[0039] The preparation process steps are the same as in Example 1, except that in (1), 14.62 g of NaCl is weighed to prepare a solution with a concentration of 1.0 mol / L, and the pH=3 is adjusted. In the (2), weigh ZrOCl 2 ·8H 2 O 80.6g, prepared into a solution with a concentration of 1.0mol / L. In (4), 67 ml of 1.0 mol / L NaCl solution was added to make the solid-liquid ratio 3:4, and soaked for 24 hours. Add 1.0mol / L ZrOCl in the (6) 2 Solution 67mL, solid-liquid ratio 3:4, soak for 24h. 1N ammonia water was added to (7), and the pH of the solid-liquid mixture was adjusted to 9.

[0040] Fluoride removal capacity see table 1

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Abstract

The invention relates to liquid phase chemical deposition modified natural zeolite and a method for removing fluorine from water. In the invention, a sodium chloride(or zinc chloride)-aluminum sulfate(aluminum chloride or zirconium dichloride oxide) composite system is subjected to ion exchanger first, then natural zeolite is modified by means of liquid phase deposition to form a micelle structure, and finally the modified zeolite with high specific surface area, high porosity and high absorbability is obtained. The fluorine removal capacity of the modified zeolite reaches over 1,000mg / kg, and the modified zeolite has high fluorine removing effect particularly when used for fluorine-containing water at a lower concentration. The modified zeolite has a bright development and use prospect in the field of drinking water purification and fluorine removal and industrial water treatment.

Description

technical field [0001] The invention belongs to the field of environmental materials, and relates to a liquid-phase chemical deposition modified natural zeolite and a method for removing fluorine in water, so as to realize the purpose of removing fluorine ions in water. Background technique [0002] Fluorine is one of the essential trace elements for the human body, but excessive intake will cause great harm to human health. According to my country's drinking water hygiene standards, the fluorine content in drinking water should not exceed 1.0mg / L. In my country, high-fluorine water is widely distributed. According to statistics, there are 77 million people in my country whose drinking water contains excessive fluoride. At present, the methods for removing fluorine at home and abroad mainly include coagulation sedimentation, adsorption, electrocoagulation, electrodialysis, reverse osmosis and ion exchange. One of the most widely used methods is the adsorption method, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/00
Inventor 冯琬评曹培季惠明周玉贵
Owner TIANJIN UNIV
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