Chitosan/natural zeolite material for removing fluorine in water

A technology of natural zeolite and chitosan, applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc. Metal residue and other problems, to achieve the effect of large defluorination capacity, stable defluorination effect and good defluorination performance

Inactive Publication Date: 2013-07-10
BEIJING ZHONGDI HONGKE ENVIRONMENT SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, glutaraldehyde (such as chemical cross-linking agent is extremely toxic to cell protein, the cross-linked chitosan microsphere prepared with it is restricted when being used for drinking water defluoridation
Yao Ruihua prepared a new type of defluoridation agent using chitosan / rare earth in 2009, but the rare earth metal residues in the preparation process, the small particle size of the defluorination agent is not conducive to the in-situ defluorination of groundwater, and the high cost limits its application.

Method used

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  • Chitosan/natural zeolite material for removing fluorine in water
  • Chitosan/natural zeolite material for removing fluorine in water
  • Chitosan/natural zeolite material for removing fluorine in water

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specific Embodiment approach

[0029] Chitosan / natural zeolite material for removing fluorine in water of the present invention, its preferred embodiment is:

[0030] The material is particles coated with chitosan on the surface of natural zeolite, wherein the chitosan accounts for 0.1-16.7% of the total mass of the particles, and the average particle diameter of the particles is 1-2mm.

[0031] The chitosan accounts for 0.5-6.55% of the total amount.

[0032] Described chitosan accounts for 6% of total amount.

[0033] The material was prepared by the following steps:

[0034] a. Calcining the screened natural zeolite in a muffle furnace at a temperature of 450-550°C for 1-2 hours, taking it out for later use;

[0035] b. Add glacial acetic acid to the container, add deionized water, and prepare a 0.5-10% glacial acetic acid solution;

[0036] c. At room temperature, add chitosan to the glacial acetic acid solution while stirring, and stir for 5 to 30 minutes to obtain a viscous chitosan solution with a...

Embodiment 1

[0058] In a 50mL glass beaker, add 14mL of glacial acetic acid solution with a concentration of 2.0%, accurately weigh 0.7g of chitosan into the beaker, stir with a glass rod until completely dissolved, then weigh 10g of calcined natural zeolite into the beaker , stirred at room temperature for 15 minutes, transferred to an evaporating dish, dried at 40-105° C., crushed and sieved to obtain chitosan / natural zeolite granular materials with a particle size of 1-2 mm.

[0059] Using this material to treat fluorine-containing water, when the initial fluorine concentration is 2mg / L, the pH value is 6.0 ( figure 1 ), stirring at a speed of 100r / min at room temperature ( image 3 ) adsorption for 50min ( figure 2 ) reaches saturation. When using 0.1g / 250mL adsorbent ( Figure 4 ), the fluorine ion removal rate can reach 61%, and the fluorine concentration in the effluent is 0.78mg / L, which meets the sanitary standard of drinking water. Fluoride removal agent for F - The adsorpt...

Embodiment 2

[0061] First, it is prepared with analytically pure NaF with a purity of 98%. Weigh 2.210g of reference NaF (pre-dried at 105-110°C for 2h, or at 500-650°C for about 40min, and cool in a desiccator), transfer it to a 1000mL volumetric flask, dilute to the marked line, and shake well. Stored in polyethylene bottles, this solution contains fluorine (F - ) 1000 μg. Pipette 2mL, 5mL, and 10mL of the stock solution into 1000mL volumetric flasks respectively, and shake to a constant volume to obtain F with a concentration of 2mg / L, 5mg / L, and 10mg / L. - solution.

[0062] Second, add appropriate amount of sodium chloride and sodium bicarbonate to fluorinated water to prepare Cl - , HCO 3 - Water samples with concentrations of 100, 200, 400, 600, 800 and 1000 mg / L were adjusted to pH 6.0.

[0063] Finally, take 250mL of the above-mentioned anion-containing solution in a 500mL plastic cup, add 0.5g of adsorbent, place it on a six-way mixer, stir at a speed of 100r / min for 50min, ...

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Abstract

The invention discloses a chitosan / natural zeolite material for removing fluorine in water. The chitosan / natural zeolite material is a particle which is prepared by enveloping the surface of the natural zeolite by using the chitosan, wherein the mass of the chitosan is 0.1-16.7% of the total mass of the particle, and the average particle size of the particle is 1-2mm. The preparation method of the chitosan / natural zeolite material comprises the following steps of: firstly calcining the screened natural zeolite in a muffle furnace at the temperature of 450-550 DEG C for 1-2 hours, adding glacial acetic acid into deionized water to prepare the glacial acetic acid solution at the concentration of 0.5-10%, and adding the chitosan and the natural zeolite which is pretreated by calcination into the glacial acetic acid solution while stirring to obtain the chitosan / natural zeolite material. The chitosan / natural zeolite material is fast in fluorine removal speed, large in fluorine removal volume, stable in fluorine removal effect, simple and easy in implementation of the preparation process, easy in storage, low in preparation cost, applicable to the in-site fluorine removal for ground water, and suitable for the fluorine removal for the ground water with high Cl- and HCO3- content.

Description

technical field [0001] The invention relates to a material for removing fluorine in water, in particular to a chitosan / natural zeolite material for removing fluorine in water. Background technique [0002] Fluorine is an essential trace element for the human body. Adequate intake of fluorine can stimulate the activity of osteoblasts and make teeth and bones strong. However, when the fluorine content in the human body exceeds a certain concentration, it will inhibit the activity of osteoblasts, causing bone fluorosis or dental fluorosis. When people drink water with a fluoride content lower than 0.5mg / L for a long time, the precipitation of fluorine in the enamel decreases, resulting in an increase in the incidence of dental caries; Loss of luster, plaque or brown spots on teeth. In my country except Shanghai, high-fluorine water is distributed in almost all provinces, mainly in the northeast, northwest, north China and the Huanghuaihai plain, such as the Yabulai area of ​​...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24C02F1/28C02F1/58
Inventor 张焕祯张国臣陈水飞刘晓宇张泉于晓娟李晓梅马莉宁亚涛李亚静彭丽霞
Owner BEIJING ZHONGDI HONGKE ENVIRONMENT SCI & TECH
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