Zirconium-modified composite adsorbent and its preparation method and use

A compound adsorption and modification technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve problems such as narrow pH range, low adsorption capacity of fluorine-removing materials, and small mechanical properties. Good mechanical properties, great popularization and application value, and large adsorption capacity

Inactive Publication Date: 2016-09-28
GUANGDONG PHARMA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluoride removal materials used in the adsorption method currently on the market have problems such as low adsorption capacity, narrow pH application range, and small mechanical properties.

Method used

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  • Zirconium-modified composite adsorbent and its preparation method and use
  • Zirconium-modified composite adsorbent and its preparation method and use
  • Zirconium-modified composite adsorbent and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 The effect of zirconium oxychloride addition on the defluoridation effect of zirconium modified composite adsorbent

[0040] (1) Take 0.60g chitosan, dissolve in 36ml of 5% acetic acid solution, add different amounts of 0.15mol / L zirconium oxychloride solution (2.00, 5.00, 10.00, 15.00, 20.00, 30.00ml), and use 5% ammonia water Adjusted to pH 5.0 and stirred for 60 minutes;

[0041] (2) Add 1.40g artificial zeolite and 0.50g kaolin and continue to stir for 60min, then adjust to pH 7.5 with 5% ammonia water, let stand for 60min, separate out zirconium-chitosan-zeolite-kaolin (Zr-CZK) composite adsorbent, filter , washed, and dried at 70°C for later use.

[0042] Investigate the defluoridation effect of Zr-CZK composite adsorbents prepared with different additions of zirconium oxychloride. figure 1 . Zr(Ⅳ) ions loaded in composite adsorbent and F in water - F - of adsorption. Therefore, the most important factor affecting the defluoridation performance of ...

Embodiment 2

[0043] Example 2 Influence of Chitosan / Zeolite Mass Ratio on Fluoride Removal Effect of Zirconium Modified Composite Adsorbent

[0044] (1) Take different quality chitosan (0.2, 0.4, 0.6, 0.8, 1.0, 1.4g), add 60ml5% acetic acid solution per gram of chitosan, dissolve in 5% acetic acid solution, 0.15mol / L oxygen The zirconium chloride solution add-on is 20ml, and all the other preparation steps are with embodiment 1 (1).

[0045] (2) Add different quality artificial zeolites (1.8, 1.6, 1.4, 1.2, 1.0, 0.6g) and 0.50g kaolin and continue stirring for 60min, and the rest of the preparation steps are the same as in Example 1(2).

[0046] The total mass of fixed chitosan and zeolite is 2.00g, investigate the mass ratio of chitosan / zeolite (0.2 / 1.8,0.4 / 1.6,0.6 / 1.4,0.8 / 1.2,1.0 / 1.0,1.4 / 0.6, i.e. 1: 9, 1:4, 3:7, 2:3, 1:1, 7:3) The influence of the preparation conditions on the defluoridation effect of the composite adsorbent, the results are shown in the attached figure 2 .

[0047]...

Embodiment 3

[0048] Example 3 Effect of pH value on composite adsorbent loading zirconium and fluorine removal effect

[0049] (1) Get 0.60g chitosan, be dissolved in 5% acetic acid solution of 36ml, parallel 5 parts, add 20.00ml of 0.15mol / L zirconium oxychloride solution respectively, the first part does not adjust pH (pH is about 2.0), The rest were adjusted to pH=3.0, 4.0, 5.0, and 6.0 with 5% ammonia water, respectively, and stirred for 60 minutes;

[0050] (2) The preparation steps are the same as in Example 1 (2).

[0051] Investigate the modification reaction of zirconium and chitosan to prepare composite adsorbents at different pH values, and the defluoridation effect of the obtained adsorbents. The results are shown in the attached manual. image 3 .

[0052] Depend on image 3 It can be seen that the pH value has a certain influence on the loading of zirconium on the composite adsorbent. In the range of pH 4-6, the loading effect of zirconium is good and the fluorine removal ...

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Abstract

The invention relates to a zirconium-modified composite adsorbent and its preparation method and use. The preparation method comprises S1, dissolving chitosan, adding zirconium oxychloride into the chitosan, adjusting pH to 4.0-6.0 and carrying out a stirring reaction process for 30-120min, and S2, adding zeolite into the reaction solution, carrying out stirring for 40-180min, adjusting solution pH to 7.0-8.0, and standing the solution for 60-120min to precipitate the zirconium-modified composite adsorbent. The zirconium-modified composite adsorbent has the characteristics of large adsorption capacity and good mechanical properties, does not produce secondary pollution in water sample treatment and has good effects of static defluorination and dynamic defluorination.

Description

technical field [0001] The invention relates to the technical field of composite material synthesis and water treatment, in particular to a zirconium-modified composite adsorbent and its preparation method and application. Background technique [0002] Appropriate amount of fluorine can enhance the firmness of bones and has a certain effect of preventing dental caries. The suitable concentration of fluorine in drinking water is 0.5-1.0mg / L, but excessive intake of fluorine will damage human health. Drinking water is the main way for the human body to absorb fluoride, but high-fluoride water is widely distributed in my country, and excessive fluorine intake is harmful to human health. [0003] The use of fluoride removal technology can effectively solve the problem of excessive fluorine content in drinking water. The existing fluoride removal technologies mainly include adsorption method, electrodialysis method, ion exchange method, membrane treatment technology method and so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/14
CPCB01J20/0211B01J20/165B01J20/265C02F1/285C02F2101/14
Inventor 陈红红李晓华何雪娟陈静娴陈漫霞颜戊利
Owner GUANGDONG PHARMA UNIV
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