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Method for preparing defluorination with chitosan

A technology for removing fluorine and chitosan, which is applied in the field of preparing fluoride, can solve the problems of difficult to restore activity, complicated process of fluoride, etc., and achieves fast fluoride removal, easy recovery of performance, and high fluoride removal efficiency. Effect

Inactive Publication Date: 2008-08-20
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another purpose of the invention is to overcome the shortcomings of the traditional fluoride removal process, which is complex and difficult to restore activity, and to provide a quick and easy method for restoring activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Use chemically pure neodymium nitrate and double distilled water to prepare 100mL of neodymium nitrate solution, and make the concentration of neodymium ions 0.05mol / L, add chitosan 2g to the neodymium nitrate solution, stir and react on a magnetic stirrer for 6h, filter with medium-speed qualitative filter paper , washed with double distilled water for 5 times to obtain the granular crude product of the defluoridation agent.

[0016] Dry the above-mentioned crude defluorinating agent in an oven at 70°C, and pulverize to obtain a refined defluorinating agent, usually passing through a 60-mesh sieve is the best. The concentration used for adsorption treatment is when the concentration of the fluoride ion solution being treated is 20mg·L -1 , the temperature is 50°C, the pH value is 6.5 and the stirring speed of the stirrer is 300r·min -1 , reaching saturation after 20 min of adsorption. Use 1.2g·L -1 When the adsorbent is used, the fluoride ion removal rate reaches 92...

Embodiment 2

[0019] Use chemically pure neodymium nitrate and double-distilled water to prepare 50 mL of neodymium nitrate solution, and make the concentration of neodymium ions 0.9 mol / L, add 1 g of chitosan to the neodymium nitrate solution, stir and react on a magnetic stirrer for 10 hours, and filter with medium-speed qualitative filter paper , washed with double distilled water 8 times to obtain the granular crude product of the fluoride removal agent.

[0020] Dry the above-mentioned crude defluorinating agent in an oven at 70° C., and pulverize it to obtain a refined defluorinating agent. When the concentration of the treated fluoride ion solution is 20mg·L -1 , the temperature is 55°C, the pH value is 7.5 and the stirring speed of the stirrer is 600r·min -1 , reaching saturation after 20 min of adsorption. Using 1.4g·L -1 When using adsorbent, the removal rate of fluoride ion reaches 97.59%.

[0021] For the defluorinating agent after the adsorption reaches saturation, such as ...

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PUM

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Abstract

The invention relates to a preparing method of defluorinating agent by use of chitosan, which comprises the following steps: first, chemical pure neodymium nitrate and double distilled water are utilized to prepare neodymium nitrate solution, and technically the concentration of the neodymium ion should be kept between 0.05 to 1 mol / L; second, according to the weight / volume ratio of 1 to 50 between chitosan and neodymium nitrate solution, the chelation reaction is conducted for at least 6 hours; then the solution is filtrated by a medium speed qualitative filter paper, and subsequently rinsed by the double distilled water for multiple times, next, the precipitate after filtering is granular crude product of the defluorinating agent; finally, the crude product is further dried in a baking oven at 70 DEG C and then crushed into powders, thus obtaining the finished product of the defluorinating agent. The defluorinating agent in the invention has the advantages of good defluorinating speed, low costs, no pollution, easy recoverability of the performance of the defluorinating agent, simple preparation process, short production cycle, and full utilization of the wastes produced during the processing of marine products.

Description

technical field [0001] The invention relates to a method for preparing a fluorine-removing agent by using chitosan as a raw material. Background technique [0002] In recent years, international advanced water treatment agents are tending to develop in the direction of high-efficiency, pollution-free, multi-functional, and compound green industries. Chitosan is a derivative of chitin hydrolyzed under alkaline conditions and part of the acetyl group is removed. It is also known as chitin, aminopolysaccharide, chitosan, etc., and its chemical name is β-(1→4)-2-amino -2-Deoxy-D Glucose. In nature, the annual biosynthesis of chitin is about 10 billion tons, and it is widely found in the shells of crustaceans such as shrimps and crabs, and is discarded as waste in the process of seafood processing. Chitin is the second largest organic resource on the earth except cellulose, and it is a huge treasure house of resources fully utilized by human beings. Therefore, the source of ch...

Claims

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Application Information

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IPC IPC(8): B01J20/30C02F1/28C02F1/58C02F101/14
Inventor 孟范平姚瑞华李桂芳
Owner OCEAN UNIV OF CHINA