Preparation method of tannic acid curing chitosan microsphere heavy metal ion adsorbent

A technology of chitosan microspheres and heavy metal ions, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of less repeated use of adsorbents and unsatisfactory recovery of adsorbent performance, and achieve desorption Easy, excellent performance, large adsorption effect

Inactive Publication Date: 2011-03-30
付华峰
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Problems solved by technology

The cost of the adsorbent is an important factor limiting the use of the adsorbent. In addition, when the modified chitosan is applied to the treatment of heavy metal wastewater, the recovery of the adsorbent performance is not satisfactory, and the repeated use of the adsorbent is less

Method used

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  • Preparation method of tannic acid curing chitosan microsphere heavy metal ion adsorbent

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Embodiment

[0017] Weigh 5g of chitosan and dissolve it in 120mL of 3% acetic acid aqueous solution by mass fraction, add 0.7g of PEG and stir to make it fully dissolved, then add 150mL of liquid paraffin and 2mL of emulsifier and continue to stir to make the system uniform. Add 25mL formaldehyde and react for 3h. The mixture was poured into a large amount of ethanol and NaOH (10%wt%) mixed solution with a volume ratio of 1:1. Suction filtration after stirring, repeated washing until neutral, to obtain wet state chitosan microspheres. Weigh 7 g of tannic acid in 100 mL of distilled water, adjust the pH to 7 to make it a clear solution, add 10 g of wet chitosan microspheres that have not been cross-linked by epichlorohydrin, and react in a water bath at 50 ° C for 6 h. Filter and rinse with distilled water. Put the product into 300 mL of epichlorohydrin with a concentration of 0.06 mol / L, adjust the pH to 10, react at room temperature for 1 h, and react in a water bath at 50° C. for 4 h....

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Abstract

The invention relates to a preparation method of a tannic acid curing chitosan microsphere heavy metal ion adsorbent, comprising the following steps of dissolving chitosan into an acetate aqueous solution, adding PEG (Polyethylene Glycol), stirring, completely dissolving, and then adding liquid paraffin, an emulsifier and a pore-forming agent for reaction; pouring into a mixed solution of ethanol and a sodium hydroxide aqueous solution to prepare a wet type chitosan microsphere; preparing an epichlorohydrin crosslinking wet type chitosan microsphere; and arranging the obtained product into an acid solution, stirring overnight, filtering, neutralizing the microsphere by using an aqueous alkali, and washing with water to reach a neutral state to obtain the chitosan curing tannin microsphere. The adsorbent prepared by the invention can rapidly adsorb heavy metal ions from the aqueous solution, is easy to desorb, can be recycled more than 150 times, has the advantages of long service life up to 4 months, low cost and excellent performance.

Description

(1) Technical field [0001] The invention relates to a preparation method of a tannic acid solidified chitosan microsphere heavy metal ion adsorbent. (2) Background technology [0002] Chitosan is also known as chitin, aminopolysaccharide, chitosan, etc., and its chemical name is β-(1→4)-2-amino-2-deoxy-D-glucose, which is the hydrolysis and removal of chitin under alkaline conditions. Derivatives generated after partial acetyl groups. In nature, the annual biosynthesis of chitin is about 10 billion tons. It 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 chitosan is quite abundant. The coordination between chitosan and its derivatives and metal ions is mainly due to the presence of a large number of functional groups such as hydroxyl and amino groups in the molecular chain, which can form cage-like molecules with a similar network structure by means o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30
Inventor 付华峰王丽娜向天成徐运卿陈秋霞
Owner 付华峰
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