Preparation method of magnetic chitosan-based adsorbent

A chitosan and adsorbent technology, which is applied in the field of water treatment material preparation, can solve problems such as reduced adsorption performance, and achieve the effects of reducing adsorption cost, good performance and improving grafting rate.

Inactive Publication Date: 2018-12-07
CHONGQING UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0005] For the above-mentioned deficiencies that exist in the prior art, the purpose of the invention is to provide a kind of preparation method of magnetic chitosan-based adsorbent, utilize the abundant polymethacryloyloxyethyltrimethylammonium chloride contained on the strong cationic electrolyte The quaternary ammonium salt group is used to modify magnetic chitosan to solve the problem of reduced adsorption performance after chitosan is loaded with magnetic substances and cross-linked.

Method used

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  • Preparation method of magnetic chitosan-based adsorbent
  • Preparation method of magnetic chitosan-based adsorbent
  • Preparation method of magnetic chitosan-based adsorbent

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Embodiment 1

[0032] The preparation method of the present embodiment magnetic chitosan-based adsorbent comprises the steps:

[0033] 1) Fe 3 o 4 - Chitosan particles

[0034] Dissolve 3g of chitosan powder in 20mL of 1% acetic acid solution. Then, 2g Fe 3 o 4 Nanoparticles were added into 5mL distilled water and sonicated for 30 minutes, and its suspension was further mixed with chitosan solution and stirred for 12 hours. Add 200mL cyclohexane and 4mL Span 80 into the three-necked flask, mix and stir for about 1h until the mixture turns into a paste. Chitosan-Fe 3 o 4 The suspension was slowly added to the mixed solution in the three-necked flask to react for 12 hours under vigorous stirring. Then 50% glutaraldehyde (mass 0.93 g) was added into the suspension in the three-necked flask and stirred at 60° C. for 45 min. Under the action of an external magnetic field, the Fe 3 o 4 - Chitosan particles were separated, washed three times with distilled water, and dried under vacuum a...

Embodiment 2

[0065] The difference between the preparation method and the embodiment 1 of the preparation method of the magnetic chitosan-based adsorbent prepared by the present embodiment is: in the step 2), the initiator is the ammonium persulfate of 0.05g / mL, and the add-on is 5mL, methacryloyloxyethyl The add-on of trimethylammonium chloride is 45mL, and other conditions are identical with embodiment 1. After testing, the average degree of grafting of the magnetic chitosan-based adsorbent prepared in this embodiment is 122%.

Embodiment 3

[0067] The difference between the preparation method and Example 1 of the magnetic chitosan-based adsorbent prepared by the present embodiment is: step 2) Initiator is V50 of 0.05g / mL, the addition is 5mL, methacryloyloxyethyltrimethyl The add-on of ammonium chloride is 36mL, and other conditions are identical with embodiment 1. After testing, the average degree of grafting of the magnetic chitosan-based adsorbent prepared in this embodiment is 125%.

[0068] After testing, the adsorbents prepared in Example 2 and Example 3 have good adsorption effects on anionic dye wastewater and heavy metal Cr ion wastewater.

[0069] The assay method of average degree of grafting in the present embodiment is: accurately take by weighing 100mg dry magnetic chitosan-based adsorbent and 200mg acetic acid, dissolve and settle to 100mL with distilled water. Add a certain amount of excessive 0.01mol / L AgNO 3 Standard solution, plus 5mL dibutyl phthalate and 0.16g indicator NH 4 Fe(SO 4 ) 2 ...

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Abstract

The invention discloses a preparation method of a magnetic chitosan-based adsorbent. The preparation method comprises the following steps of: uniformly dispersing Fe3O4-chitosan particles in water, adding an initiator under the atmosphere of nitrogen, then adding methacryloyloxyethyl trimethyl ammonium chloride, uniformly mixing, reacting at the temperature of 70-80 DEG C for 7-9h, washing and drying to obtain the magnetic chitosan-based adsorbent. The magnetic chitosan-based adsorbent prepared by the method not only can adsorb various anionic dyes in sewage, but also can remove heavy metal ions in the sewage, has large adsorption capacity and fast adsorption rate, and is a magnetism adsorbent having more functions and good performance. After the magnetic chitosan-based adsorbent completesadsorption, the magnetic chitosan-based adsorbent can be quickly separated and recovered under the action of an applied magnetic field; and the regeneration of the recovered adsorbent can be realizedin an alkaline solution, so that the adsorbent can be recycled, and the adsorption cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of preparation of water treatment materials, in particular to a preparation method of a magnetic chitosan-based adsorbent. Background technique [0002] Water resources are an important natural resource on the earth. Industries such as coal, metallurgy, gas, papermaking and textiles have caused serious water pollution to a certain extent. Among the many toxic components in industrial wastewater, dyes and heavy metals are the most toxic pollutants in wastewater. These pollutants are not only difficult to biodegrade, but also enrich in the food chain, leading to long-term environmental and biological pollution, which seriously threatens human beings. and animal and plant health. In order to remove these pollutants in water, many water treatment technologies such as adsorption, precipitation, ion exchange, reverse osmosis and membrane technology have emerged as the times require. Among these methods, the adsorption met...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/48C02F101/20C02F101/30
CPCB01J20/06B01J20/24B01J20/28009B01J20/28016C02F1/281C02F1/286C02F1/488C02F2101/20C02F2101/308C02F2303/16
Inventor 郑怀礼王永娟孙强向文英陈新安延严郑超凡
Owner CHONGQING UNIV
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