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Preparation and application of lignin or aminolignin-modified magnetic nano-adsorbent

A magnetic nano- and nano-adsorption technology, which is applied in the direction of adsorption of water/sewage treatment, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of low saturated adsorption capacity and difficult separation, and achieve high saturated adsorption capacity, Effect of high magnetic response and cost reduction

Inactive Publication Date: 2018-07-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the developed lignin-based dye adsorbents have low saturated adsorption capacity and are difficult to separate from water.

Method used

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  • Preparation and application of lignin or aminolignin-modified magnetic nano-adsorbent
  • Preparation and application of lignin or aminolignin-modified magnetic nano-adsorbent

Examples

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preparation example Construction

[0034] In order to achieve the above purpose, the present invention provides a novel lignin and its amine derivatives modified on Fe 3 o 4 A green synthesis method on the surface of nanoparticles, and using the synthesized magnetic nano-adsorbent for the adsorption treatment of dyes in water pollution, the preferred preparation method is as follows:

[0035] (1) Take FeCl 3 ·6H 2 O and FeCl 2 4H 2 Dissolve O in deionized water, pass nitrogen protection into the reaction vessel, stir mechanically and heat in a water bath at 50-75°C for 0.1-2h;

[0036] (2) Dissolving lignin or amino lignin in 5%wt ammonia water, drop by drop into the reaction system;

[0037] (3) Add 5% ammonia water drop by drop, control the pH of the system at 9-12, and continue the reaction for 2 hours;

[0038] (4) After the reaction is finished, cool at room temperature, separate by magnetic attraction to obtain a solid product, wash 3 times with deionized water, and dry in a freeze dryer to obtain t...

Embodiment 1

[0043] A kind of synthetic method of lignin modified magnetic nano-adsorbent, the steps are as follows:

[0044] (1) Take 5g of FeCl 3 ·6H 2 O and 2g FeCl 2 4H 2 O was dissolved in 1000ml of deionized water, nitrogen protection was introduced into the reaction vessel, mechanically stirred and heated in a water bath at 65°C.

[0045] (2) Dissolve 2g of lignin or amino lignin in 100ml of 5wt% ammonia water, and drop into the reaction system drop by drop.

[0046] (3) Add 5% ammonia water drop by drop, control the pH of the system at 9-12, and continue the reaction for 2 hours.

[0047] (4) After the reaction is finished, cool at room temperature, separate by magnetic attraction to obtain a solid product, wash 3 times with deionized water, and dry in a freeze dryer to obtain the product.

Embodiment 2

[0049] A kind of synthetic method of lignin modified magnetic nano-adsorbent, the steps are as follows:

[0050] (1) Take 5g of FeCl 3 ·6H 2 O and 2g FeCl 2 4H 2 O was dissolved in 1000ml of deionized water, nitrogen protection was introduced into the reaction vessel, mechanically stirred and heated in a water bath at 70°C.

[0051] (2) Dissolve 1 g of lignin or amino lignin in 100 ml of pH=13 NaOH aqueous solution, and drop into the reaction system drop by drop.

[0052] (3) Then add pH=13 NaOH aqueous solution drop by drop, control the pH of the system at 9-12, and continue the reaction for 2 hours.

[0053] (4) After the reaction is finished, cool at room temperature, separate by magnetic attraction to obtain a solid product, wash 3 times with deionized water, and dry in a freeze dryer to obtain the product.

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Abstract

The invention relates to preparation and application of a lignin or an aminolignin-modified magnetic nano-adsorbent. The magnetic nano-adsorbent is obtained by a one-step conversion of lignin and a raw material iron salt by a modified chemical coprecipitation method. The main method is to prepare surface-modified magnetic nanoparticles by dissolving lignin or amino-modified lignin in an alkaline precipitant and using the alkaline precipitant for coprecipitation. The synthesized magnetic nano-adsorbent has adsorption capacity for both anionic dyes and cationic dyes. Compared with other lignin-based adsorbents, the adsorption capacity is increased by about 2 to 5 times. At the same time, desorption can be achieved by adjusting of the pH, so that the adsorbent is recycled, and the dyes can berecovered. Lignin raw materials used in the adsorbent are industrial and agricultural waste materials, the materials are rich and low in price, the synthesis method is simple and efficient, and the adsorbent is economical and environmentally friendly, and has good application prospects.

Description

technical field [0001] The invention belongs to a method for preparing a novel magnetic nano-adsorbent. The novel magnetic nano-adsorbent prepared by the invention can be widely used in the adsorption and separation of dyes and heavy metal ions in waste water treatment, and relates to the fields of environmental treatment and resource and energy utilization. Background technique [0002] With the rapid development of industrial production and human society, the problem of water pollution has become increasingly serious. A large amount of industrial wastewater is discharged into the natural water system, causing a large amount of pollutants to enter the environmental water body, resulting in the pollution of the natural water body. The water-soluble dye contained in it has been shown by research to have long-term biological toxicity, carcinogenicity and mutagenicity, thus endangering human health and ecological safety. [0003] Lignin is derived from the xylem of plants and ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/66C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J20/24C02F1/286C02F1/66C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2101/40
Inventor 何林何友益李鑫钢隋红
Owner TIANJIN UNIV
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