Method for removing humic acid pollutants in water by magnetic chitosan particle

A technology of chitosan and pollutants, applied in the direction of water pollutants, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the difficulty of solid-liquid separation of adsorbents, reduce the activity of chitosan amine groups, chitosan Resolve problems such as decrease in adsorption capacity, achieve high active amino content, increase HA/N value, and good dispersibility

Inactive Publication Date: 2010-08-18
NANJING UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The current research results show that chitosan adsorbents can effectively remove humic acid in water, but the currently developed chitosan adsorbents mainly form polymers directly through cross-linking reactions or load them on the surface of carriers, often requiring complex cross-linking. reaction, while the cross-linking reaction is mainly through the reaction of the amine group, thus reducing the activity of the chitosan amine group, thereby reducing the adsorption capacity of chitosan
In addition, the solid-liquid separation of the adsorbent after adsorption saturation is difficult, and the recovery process is complicated. Therefore, it is necessary to develop an efficient adsorbent with high adsorption efficiency and rapid separation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 2.7g of FeCl 3 .6H 2 O was added to 80mL of ethylene glycol solution, then 6.6g of sodium acetate was added and stirred evenly, then 0.3g of chitosan was added, after stirring for 0.5h, the mixture was transferred to the reaction kettle, and reacted at high temperature for 8h at 200°C . After the reaction, magnetically separate, wash with deionized water and absolute ethanol for 3 to 4 times, and vacuum-dry at 70° C. for 12 hours to obtain magnetic chitosan.

[0019] The magnetic chitosan adsorbent prepared by this method is a microsphere with a particle size of 200-300nm, an amino group content of 1.29mmol / g, and a BET specific surface area of ​​36.00m 2 / g, more suitable for use as an adsorbent. Magnetic chitosan has a high magnetization intensity of 38.78emu / g, and the adsorbent can be magnetically separated within 2 minutes under the condition of an external magnetic field.

Embodiment 2

[0021] Using the magnetic chitosan particles synthesized in Example 1 as an adsorbent, the slightly polluted water containing humic acid was treated. Adsorption is carried out in a closed container (volume 50mL), the mass ratio of adsorbent to slightly polluted water is 1:2500, pH=6.0~6.5, the initial concentration of humic acid is 10.5mg / L, the adsorption temperature is 25°C, and the adsorption time After 24 hours, the composite particles were magnetically separated after adsorption, and the removal rate of humic acid was 45.79%.

Embodiment 3

[0023] Condition is the same as embodiment 2. The initial concentration of humic acid was 21.0mg / L, and the removal rate of humic acid was 27.24%.

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PUM

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Abstract

The invention discloses a method for removing humic acid pollutant in water by magnetic chitosan particle. Magnetic chitosan particle carries out absorption removal on humic acid pollutant in water under the condition that pH value is 3-8, absorption time is 1-24h, and temperature is 15-45 DEG C. The invention adopts magnetic chitosan particle to absorb and remove humic acid pollutant in water and shows strong absorption performance. Besides, the preparation of absorbing agent of the invention is simple, operation is convenient, cost is low, treatment effect is obvious, reproducibility is good, and rapid magnetic separation can be realized. Thus, the magnetic chitosan particle is used for removing humic acid pollutant in water, and favourable economic and environmental benefits can be obtained.

Description

technical field [0001] The invention belongs to the technical scope of organic-inorganic composite materials and water treatment, and mainly relates to the application of using magnetic chitosan particles to treat micro-polluted water and humic acid pollutants in water source water. Background technique [0002] Humic acid is an important part of dissolved organic matter in natural water, mainly derived from the biodegradation products of animal and plant debris in nature. The existence of humic acid poses a serious threat to the ecosystem and human health. For example, humic acid has a certain complexation effect on toxic organic matter and heavy metal ions in the water body, forming complex pollutants, which leads to an increase in the concentration of pollutants in the water body; During the process of chlorination and disinfection of drinking water, humic acid can react with chlorine disinfectants to produce a variety of disinfection by-products that are carcinogenic, te...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/24C02F101/34
Inventor 许昭怡王家宏郑寿荣万海勤万玉秋邵芸刘景亮赵瑞东刘凤玲李丽媛陈欢
Owner NANJING UNIV
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