Mycelium surface coated biologic adsorbent and preparing process thereof

A biosorbent and surface coating technology, which is applied in chemical instruments and methods, biological water/sewage treatment, adsorbed water/sewage treatment, etc. The effect of cost, low cost and large adsorption capacity

Inactive Publication Date: 2003-03-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan and its derivatives are expensive due to the complex preparation process, which limits the popularization and application in industrial water treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]Dissolve 0.5g of glucan in 10ml, 0.5M aqueous acetic acid solution, add 0.5g of citric acid mycelia, crush and sieve the mycelium to obtain mycelium with a particle size of ≤0.5mm, and coat it with a fluidized bed , the operating gas velocity is 20m / s, and the coating time is 6h. Add 5ml of epichlorohydrin as a cross-linking agent, the cross-linking temperature is 40°C, and the cross-linking time is 24 hours. After filtering and washing with deionized water until neutral, add 25ml, 0.5% NaOH as a curing agent, after curing for 1 hour, filter and wash with deionized water until neutral, and dry to obtain a dry resin that is the surface-coated biosorbent. Take 0.15g dry resin and 50ml Ni 2 SO 4 The aqueous solution was added in a 150ml Erlenmeyer flask, and at room temperature, after shaking at a speed of 150dyn / m for 24 hours (adsorption equilibrium), the metal ion Ni in the solution was measured. 2+ The adsorption capacity is 55mg / g. The experimental results show tha...

Embodiment 4

[0024] Take chitosan 0.5g, dissolve in 30ml, 0.2M nitric acid aqueous solution, add 3ml, 2000mg / l Ni 2 SO 4 Aqueous solution, after the chitosan is dissolved, add 10g of pulverized citric acid mycelium, mycelium particle size ≤ 0.25mm, cover with a fluidized bed, the operating gas velocity is 20m / s, and the coating time is 12h. 5ml of ethylene glycol bisglycidyl glycidyl ether was added dropwise, the crosslinking temperature was 20°C, and the crosslinking time was 12 hours. Filter and wash with deionized water until neutral, add 200ml NaOH as a curing agent, the curing concentration is 1% (w / w), after curing for 6 hours, filter and wash with deionized water until neutral, add 200ml 0.1M hydrochloric acid for desorption agent, desorption time is 6 hours, filter and wash with deionized water until neutral, add 1M 200ml NaOH as regenerant, regenerate for 10 minutes, filter and wash with deionized water until neutral, dry, and the obtained dry resin is the surface Coat the impri...

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PUM

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Abstract

A bioadsorbent for treating the sewage containing heavy metal ions (5-2000 ppm) and with 2-11 of pH value is prepared by coating method and blotting method to coat the surface of mycelia (citrobacteria, yeast, etc) with the glucosan, chitosan, or chitosan derivative. Its advantages are low cost, high adsorption capacity (30-100 mg/g) and cyclic use (20 times).

Description

technical field [0001] The invention relates to a biosorbent with a coating layer outside the mycelium and a preparation method thereof. The mycelium is citric acid bacteria, yeast, penicillium or fungus, and the material of the coating layer is cross-linked dextran, Chitosan or chitosan derivatives. The biosorbent is used for treating wastewater containing heavy metal ions. Background technique [0002] There are a variety of heavy metal ions in electroplating wastewater, dye wastewater, tannery wastewater, and metallurgical wastewater. The pollution of these wastewaters has been paid more and more attention. At present, the commonly used treatment methods for this type of wastewater containing various heavy metal ions include chemical treatment, ion exchange, adsorption separation, membrane separation, and microbial methods. These methods are more effective in treating solutions containing high concentrations of heavy metal ions. Good, but there are certain defects when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62C02F3/34
Inventor 谭天伟苏海佳王智星
Owner BEIJING UNIV OF CHEM TECH
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