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Composite biological adsorption and preparing method thereof

A biological adsorbent and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of limited removal range, secondary pollution, etc., and achieve adsorption capacity and High selectivity and cost saving effect

Inactive Publication Date: 2007-11-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, technologies such as adsorption, oxidation, biodegradation and membrane filtration are used to control drinking water pollution and improve water quality. At the same time, there are certain limitations: such as secondary pollution, limited removal range, etc.
However, studies on loading titanium dioxide onto biocarriers such as chitosan have rarely been reported.

Method used

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  • Composite biological adsorption and preparing method thereof
  • Composite biological adsorption and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Take dextran 10g and dissolve it in 10ml, 0.01M hydrochloric acid aqueous solution, and use a fluidized bed to immobilize Fe-doped anatase nano-TiO with an average particle diameter of 50nm 2 0.01g, the operating gas velocity is 20m / s, and the loading time is 12h. Add 0.1ml of glutaraldehyde as a crosslinking agent, the crosslinking temperature is 80°C, and the crosslinking time is 0.5 hours. After filtering and washing with deionized water until neutral, add 200ml, 0.5% sodium tripolyphosphate 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 surface-loaded nano-TiO2 of biosorbents. Take 0.15g dry resin and 50ml Ag 2 NO 3 The aqueous solution was added to a 150ml conical flask, and at room temperature, after shaking at a speed of 150dyn / m for 24 hours (adsorption equilibrium), the metal ion Ag in the solution was measured. + The adsorption capacity is 36mg / g. The experim...

Embodiment 4

[0028] Example 4: Dissolve 2 g of dextran in 10 ml of 0.001 M hydrochloric acid aqueous solution, add 10 g of silica gel with a particle size ≤ 0.5 mm, and coat with a rotating bed at an operating gas velocity of 20 m / s for a coating time of 8 h. Immobilization of Fe-doped Nano TiO in Rotating Bed 2 0.1g, operating gas velocity 200m / s, fixed loading time 2h. Add 20ml of ethylene glycol diglycidyl ether as a cross-linking agent, the cross-linking temperature is 80°C, and the cross-linking time is 1 hour. After filtering and washing with deionized water to neutrality, add 50ml, 10% NaHCO 3 As a curing agent, after curing for 1 hour, filter and wash with deionized water until neutral, and then dry to obtain a dry resin, which is the surface-coated nano-TiO2 biosorbent. Take 0.15g dry resin and 50ml PbNO 3 The aqueous solution was added in a 150ml conical flask, and at room temperature, after shaking at a speed of 150dyn / m for 24 hours (adsorption equilibrium), the metal ion Pb...

Embodiment 7

[0030] Embodiment 7: get grafted carboxymethyl chitosan 5g, be dissolved in the nitric acid aqueous solution of 30ml, 0.01M, after the grafted carboxymethyl chitosan dissolves, add 5ml, the CuSO of 2000mg / l 4 Aqueous solution, blotting for 2 hours, immobilized nanometer 0.1g TiO2 in a fluidized bed, operating gas velocity 0.5m / s, immobilization time 12h; add 10ml glutaraldehyde dropwise, crosslinking temperature 10°C, crosslinking time 10 hours. Filter and wash with deionized water until neutral, add 200ml of sodium tripolyphosphate as a curing agent, the curing concentration is 5% (w / w), after curing for 6 hours, filter and wash with deionized water until neutral, add 25ml of 0.01M Nitric acid is used as a desorbent, the desorption time is 24 hours, the filter is washed with deionized water to neutrality, and 1M 50ml of sodium bicarbonate is added as a regeneration agent, regenerated for 10 minutes, filtered with deionized water, washed to neutrality, and dried to obtain The ...

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Abstract

The present invention relates to one kind of composite biological adsorbent and its preparation process. The adsorbent is chitosan or dextran cross-linked resin with supported titania photocatalyst and surface heavy metal ion blotting, and has the functions of adsorbing heavy metal ion, and degrading and eliminating organic pollutant, pathogen and microbe from water solution. The adsorbent is prepared through cross-linking and supporting titania photocatalyst onto chitosan and other saccharide biomass, coupling molecular engram with nanometer titania photocatalyst to form surface heavy metal ion blotting in the surface. The adsorbent has high adsorption capacity, high heavy metal selectivity, and high capacity of degrading and eliminating organic pollutant, pathogen and microbe.

Description

technical field [0001] The invention relates to a composite biosorbent and a preparation method thereof, in particular to a molecularly imprinted and photocatalyzed multifunctional adsorbent and a preparation method thereof. It is mainly used for the treatment of industrial wastewater and the deep purification of drinking water. The preparation method involves molecular imprinting technology and nano titanium dioxide photocatalytic loading technology. Background technique [0002] At present, the pollution of drinking water in my country mainly refers to the excessive content of harmful substances such as ammonia nitrogen, organic matter and heavy metal ions. With the increasing pollution of water bodies, the pollution of pathogenic microorganisms and heavy metal ions in the effluent after conventional secondary treatment in water plants is also expanding. Traditional treatment processes such as "coagulation-sedimentation-filtration-disinfection" can only remove suspended s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62
Inventor 苏海佳李强谭天伟
Owner BEIJING UNIV OF CHEM TECH
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