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Natural composite adsorbent and preparation method and application thereof

A composite adsorption, natural material technology, applied in the field of natural material composite adsorbent and its preparation, can solve the problems of incapability of large-scale application, low resource utilization rate, low adsorption rate, etc., and achieves easy large-scale industrial production and simple preparation method. , the effect of high mechanical strength

Active Publication Date: 2019-01-04
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The adsorption of heavy metals by traditional biological adsorption materials will reach the corresponding equilibrium stage after a certain period of time, and the adsorption capacity will not increase to adsorption saturation with the increase of time, and the resource utilization rate is low, so the adsorption balance cannot be broken, resulting in low adsorption effect ;
[0006] (2) Low-cost agricultural waste, such as biomass such as straw and leaves, is mostly used. The biosorbent produced has the disadvantage of low mechanical strength. It is difficult to maintain long-term wastewater impact in the suspension system, resulting in losses such as scattering. In a large number of mines In wastewater treatment, chemical precipitation method is still the mainstream application technology, and biological adsorption technology has not been popularized and applied;
[0007] (3) The use of biosorbents such as immobilized cells, microorganisms, and bacteria is expensive and cannot be applied on a large scale. There are problems such as subsequent treatment of organisms that are easy to corrupt, and the potential risks of genetically engineered bacteria are unknown.
However, the metal biosorbent did not solve the problem of low adsorption rate.

Method used

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  • Natural composite adsorbent and preparation method and application thereof
  • Natural composite adsorbent and preparation method and application thereof
  • Natural composite adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Chitosan is first obtained by deacetylating chitin, and then chitosan and light-responsive gelling factor are compounded according to a mass ratio of 15:1 to obtain modified chitin;

[0046] (2) Weigh raw materials according to the following proportions: modified chitin 10g, sodium alginate 40g, acidic wheat straw 15g, rice straw 20g and peanut shell 15g, bentonite 45g and trace element amino acid chelate 10g; The material and bentonite are pulverized and mixed evenly to obtain a premix with an average particle size of 0.1mm;

[0047] (2) Add the trace element amino acid chelate into the ethanol solvent, then add the premix obtained in step (1), stir evenly, dry until the ethanol mixing is completed, and make a spherical adsorbent green body with a diameter of 2mm ;

[0048] (3) The outer surface of the spherical adsorbent green body obtained in step (2) is coated with sodium alginate, and then tempered and roasted at 120 ° C for 8 hours;

[0049] (4) Coating modi...

Embodiment 2

[0051] (1) First deacetylate chitin to obtain chitosan, and then compound chitosan and pH-responsive gelling factor at a mass ratio of 10:1 to obtain modified chitin;

[0052] (2) Weigh the raw materials according to the following ratio: 20g of modified chitin, 40g of sodium alginate, 25g of acidic wheat straw, 30g of rice straw and 25g of peanut shell, 30g of bentonite and 5g of trace element amino acid chelate; The material and bentonite are pulverized and mixed evenly to obtain a premix with an average particle size of 1mm;

[0053] (2) Add the trace element amino acid chelate into the ethanol solvent, then add the premix obtained in step (1), stir evenly, dry until the ethanol mixing is completed, and make a spherical adsorbent green body with a diameter of 10mm ;

[0054] (3) The outer surface of the spherical adsorbent green body obtained in step (2) is coated with sodium alginate, and then tempered and roasted at 180° C. for 5 hours;

[0055] (4) Coating modified chit...

Embodiment 3

[0057] (1) First deacetylate chitin to obtain chitosan, and then compound chitosan and light-responsive gelling factor according to the mass ratio of 20:1 to obtain modified chitin;

[0058] (2) Weigh raw materials according to the following proportions: modified chitin 15g, sodium alginate 30g, acidic wheat straw 20g, rice straw 25g and peanut shell 20g, bentonite 35g and trace element amino acid chelate 8g; The material and bentonite are pulverized and mixed evenly to obtain a premix with an average particle size of 0.8mm;

[0059] (2) Add the trace element amino acid chelate into the ethanol solvent, then add the premix obtained in step (1), stir evenly, dry until the ethanol mixing is completed, and make a spherical adsorbent green body with a diameter of 8mm ;

[0060] (3) The outer surface of the spherical adsorbent green body obtained in step (2) is coated with sodium alginate, and then tempered and roasted at 160° C. for 6 hours;

[0061] (4) Coating modified chitin ...

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Abstract

The invention relates to the technical field of water treatment, provides a natural composite adsorbent and a preparation method and application thereof, and aims to solve the problem that a traditional biological adsorption material is low in mechanical strength and low in heavy metal removal rate. The natural composite adsorbent comprises, by weight, 10-20 parts of modified chitin, 20-40 parts of sodium alginate, 50-80 parts of biomass carbon materials, 30-45 parts of bentonite and 5-10 parts of microelement amino acid chelates. The natural composite adsorbent has the advantages that selected raw materials are green, environment-friendly, low in cost and high in mechanical strength, a gel factor is used to flexibly adjust and control dynamic balance of heavy metal adsorption, and the natural composite adsorbent is enabled to be high in adsorption rate. The preparation method of the natural composite adsorbent is simple, free from special requirements on equipment and easy for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a natural material composite adsorbent and its preparation method and application. Background technique [0002] Heavy metals are a class of toxic substances that cause water pollution. A small amount of heavy metals can produce toxic effects. The harm of heavy metals to human health is multi-faceted and multi-level. Their toxic effects are mainly manifested in reducing human resistance. The food web is absorbed and accumulated by organisms, eventually causing human accumulation and chronic poisoning. Monitoring and prevention of heavy metal pollution in water has always been a hot spot in environmental science research. People continue to develop and improve methods and technologies for treating heavy metal wastewater, resulting in treatment methods such as physical methods, chemical methods, and biochemical methods. [0003] Biosorption is a new potential heavy metal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/12B01J20/20B01J2220/42B01J2220/4806B01J2220/4825C02F1/281C02F2101/20
Inventor 孙静亚冯丽娟陈庆国
Owner ZHEJIANG OCEAN UNIV