Biologic absorbent for adsorbing heavy metal and preparing method thereof

A biological adsorbent, a technology for heavy metal adsorption, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of perishable adsorption operation and inconvenience

Inactive Publication Date: 2008-07-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As a biosorbent, seaweed is soft and perishable, which brings great inconvenience to the adsorption operation. At present, it has become the main factor limiting the practical application of seaweed to adsorb metal ions. Therefore, it is necessary to chemically modify and immobilize seaweed. To improve the mechanical properties and chemical stability of seaweed

Method used

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  • Biologic absorbent for adsorbing heavy metal and preparing method thereof
  • Biologic absorbent for adsorbing heavy metal and preparing method thereof
  • Biologic absorbent for adsorbing heavy metal and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: Ni under experimental conditions 2+ Adsorption

[0055] The first step: processing of kelp powder

[0056] Freeze-dry the fresh kelp for 24 hours, crush it into dry kelp powder with a particle size of 90% of 30 μm by airflow, and set aside; the freeze-drying temperature is -56°C, and the vacuum degree is 15Pa; the freeze-drying equipment is selected from Beijing Detianyou Technology Development Co., Ltd. Company, FD-1 PF Freeze Dryer.

[0057] The second step: embedding treatment solution

[0058] Calcium chloride is dissolved in deionized water, and the embedding treatment solution is prepared by stirring evenly;

[0059] The consumption of described calcium chloride is to add 4.25g in every 100ml deionized water;

[0060] The third step: making sodium alginate and gelatin glue

[0061] put sodium alginate and gelatin into deionized water, and stir evenly at a temperature of 60°C to prepare sodium alginate and gelatin glue;

[0062] The consumption of...

Embodiment 2

[0075] The first step: processing of kelp powder

[0076] Freeze-dry the fresh kelp for 72 hours, crush it into dry kelp powder with a particle size of 0.3-30 μm by airflow, and set aside for use; the freeze-drying temperature is -40°C, and the vacuum degree is 20Pa;

[0077] The second step: embedding treatment solution

[0078] Calcium chloride is dissolved in deionized water, and the embedding treatment solution is prepared by stirring evenly;

[0079] The consumption of described calcium chloride is to add 4g in every 100ml deionized water;

[0080] The third step: making sodium alginate and gelatin glue

[0081] put sodium alginate and gelatin into deionized water, and stir evenly at a temperature of 75°C to prepare sodium alginate and gelatin glue;

[0082] The consumption of described sodium alginate is to add 4g in every 100ml acetic acid;

[0083] The consumption of described gelatin is to add 2g in every 100ml deionized water;

[0084] Step Four: Embedding Body ...

Embodiment 3

[0090] Get the biosorbent sphere prepared by 0.25g embodiment 1, and 100ml concentration is 100mg / L containing Co 2+ , Zn 2+ 、Cd 2+ 、Cu 2+ and Pb 2+ The metal solution was added to an Erlenmeyer flask, adjusted to pH = 7 ± 0.5, oscillating and adsorbing at 25°C for 5 hours to reach adsorption equilibrium, and the Co in the solution after adsorption was measured by inductively coupled plasma emission spectrometry. 2+ , Zn 2+ 、Cd 2+ 、Cu 2+ and Pb 2+ The concentration of ions, the adsorption characteristics of the adsorbent to each metal ion are as follows:

[0091] metals in solution

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Abstract

The invention discloses a biological adsorbent adsorbing heavy metals by embedding kelp powder with sodium alginate and gelatin and a preparation method thereof. The biological adsorbent comprises 80-95 weight percent of kelp powder, 2-10 weight percent of sodium alginate, 2-8 weight percent of gelatin and residual impurity, wherein the impurity is calcium alginate, and the particle size of the biological adsorbent is in 1.5-3 mm. The method obtains the biological adsorbent adsorbing heavy metals by vacuum drying fresh kelp and comminuting the kelp by gas stream and then embedding the kelp with sodium alginate and gelatin liquid. The effluent which has the concentration less than or equal to100 mg / Land contains heavy metals such as nickel, cobalt, zinc, cadmium, copper and lead can be treated by the biological adsorbent, and the adsorption rate can reach 50-99 percent.

Description

technical field [0001] The invention relates to a method for preparing a heavy metal biosorbent by embedding kelp powder with sodium alginate and gelatin. The biosorbent uses kelp as the biosorbent material, sodium alginate and gelatin as immobilized carriers, and is suitable for treating low-concentration (≤100mg / L) wastewater containing heavy metals such as nickel, cobalt, zinc, cadmium, copper and lead. Background technique [0002] With the rapid development of the economy, people are paying more and more attention to the environment. How to eliminate the hazards of heavy metals and effectively recover precious metals in wastewater is a very prominent problem in today's environmental protection work. Traditional heavy metal treatment methods There are mainly chemical precipitation method, electrolysis method, ion exchange method, membrane treatment method and their mixed treatment methods, etc., but these methods have complex processes, cumbersome operations and high ope...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 范文宏许志珍冯丽娟
Owner BEIHANG UNIV
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