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Heavy metal biological adsorbent using eggshell membrane as matrix and preparation method thereof

A biological adsorbent, eggshell membrane technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of inconvenient adsorption operation, soft and perishable, etc., and achieves a wide range of pH values, Rich source, high mechanical strength effect

Active Publication Date: 2010-09-15
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As a biosorbent, poultry eggshell membranes are soft and perishable, which brings great inconvenience to the adsorption operation. Therefore, chemical modification and immobilization of eggshell membranes are used to improve the mechanical properties and chemical stability of eggshell membranes. sex

Method used

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  • Heavy metal biological adsorbent using eggshell membrane as matrix and preparation method thereof
  • Heavy metal biological adsorbent using eggshell membrane as matrix and preparation method thereof
  • Heavy metal biological adsorbent using eggshell membrane as matrix and preparation method thereof

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preparation example Construction

[0034] The invention is a preparation method of a heavy metal biosorbent that uses chitosan to embed eggshell membrane powder, and the specific operation steps are as follows:

[0035] The first step: processing eggshell membrane powder

[0036] After preliminary cleaning, the recovered egg shells are soaked in water for 24 hours (or soaked in 2% dilute hydrochloric acid for 2 hours), separate the shells and membranes, and collect the membranes;

[0037] Dry the collected fresh eggshell membranes in an environment with a pressure of 1 to 20Pa and a temperature of -56 to -40°C for 24 to 48 hours, then use a food processor to mechanically crush them to make dried eggshells with a particle size of 40 to 80 μm film powder, ready to use;

[0038] Freeze-drying equipment is selected from Beijing Detianyou Technology Development Co., Ltd., FD-1PF freeze-drying machine;

[0039] Step 2: Prepare embedding treatment solution

[0040] Add 20g of sodium pyrophosphate and 40g of potassi...

Embodiment 1

[0057] Example 1: Adsorption and desorption of Cd, Co, Cu, Ni, Pb under different pH conditions.

[0058] The first step: processing eggshell membrane powder

[0059] The recovered egg shells are soaked in water for 24 hours after preliminary cleaning, the shells and membranes are separated, and the membranes are collected;

[0060] Freeze-drying equipment is used to freeze-dry fresh eggshell membranes under the conditions of a pressure of 1-20Pa, a freezing temperature of -56-40°C, and a drying time of 24 hours, and then use a food processor to mechanically pulverize them to produce a particle size of 40 ~80μm dried eggshell membrane powder, set aside;

[0061] The freeze-drying apparatus is selected from Beijing Detianyou Technology Development Co., Ltd., FD-1PF freeze-drying machine.

[0062] Step 2: Prepare embedding treatment solution

[0063] Add 20g of sodium pyrophosphate and 40g of potassium oxalate per liter of deionized water, and stir evenly to obtain an embedd...

Embodiment 2

[0095] The first step: processing eggshell membrane powder

[0096] The recovered egg shells, after preliminary cleaning, are soaked in 2% dilute hydrochloric acid for 2 hours, the shells and membranes are separated, and the membranes are collected;

[0097] Freeze-dry fresh eggshell membranes under the following conditions: pressure 1-20Pa, freezing temperature -56-40°C, drying time 48h, and then use a food processor to mechanically pulverize it to make a particle size of 40-80μm. Dried eggshell membrane powder, set aside.

[0098] Step 2: Prepare embedding treatment solution

[0099] Add 20 g of sodium pyrophosphate and 40 g of sodium oxalate per liter of deionized water, and stir evenly to prepare an embedding treatment solution.

[0100] The third step: preparation of chitosan glue

[0101] Add 30 g, 200 mesh, and 86.9% deacetylation degree chitosan into every liter of 1% acetic acid solution, stir evenly to prepare chitosan glue.

[0102] Step Four: Preparation of Emb...

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Abstract

The invention discloses a heavy metal biological adsorbent using an eggshell membrane as a matrix and a preparation method thereof. The heavy metal biological adsorbent adopts chitosan as an immobilized carrier and eggshell membrane powder as a basis material, and comprises the following components in part by weight: 10 to 13 parts of the eggshell membrane powder, 20 to 30 parts of the chitosan of which the deacetylation degree is 86.9 percent, and a minute amount of gelatinous substance of a complex which contains sodium and potassium and is formed in the preparation process. The particle size of the biological adsorbent is 2 to 3 millimeters. The method comprises the steps of performing vacuum freeze drying and mechanical disintegration on a fresh eggshell membrane (a fibrous membrane between an eggshell and egg white), and then embedding the eggshell membrane with chitosan glue solution to obtain the biological adsorbent for adsorbing heavy metals. The biological adsorbent can be used for treating waste water containing the heavy metals of nickel, cobalt, cadmium, copper, lead and the like of which the concentration is lower than 100 mg / L, and the adsorption rate achieves 42 to 98 percent.

Description

technical field [0001] The invention belongs to the field of biosorbents, and relates to a method for preparing a biosorbent for absorbing heavy metals by using chitosan to embed eggshell membrane powder. The biosorbent uses poultry eggshell membrane (fibrous film between eggshell and protein) as the main raw material, and is suitable for treating wastewater containing heavy metals such as nickel, cobalt, cadmium, copper and lead with a concentration below 100mg / L. Background technique [0002] Due to the great harm of heavy metal wastewater to the natural environment, the treatment of this kind of wastewater is generally attached great importance at home and abroad, and a variety of treatment technologies have been developed. Through its treatment, poisonous to non-toxic, harmful to harmless, and the precious metals in it are recovered, and the purified wastewater is recycled to eliminate and reduce the discharge of heavy metals. With the rapid development of electroplatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 范文宏李志超魏中宝张磊王永建
Owner BEIHANG UNIV
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