Preparation method of gold absorbent based on waste eggshell membrane biomaterial

A technology of biological materials and biomass materials, applied in the field of resource recovery, can solve problems such as optimization of the adsorption capacity of egg membrane adsorbents, failure to describe the adsorption behavior of precious metal gold, and unsatisfactory adsorbents, so as to achieve controllable product particle size and facilitate sustainable The effect of continuous growth, volume and uniformity improvement

Active Publication Date: 2013-07-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method fundamentally uses the inherent chemical properties of the egg membrane itself, and does not optimize the adsorption capacity of the egg membrane adsorbent in a real sense, and the adsorbent is used to adsorb heav

Method used

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  • Preparation method of gold absorbent based on waste eggshell membrane biomaterial
  • Preparation method of gold absorbent based on waste eggshell membrane biomaterial
  • Preparation method of gold absorbent based on waste eggshell membrane biomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Acidic pretreatment: The raw materials used are poultry eggshells, glacial acetic acid with a concentration of 99%, and deionized water. First, wash the poultry eggshells and dry them at 40°C, then prepare an acetic acid solution with a concentration of 10%, and control the solid-liquid ratio to 1:2. Mix and react for 2 hours. In order to prevent the egg shell from floating out of the liquid surface and affect the reaction, regular stirring is required during the reaction process. Finally, the egg membrane is taken out, washed with deionized water and dried at 50°C.

[0039] (2) Strong alkali hydrolysis: first prepare a NaOH solution with a concentration of 7%, mix the dried egg film obtained in (1) with NaOH, heat in a 50°C water bath in a reaction vessel, and control the solid-to-liquid ratio of the egg film and NaOH solution to 1:80, take out the reaction dish after 10 minutes, and cool to room temperature.

[0040] (3) Solidification and precipitation: Add thio...

Embodiment 2

[0043] (1) Acidic pretreatment: The raw materials used are poultry eggshells, hydrochloric acid with a concentration of 36-38%, and deionized water. First, wash the poultry eggshells and dry them at 40°C, then prepare a hydrochloric acid solution with a concentration of 2%, and control the solid-liquid ratio to 1:10. Mix and react for 4 hours. In order to prevent the egg shell from floating out of the liquid surface and affect the reaction, regular stirring is required during the reaction process. Finally, the egg membrane is taken out, washed with deionized water and dried at 25°C.

[0044] (2) Strong alkali hydrolysis: first prepare a KOH solution with a concentration of 5%, mix the dried egg film obtained in (1) with KOH, heat in a water bath at 80°C in a reaction vessel, and control the solid-to-liquid ratio of the egg film and KOH solution to 1:120, take out the reaction dish after 20 minutes, and cool to room temperature.

[0045] (3) Solidification and precipitation: A...

Embodiment 3

[0048] (1) Acidic pretreatment: The raw materials used are poultry eggshells, concentrated nitric acid with a concentration of 69%, and deionized water. First, wash the poultry eggshells and dry them at 40°C, then prepare an acetic acid solution with a concentration of 5%, and control the solid-liquid ratio to 1:5. Mix and react for 6 hours. In order to prevent the eggshells from floating out of the liquid and affect the reaction, regular stirring is required during the reaction. Finally, the egg membranes are taken out, washed with deionized water and dried at 35°C.

[0049] (2) Strong alkali dissolution: first prepare a NaOH solution with a concentration of 3%, mix the dried egg film obtained in (1) with NaOH, heat in a water bath at 60°C in a reaction vessel, and control the solid-to-liquid ratio of the egg film to NaOH solution to 1:100, take out the reaction dish after 30min, and cool to room temperature.

[0050] (3) Solidification and precipitation: Add urea and formal...

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Abstract

The invention relates to a preparation method of a gold absorbent based on a waste eggshell membrane biomaterial, and belongs to the technical field of resource recycling. Through the acid pretreatment, protein hydrolysis and modified curing of an eggshell, a modified biological protein composite absorbent can be obtained. The cross-linked protein is changed to a water-soluble substance through the hydrolysis of the protein, internal functional groups also can be exposed, the modified curing process is carried out in the water solution, and the reaction uniformity is improved. The prepared absorbent contains a great amount of specific reactive functional groups for adsorbing gold ions, thereby having a special selective adsorption property for the gold ions. The preparation material is sourced from the kitchen waste eggshell, so that no only can the surface of the adsorbent have a plurality of protein groups of the eggshell membrane, but also the functional property of a modifier can be integrated. The raw materials of the absorbent are abundant, the cost is low, the process is simple, and the operating time is short; and moreover, the kitchen waste is used for recycling the gold to treat the waste by utilizing the waste, and a high adsorption property and an excellent practicability can be realized.

Description

technical field [0001] The invention relates to a method for preparing an adsorbent used for gold recovery, which uses biological waste egg film to recover gold, belongs to a green technology for comprehensive waste reuse, and belongs to the technical field of resource recovery. Background technique [0002] With the development of the economy and the progress of the society, people's demand for gold is increasing. However, the reserves of mineral resources in our country are limited and the output is not high, which makes the resources increasingly tense. The rapid development of the electronics industry is accompanied by the continuous generation of electronic waste. The gold content in electronic waste far exceeds the average grade of gold mines. Many developed countries have turned their attention to the inexhaustible "rich mine" of renewable resources. Research data show that, calculated by the gold content per kilogram, the gold content of old household appliances is a...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C22B7/00C22B11/00
CPCY02P10/20
Inventor 聂祚仁席晓丽李小康马立文
Owner BEIJING UNIV OF TECH
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