Method for removing heavy metal cadmium in shellfish enzymatic hydrolysate

A technology for enzymatic hydrolysis and heavy metals, applied in alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve problems such as difficult separation, poor adsorption effect, narrow pH range, etc., and achieve operational Convenience, cadmium removal effect and high removal efficiency

Active Publication Date: 2019-08-09
MARINE FISHERIES RES INST OF ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following defects in this method: (1) chitosan has poor stability, and it is easy to lose from the solution at low pH, causing the applicable pH range to be narrow (pH is 8); (2) chitosan adsorption capacity is low, The adsorption equilibrium time and removal time are long (6h), and the removal efficiency is low; (3) chitosan is difficult to granulate, the specific gravity is small, and it is not easy to separate from the water body, and the separation is relatively difficult; Binding can only occur in its external structure, and the adsorption effect needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of Fe 3 o 4 magnetic nanoparticles

[0039] FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 Dissolve in deionized water to obtain a mixed solution, FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 The molar ratio is 2:1; add excess ammonia water dropwise to the mixed solution to maintain the pH at 10 to form a black precipitate. Under stirring conditions, heat in a water bath at 80°C for 30 minutes, separate the black precipitate with an external magnetic field, and wash it with deionized water until The pH is neutral and dried in vacuum to obtain Fe 3 o 4 Magnetic nanoparticles, ready to use.

[0040] (2) Preparation of SiO 2 Core-shell magnetic microspheres

[0041] Take 0.4g Fe 3 o 4 After pretreatment, the magnetic nanoparticles were added to the mixed solution of ethanol and water. The mass ratio of ethanol to water in the mixed solution was 4:1. After ultrasonic dispersion, 0.18mL tetraethyl orthosilicate and 0.9mL absolute ethanol were slowly ...

Embodiment 2

[0055] (1) Preparation of Fe 3 o 4 magnetic nanoparticles

[0056] FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 Dissolve in deionized water to obtain a mixed solution, FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 The molar ratio is 2:1; add excess ammonia water dropwise to the mixed solution to maintain the pH at 10 to form a black precipitate. Under stirring conditions, heat in a water bath at 85°C for 25 minutes, separate the black precipitate with an external magnetic field, and wash it with deionized water until The pH is neutral and dried in vacuum to obtain Fe 3 o 4Magnetic nanoparticles, ready to use.

[0057] (2) Preparation of SiO 2 Core-shell magnetic microspheres

[0058] Take 0.5g Fe 3 o 4 After pretreatment, the magnetic nanoparticles were added to the mixed solution of ethanol and water. The mass ratio of ethanol to water in the mixed solution was 5:1. After ultrasonic dispersion, 0.2mL tetraethyl orthosilicate and 1.1mL absolute ethanol were slowly ad...

Embodiment 3

[0072] (1) Preparation of Fe 3 o 4 magnetic nanoparticles

[0073] FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 Dissolve in deionized water to obtain a mixed solution, FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 The molar ratio is 2:1; add excess ammonia water dropwise to the mixed solution to maintain the pH at 10 to form a black precipitate. Under stirring conditions, heat in a water bath at 82°C for 28 minutes, separate the black precipitate with an external magnetic field, and wash it with deionized water until The pH is neutral and dried in vacuum to obtain Fe 3 o 4 Magnetic nanoparticles, ready to use.

[0074] (2) Preparation of SiO 2 Core-shell magnetic microspheres

[0075] Take 0.45g Fe 3 o 4 After pretreatment, the magnetic nanoparticles were added to the mixed solution of ethanol and water. The mass ratio of ethanol to water in the mixed solution was 4.5:1. After ultrasonic dispersion, 0.19mL tetraethyl orthosilicate and 1.0mL absolute ethanol were slow...

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PUM

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Abstract

The invention discloses a method for removing heavy metal cadmium in shellfish enzymatic hydrolysate. The method includes the following steps of firstly, preparing Fe3O4 magnetic nanoparticles; secondly, preparing SiO2 core-shell magnetic microspheres; thirdly, preparing polyaspartic acid modified chitosan; fourthly, preparing composite aerogel; fifthly, processing the shellfish enzymatic hydrolysate; sixthly, removing cadmium. The heavy metal cadmium in the shellfish enzymatic hydrolysate is removed through the composite aerogel in cooperation with ultrasonic adsorption, operation is simple,the method has the advantages that the pH application range is wide, the cadmium removal effect and removal efficiency are high and separation is convenient, and the method has industrialized application prospects.

Description

technical field [0001] The invention relates to the technical field of aquatic product processing, in particular to a method for removing heavy metal cadmium in shellfish enzymatic hydrolysis liquid. Background technique [0002] Marine shellfish enzymatic hydrolyzate contains a large number of amino acids, peptides and other biologically active small molecules, which have unique physiological activities and have special effects in immune regulation, tumor suppression, enzyme inhibition, antibacterial, anti-virus, anti-oxidation, anti-radiation, etc. , Has been widely used in food, health care and cosmetics industries. [0003] However, due to their filter-feeding characteristics, marine shellfish are easily polluted by heavy metals, pesticides, biotoxins, bacteria, viruses, etc. Heavy metal pollution is the most harmful type of shellfish pollution, and cadmium (Cd) is the main heavy metal One of the pollutants, it is very easy to cause the heavy metal cadmium content in sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D15/08B01J20/24B01J20/28B01J20/30
CPCB01D15/08B01J20/24B01J20/103B01J20/28009B01J20/28047B01J20/30B01D2015/389Y02C20/40
Inventor 顾捷陈瑜黄丽英孟春英
Owner MARINE FISHERIES RES INST OF ZHEJIANG
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