Method for removing heavy metals in shellfish enzymatic hydrolysate

An enzymatic hydrolyzate and heavy metal technology, applied in chemical instruments and methods, food science, applications, etc., can solve problems such as the need to improve the adsorption effect, narrow pH range, difficult separation, etc. The effect of strong adsorption capacity

Active Publication Date: 2020-02-25
DALIAN OCEAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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; The combination can only occur in its external structure, and the adsorption effect needs to be improved; (5) The adsorption of chitosan to heavy metals is limited to cadmium, and the adsorption performance of other types of heavy metal ions is poor

Method used

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  • Method for removing heavy metals in shellfish enzymatic hydrolysate

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Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Grind coal gangue to 300 mesh and place it in ash dish, add sodium carbonate to the ash dish, roast for 1 hour at a temperature of 1000° C. and then grind to obtain a pretreated sample. The sodium carbonate and coal gangue powder The mass ratio of the pretreated sample is 1:3. The pretreated sample is oxidized at 300°C for 1h, then added with a hydrochloric acid solution with a mass concentration of 15%, soaked at 50°C for 1h, and the filtrate and filter residue are collected after filtration. Add oxalic acid in, mix well, obtain mixed liquor, described oxalic acid and Fe in the filtrate 3+ The molar ratio is 2:1, wash the filter residue, add sodium hydroxide and grind it evenly, treat it at 600°C for 1h to obtain slag, add deionized water, and let it stand at 50°C for 2h to obtain a mixture. The mass of the sodium hydroxide and filter residue The ratio is 1:1, the molar ratio of deionized water to sodium hydroxide is 30:1, the mixed solution is added to the mix...

Embodiment 2

[0039] Step 1: Grind coal gangue to 350 mesh and place it in a gray dish, add sodium carbonate to the gray dish, roast at 1200°C for 2 hours and then grind to obtain a pretreated sample, the sodium carbonate and coal gangue powder The mass ratio of the pretreated sample is 1:4. The pretreated sample is oxidized at 350°C for 1.2h, then added with a hydrochloric acid solution with a mass concentration of 15%, soaked at 60°C for 1h, and the filtrate and filter residue are collected after filtration. Add oxalic acid in the filtrate, mix homogeneously, obtain mixed solution, described oxalic acid and Fe in the filtrate 3+ The molar ratio is 3:1, wash the filter residue, add sodium hydroxide and grind it evenly, treat it at 650°C for 1h to obtain slag, add deionized water, and let it stand at 50°C for 2h to obtain a mixture. The mass of the sodium hydroxide and filter residue The ratio is 1:1, the molar ratio of deionized water to sodium hydroxide is 30:1, the mixed solution is adde...

Embodiment 3

[0044] Step 1: Grind coal gangue to 400 mesh and place it in a gray dish, add sodium carbonate to the gray dish, roast it at 1100°C for 2 hours and then grind it to obtain a pretreated sample, the sodium carbonate and coal gangue powder The mass ratio of the sample is 1:4. The pretreated sample is oxidized at 350°C for 1.2h, then added with a hydrochloric acid solution with a mass concentration of 15%, soaked at 60°C for 1.5h, and the filtrate and filter residue are collected after filtration. Add oxalic acid in the filtrate, mix homogeneously, obtain mixed solution, described oxalic acid and Fe in the filtrate 3+ The molar ratio is 3:1, wash the filter residue, add sodium hydroxide and grind it evenly, treat it at 650°C for 1h to obtain slag, add deionized water, and let it stand at 50°C for 2h to obtain a mixture. The mass of the sodium hydroxide and filter residue The ratio is 1:1, the molar ratio of deionized water to sodium hydroxide is 30:1, the mixed solution is added t...

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Abstract

The invention discloses a method for removing heavy metals in a shellfish enzymatic hydrolysate, which belongs to the technical field of aquatic product processing, the method comprises the followingsteps: preparing an in-situ iron-doped molecular sieve, then preparing modified chitosan, crosslinking the in-situ iron-doped molecular sieve and the modified chitosan to form a molecular sieve/chitosan compound, and directly adding the molecular sieve/chitosan compound into the shellfish enzymatic hydrolysate without adjusting a pH value of the shellfish enzymatic hydrolysate so that the removalrate of various metal ions is good, and the molecular sieve/chitosan compound is easy to recycle and can be repeatedly utilized.

Description

technical field [0001] The invention relates to the technical field of aquatic product processing, in particular to a method for removing heavy metals in enzymatic hydrolyzate of shellfish. 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] my country is a big shellfish farming country in the world, with annual shellfish output reaching 10 million tons, accounting for 60% of the total output. The output of marine shellfish farming accounts for 80% of the total output of marine aquaculture. Currently, the shellfish products that have reached the scale of production mainly include oysters, clams, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L5/20B01J20/26B01J20/30
CPCA23L5/273B01J20/26B01J20/18A23V2002/00A23V2250/511A23V2250/1592
Inventor 聂鸿涛姜坤银李宁黄金玉闫喜武
Owner DALIAN OCEAN UNIV
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