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Renewable heavy metal adsorption material with shrimp and crab shells as raw material, and preparation method, regeneration method and application thereof

A technology of adsorption materials and shrimp and crab shells, which is applied in the field of renewable heavy metal adsorption materials and its preparation, can solve the problems of large pollution in the treatment process, high energy consumption, high water consumption, and large loss of nutrients, etc., and achieve simple preparation process, The effect of less pollution in the processing process and low cost of auxiliary materials

Active Publication Date: 2015-12-09
SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chitosan can be obtained from chitin after decalcification, deproteinization, decolorization and deacetylation. After releasing some amino groups, the adsorption effect is enhanced, but the treatment process is polluted and consumes a lot of energy and water.
And if chitosan is applied to the heavy metal adsorption of aquatic animal hydrolyzate, the flocculation of chitosan will cause a large loss of nutrients, and the recovery problem is also difficult to solve, so the promotion and use value is not high

Method used

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  • Renewable heavy metal adsorption material with shrimp and crab shells as raw material, and preparation method, regeneration method and application thereof
  • Renewable heavy metal adsorption material with shrimp and crab shells as raw material, and preparation method, regeneration method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the preparation of adsorption material

[0034] The renewable heavy metal adsorption material of the present invention is prepared by the following steps:

[0035] A. Fresh shrimp shells are first soaked in deionized water for 0.5 hours, rinsed and drained, then soaked in 95% ethanol for 0.5 hours, drained, dried at 55°C, and crushed into 20-80 mesh shell powder ;

[0036] B. Add the shell powder treated in step A into 0.1mol / L hydrochloric acid solution for 0.5 hours at a material-to-liquid ratio of 1:10 (g / ml), soak for 0.5 hours, drain, and then rinse with deionized water until the eluate pH ≥ 6, then drained, centrifuged to remove the water to obtain demineralized shell powder;

[0037] C. Add sodium dihydrogen phosphate-disodium hydrogen phosphate buffer solution with a pH value of 8.0 and a Na ion concentration greater than or equal to 0.04 mol / L to the demineralized shell powder in step C at a material-to-liquid ratio of 1:10 for 0.5 hours, Then ...

Embodiment 2

[0042] Embodiment 2: the preparation of adsorption material

[0043] The renewable heavy metal adsorption material of the present invention is prepared by the following steps:

[0044] A. Sun-dried crab shells, first soak in deionized water for 2 hours, rinse, drain, then soak in 95% ethanol for 2 hours, drain, dry the crab shells at 75°C, and crush them into 20-80 mesh shells pink;

[0045] B. Add the shell powder treated in step A into 0.5mol / L hydrochloric acid solution for 2 hours at a material-to-liquid ratio of 1:10 (g / ml), soak for 2 hours, drain, and rinse with deionized water until the eluate pH ≥ 6, then drained, centrifuged to remove the water to obtain demineralized shell powder;

[0046] C. Add potassium dihydrogen phosphate-sodium hydroxide buffer solution with a pH value of 8.0 and a sum of Na and K ion concentrations greater than or equal to 0.04mol / L to the demineralized shell powder in step B according to a material-to-liquid ratio of 1:10 for soaking , an...

Embodiment 3

[0047] Embodiment 3: the preparation of adsorption material

[0048] The renewable heavy metal adsorption material of the present invention is prepared by the following steps:

[0049] A. Sun-dried shrimp shells, first soak in deionized water for 1 hour, rinse, drain, then soak in 95% ethanol for 1 hour, drain, dry the shrimp shells at 60°C, and crush them into 20-80 mesh shells pink;

[0050] B. Add the shell powder treated in step A into 0.01mol / L hydrochloric acid solution at a solid-liquid ratio of 1:10 (g / ml), soak for 1 hour, drain, and rinse with deionized water until the eluate pH ≥ 6, then drained, centrifuged to remove the water to obtain demineralized shell powder;

[0051] C. Add disodium hydrogen phosphate-citric acid buffer solution with a pH value of 7.5 and a Na ion concentration greater than or equal to 0.04mol / L to the demineralized shell powder of step B according to a material-to-liquid ratio of 1:10 to soak for 1 hour, and then centrifuge , and then rin...

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Abstract

The invention discloses a renewable heavy metal adsorption material with shrimp and crab shells as a raw material, and a preparation method, a regeneration method and an application thereof. The preparation method comprises the following steps: cleaning the shrimp and crab shells, draining, drying, and crushing to obtain shell powder; immersing the shell powder in a hydrochloric acid solution, draining, washing by using deionized water until the pH value of the obtained eluate is not smaller than 6, draining, and centrifuging to remove water in order to obtain inorganic salt removed shell powder; and adding a Na and / or K ion-containing strong base-weak acid buffer solution with the pH value of 7.5-10 to the inorganic salt removed shell powder to immerse the inorganic salt removed shell powder or immersing the inorganic salt removed shell powder in a NaCl-NaOH solution with the pH value of 7.5-10, centrifuging, removing water, flushing by using deionized water until the pH value of the obtained eluate is not greater than 8, centrifuging, and removing water to obtain the adsorption material. The preparation method has the advantages of wide source and naturalness of the raw material, no need of deproteinization or deacetylation treatment, simple process flow, less pollution, and renewable use, and has an adsorption effect on various heavy metal ions in an aqueous solution, various aquatic animal protein hydrolysates and plant extract liquids.

Description

Technical field: [0001] The invention belongs to the technical field of food and Chinese patent medicine processing and environmental water body purification, and specifically relates to a renewable heavy metal adsorption material using shrimp and crab shells as a raw material, a preparation method, a regeneration method and application thereof. Background technique: [0002] With the rapid development of the national economy, mining, metal processing, and improper disposal and landfill of waste containing heavy metals in economically developed coastal areas have significantly increased the levels of heavy metals such as cadmium, lead, copper, and chromium in soil, surface, and underground water. The heavy metal content in drinking water and crops has increased significantly. my country is a world-class producer and consumer of aquatic products. Aquaculture is mainly distributed around big cities, rivers and coastal waters. Due to water pollution, heavy metals in aquatic fis...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30B01J20/34B01D15/00
Inventor 潘剑宇万鹏蔡冰娜陈华李濛晓妍孙恢礼孙小钰孙大儒
Owner SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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