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A kind of polysaccharide-polyurethane heavy metal adsorbent and preparation method thereof

A technology of polyurethane and heavy metals, which is applied in the direction of solid adsorbent liquid separation, separation methods, chemical instruments and methods, etc., can solve the problems of instability, easy breakage and dissolution, limited industrial application, small size and difficult separation, etc., so as to facilitate popularization and application , good heavy metal removal effect, stable chemical properties

Active Publication Date: 2019-10-25
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gel beads obtained by this method are still unstable, easily broken and dissolved, small in size, difficult to separate, and unfavorable for recycling, which greatly limits its industrial application.

Method used

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  • A kind of polysaccharide-polyurethane heavy metal adsorbent and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0028] A kind of preparation method of polysaccharide-polyurethane heavy metal adsorbent, concrete steps are as follows:

[0029] 1) Preparation of polysaccharide mixture

[0030] Prepare a polysaccharide mixture with a final concentration of 2% sodium alginate, 0.15% agar, and 0.2% chitosan, heat to fully dissolve, and after ultrasonic treatment for 10 minutes, stand at 4°C for 30 minutes until the solution has no bubbles and set aside.

[0031] 2) Preparation of polyurethane foam

[0032] Take polyurethane foam with PPI=60~70, and make a cube with a specification of 8mm×8mm×8mm. After repeated squeezing and washing in ultrapure water, immerse in ultrapure water for 20 minutes of ultrasonic treatment, and then squeeze it with ultrapure water. Rinse 3 times, drain excess water, and dry in an oven for later use.

[0033] 3) Polysaccharide-polyurethane immobilization

[0034] Immerse the polyurethane foam prepared in step 2) into the polysaccharide mixture in 1), fully squeez...

Embodiment 2

[0043] A kind of preparation method of polysaccharide-polyurethane heavy metal adsorbent, concrete steps are as follows:

[0044] 1) Preparation of polysaccharide mixture

[0045] Prepare a mixed solution with a concentration of 2% sodium alginate, 0.15% agar, and 0.4% chitosan, heat to fully dissolve, and after ultrasonic treatment for 10 minutes, let it stand at 4°C until the solution has no bubbles, and set aside.

[0046] 2) Preparation of polyurethane foam

[0047] Take the polyurethane foam, squeeze and wash it repeatedly in ultrapure water, immerse it in ultrapure water for 20 minutes, and then squeeze it with ultrapure water for 3 times, drain the excess water, and air dry it for later use.

[0048] 3) Mixing of polysaccharide mixture and other adsorption materials

[0049] Under heating conditions, add spirulina into the polysaccharide mixture and mix evenly, so that the final concentration of spirulina is 4%, to obtain the adsorption mixture.

[0050]4) Polysaccha...

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Abstract

The invention discloses a polysaccharide-polyurethane heavy metal adsorbent and a preparation method thereof. The adsorbent is polyurethane foam which polysaccharides are fixed to. The preparation method of the adsorbent includes: soak-attaching polysaccharide solution to the polyurethane foam, soaking the foam in a fixing liquid for gel fixing, and the polysaccharide-polyurethane heavy metal adsorbent is finally produced. The polysaccharide-polyurethane heavy metal adsorbent prepared herein is efficient in removing heavy metals in food liquid, and separation from the liquid is facilitated. The heavy metal adsorbent simple to operate, widely applicable, economical and practical, efficient in removing heavy metals in liquid food material and beneficial to industrial application is provided.

Description

technical field [0001] The invention relates to a polysaccharide-polyurethane heavy metal adsorbent and a preparation method thereof, belonging to the field of food biotechnology. Background technique [0002] The environmental pollution caused by industrial development has been increasing year by year. Among them, heavy metal pollution has the characteristics of long residual time, strong accumulation, difficult to degrade, difficult to be found and recovered after pollution, and easy to transfer and enrich along the food chain. Heavy metal pollutants can be enriched hundreds of times under the biomagnification of the food chain. Although the heavy metal content of some food raw materials may not exceed the standard, the presence of necessary processing procedures such as concentration during processing may lead to excessive heavy metals in the product. However, food contaminated by heavy metals has caused huge hidden dangers to people's health, and has received widespread...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30B01D15/00
CPCB01D15/00B01J20/24B01J20/262B01J20/265
Inventor 徐莹周婷曹立民汪东风林洪张丹丹
Owner OCEAN UNIV OF CHINA
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