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Preparation method and application of edible chitosan-pectin gel beads for adsorbing heavy metals

A technology for adsorbing heavy metals and chitosan, applied in the directions of alkali metal compounds, chemical instruments and methods, adsorbed water/sewage treatment, etc. The effect of stability

Pending Publication Date: 2021-06-04
NANJING UNIV OF FINANCE & ECONOMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current adsorbents for adsorption and removal of heavy metals have major shortcomings: the preparation process of the adsorbent is relatively complicated, not environmentally friendly, and there is secondary pollution, especially in the treatment of drinking water, fruit juice, drinks etc.
However, chitosan has disadvantages such as instability in acidic solution, poor mechanical strength, and low adsorption capacity, which hinder its application in the field of heavy metal removal.
Common modification methods are cumbersome and mostly use highly toxic chemical crosslinking agents

Method used

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  • Preparation method and application of edible chitosan-pectin gel beads for adsorbing heavy metals
  • Preparation method and application of edible chitosan-pectin gel beads for adsorbing heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An adsorbed Cu 2+ Preparation of Edible Chitosan-Pectin Gel Beads:

[0025] Step 1, preparing chitosan-pectin hydrosol: dissolving 2g chitosan and 1g pectin in 100mL food-grade hydrochloric acid solution with an acidity value of 1, stirring evenly at room temperature to prepare chitosan-pectin hydrosol;

[0026] Step 2, preparing chitosan-pectin wet gel balls: slowly drop the chitosan-pectin hydrosol prepared in step 1 into the 1mol / L edible caustic soda solution to obtain light yellow chitosan sugar-pectin wet gel balls;

[0027] Step 3, prepare chitosan-pectin gel beads: wash the chitosan-pectin wet gel balls prepared in step 2 to neutrality with distilled water, and then place them in a freeze dryer (FD-IC vacuum freeze Drying machine, Spain Telstar company) (-50 ℃, 48h) for freeze-drying, prepared edible chitosan-pectin gel beads adsorbing heavy metals.

[0028] Put the chitosan-pectin gel beads prepared in this embodiment into the 2+ Shake in the water sample f...

Embodiment 2

[0030] an adsorbed Cd 2+ Preparation of Edible Chitosan-Pectin Gel Beads:

[0031] Step 1, preparing chitosan-pectin hydrosol: dissolving 2g chitosan and 1g pectin in 100mL food-grade hydrochloric acid solution with an acidity value of 1, stirring evenly at room temperature to prepare chitosan-pectin hydrosol;

[0032] Step 2, preparing chitosan-pectin wet gel balls: slowly drop the chitosan-pectin hydrosol prepared in step 1 into the 1mol / L edible caustic soda solution to obtain light yellow chitosan sugar-pectin wet gel balls;

[0033] Step 3, prepare chitosan-pectin gel beads: wash the chitosan-pectin wet gel balls prepared in step 2 to neutrality with distilled water, and then place them in a freeze dryer (FD-IC vacuum freeze Drying machine, Spain Telstar company) (-50 ℃, 48h) for freeze-drying, prepared edible chitosan-pectin gel beads adsorbing heavy metals.

[0034] Put the chitosan-pectin gel beads prepared in this embodiment into the 2+ Shake in the water sample f...

Embodiment 3

[0036] an adsorbed Hg 2+ Preparation of Edible Chitosan-Pectin Gel Beads:

[0037] Step 1, preparing chitosan-pectin hydrosol: dissolving 2g chitosan and 1g pectin in 100mL food-grade hydrochloric acid solution with an acidity value of 1, stirring evenly at room temperature to prepare chitosan-pectin hydrosol;

[0038] Step 2, preparing chitosan-pectin wet gel balls: slowly drop the chitosan-pectin hydrosol prepared in step 1 into 1-2mol / L edible caustic soda solution to obtain light yellow Chitosan-pectin wet gel balls;

[0039] Step 3, prepare chitosan-pectin gel beads: wash the chitosan-pectin wet gel balls prepared in step 2 to neutrality with distilled water, and then place them in a freeze dryer (FD-IC vacuum freeze Drying machine, Spain Telstar company) (-50 ℃, 48h) for freeze-drying, prepared edible chitosan-pectin gel beads adsorbing heavy metals.

[0040] Put the chitosan-pectin gel beads prepared in this embodiment into the 2+ Shake in the water sample for 8h, t...

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Abstract

The invention discloses a preparation method of edible chitosan-pectin gel beads for adsorbing heavy metals, which comprises the following steps: step 1, preparing chitosan-pectin hydrosol: dissolving chitosan and pectin in a hydrochloric acid solution, and uniformly stirring to prepare the chitosan-pectin hydrosol; step 2, preparing chitosan-pectin wet gel balls: slowly dropwise adding the chitosan-pectin hydrosol prepared in the step 1 into a caustic soda flake solution to prepare the chitosan-pectin wet gel balls; and step 3, preparing chitosan-pectin gel beads: washing the chitosan-pectin wet gel beads prepared in the step 2 with distilled water until the chitosan-pectin wet gel beads are neutral, and then performing freeze drying to prepare the edible chitosan-pectin gel beads for adsorbing heavy metals. The prepared chitosan-pectin gel bead has the advantages of good stability, high mechanical strength, excellent adsorption performance and the like, a chemical cross-linking agent does not need to be adopted in the preparation process, and the chitosan-pectin gel bead is green and safe.

Description

technical field [0001] The invention belongs to the technical field of preparation of water treatment materials, in particular to a preparation method and application of edible chitosan-pectin gel beads that absorb heavy metals. Background technique [0002] With the rapid development of modernization, urbanization and industrialization, the problem of heavy metal pollution has become increasingly prominent. Heavy metals such as lead, copper, cadmium, mercury, etc. are difficult to be biodegraded, and have strong toxicity at low exposure levels. At the same time, they can accumulate in organisms through the food chain, endangering human life and health. [0003] At present, common methods for removing heavy metals include chemical precipitation, ion exchange, electrochemical reaction, and adsorption, among which adsorption is one of the most economical and effective methods. However, the current adsorbents for adsorption and removal of heavy metals have major shortcomings: ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28047B01J20/28021C02F1/285C02F2101/20
Inventor 李彭邵志颖方勇薛梅陆继来夏季邢常瑞沈飞
Owner NANJING UNIV OF FINANCE & ECONOMICS