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A preparation method and application of a polyelectrolyte nanomaterial loaded with fe3o4

A technology for polyelectrolyte and nanomaterials is applied in the field of preparation of polyelectrolyte nanomaterials, which can solve the problems of incapability of composite adsorption of various heavy metals, incapability of desorption and reuse, complicated adsorption process, etc., and achieves wide source of raw materials, high promotion and application ability , the preparation method is simple

Active Publication Date: 2019-05-21
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical methods mainly include activated carbon adsorption, electrode method, electromagnetic method, soaking method and functional paper removal method, etc., which have significant disadvantages such as low adsorption efficiency, heavy equipment, and inability to composite adsorb various heavy metals.
Chemical methods include chemical precipitation, removal of inorganic and organic acids, extraction, ion exchange, and ion cross-linking, but they have drawbacks such as toxicity, complicated adsorption process, environmental pollution, and inability to desorb and reuse.
Biological methods such as bioflocculation, biosorption and phytoremediation, etc., but this method has disadvantages such as low adsorption efficiency, long treatment period and high treatment cost.

Method used

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  • A preparation method and application of a polyelectrolyte nanomaterial loaded with fe3o4
  • A preparation method and application of a polyelectrolyte nanomaterial loaded with fe3o4
  • A preparation method and application of a polyelectrolyte nanomaterial loaded with fe3o4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1.1 Loading Fe 3 o 4 Preparation of Polyelectrolyte Nanomaterials

[0038] (1) Depolymerization of β-chitosan

[0039] Dissolve 30g of β-chitosan in 1,000mL of 1% acetic acid solution, stir overnight to fully dissolve, then add 3% β-chitosan cellulase (w:w), fully stir and dissolve, Put it in a water bath at 55°C and react for 7h. After the reaction, the pH of the solution was adjusted with 25% NaOH to make the pH>11. The precipitate was collected and freeze-dried to prepare β-chitosan before depolymerization. The molecular weight and degree of deacetylation of β-chitosan before depolymerization were 3500 kDa and 81.5%, and the molecular weight and degree of deacetylation of β-chitosan after depolymerization reached 150 kDa and 92%, respectively.

[0040] (2) Fe 3 o 4 Preparation of loaded polyelectrolyte nanomaterials

[0041] Weigh 150mg of depolymerized β-chitosan, stir and dissolve in 1% acetic acid solution, set the volume to 100mL, stir fully to prepare tr...

Embodiment 2

[0051] 2.1 Loading Fe 3 o 4 Preparation of Polyelectrolyte Nanomaterials

[0052] (1) depolymerization of chitosan

[0053] Dissolve 40g of β-chitosan in 1,000mL of 1% acetic acid solution, stir overnight to fully dissolve, then add β-chitosan 4% (w:w) cellulase, fully stir and dissolve, Put it in a water bath at 60°C and react for 7 h. After the reaction, the pH of the solution was adjusted with 25% NaOH to make the pH>11. The precipitate was collected and freeze-dried to prepare β-chitosan before depolymerization. The molecular weight and degree of deacetylation of β-chitosan before depolymerization are 3500kDa and 81.5%, and the molecular weight and degree of deacetylation of β-chitosan after depolymerization reach 300kDa and 95% respectively.

[0054] (2) Fe 3 o 4 Preparation of loaded polyelectrolyte nanomaterials

[0055] Weigh 200mg of low molecular weight β-chitosan, stir and dissolve in 1% acetic acid solution, set the volume to 150mL, stir fully to prepare tr...

Embodiment 3

[0064] 3.1 Loading Fe 3 o 4 Preparation of Polyelectrolyte Nanomaterials

[0065] (1) depolymerization of chitosan

[0066] Dissolve 50g of β-chitosan in 1,000mL of 1% acetic acid solution, stir overnight to fully dissolve, then add 3.5% of β-chitosan cellulase (w:w), fully stir and dissolve, Put it in a water bath at 60°C and react for 6h. After the reaction, the pH of the solution was adjusted with 25% NaOH to make the pH>11. The precipitate was collected and freeze-dried to prepare β-chitosan. The molecular weight and degree of deacetylation of β-chitosan before depolymerization are 3500kDa and 81.5%, and the molecular weight and degree of deacetylation of β-chitosan after depolymerization reach 260kDa and 93% respectively.

[0067] (2) Fe loading 3 o 4 Preparation of Polyelectrolyte Nanomaterials

[0068] Weigh 200mg of low molecular weight β-chitosan, stir and dissolve it in 1% acetic acid solution, set the volume to 100mL, stir fully to prepare a transparent β-ch...

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Abstract

The invention discloses a preparation method and application of a Fe3O4-loaded polymerized electrolyte nanomaterial. The preparation method comprises the following steps: by taking biosafety polymerized electrolyte (Chitosan-sodium polyphosphate inclusion) as a base material, preparing the Fe3O4-loaded polymerized electrolyte nanomaterial by adopting an ionic crosslinking method. The preparation method is simple and easy to control, and suitable for industrial production. The prepared Fe3O4-loaded polymerized electrolyte adsorptive nanomaterial can be used in the fields of sewage treatment, soil restoration, food safety and the like, has the advantages of being small in particle size (180-450nm), high in biosafety, large in specific surface area, high in the heavy metal ion adsorption efficiency, and can adsorb heavy metal ions such as copper, zinc and cadmium, with the adsorption rate up to more than 99%.

Description

technical field [0001] The present invention relates to a kind of preparation method of heavy metal adsorption material, more specifically relate to a kind of loading Fe 3 o 4 The preparation method and application of polyelectrolyte nanomaterials. Background technique [0002] Heavy metal pollution has the characteristics of high toxicity, long-term treatment, enrichment and concealment, and it is easy to accumulate through the food chain and seriously affect human health. With the emergence of heavy metal poisoning incidents in recent years, in 2011, the illegal dumping of chromium slag in Qujing, Yunnan; in 2011, the heavy metal pollution incident in Qujing, Yunnan; Pollution; in 2015, Hunan Hengyang Chemical Industry lead pollution; in 2016, Jiangxi Yichun Zhongan Industrial Co., Ltd. contained cadmium, thallium and arsenic in the sewage discharge. Therefore, it is particularly important to prepare efficient, low-cost, and environmentally friendly heavy metal adsorpti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/06B01J20/24C02F1/286C02F2101/103C02F2101/20C02F2101/203C02F2101/22
Inventor 张洪才颜世强张义雯钱亚楠陈舜胜
Owner SHANGHAI OCEAN UNIV
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