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Preparation method of sodium alginate-cyclodextrin based material for treating metal processing wastewater

A sodium alginate and metal processing technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of slow adsorption speed and low material strength, and achieve improved adsorption efficiency and water solubility Good, environment-friendly effect

Inactive Publication Date: 2018-11-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of slow adsorption speed and low material strength of natural sodium alginate and cyclodextrin materials in the treatment of metal processing wastewater in the prior art, the purpose of the present invention is to provide a method for preparing materials for treating metal processing wastewater

Method used

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  • Preparation method of sodium alginate-cyclodextrin based material for treating metal processing wastewater
  • Preparation method of sodium alginate-cyclodextrin based material for treating metal processing wastewater
  • Preparation method of sodium alginate-cyclodextrin based material for treating metal processing wastewater

Examples

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Embodiment 1

[0028] A method for preparing a sodium alginate-cyclodextrin-based material for treating metal processing wastewater, comprising the following steps:

[0029] 1) Prepare 10g of sodium alginate, 2g of β-cyclodextrin, and 1g of nano-silica, mix well, add 400ml of deionized water, stir at 30°C for 12h, and make a uniform solution A;

[0030] 2) Add 15ml PEG-400 to solution A, stir at 30°C for 24 hours, and make uniform solution B;

[0031] 3) Prepare 400ml cross-linking agent aqueous solution C, the mass concentration of cross-linking agent is 4% CaCl 2 +2% glutaraldehyde;

[0032] 4) Slowly add solution B to solution C dropwise at a rate of 20 drops / min, and stir and react for 24 hours at 50°C under nitrogen protection to obtain the crude material;

[0033] 5) The crude product obtained in step 4) was washed with ethanol for 3 times, then washed with deionized water for 3 times, and then dried at 60°C to obtain a sodium alginate-cyclodextrin-based material. The channel formati...

Embodiment 2

[0035] A method for preparing a sodium alginate-cyclodextrin-based material for treating metal processing wastewater, comprising the following steps:

[0036] 1) Prepare 10g sodium alginate, 3g cyclodextrin-modified nano-titanium dioxide (the preparation method of cyclodextrin-modified nano-titanium dioxide is: cyclodextrin 1g + nano-titanium dioxide 1g, under nitrogen protection, grind and mix in a mortar for 1h), 1g of nano-silica, after uniform mixing, add 400ml of deionized water, stir at 30°C for 12h, and make a uniform solution A;

[0037] 2) Add 40ml of 10% PVA-124 aqueous solution (mass concentration) to solution A, stir at 30°C for 24 hours, and make a uniform solution B;

[0038] 3) Prepare 400ml cross-linking agent aqueous solution C, the cross-linking agent content is 4% CaCl2+2% glutaraldehyde;

[0039] 4) Slowly add solution B dropwise to solution C at a rate of 25 drops / min, stir and react for 24 hours at 50°C under nitrogen protection to obtain the crude mater...

Embodiment 3

[0042] A method for preparing a sodium alginate-cyclodextrin-based material for treating metal processing wastewater, comprising the following steps:

[0043] 1) Prepare 10g of sodium alginate, 3g of cyclodextrin-modified nano-titanium dioxide (cyclodextrin 1g + nano-titanium dioxide 1g, under nitrogen protection, grind and mix in a mortar for 1h), 1g of nano-silicon dioxide, mix evenly, add 400ml Stir in deionized water for 12 hours at 30°C to prepare a homogeneous solution A;

[0044] 2) Add 40ml PEG-400 to solution A, stir at 30°C for 24 hours, and make uniform solution B;

[0045] 3) Prepare 400ml crosslinking agent aqueous solution C, the mass concentration of crosslinking agent is 4% calcium acetate + 2% epichlorohydrin;

[0046]4) Slowly add solution B to solution C dropwise at a rate of 20 drops / min, and stir and react for 24 hours at 50°C under nitrogen protection to obtain the crude material;

[0047] 5) The crude material obtained in step 4) was washed with ethano...

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Abstract

The invention discloses a preparation method of a sodium alginate-cyclodextrin based material for treating metal processing wastewater. The preparation method comprises the following steps: after mixing sodium alginate, a cyclodextrin material and a material activity and rigidity adjusting component, adding a mixture into de-ionized water; stirring at room temperature for 8 to 12h; then adding a pore-forming agent; stirring at room temperature to prepare a uniform solution B; after de-foaming, dropwise adding a crosslinking agent water solution C; stirring and reacting for 24h under the protection of nitrogen gas at 50 to 80 DEG C; washing an obtained product with ethanol and de-ionized water, so as to remove an unreacted crosslinking agent; then drying at 60 to 80 DEG C, so as to obtain asodium alginate-cyclodextrin based material product. The sodium alginate-cyclodextrin based material prepared by the preparation method can be used for treating materials containing a lot of heavy metal ions and has high treatment efficiency and good mechanical strength; the material can be used for adsorbing ions including Cu<2+>, Fe<3+>, Cr<3+>, Pb<2+> and the like and has a certain fixation effect on boric acid; the material has a wide raw material source, has relatively high reaction activity and stability and has very good application value and popularization prospect.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, and in particular relates to a preparation method of a material used for treating metal processing wastewater. Background technique [0002] In the metal processing industry, wastewater containing metal ions and organic matter will be generated in polishing, rust removal, electroplating and other processes. Metal processing wastewater has the characteristics of high pollutant content, complex components, and large changes in water quality. It is one of the difficult industrial wastewater to treat. The wastewater contains Cu 2+ , Fe 2+ , Fe 3+ 、Cr 3+ , Pb 2+ and other metal ions, as well as boric acid, cyanide, ammonium chloride, organic phosphorus and other substances. Among them, heavy metal ions are highly toxic, and it is difficult for them to be metabolized by organisms in the environment. At the same time, heavy metal ions are easily absorbed by plants, and then gather in animals and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28
CPCB01J20/043B01J20/103B01J20/22B01J20/24B01J20/3064B01J20/3078C02F1/281C02F1/286
Inventor 李琰君杨阿三张建庭屠美玲贾继宁许轶蔡金法
Owner ZHEJIANG UNIV OF TECH
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