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Preparation method and application of porous hydrogel adsorbent based on astragalus mongholicus waste residue

A porous hydrogel and adsorbent technology, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve the problem that it is impossible to further synthesize porous hydrogel adsorbent materials, and it is difficult to effectively dissolve cellulose Precursor liquid, unfavorable gel system establishment and other problems, to achieve the effect of good reusability, excellent mechanical strength, and strong ability to resist ion interference

Inactive Publication Date: 2021-06-11
SHANGHAI JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of preparing hydrogel adsorbents with the above raw materials (i.e. jute, starch, humic acid) as precursors usually adopts a one-step alkali dissolution method, that is, jute, starch, humic acid can be dissolved by a simple alkali / urea system. However, the one-step alkali dissolution method has a very limited dissolving effect on insoluble raw materials, such as the waste residue of traditional Chinese medicine Astragalus, and it is difficult to effectively dissolve it to obtain the necessary cellulose precursor for porous hydrogel adsorbent materials. As a result, the subsequent cross-linking process is greatly affected, which is not conducive to the establishment of the gel system, so it is impossible to further synthesize porous hydrogel adsorbent materials.

Method used

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  • Preparation method and application of porous hydrogel adsorbent based on astragalus mongholicus waste residue
  • Preparation method and application of porous hydrogel adsorbent based on astragalus mongholicus waste residue
  • Preparation method and application of porous hydrogel adsorbent based on astragalus mongholicus waste residue

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Preparation of cellulose nanofiber precursor (CNFs)

[0041] (1) NaClO 2 Bleaching: In order to dissolve the insoluble astragalus waste residue powder of different quality, first take 100mL NaClO with different mass concentrations of 1wt%, 5wt%, 8wt%, and 10wt%. 2 The solution was placed in four 250mL beakers, marked as I, II, III, and IV, and placed in four water baths in turn. The temperature of the water baths was adjusted to 75°C, and NaClO was added to the four beakers in turn. 2 The mass concentration of the solution corresponds to 0.5g, 5g, 8g, 10g of astragalus waste residue powder, and it is fully stirred for 3 to 4 hours;

[0042] (2) KOH alkali washing: After the yellow powder gradually turns white, take out the beaker, let it stand for 5 minutes, pour off the supernatant, and add 100mL to the 4 beakers in turn with a mass concentration of 1wt%, 5wt%, 8wt%, and 10wt%. KOH solution, adjust the temperature of the water bath to 90°C, and continue...

Embodiment 2

[0045] Example 2: Preparation of CNFs / PAA double network hydrogel adsorbent material

[0046] Take four 5mL centrifuge tubes, weigh about 20mg of N-N'methylenebisacrylamide (MBA) powder into each of the four centrifuge tubes, add 600 μL of acrylic acid monomer to the four centrifuge tubes with a pipette Dissolve the joint agent MBA, then take 3mL of CNFs solution from the high beakers I, II, III, and IV in the centrifuge tubes, and finally add 5mg of ammonium persulfate (APS) powder to the four centrifuge tubes in sequence, shake well to mix them Evenly, place 4 centrifuge tubes in an oven at 60°C for 4 hours to obtain 4 kinds of columnar CNFs / PAA double network hydrogel adsorbent materials, which are denoted as CNFs / PAA-1, CNFs / PAA-2, and CNFs / PAA -3. CNFs / PAA-4.

[0047] h 2 Preparation of O / PAA hydrogel material: Take a 5mL centrifuge tube, add 20mg N-N' methylenebisacrylamide (MBA) powder, 3mLH 2 O. 600 μL of acrylic acid (AA) monomer, 5 mg of ammonium persulfate (APS) ...

Embodiment 3

[0049] Example 3: NH 2 - Preparation of CNFs / PAA

[0050] Select CNFs / PAA with a cellulose content of 5wt% as the material to be modified, cut it into thin slices, and add it to the 2mLDMSO solution containing 0.1g NaOH and 0.15mL epichlorohydrin at a ratio of 2mLDMSO per 0.6mL , reacted at 60°C for 1h, after the reaction was completed, transferred it to 2mL NaOH aqueous solution containing 0.2mL triethylenetetramine with concentrations of 2wt%, 7wt%, 12wt%, 16wt%, and 20wt%, and reacted at 60°C for 2h , denoted as NH 2 -CNFs / PAA-1, NH 2 -CNFs / PAA-2, NH 2 -CNFs / PAA-3, NH 2 -CNFs / PAA-4, NH 2 -CNFs / PAA-5. The mechanical properties of the obtained material: NH 2 -CNFs / PAA-1>NH 2 -CNFs / PAA-2≈NH 2 -CNFs / PAA-3≈NH 2 -CNFs / PAA-4 >> NH 2 -CNFs / PAA-5. The adsorption capacity of the obtained material is 525 mg / g, 900 mg / g, 900 mg / g, 900 mg / g, 950 mg / g in sequence.

[0051]In summary, the following three points need to be paid attention to when preparing the dual network gel ...

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Abstract

The invention discloses a preparation method of a porous hydrogel adsorbent based on astragalus mongholicus waste residue. The preparation method comprises the following steps: taking traditional Chinese medicine astragalus mongholicus waste residue as a precursor, performing NaClO2 bleaching, KOH alkali washing and high-power ultrasonic treatment to obtain a uniformly dispersed cellulose nanofiber precursor solution; adding the cellulose nanofiber precursor solution into a mixed solution of N-N'methylene bisacrylamide, acrylic acid and ammonium persulfate, uniformly shaking, and carrying out polymerization reaction at a preset temperature to form blocky gel; and washing the blocky gel, placing the blocky gel in a dimethyl sulfoxide solution containing epoxy chloropropane for reaction, transferring the reacted product into a sodium hydroxide aqueous solution containing triethylene tetramine for reaction, and finally obtaining the amino functional modified porous hydrogel adsorbent. The traditional Chinese medicine waste residues are subjected to resource utilization, and the synthesized gel adsorbent can be further applied to adsorption removal of heavy metals and is excellent in adsorption performance, low in cost, high in stability, high in ion interference resistance and good in reusability.

Description

technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and relates to a preparation method and application of a porous hydrogel adsorbent based on astragalus waste residue. Background technique [0002] China has a variety of large-scale mineral resources, 171 kinds of mineral resources have been proven, and the reserves account for 12% of the world's total mineral resources. In addition, China is one of the world's largest producers and consumers of metals / metalloids such as antimony (Sb), iron (Fe), lead (Pb), manganese (Mn), tin (Sn), tungsten (W) and zinc (Zn). At present, some conventional physical and chemical treatment technologies are prone to produce a large amount of waste sediment, causing secondary pollution, and easy to diffuse into the environment again, and cannot completely cure heavy metal pollution in water bodies. Therefore, it is imperative to develop a green, simple, effective and economical treatment m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/261B01J20/24B01J20/28047C02F1/288C02F2101/20B01J2220/4825B01J20/3085B01J20/3071C08J3/075C08J2333/02B01J2220/445B01J2220/4812C08J2301/02C08J2333/26
Inventor 罗金明邱志远
Owner SHANGHAI JIAOTONG UNIV
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