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Straw-based hydrogel adsorbent for efficiently removing heavy metal ions and preparation method thereof

A technology of hydrogel adsorbent and heavy metal ions, which is applied in the fields of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of straw-based adsorbent removal inconvenience, etc. Gentle, easily controlled effect

Pending Publication Date: 2020-04-10
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the crushed modified straw has completed the adsorption of heavy metal ions, it is inconvenient to remove the straw-based adsorbent subsequently.

Method used

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  • Straw-based hydrogel adsorbent for efficiently removing heavy metal ions and preparation method thereof
  • Straw-based hydrogel adsorbent for efficiently removing heavy metal ions and preparation method thereof
  • Straw-based hydrogel adsorbent for efficiently removing heavy metal ions and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The rice straw (RS) was crushed and cleaned by ultrasonic treatment with ethanol and acetone, and then dried in an oven.

[0043] Dip 20 g of dried rice straw into a modified solution containing 20 g of 2-bromoisobutyryl bromide, 40 g of triethylamine and 100 g of DMF; stir at room temperature for 12 hours to prepare 2-bromoisobutyryl bromide modified Modified straw (code named RS-Br).

[0044] Wash the RS-Br to remove residual reactants and dry it in an oven. Weigh 5g again and add in the Schlenk reaction flask that solvent DMF (25g) is housed, then add cross-linking agent DVB (1%, 60mg), then add styrene monomer (13mL), acrylonitrile (5mL), catalyst CuBr 2 (25.0mg, 0.11mmol) and the organic ligand PMDETA (29 μl), stirred thoroughly; after deoxygenation by nitrogen gas, 25mg reducing agent stannous isooctanoate was added, and reacted at 60°C for 48h to obtain straw-based hydrogel (RS-g -PSAN).

[0045] Add the above-prepared RS-g-PSAN to a solution containing 20mL D...

Embodiment 2

[0060] Wheat straw (WS) was crushed and cleaned by ultrasonic treatment with ethanol and acetone, and dried in an oven. Dip 20g of dried wheat straw (WS) into a modified solution consisting of 2-bromo-2-methylpropionyl bromide (40g), triethylamine (40g) and DMSO (100g), and stir at room temperature for 12h , and prepared 2-bromo-2-methylpropionyl bromide-modified modified straw (code named WS-Br). Wash the WS-Br to remove residual reactants and dry it in an oven. The dried 5g WS-Br was soaked into the solution containing acrylonitrile monomer (13mL), DMSO (30g), MBA (0.5%, 9mg), CuCl 2 (19mg, 0.11mmol) and bpy (29μl) Schlenk reaction flask, after purging nitrogen to remove oxygen, add 50mg reducing agent stannous isooctanoate, react at 60℃ for 40h, and obtain straw-based hydrogel (WS-g-PAN) .

[0061] Add the above-prepared WS-g-PAN to a container containing 20mL DMAC, 2g catalyst AlCl 3 ·6H 2 In a three-necked flask of O and 30 mL of diethylenetriamine, pass N 2 30min,...

Embodiment 3

[0064]The rice straw (RS) was pulverized, washed, and dried in an oven. 12 g of dried straw were immersed in a solution containing 2-bromo-2-methylpropionyl chloride (48 g), pyridine (36 g) and DMF (100 g). The solution was stirred at room temperature for 12 hours to prepare 2-bromo-2-methylpropionyl chloride modified straw, whose code name was RS-Cl. Wash RS-Cl to remove residual reactants, and dry in an oven. Immerse 2g of RS-Cl into a solution containing methacrylonitrile monomer (5mL), DMF (30g), HAM (1%, 0.4g), CuCl 2 (19.0mg, 0.11mmol) and TMPA (29μl) in a Schlenk reaction flask, after purging nitrogen to remove oxygen, add 30mg reducing agent stannous isooctanoate, react at 60°C for 12h, and obtain RS-g-PMAN modified straw.

[0065] Add the above-prepared RS-g-PMAN to the solution containing 20mL DMSO, 2g catalyst AlCl 3 ·6H 2 In the three-necked flask of O and 30mL triethylenetetramine, pass N 2 After 30 minutes, the reaction was continued in a 90°C water bath fo...

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Abstract

The invention discloses a straw-based hydrogel adsorbent for efficiently removing heavy metal ions and a preparation method of the straw-based hydrogel adsorbent. The preparation method comprises thefollowing steps: immersing straw powder into a modification solution for modification so as to obtain modified straw immobilized by an initiator; grafting an acrylonitrile polymer on the surface of the modified straw by adopting an atom transfer radical polymerization process, and preparing acrylonitrile polymer modified straw-based hydrogel by virtue of a cross-linking agent; and adding the straw-based hydrogel into an amination reagent for modification to prepare the straw-based hydrogel adsorbent. The straw-based hydrogel adsorbent prepared by the preparation method disclosed by the invention can be used for efficiently removing heavy metal ions, and meanwhile, the straw-based gel serving as the adsorbent is also easily removed from a purified water body environment.

Description

technical field [0001] The invention belongs to the technical field of water treatment materials, and in particular relates to a straw-based hydrogel for efficiently removing heavy metal ions and a preparation method thereof. Background technique [0002] With the improvement of global industrialization, environmental pollution is becoming more and more serious, among which water pollution has seriously affected people's production and life. Industrial wastewater is the main source of heavy metal pollution in water bodies. Many industrial processes, such as electroplating, tanning, mining, steelmaking, dyeing, etc., will produce a large amount of wastewater containing heavy metal ions, such as Pb 2+ , Fe 3+ 、Ni 2+ 、Cr 3+ Wait. Because these heavy metal ions cannot be biodegraded and can also enter the human body through the food chain and accumulate, they will cause serious harm to people's health. Therefore, in recent years, the treatment of wastewater containing heavy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28047C02F1/286C02F2101/20
Inventor 张建安余鹏祥吴明元吴庆云杨建军刘久逸
Owner ANHUI UNIVERSITY
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