Preparation method of straw heavy metal ion adsorbent with semi-interpenetrating network structure

A heavy metal ion and network structure technology, which is applied in the field of preparation of straw heavy metal ion adsorbents with a semi-interpenetrating network structure, to achieve the effects of reducing investment costs, improving dispersion uniformity, and eliminating nitrogen devices

Active Publication Date: 2019-11-12
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The preparation method of straw composite superabsorbent resin is mainly to gelatinize straw, treat with inorganic acid, inorganic alkali or acid anhydride, and then react with corresponding functional monomers. At present, there are no reports of modified acrylic acid with semi-interpenetrating network structure at home and abroad. Preparation of heavy metal ion adsorbents from permanent straw and its adsorption properties of heavy metal ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Wash the cotton stalks with deionized water, dry them, and crush them. Sieve 100-mesh cotton stalk powder, add 5 g of cotton stalk powder to 100 mL N,N-dimethylformamide, and place it in an ultrasonic wave with a frequency of 50 kHz and a power of 1000 W. Clean the tank for ultrasonic pretreatment for 1 hour, transfer the ultrasonically pretreated cotton stalk suspension to a three-necked flask, add 2g of acrylic acid, 2.87g of N,N'-dicyclohexylcarbodiimide and 0.34g of 4-dimethylaminopyridine, and heat up React at 25°C for 6 hours, cool to room temperature, filter, wash with ethanol for 5 times, dry and pulverize to obtain acrylic acid-modified cotton stalks.

[0033] Dissolve 9g of NaOH in 200mL of deionized water, slowly add 24g of acrylic acid to the NaOH aqueous solution in an ice bath, and stir for 2 hours to obtain a partially neutralized acrylic acid aqueous solution; Add 0.12g ethylene glycol diacrylate to partly neutralize the aqueous acrylic acid solution, st...

Embodiment 2

[0035] Wash the sorghum stalks with deionized water, dry them, and crush them. Sieve 200-mesh sorghum stalk powder, add 20g of sorghum stalk powder to 100mL N,N-dimethylformamide, and place it in an ultrasonic wave with a frequency of 50kHz and a power of 600W. Ultrasonic pretreatment in the cleaning tank for 3 hours, transfer the sorghum stalk suspension pretreated by ultrasonic to a three-necked flask, add 10g of acrylic acid, 28.66g of N,N'-dicyclohexylcarbodiimide and 8.48g of 4-dimethylaminopyridine, and heat up React at 40°C for 3.5 hours, cool to room temperature, filter, wash with ethanol three times, dry, and pulverize to obtain acrylic acid-modified sorghum straw.

[0036] Dissolve 7.2g NaOH in 200mL of deionized water, slowly add 20g of acrylic acid to NaOH aqueous solution in an ice bath, and stir for 0.5h to obtain a partially neutralized acrylic acid aqueous solution; 10g of acrylic acid-modified sorghum straw, 20g of acrylamide, Vinylpyrrolidone and 0.08g ethyle...

Embodiment 3

[0038] Soybean straw was washed with deionized water, dried and crushed, 200-mesh soybean straw powder was sieved, 10g of soybean straw powder was added to 100mL N,N-dimethylformamide, and placed in an ultrasonic wave with a frequency of 30kHz and a power of 300W. Ultrasonic pretreatment in the cleaning tank for 6 hours, transfer the ultrasonically pretreated soybean straw suspension to a three-necked flask, add 5g of acrylic acid, 10.03g of N,N'-dicyclohexylcarbodiimide and 2.12g of 4-dimethylaminopyridine, and heat up React at 50°C for 2 hours, cool to room temperature, filter, wash with ethanol for 5 times, dry and pulverize to obtain acrylic acid-modified soybean straw.

[0039] Dissolve 5.4g NaOH in 200mL deionized water, slowly add 16g acrylic acid to the NaOH aqueous solution dropwise in an ice bath, stir for 1 hour to obtain a partially neutralized acrylic acid aqueous solution; mix 6g acrylic acid modified soybean straw, 24g acrylamide, 6g polyethylene Pyrrolidone and...

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Abstract

The invention relates to a method for preparing a straw heavy-metal ion adsorbent with a semi-interpenetrating network structure. The method comprises the steps of firstly, pretreating straws by adopting ultrasonics, then, carrying out acrylic acid grafting modification on the straws, and finally, carrying out graft copolymerization on the acrylic acid modified straws and a functional monomer, thereby preparing the straw heavy-metal ion adsorbent with the semi-interpenetrating network structure and a variety of heavy-metal ion adsorption groups. For a heavy-metal ion aqueous solution with theinitial concentration of 100mg / L to 1,000mg / L, the straw heavy-metal ion adsorbent with the semi-interpenetrating network structure achieves the heavy-metal ion adsorption capacity of 40mg / g to 500mg / g and achieves adsorption equilibrium in 60 to 120 minutes, so that the straw heavy-metal ion adsorbent can be extensively applied to the adsorptive separation of heavy-metal ions, the pollution abatement of the heavy-metal ions and the like.

Description

[0001] 1. Technical field [0002] The invention relates to a method for preparing a straw heavy metal ion adsorbent with a semi-interpenetrating network structure. The straw heavy metal ion adsorbent with a semi-interpenetrating network structure prepared by the invention is suitable for the adsorption and separation of heavy metal ions and can be widely used in heavy metal ions Adsorption, separation and purification of heavy metal ions, and environmental pollution control of heavy metal ions. [0003] 2. Background technology [0004] With the improvement of global industrialization, environmental pollution is becoming more and more serious. Among them, 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C08F251/02C08F220/06C02F101/20C02F101/22
Inventor 万涛邹矗张李蕊香徐敏程文忠苏军陈玉莲
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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