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Method for preparing heavy metal ion adsorption materials of crop straws

A technology of heavy metal ions and crop straws, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of less application research on the adsorption performance of heavy metal ions, and achieve agricultural The effects of sustainable development, enhanced hydrogen bonding, and reduced input costs

Inactive Publication Date: 2014-08-20
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation method of straw composite superabsorbent resin is mainly to conduct gelatinization, acid, alkali or acid anhydride treatment on straw first, and then react with corresponding functional monomers, mainly to study the water absorption, water retention and salt absorption performance of straw composite superabsorbent resin, and There are few studies on the application of adsorption properties of heavy metal ions. At present, there are no reports at home and abroad about the preparation of phytic acid modified straw heavy metal ion adsorption materials and their application research on the adsorption of heavy metal ion solutions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Cut the cotton stalks into pieces, wash them with deionized water 4 times, dry them in an oven at 60°C, crush them, and sieve 100-mesh cotton stalk powder, add 50 g of cotton stalk powder to 200 g of N,N-dimethylformaldehyde In the amide, put it in an ultrasonic cleaning tank with a frequency of 50kHz and a power of 500W at 50°C for 40 minutes, then add 10g of phytic acid and 1g of urea to the above system, raise the temperature to 70°C, and cool the product to room temperature after 4 hours of reaction. Filtrate, wash with ethanol for 5 times, dry in an oven at 60°C, and pulverize to obtain phytic acid-modified cotton stalks; dissolve 10 g of NaOH in 250 mL of deionized water, and then slowly drop 18 g of itaconic acid into NaOH aqueous solution in an ice bath, Stir well, add 12.5g of phytic acid modified cotton straw, 25g of acrylamide, 7g of vinylpyrrolidone and 0.05g of ethylene glycol diacrylate after reacting for 1 hour, stir well for 30 minutes, gradually raise th...

Embodiment 2

[0031] Cut the straw straw into pieces, wash it with deionized water 4 times, dry it in an oven at 70°C, crush it, and sieve the rice straw powder of 100 meshes, add 40g of the rice straw powder to 200g of N,N-dimethyl formazan In the amide, put it in an ultrasonic cleaning tank with a frequency of 50kHz and a power of 300W at 50°C for 40 minutes, then add 25g of phytic acid and 4.0g of urea to the above system, raise the temperature to 90°C, and cool the product to room temperature after 2 hours of reaction , filtered, washed three times with ethanol, dried in an oven at 80°C, and crushed to obtain phytic acid-modified rice straw; dissolve 10 g of NaOH in 250 mL of deionized water, and then slowly drop 10 g of itaconic acid into NaOH aqueous solution in an ice bath , stir well, add 7.5g of phytic acid modified rice straw, 40g of acrylamide, 5g of vinylpyrrolidone and 0.23g of polyethylene glycol diacrylate after reacting for 2h, stir well for 30min, gradually raise the tempera...

Embodiment 3

[0033] Cut soybean straw into pieces, wash with deionized water 4 times, dry in an oven at 80°C, crush, and sieve 100-mesh soybean straw powder, add 25g of soybean straw powder to 200g of N,N-dimethylformaldehyde In the amide, put it in an ultrasonic cleaning tank with a frequency of 20kHz and a power of 500W at 30°C for 60 minutes, then add 15g of phytic acid and 2.5g of urea to the above system, raise the temperature to 50°C, and cool the product to room temperature after 6 hours of reaction , filtered, washed 5 times with ethanol, dried in an oven at 80°C, and crushed to obtain phytic acid-modified soybean straw; 5g NaOH was dissolved in 250mL deionized water, and then 15g itaconic acid was slowly added dropwise to NaOH aqueous solution in an ice bath , stir well, add 2.4g phytic acid modified soybean straw, 25g acrylamide, 8g vinylpyrrolidone and 0.384g 1,3-propanediol diacrylate after reacting for 2h, stir well for 30min, gradually raise the temperature to 55℃, and then pu...

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Abstract

The invention relates to a method for preparing heavy metal ion adsorption materials of crop straws. The method is characterized by comprising the following processing steps: adding straw powder into N, N-dimethyl formamide; putting the straw powder and the N, N-dimethyl formamide into an ultrasonic rinsing tank for ultrasonic cleaning at a certain temperature for a certain time; then adding phytic acid and urea into the above system, heating to 50-90 DEG C, cooling products to a room temperature after reaction for a certain time, and then precipitating, washing, drying and grinding the products to obtain phytic acid modified straws; neutralizing itaconic acid with NaOH, then adding the phytic acid modified straws, acrylamide, vinyl pyrrolidone and cross-linking agents, after the mixture is fully stirred, gradually heating to 40-60 DEG C, and finally slowly and dropwise adding redox initiators into the polymerization system to initiate a polymerization reaction that lasts for 3-5 hours; after the polymerization is completed, performing precipitation, washing and drying to obtain the heavy metal ion adsorption materials of crop straws. The adsorption capacity reaches 50-800mg / g for heavy metal ion water solutions of which the initial concentration is 100-1000mg / l, and adsorption equilibrium is reached after adsorption at the room temperature for 50-150 min.

Description

technical field [0001] The invention relates to a method for preparing a crop straw heavy metal ion adsorption material. The crop straw heavy metal ion adsorption material prepared by the invention is suitable for the adsorption and separation of heavy metal ions, and can be widely used in heavy metal ion adsorption, separation, purification and heavy metal ion environmental pollution control wait. Background technique [0002] 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 Cd 2+ 、Cu 2+ , Pb 2+ 、Ni 2+ , Zn 2+ , Mn 2+ 、As 3+ , Hg 2+ 、Cr 3+ 、Co 2+ and Co 3+ etc., because h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F220/56C08F226/10C08F222/02C08F222/20C08F222/14C08F222/38C08H8/00B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 万涛熊磊孙萌萌覃莉莉谭雪梅胡俊燕
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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