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A kind of preparation method of straw/hectorite composite heavy metal ion adsorbent

A technology of heavy metal ions and hectorite, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc. Effect

Active Publication Date: 2019-09-24
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 is no report of acrylic acid modified straw / hectorite composite at home and abroad. Preparation of Heavy Metal Ion Adsorbent and Study on Its Adsorption Performance of Heavy Metal Ion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The sorghum straw was washed with deionized water, dried and crushed, and 100-mesh sorghum straw powder was sieved, and 5 g of sorghum straw powder was added to 100 mL of N,N-dimethylformamide, and placed 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 sorghum stalk suspension pretreated by ultrasonic 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 sorghum straw.

[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 of ethylene glycol diacrylate to partially neutralize the aqueou...

Embodiment 2

[0035] Wash the wheat straw with deionized water, dry it and crush it, sieve the 200-mesh wheat straw powder, add 20g of the wheat straw powder to 100mL N,N-dimethylformamide, 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 ultrasonically pretreated wheat straw suspension 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 3.5h, cool to room temperature, filter, wash with ethanol three times, dry and pulverize to obtain acrylic acid-modified wheat straw.

[0036] Dissolve 7.2g NaOH in 200mL deionized water, slowly add 20g acrylic acid to the NaOH aqueous solution in an ice bath, and stir for 0.5h to obtain a partially neutralized acrylic acid aqueous solution; 10g acrylic acid modified wheat straw, 20g acrylamide, 8g lithium Add soapstone and 0.08g ethylene glycol diacrylate...

Embodiment 3

[0038] Wash the cotton stalks with deionized water, dry them and crush them. Sieve 200-mesh cotton stalk powder, add 10g of cotton stalk powder to 100mL N,N-dimethylformamide, and place it in an ultrasonic wave with a frequency of 30kHz and a power of 300W. The cleaning tank was ultrasonically pretreated for 6 hours, and the ultrasonically pretreated cotton straw suspension was transferred to a three-necked flask, and 5g of acrylic acid, 10.03g of N,N'-dicyclohexylcarbodiimide and 2.12g of 4-dimethylaminopyridine were added, Raise the temperature to 50°C for 2 hours, cool to room temperature, filter, wash with ethanol five times, dry and pulverize to obtain acrylic acid-modified cotton stalks.

[0039] Dissolve 5.4g NaOH in 200mL of deionized water, slowly add 16g of acrylic acid to the NaOH aqueous solution dropwise in an ice bath, and stir for 1 hour to obtain a partially neutralized acrylic acid aqueous solution; Stone and 0.10g of ethylene glycol diacrylate were added to p...

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Abstract

The invention relates to a preparation method of a straw / hectorite compound heavy metal ion adsorbent. The method includes: conducting ultrasonic pretreatment on straw, then performing acrylic acid graft modification, and finally acrylic acid modified straw, hectorite and a functional monomer to grafting copolymerization to prepare the straw / hectorite compound heavy metal ion adsorbent with inorganic-organic double-network structure, multilevel cross-linking points and multiple heavy metal ion adsorption groups. For a heavy metal ion aqueous solution with an initial concentration of 50-600mg / L, the heavy metal ion adsorption capacity of the straw / hectorite compound heavy metal ion adsorbent reaches 30-500mg / g, and adsorption equilibrium can be achieved in 60-100min, therefore the straw / hectorite compound heavy metal ion adsorbent can be widely applied to heavy metal ion adsorption separation, heavy metal ion pollution treatment, etc.

Description

[0001] 1. Technical field [0002] The invention relates to a method for preparing a straw / hectorite composite heavy metal ion adsorbent. The straw / hectorite composite heavy metal ion adsorbent 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, heavy metal Ion separation and purification and environmental pollution control of heavy metal ions, etc. [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 Cd 2+ 、Cu 2+ , Pb 2+ 、Ni 2+ 、As 3+ , Hg 2+ 、Cr ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F289/00C08F220/56C08F222/14C08F222/20C08F2/44B01J20/26B01J20/30C02F1/28C02F101/20
Inventor 万涛徐敏程文忠邹矗张李蕊香薛子豪蔡蒇
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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