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Preparation method of modified cellulose aerogel adsorbing heavy metal

A technology for cellulose aerogel and heavy metal adsorption, applied in alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of high regeneration time, energy consumption, high production cost, and achieve good adsorption performance , the effect of environmental friendliness and low cost

Active Publication Date: 2018-07-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although activated carbon is the most widely used adsorbent for heavy metals, its production cost is high, its regeneration time and energy consumption are relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of the modified cellulose airgel adsorbing heavy metals, its specific steps are as follows:

[0030] Step 1. Peel the air-dried corn stalks (with a water content of 5 wt%) and cut them into 1 cm length to obtain qualified corn stalks;

[0031] Step 2, the 2g qualified corn tangerine raw material obtained in step 1 is 2:60g / mL to add deionized water according to the solid-to-liquid ratio, then add glacial acetic acid according to the volume ratio of deionized water and glacial acetic acid to 60:6mL, and Add sodium chlorite and mix evenly at a ratio of 2:7.2, seal and treat at a temperature of 55°C until the raw material turns white completely. After the reaction, transfer the reactant to a 200-mesh nylon bag and soak it repeatedly with deionized water Washing until the material is neutral, the excess water is removed to obtain cellulose;

[0032] Step 3. Mix the helium cellulose obtained in step 2 with a potassium hydroxide aqueous solution with a...

Embodiment 2

[0038] The preparation method of the modified cellulose airgel adsorbing heavy metals, its specific steps are as follows:

[0039] Step 1. Peel the air-dried corn stalks (with a water content of 20wt%) and cut them into a length of 5 cm to obtain a qualified raw material of corn stalks;

[0040] Step 2, the 10g qualified corn tangerine raw material that step 1 obtains is that 10:350g / mL is added deionized water according to solid-liquid ratio, then is 350:15 to add glacial acetic acid according to deionized water and glacial acetic acid volume ratio, and according to mass Add sodium chlorite at a ratio of 10:24 and mix evenly. After sealing, treat at a temperature of 65°C until the raw material turns white completely. After the reaction, transfer the reactant to a 350-mesh nylon bag and soak it repeatedly with deionized water. Washing until the material is neutral, the excess water is removed to obtain cellulose;

[0041] Step 3, the 1g hemal cellulose obtained in step 2 and ...

Embodiment 3

[0047] The preparation method of the modified cellulose airgel adsorbing heavy metals, its specific steps are as follows:

[0048] Step 1. Peel the air-dried corn stalks (with a water content of 20wt%) and cut them into a length of 10 cm to obtain a qualified raw material of corn stalks;

[0049] Step 2, the 20g qualified corn tangerine raw material that step 1 obtains is that 20:650g / mL adds deionized water according to solid-to-liquid ratio, then is 650:25 to add glacial acetic acid according to deionized water and glacial acetic acid volume ratio, and according to mass Add sodium chlorite at a ratio of 20:60 and mix evenly. After sealing, treat the raw material at a temperature of 80°C until the raw material turns white completely. After the reaction is completed, transfer the reactant to a 500-mesh nylon bag and soak it repeatedly with deionized water. Washing until the material is neutral, the excess water is removed to obtain cellulose;

[0050] Step 3, the 1g hemal cel...

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Abstract

The invention relates to a preparation method of modified cellulose aerogel adsorbing heavy metal and belongs to the technical field of natural polymer modified materials. The preparation method comprises steps as follows: corn stalks are air-dried, peeled and cut, and a qualified corn stalk core raw material is obtained; the qualified corn stalk core raw material is subjected to lignin removing with acidic sodium chlorite, and then corn stalk core cellulose is extracted by an aqueous potassium hydroxide solution; obtained corn stalk core cellulose is heated and dissolved by a metal solution,a dissolved solution is dropwise added to ethanol bath, and cellulose aerogel is formed by regeneration; the cellulose aerogel is modified through graft copolymerization, after the reaction is completed, a product is subjected to impurity removing, purified and dried, and then the modified cellulose aerogel adsorbing heavy metal is obtained. According to the preparation method, the corn stalks which are easily available but not developed thoroughly are taken as the raw material, corn stalk core cellulose is extracted, the cellulose aerogel is prepared with dissolving and regenerating technologies, and the modified cellulose aerogel adsorbent is obtained by graft copolymerization.

Description

technical field [0001] The invention relates to a preparation method of a modified cellulose airgel that absorbs heavy metals, and belongs to the technical field of natural polymer modified materials. Background technique [0002] Water pollution by heavy metal ions is a worldwide problem and has been a topic of global concern given that wastewater collected from communities and various industries must flow back to the sea or land. [1] . Heavy metal pollution in the water environment is caused by wastewater, waste gas, and waste residues discharged by many industries such as electroplating, mineral processing, and tanning; in addition, heavy metal pollution occurs in the soil, groundwater, and surface water near some military bases. The harmfulness of heavy metals to the environment is highlighted by the fact that they cannot be biodegraded, tend to accumulate in living organisms, and cause various diseases and dysfunctions, etc. [2] . The common heavy metal ions in waste...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C08F251/02C08F220/06C08F222/06C02F101/20
CPCB01J20/24C02F1/286C08F251/02B01J20/28047C02F2101/20C08F220/06C08F222/06
Inventor 李俊慧高欣韩全青
Owner KUNMING UNIV OF SCI & TECH
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