Environment-friendly oxidation type hydrophobic glucomannan adsorption material and preparation method thereof

A glucomannan, environmentally friendly technology, applied in the field of compositions containing glucomannan materials, can solve the problems of low adsorption capacity of heavy metal ions and radionuclides, non-reusable adsorbents, and weak adsorption capacity, etc. Achieve good hydrophilicity and mechanical strength, eliminate high water solubility and poor strength, and low cost

Inactive Publication Date: 2009-08-05
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The widely used adsorbent at home and abroad is activated carbon. Although activated carbon can adsorb many chemical substances, its adsorption capacity for heavy metal ions and radionuclides is small, generally only 30-40 mg/g, and regeneration is difficult.
The adsorption capacity of ion exchange resin is high, but it only has adsorption capacity for some specific ions, and it is difficult to regenerate and the price is high.
The price of natural zeolite and clay is cheap, but the adsorption capacity for heavy metal ions and radionuclides is low, generally less than 10mg/g
Moreover, the treatment of heavy metal and radionuclide wastewater with clay mineral materials has d

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022]Example 1: 20 parts of glucomannan was swollen in 50 parts of 50% methanol glucomannan swelling inhibitor mixed solution dissolved with 5 parts of sodium hydroxide in proportion by weight, and the temperature was controlled at 35° C. to remove Acetyl group and cross-linking reaction for 40 hours; filter, wash away swelling inhibitor and excess alkali, and dry at a temperature of 50°C for 24 hours to obtain hydrophobic glucomannan; swell 20 parts of hydrophobic glucomannan in Adjust the pH to 3 in 50 parts of water, add 1 part of potassium permanganate, and react for 24 hours; filter and wash, and dry at a temperature of 50° C. for 24 hours to obtain the oxidized hydrophobic glucomannan adsorption material.

Embodiment 2

[0023] Example 2: 25 parts of glucomannan was swelled in 80 parts of 60% ethanol glucomannan swelling inhibitor mixed solution with 10 parts of potassium hydroxide dissolved in the proportion by weight, and the temperature was controlled at 45° C. to remove Acetyl group and cross-linking reaction for 30 hours; filter, wash away swelling inhibitor and excess alkali, and dry at 60°C for 20 hours to obtain hydrophobic glucomannan; swell 30 parts of hydrophobic glucomannan in Adjust the pH to 4 in 70 parts of water, add 2 parts of potassium persulfate, and react for 18 hours; filter and wash, and dry at 60° C. for 20 hours to obtain the oxidized hydrophobic glucomannan adsorption material.

Embodiment 3

[0024] Embodiment 3: 30 parts of glucomannan are swelled in 100 parts of glucomannan swelling inhibitor mixed solution prepared by dissolving 20 parts of sodium hydroxide in 70% ethanol and 10% acetone by weight proportioning, control Deacetylation and crosslinking reaction at 60°C for 20 hours; filter, wash away swelling inhibitor and excess alkali, and dry at 70°C for 17 hours to obtain hydrophobic glucomannan; 40 parts of hydrophobic The glucomannan was swelled in 00 parts of water, the pH was adjusted to 5, 3 parts of sodium persulfate was added, and reacted for 14 hours; filtered and washed, and dried at a temperature of 60°C for 20 hours, the oxidized hydrophobic glucomannan adsorption material was obtained.

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Abstract

The invention relates to an environment friendly oxidation type hydrophobic glucomannan adsorption material and a method for preparing the same, and belongs to the technical field of compositions containing glucomannan materials. The adsorption material comprises the following components in portion by weight: 20 to 100 portions of glucomannan, 50 to 500 portions of 0 to 70 percent glucomannan swelling inhibitor, 5 to 100 portions of alkali, 50 to 500 portions of water, and 1 to 20 portions of oxidizing agent. The preparation method comprises that: the glucomannan is swelled in an alkali mixed solvent of the swelling inhibitor, and subjected to acetyl group removing reaction for 1 to 40 hours at a temperature of between 35 and 90 DEG C; the mixed solution is filtered and washed so as to remove the swelling inhibitor and the excessive alkali, and the obtained product is dried at a temperature of between 50 and 100 DEG C for 8 to 24 hours to obtain the hydrophobic glucomannan; the hydrophobic glucomannan is swelled in water, the pH value is adjusted to be 3 to 12, and then the oxidizing agent is added to hydrophobic glucomannan and reacts for 1 to 24 hours; and the obtained mixed solution is filtered, washed and dried at a temperature of between 50 and 100 DEG C for 8 to 24 hours to obtain the oxidation type hydrophobic glucomannan adsorption material. The material has higher selective adsorption capability on heavy-metal ions and radioactive nuclides, and can be widely applied to the adsorption and separation of the heavy-metal ions and radioactive nuclides generated in mining, mining and metallurgy, chemical industry, electroplating, machinery, nuclear industry, environmental protection and restoration, and the like.

Description

(1) Technical field [0001] The invention relates to an environmentally friendly oxidized hydrophobic glucomannan adsorption material and a preparation method thereof, belonging to the technical field of compositions containing glucomannan materials. (2) Background technology [0002] Heavy metal and radioactive wastewater mainly comes from mining, ore dressing, smelting, electroplating, chemical industry, machinery, tanning and nuclear industries. Wastewater containing heavy metals and radionuclides produced by these industries not only poses a threat to aquatic organisms when discharged into natural water bodies, but also poses a threat to aquatic organisms. And it may be continuously enriched through precipitation, adsorption and food chain, destroying the ecological environment, and ultimately endangering human health. [0003] Heavy metals and radionuclides are enriched and accumulated by biological uptake. The concentration of heavy metals and radionuclides accumulated...

Claims

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Application Information

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IPC IPC(8): B01J20/24
Inventor 罗学刚刘锋徐东龙晓燕
Owner SOUTHWEAT UNIV OF SCI & TECH
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