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

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...

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 difficulties in solid-liquid separation, the adsorbent cannot be reused, and it is easy to cause secondary pollution, etc.

To this end, many researchers are committed to the research and development of new adsorption materials. In recent years, the adsorption research on natural biomass for heavy metal ions and radionuclides is very active. Natural biomass such as microorganisms, chitosan and agricultural solid waste There have been many research reports on the adsorption of heavy metal ions and radionuclides in water, but the adsorption capacity of these substances is not strong, and they have no definite shape, and there are still many defects in industrial application.