Methods for preparation of nano cellulose composite aerogel adsorbent and adsorption of heavy metal ions

A technology of nano-cellulose and composite airgel, which is applied in separation methods, alkali metal compounds, chemical instruments and methods, etc., and can solve problems that do not involve cyclic freezing-thawing-freezing gel methods and unreported shapes of airgel Reply to problems such as performance, achieve the effect of easy process control, simple preparation method, efficient desorption and regeneration

Inactive Publication Date: 2019-02-01
NANJING FORESTRY UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above-mentioned methods for preparing aerogels involves the cyclic freezing-thawing-freezing gel method, and the prepared aerogels have not been reported to have shape recovery properties in aqueous solution.

Method used

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  • Methods for preparation of nano cellulose composite aerogel adsorbent and adsorption of heavy metal ions
  • Methods for preparation of nano cellulose composite aerogel adsorbent and adsorption of heavy metal ions
  • Methods for preparation of nano cellulose composite aerogel adsorbent and adsorption of heavy metal ions

Examples

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Effect test

Embodiment 1

[0038] Disperse 10g (dry weight) coniferous pulp plate in 500mL water, add 0.16g 2,2,6,6-tetramethylpiperidine-nitrogen-oxide and 1.6g sodium bromide at the same time, mix well and add 120mLNaClO Solution, mechanically stirred at room temperature, adjusted and controlled to pH 10.5 by 0.2mol / L NaOH solution, when the pH of the reaction mixture no longer increased, the reaction was stopped, and the resulting nanocellulose was acidified with 0.1mol / L HCl solution Vacuum filter and wash to neutral. The pH of the washed nanocellulose was adjusted to 10, ultrasonically dispersed in deionized water, and the concentration of the solution was adjusted to 1.0 wt%.

[0039] Put 24g of 1.0wt% nanocellulose solution and 0.96g of 25wt% polyethyleneimine aqueous solution in a specific mold, add water to dilute to 30mL, and stir mechanically rapidly for 0.5h to disperse evenly. Freeze at -20°C for 12 hours in the refrigerator, let it stand at room temperature for 4 hours, and put it back in...

Embodiment 2

[0045] Fully bleached coniferous wood will be pulverized in a pulverizer and crossed a 20-mesh sieve, and the obtained cellulose powder (50.0g) is added to 500mL 64wt%H 2 SO 4 , heated to 45°C under stirring for 45 minutes, then added 10 times deionized water to dilute to terminate the reaction. The mixture was centrifuged at 5000rpm for 10min, and the supernatant was removed. The resulting precipitate was redispersed in deionized water and dialyzed with a regenerated cellulose membrane with a molecular weight cut-off of 12000-14000 for 7 days until the pH value remained unchanged. The dialyzed mixed solution was ultrasonically dispersed in an ice-water bath for 30 min, and the obtained sulfonic acid cellulose nanocrystal dispersion was treated with a mixed bed ion exchange resin, adjusted to a concentration of 2 wt%, and stored in a refrigerator at 5°C.

[0046] Put 24g of 2wt% sulfonic acid cellulose nanocrystal solution and 1.2g of 10wt% urea-formaldehyde resin in a specif...

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Abstract

The invention relates to methods for preparation of a nano cellulose composite aerogel adsorbent and adsorption of heavy metal ions, and belongs to the technical fields of macromolecules, biomass materials and chemical crossing. In an aqueous solution, nano cellulose is mixed with a macromolecular polymer with strong humidification properties, and a structure of a hydrogel is regulated by means ofcircular freezing, thawing and freezing; the aerogel with shape recovery properties can be obtained by freeze drying, and is used as an adsorbent to remove heavy metal ions efficiently. The rapid andefficient deadsorption and regeneration of the aerogel adsorbent can be achieved by means of circular extrusion, absorption and displacement and extrusion, and the aerogel can be repeatedly applied to adsorption and removal of the heavy metal ions. The used raw materials belong to environmental friendly green material, and are safe, non-toxic and degradable. The method for preparation of the adsorbent is simple, the process is easy to control, and the adsorbent has shape recovery property in an aqueous solution, can be quickly and efficiently desorbed and regenerated, can be reused for many times, and has wide application prospects in the field of wastewater treatment.

Description

technical field [0001] The invention discloses a preparation method of a nano-cellulose composite airgel adsorbent and a method for adsorbing heavy metal ions, and belongs to the cross-technical fields of macromolecules, biomass materials and chemistry and chemical engineering. Background technique [0002] With the increase of population and the acceleration of industrialization, heavy metals have become one of the most dangerous and widespread water pollutants in the world today, and are a serious problem facing human society today. For example, even at extremely low concentrations, lead can cause aggregation, damage and even multiple organ failure in humans. At present, the treatment methods of heavy metal ions in wastewater mainly include chemical reduction precipitation method, ion exchange method, flocculation method, membrane filtration method and adsorption method. Among the above methods, the adsorption method is considered to be the easiest to implement and the lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B01J20/34C02F1/28C02F101/20
CPCB01J20/24B01J20/26B01J20/28047B01J20/3475C02F1/288C02F2101/20
Inventor 吴伟兵左克曼李建戴红旗
Owner NANJING FORESTRY UNIV
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