Method for preparing nanometer ZnO cellulose composite based on NaOH/urea solution by using direct precipitation process, and application of nanometer ZnO cellulose composite

A composite material and cellulose technology, applied in the field of nano-ZnO cellulose composite materials, can solve the problems of difficult wide application and high cost of ionic liquids, and achieve the effect of simple method, simple and easy equipment, and good practicability

Inactive Publication Date: 2017-02-01
NANJING FORESTRY UNIV
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  • Application Information

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Problems solved by technology

Bagheri et al. dissolved cellulose in 1-butyl-3-methylimidazolium chloride [C 4 mim]Cl prepared cellulose-ZnO nanocomposites, but the ionic liquids they used were too expensive to be widely used

Method used

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  • Method for preparing nanometer ZnO cellulose composite based on NaOH/urea solution by using direct precipitation process, and application of nanometer ZnO cellulose composite
  • Method for preparing nanometer ZnO cellulose composite based on NaOH/urea solution by using direct precipitation process, and application of nanometer ZnO cellulose composite
  • Method for preparing nanometer ZnO cellulose composite based on NaOH/urea solution by using direct precipitation process, and application of nanometer ZnO cellulose composite

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Experimental program
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Effect test

Embodiment 1

[0023] Take 50g of NaOH / Urea aqueous solution (NaOH:Urea:H 2 The mass ratio of O is 7︰12︰81), add 2g microcrystalline cellulose, stir rapidly until dissolved, add 1mol / L ZnCl dropwise 2 Solution 30mL, after stirring and aging for 30min, with 2% H 2 SO 4 Adjust the pH value of the solution to 9, reflux at 90°C for 2 hours, take it out and wash it with distilled water until there is no Cl - , dried in an oven at 70°C and weighed to obtain a nano-ZnO cellulose composite material.

[0024] The prepared nano-ZnO cellulose composites were characterized as follows:

[0025] Electron micrographs of the prepared nano-ZnO cellulose composites are as follows: figure 1 As shown, the infrared image is shown as figure 2 As shown, TG as image 3 As shown, the XRD pattern is as Figure 4 . It can be seen from the electron microscope that ZnO gathers on the surface of cellulose in the form of nanosheets, and the infrared image is 472cm -1 The wave number is the characteristic peak of...

Embodiment 2

[0026] Photodegradation performance of embodiment 2 ZnO cellulose nanocomposites to methylene blue wastewater

[0027] Get the methylene blue solution (30mg / L, 40mg / L, 50mg / L, 60mg / L) of 100mL different initial concentrations in the 250mL quartz beaker, add ZnO / cellulose composite material 0.1g obtained in the embodiment 1, Stir on a magnetic stirrer, after stirring in the dark for 30min, under the irradiation of ultraviolet light and sunlight, take samples and analyze the concentration of methylene blue in the solution at regular intervals, stir for 4 hours altogether, and the removal rates of methylene blue after 4 hours are respectively 69.73%, 65.78%, 62.96%, 60.07%. (Concentration of methylene blue in the control sample ZnO and cellulose is 50mg / L, other conditions are unchanged)

[0028] The concentration of methylene blue was obtained by measuring the absorbance at 664 nm with a UV-visible spectrophotometer according to the methylene blue standard curve.

[0029] The ...

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Abstract

The invention discloses a method for preparing a nanometer ZnO cellulose composite based on a NaOH/urea solution by using a direct precipitation process, and application of the nanometer ZnO cellulose composite. The nanometer ZnO cellulose composite is prepared in a cellulose solution of NaOH/urea through in-situ compounding via the direct precipitation process. According to the preparation method, after dissolving of cellulose, a hydroxyl group on the molecule of cellulose bonds with zinc ions, which is beneficial for uniform distribution of ZnO in cellulose; the method is simple; the solvent, i.e., the NaOH/urea solution, is cheap and easily available; and equipment used in the invention is simple and easily practicable. The nanometer ZnO cellulose composite contains 57% of ZnO, has high removal efficiency on methylene blue in photodegradation of dye wastewater, and is cheap and environment-friendly; and when used as a photodegradatic catalyst, the nanometer ZnO cellulose composite has good practicality in treatment of methylene blue wastewater.

Description

technical field [0001] The invention belongs to the technical field of nano-ZnO cellulose composite materials, and in particular relates to a method and application for preparing nano-ZnO cellulose composite materials by direct precipitation method based on NaOH / urea solution. Background technique [0002] Zinc oxide (ZnO) is an important wide-bandgap semiconductor functional material. The bandgap at room temperature is 3.37eV. Its chemical and physical properties are quite stable. It has special thermal conductivity and electrical conductivity. Its exciton binding energy is as high as 60meV. Much higher than GaN and ZnSe, ZnO, as a semiconductor material, has good application value. Nano-ZnO powder has excellent antibacterial, photocatalytic and adsorption properties, but the traditional single nano-ZnO is easy to agglomerate and difficult to recycle for secondary use. The preparation of supported ZnO composite materials can not only solve the disadvantage of poor stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26C02F1/30
CPCB01J31/26B01J35/004C02F1/30C02F2101/308C02F2305/10
Inventor 叶菊娣李小保洪建国
Owner NANJING FORESTRY UNIV
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