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A kind of regenerated cellulose pellet containing flaky nano ZNO and its preparation method

A technology for regenerating cellulose and cellulose fibers, used in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc. problems such as poor friendliness, to achieve the effect of clean and environmentally friendly preparation process, improving high-value utilization, and improving difficult recycling

Active Publication Date: 2020-08-18
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, commonly used inorganic carriers include silica, diatomaceous earth, alumina, carbon materials, etc. Inorganic carriers have the characteristics of high density (generally only suitable for fixed bed reactors), which limits their application in photocatalytic engineering; Organic polymer carriers include polyethylene, etc., which have a low density and are not only suitable for fixed-bed reactors, but also for suspended-bed reactors. However, petroleum-based polymers are not easy to degrade and regenerate, and have poor environmental friendliness. Usage requirements

Method used

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  • A kind of regenerated cellulose pellet containing flaky nano ZNO and its preparation method
  • A kind of regenerated cellulose pellet containing flaky nano ZNO and its preparation method
  • A kind of regenerated cellulose pellet containing flaky nano ZNO and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0027] 2g of wood pulp cellulose fibers were added to 100g of 65% (wt%) ZnCl 2 In aqueous solution, pretreatment in a low-temperature bath at 0°C for 3 hours. The above liquid-solid material was placed in a water bath at 60° C. and heated and stirred to obtain a transparent and uniform cellulose solution. Use a syringe to dissolve the ZnCl of cellulose 2 The aqueous solution was injected into a 50% NaOH aqueous solution in the form of pellets, and left to stand for 24 hours. Filter the pellet and wash the pellet with distilled water to be free of C1 - , put it in an ultra-low temperature refrigerator, and put the sample in a freeze dryer after freezing. After drying, a new material of regenerated cellulose pellets containing flaky nano-ZnO was obtained. The characterization results are as follows Figure 1~5 shown. Depend on figure 1 It can be seen that the diameter of the pellets is 2-4 mm. Depend on figure 2 It can be seen that the surface of the pellet is network-li...

Embodiment 2

[0029] 2g of wood pulp cellulose fibers were added to 80g of 65% (wt%) ZnCl 2 In aqueous solution, pretreatment in a low-temperature bath at -10°C for 4 hours. The above liquid-solid material was placed in a water bath at 70° C. and heated and stirred to obtain a transparent and uniform cellulose solution. Use a syringe to dissolve the ZnCl of cellulose 2 The aqueous solution was injected into a 50% NaOH aqueous solution in the form of pellets, and left to stand for 26 hours. Filter the pellet and wash the pellet with distilled water until Cl-free - , put it in an ultra-low temperature refrigerator, and place the sample in a freeze dryer after freezing. After drying, a new material of regenerated cellulose pellets containing flaky nano ZnO is obtained. The diameter of the small ball is 2-4mm, and the thickness of the ZnO nanosheet is about 20-50nm.

Embodiment 3

[0031] 2g bamboo pulp cellulose fiber is added to the ZnCl of 60g 70% (wt%) 2 In aqueous solution, pretreatment in a low-temperature bath at 20°C for 4 hours. The above liquid-solid material was placed in a water bath at 60° C. and heated and stirred to obtain a transparent and uniform cellulose solution. Use a syringe to dissolve the ZnCl of cellulose 2 The aqueous solution was injected into a 50% NaOH aqueous solution in the form of pellets, and allowed to stand for 18 hours. Filter the pellet and wash the pellet with distilled water until Cl-free - , put it in an ultra-low temperature refrigerator, and place the sample in a freeze dryer after freezing. After drying, a new material of regenerated cellulose pellets containing flaky nano ZnO is obtained. The diameter of the small ball is 2-4mm, and the thickness of the ZnO nanosheet is about 20-50nm.

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Abstract

The invention discloses a regenerated cellulose pellet containing flake nano-ZnO and a preparation method thereof. The new material of regenerated cellulose beads has a thickness of ZnO nanosheets of 20 to 50 nm and a diameter of regenerated cellulose beads of 2 to 4 mm. This preparation method uses ZnCl 2 The aqueous solution serves as a solvent for cellulose and a zinc source for nano-ZnO. It dissolves cellulose fibers into cellulose raw materials. Through low-temperature pretreatment, dissolution, injection into balls, in-situ synthesis and freeze-drying, the regeneration of nano-ZnO containing flakes is prepared. Cellulose pellets. The material is easy to recycle and has great practicality.

Description

technical field [0001] The invention belongs to the technical field of new cellulose materials, and in particular relates to a new material of regenerated cellulose pellets containing flaky nano ZnO and a preparation method thereof. Background technique [0002] Compared with traditional sewage treatment technology, photocatalytic technology has the advantages of high efficiency, energy saving, easy operation, simplified process, clean and non-toxic, and no secondary pollution. Some commonly used photocatalytic materials are mainly semiconductor materials, and nano-ZnO is one of the materials with broad application prospects. However, it is difficult to recycle in application, so it needs to be compounded with a certain carrier to improve its utilization efficiency. [0003] At present, commonly used inorganic carriers include silica, diatomaceous earth, alumina, carbon materials, etc. Inorganic carriers have the characteristics of high density (generally only suitable for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26B01J35/08C02F1/32
CPCC02F1/32B01J31/26C02F2305/10B01J35/39B01J35/51
Inventor 李小保周小龙高亚年张雪李力成叶菊娣
Owner NANJING FORESTRY UNIV
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