Method for improving water phase reaction recycling capability of bacterial cellulose-plant fiber composite paper-based catalyst

A bacterial cellulose and plant fiber technology, which is applied in catalytic reactions, carbon compound catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of affecting the recycling ability of paper-based catalysts and limiting the use range of paper-based catalysts , dissociation of fiber structure and other issues, to achieve good dispersion and stability, good reaction rate, and improved stability

Inactive Publication Date: 2019-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cellulose-based carrier structure of the paper-based catalyst has strong hydrophilicity, and the hydrogen bond between the fibers in water is destroyed, resulting in the dissociation of the fiber structure, which greatly affects the paper-based catalyst in the water phase. Recyclability in React
However, many catalytic reactions in chemical research and chemical production are carried out in the aqueous phase, thus limiting the scope of use of paper-based catalysts

Method used

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  • Method for improving water phase reaction recycling capability of bacterial cellulose-plant fiber composite paper-based catalyst
  • Method for improving water phase reaction recycling capability of bacterial cellulose-plant fiber composite paper-based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Cut 30 g of bacterial cellulose (BC) wet film into small pieces of 1 cm × 1 cm × 0.8 mm, and crush it 3 times in the instant mode with a laboratory mixer. The disintegrated BC and 60mL NaOH solution (1M) were mixed and poured into an Erlenmeyer flask, and activated by magnetic stirring at room temperature for 3h. Then acrylonitrile (0.30 mol, 20 mL) was slowly added dropwise under stirring, and the mixture was reacted at room temperature for 12 h. Afterwards, BC was isolated by filtration, washed thoroughly with deionized (DI) water, and then washed with 70% ethanol to obtain cyanoethyl surface-functionalized bacterial cellulose (CEBC). Afterwards the CEBC was dispersed in 50 mL of NaOH / NH 2 In OH·HCl (0.05mol, 1:1mol) aqueous solution, under magnetic stirring state, react at 50°C for 6h. After completing the reaction, separate by filtration and wash with deionized water to obtain amidoxime surface functionalized bacterial cellulose (AOBC).

[0033] HAuCl 4 (0.25 g)...

Embodiment 2

[0040] Cut 30 g of bacterial cellulose (BC) wet film into small pieces of 1 cm × 1 cm × 0.8 mm, and crush it 3 times in the instant mode with a laboratory mixer. Suspend the disintegrated BC in 100 mL of aqueous solution containing 0.48 g of 2,2,6,6-tetramethylpiperidine-nitrogen-oxide (TEMPO) and 3 g of sodium bromide, by adding NaClO (0.30 mol, 20 mL ) to start the reaction, stirred gently at room temperature, added 0.5M NaOH to maintain the pH value of the suspension at 10-10.3, and activated for 5h. The reaction was stopped by adjusting the pH to 7.0 with 0.5M HCl. After completing the reaction, wash with deionized water to obtain oxidized bacterial cellulose (TOBCN).

[0041] HAuCl 4 (0.25 g) was dissolved in 50 mL of deionized water at 4 °C and added to TOBCN, the mixture was stirred and reacted at room temperature for 1 h, then filtered and washed. With 100mL sodium borohydride solution (0.1M) to reduce BC for 1h, the Au 2+ After in situ reduction to Au nanoparticle...

Embodiment 3

[0046] Cut 30 g of bacterial cellulose (BC) wet film into small pieces of 1 cm × 1 cm × 0.8 mm, and crush it 3 times in the instant mode with a laboratory mixer. Soak the disintegrated BC in a mixture containing 40 mL of acetic acid, 25 mL of toluene, and 0.1 mL of 60% perchloric acid, and stir the mixture vigorously for 1 min. Then 60 mL of acetic anhydride was added, the mixture was vigorously stirred for 30 minutes, and the mixture was allowed to stand at room temperature for 1 hour. Then wash and filter with water to obtain acetate-esterified bacterial cellulose.

[0047] Add acetate-esterified bacterial cellulose to 100 mL of 0.2 M CuSO 4 In the solution, the reaction was stirred at room temperature at a speed of 350 rpm for 4 h. The resulting solid product was filtered and washed, and added to 60ml of sodium citrate (5 × 10 -2 In M), react at normal temperature for 1h, and reduce the copper ion loaded. The resulting copper nanoparticles-loaded BC (Cu-BC) was filtered...

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Abstract

The invention discloses a method for improving the water phase reaction circulation capability of a bacterial cellulose-plant fiber composite paper-based catalyst. In the method, a dispersant and a fiber cross-linking agent are added in the process of preparing the paper-based catalyst by compounding bacterial cellulose loaded with metal nanoparticles and plant fibers, so that the water phase reaction recycling capability of the paper-based catalyst is improved. The bacterial cellulose is cellulose secreted and synthesized by bacterial microorganisms. The metals are gold, copper, silver, palladium, chromium, nickel and other metals with catalytic properties. The dispersant is carboxymethyl cellulose, xylan, glucomannan, cationic etherified starch, polyethylene oxide, and the like. The fiber crosslinking agent is polyethyleneimine, polyacrylamide, polyvinyl alcohol, polyamide epichlorohydrin, and the like. The paper-based catalyst prepared by the invention has the advantages of extremely convenient use and recovery, high water phase recycling capability, extremely low metal particle leaching rate, good catalytic efficiency and the like.

Description

technical field [0001] The invention relates to the field of composite paper-based catalysts, in particular to a method for improving the water-phase reaction cycle capacity of bacterial cellulose-plant fiber composite paper-based catalysts. Background technique [0002] The paper-based catalyst prepared by compounding bacterial cellulose loaded with metal nanoparticles and plant fiber through the papermaking method has the advantages of extremely convenient use and recycling, simple design, low manufacturing cost, high catalytic efficiency, green and degradable carrier materials, etc. In addition, in It has excellent recycling ability in the catalytic reaction of organic phase. However, the cellulose-based carrier structure of the paper-based catalyst has strong hydrophilicity, and the hydrogen bond between the fibers in water is destroyed, resulting in the dissociation of the fiber structure, which greatly affects the paper-based catalyst in the water phase. Recycling cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J32/00C07C213/02C07C215/76C07C41/30C07C43/205C07C2/86C07C15/54C07C51/353C07C57/44
CPCB01J31/06B01J2231/4227B01J2231/4261B01J2231/4266B01J2231/641C07C2/861C07C41/30C07C51/353C07C213/02C07C2531/06C07C215/76C07C43/205C07C15/54C07C57/44
Inventor 吴潇项舟洋
Owner SOUTH CHINA UNIV OF TECH
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