Bacterial cellulose-inorganic nanoparticle hybrid membrane and preparation method thereof

A technology of inorganic nanoparticles and bacterial cellulose, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as high energy consumption and environmental pollution, achieve mild synthesis conditions, simple synthesis process, good The effect of applying the foreground

Active Publication Date: 2011-04-13
南通诚恩机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method has the advantages of simplicity, cleanness, non-toxicity, and environmental friendliness, and better solves the problems existing in physical and chemical synthesis methods such as high energy consumption, environmental pollution, and cytotoxicity.

Method used

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  • Bacterial cellulose-inorganic nanoparticle hybrid membrane and preparation method thereof
  • Bacterial cellulose-inorganic nanoparticle hybrid membrane and preparation method thereof
  • Bacterial cellulose-inorganic nanoparticle hybrid membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Test strain: Glucoacetobacter xylinum 1.1812, purchased from Institute of Microbiology, Chinese Academy of Sciences

[0023] 2. Test method

[0024] Slant medium: glucose 100g, yeast powder 10g, calcium carbonate 20g, agar 20g, deionized water 1000mL, pH value 6.8, sterilized at 121°C for 20min.

[0025] Seed medium: 2% glucose, 0.5% peptone, 0.5% yeast powder, 0.68% disodium hydrogen phosphate dodecahydrate, 0.12% citric acid monohydrate, 0.50% magnesium sulfate heptahydrate, pH 6.0, sterilized at 121°C for 20 minutes .

[0026] Fermentation Medium: The fermentation medium has the same composition as the seed medium.

[0027] With a 10% inoculation amount, the well-grown seed culture solution was inserted into an Erlenmeyer flask containing 100 mL of Acetobacter xylinum fermentation culture solution, and then 4 g of titanium precursor—di(2-hydroxypropionic acid) dihydrogen dihydroxide was added. The 50% aqueous solution of ammonium titanium, in a biochemical incu...

Embodiment 2

[0030] 1. The test bacterial classification and medium formula are the same as in Example 1

[0031] 2. Test method

[0032] TiO 2 Sol preparation

[0033] Add 5mL of titanium precursor—a 50% aqueous solution of di(2-hydroxypropionic acid) diammonium titanium hydroxide and 25mL of deionized water into the hydrothermal kettle, heat it to 140°C in a muffle furnace, and keep the temperature at 24°C. hours, and then naturally cooled to room temperature to obtain TiO 2 Sol.

[0034] 4mL TiO obtained by hydrothermal synthesis 2 The sol was added to an Erlenmeyer flask filled with 100 mL of medium, and then 10 mL of seed culture solution that had been cultivated for 2 days was added, and cultured in a biochemical incubator at 30°C for 7 days. The cultured basement membrane was taken out and washed with deionized water until milky white, so as to remove the remaining medium and water-soluble polysaccharides. Then, it was soaked in 1% NaOH solution for 48 hours to remove the bact...

Embodiment 3

[0037] The preparation process is the same as in Example 1, except that di(2-hydroxypropionic acid) diammonium hydroxide titanium is replaced by sodium silicate solution, and the concentration of sodium silicate in the medium is 1 mg / mL, and finally bacterial cellulose- SiO 2 nanohybrid film.

[0038] SEM analysis showed that the diameter of the bacterial filaments was in the range of 60-120nm, a dense network bifurcation structure was formed between the filaments, and a microporous structure was formed between the filaments, and the pore size of the microporous structure was 0.2-2 μm. Sodium silicate is added to the medium to obtain SiO with a diameter of about 30-60nm after mineralization by bacteria 2 Most of the particles are attached to the filaments of bacterial cellulose, and only a small amount of nanoparticles are embedded in the bacterial cellulose matrix.

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Abstract

The invention relates to a biosynthesis method for preparing a bacterial cellulose-inorganic nanoparticle hybrid membrane by using microbes. The first preparation method comprises the following steps of: culturing acetobacter xylinum in a liquid nutrient medium added with titanate dihydroxybis[2-hydroxypropanoato-O1,O2]diammonium, and purifying to prepare a bacterial cellulose-TiO2 nano hybrid membrane; the second preparation method comprises the following steps of: hydrothermally decomposing titanate dihydroxybis[2-hydroxypropanoato-O1,O2]diammonium to synthesize TiO2 colloidal particles, and adding the colloidal particles into a nutrient medium, culturing acetobacter xylinum in the nutrient medium, and purifying to prepare the bacterial cellulose-TiO2 nano hybrid membrane; and the thirdpreparation method comprises the following steps of: culturing acetobacter xylinum in a liquid nutrient medium added with sodium silicate or silicic acid, and purifying to prepare the bacterial cellulose-TiO2 nano hybrid membrane. The method has the advantages that: the preparation method is simple, clean, non-toxic and environmentally-friendly, and can solve the problems of high energy consumption, environmental pollution, cytotoxicity and the like in physical and chemical preparation methods.

Description

technical field [0001] The invention relates to the preparation technology of organic-inorganic nanometer hybrid materials, in particular to a bacterial cellulose-inorganic nanoparticle hybrid membrane and a preparation method. Background technique [0002] Both organic and inorganic membranes have their own advantages and disadvantages. In order to improve the performance of a single membrane material, the preparation of organic-inorganic hybrid membranes by introducing inorganic components into organic components is one of the cost-effective methods. The introduction of inorganic components can not only improve the mechanical strength, thermal stability, and solvent resistance of the hybrid membrane, but also the unique physical and chemical properties of inorganic particles can also be reflected in the hybrid membrane. At present, organic-inorganic hybrid membranes have been widely used in the fields of gas separation, pervaporation, reverse osmosis, ultrafiltration, fue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/10B01D67/00
Inventor 姜忠义杨冬耿家青史莹
Owner 南通诚恩机械有限公司
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