A kind of graphite oxide composite film with high moisture permeability and high hydrophobicity and preparation method thereof
A composite membrane and graphite technology, applied in chemical instruments and methods, separation methods, semi-permeable membrane separation, etc., can solve the problems of low permeability of porous membranes, poor hydrophobic effect of porous membranes, etc., and achieve low reagent cost and good seawater. Dilute the application prospect and the effect of simple preparation process
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Embodiment 1
[0032] The preparation of high moisture-permeable and highly hydrophobic graphite oxide (GO) specifically comprises the following steps:
[0033] (1) Place the glass substrate in an ultrasonic cleaning machine to clean it, and then use acetone, ethanol and deionized water to remove the surface oil by ultrasonication at a frequency of 100 Hz for 10 min, and dry it for later use; polyvinylidene fluoride (5wt .%) solution was coated on a glass substrate to obtain a template, and then soaked in 6 mol / L NaOH solution at 40°C for 6 h to obtain a hydrophilic polymeric film for use;
[0034] (2) Add 5 g of natural flake graphite powder and 2 g of sodium nitrate to 400 mL of concentrated sulfuric acid in an ice-water bath, then add 9 g of potassium permanganate and stir for 6 h, and slowly add 150 mL of distilled water to the above solution And stirred at 60°C for 4h. Finally add 10 mL of 30% H 2 o 2 solution to terminate the above reaction. The obtained solution was washed 2-3 tim...
Embodiment 2
[0042] The preparation of high moisture permeability and high hydrophobic graphite oxide (GO) composite membrane specifically includes the following steps:
[0043] (1) Place the glass substrate in an ultrasonic cleaning machine to clean it, and then use acetone, ethanol, and deionized water to remove surface oil by ultrasonication at a frequency of 100 Hz for 20 min, and dry it for later use; polypropylene (10 wt. %) solution coated on a glass substrate to obtain a template, and then soaked in 3 mol / L soda aqueous solution at 60 °C for 8 h to obtain a hydrophilic polymeric film, ready for use;
[0044] (2) Add 2 g of natural flake graphite powder and 5 g of sodium nitrate to 400 mL of concentrated sulfuric acid in an ice-water bath, and add 12 g of potassium permanganate to stir for 8 h, slowly add 250 mL of distilled water to the above solution and Stir at 40 °C for 6 h. Finally add 5 mL of 30% H 2 o 2 solution to terminate the above reaction. The obtained solution was w...
Embodiment 3
[0049] The preparation of high moisture permeability and high hydrophobic graphite oxide (GO) composite membrane specifically includes the following steps:
[0050] (1) Place the glass substrate in an ultrasonic cleaning machine to clean it, and then use acetone, ethanol and deionized water to remove surface oil by ultrasonication at a frequency of 100 Hz for 15 min, and dry it for later use; polytetrafluoroethylene (15 wt.%) solution was coated on the glass substrate to obtain a template, and then soaked in 5 mol / L KOH solution at 80 ℃ for 4 h to obtain a hydrophilic polymeric film, ready for use;
[0051] (2) Add 5 g of natural flake graphite powder and 3 g of sodium nitrate to 400 mL of concentrated sulfuric acid in an ice-water bath, add 15 g of potassium permanganate and stir for 3 h, slowly add 300 mL of distilled water to the above solution and Stir at 50 °C for 7 h. Finally add 3 mL of 30% H 2 o 2 solution to terminate the above reaction. The obtained solution was ...
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