Method for preparing modified nano TiO2-loaded polyhydroxybutyrate valerate (PHBV) membrane by solution pouring method
A solution casting and nanotechnology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problems of lack of functional utilization and unsatisfactory dispersion, and achieve Promote nucleation growth and diffusion, increase photocatalytic performance, and realize the effect of modification
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Embodiment 1
[0023] First, 20 g of butyl titanate and 30 g of isopropanol were used to form a solution A; 4.6 g of tetramethylammonium hydroxide (TMAOH) and 76 ml of water were added to another flask to form a B solution. Slowly add solution A to solution B dropwise at room temperature while heating and stirring, and boil for 2 hours until the initial white turbid colloidal suspension turns into a translucent solution. When the amount of the colloidal solution is reduced to close to 40mL, add another 40mL of water, continue to boil, transfer the solution to a polytetrafluoroethylene-lined reactor, and conduct a hydrothermal reaction at 150°C for 2h to obtain nano-sized TMA-TiO 2 The clear and transparent solution of C. For TiO in solution 2 The powder was tested by XRD, the results are as follows figure 1 , with anatase TiO 2 The standard characteristic peaks (JCPDF: 21-1272) are very consistent; the UV-visible transmission spectrum is tested in the above solution, such as figure 2 In...
Embodiment 2
[0027] First, 50 g of isopropyl titanate (IV) and 60 g of isopropanol were used to form a solution A; 10.0 g of tetrabutylammonium hydroxide (TBAOH) and 120 ml of water were added to another flask to form a B solution. Slowly add solution A to solution B dropwise at room temperature while heating and stirring, and boil for 4 hours until the initial white turbid colloidal suspension turns into a translucent solution. When the amount of the colloidal solution is reduced to close to 80mL, add another 80mL of water, continue to boil, transfer the solution to a polytetrafluoroethylene-lined reactor, and conduct a hydrothermal reaction at 250°C for 4h to obtain nano-sized TBA-TiO 2 The clear and transparent solution of C. Test the UV-visible transmission spectrum in the above solution, such as figure 2 In the middle curve B, the cut-off of the ultraviolet band is around 330nm. In the wavelength range of visible light, the transmittance gradually increases from 80%, and the highest...
Embodiment 3
[0031] Use 20g isopropyl titanate, 20g butyl titanate and 50g isopropanol to form a solution A; add 4.0g TBAOH, TMAOH and 120ml water to another flask to form a B solution. Slowly add solution A to solution B dropwise at room temperature while heating and stirring, and boil for 3 hours until the initial white turbid colloidal suspension becomes a translucent solution. When the amount of the colloidal solution is reduced to close to 60mL, add another 60mL of water, continue to boil, transfer the solution to a polytetrafluoroethylene-lined reaction kettle, and conduct a hydrothermal reaction at 200°C for 3h to obtain nano-sized TBA-TMA -TiO 2 The clear and transparent solution of C. Test the UV-visible transmission spectrum in the above solution, such as figure 2 In the middle curve C, the cut-off of the ultraviolet band is around 340nm, and the transmittance gradually increases from 60% in the wavelength range of visible light.
[0032] 0.5 g of PHBV containing 12.1% by mol...
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