CPC C02F 1/44 (2013.01) [B01D 69/1213 (2022.08); B01D 71/281 (2022.08); B01D 71/421 (2022.08); B01J 23/745 (2013.01); B01J 37/08 (2013.01); B01J 37/32 (2013.01); C02F 2101/30 (2013.01)] | 4 Claims |
1. An application method of a gradient long-effective catalytic membrane with high-strength and anti-deposition property in conversion of organic pollutants, comprising the following steps:
adding a nanometal oxide catalyst into an N,N-dimethylformamide solution of one of polyacrylonitrile and polystyrene and then uniform mixing to obtain a mixture solution;
performing electrostatic spinning on the mixture solution to obtain a precursor membrane of the catalytic membrane; wherein a receiver is at a temperature in a range of −190° C. to −200° C. during the electrostatic spinning; and
performing freeze-drying on the precursor membrane of the catalytic membrane obtained after the electrostatic spinning is finished to obtain the gradient long-effective catalytic membrane with high-strength and anti-deposition property;
wherein a preparation method of the nanometal oxide catalyst comprises the following steps:
depositing one of iron acetylacetonate, copper acetylacetonate and chromium acetylacetonate in a protective atmosphere to obtain a nanometal catalyst precursor; and
roasting the nanometal catalyst precursor in air to obtain the nanometal oxide catalyst;
wherein a mass ratio of the nanometal oxide catalyst to the one of polyacrylonitrile and polystyrene is 1˜3 : 2.5˜5;
wherein conditions of the electrostatic spinning are as follows: a voltage is in a range of +10 kV to +17 kV and another voltage is in a range of −2 kV to −4 kV, a distance between the receiver and a needle is in a range of 5 cm to 7 cm, and a time of the electrostatic spinning is in a range of 30 min to 60 min; and the receiver is placed in a low-temperature control device, and the low-temperature control device is configured to control temperature by adjusting a volume of liquid nitrogen.
|