Study on Preparation of GO / PVDF Composite Fiber Films by Electrostatic Spinning for Air Filtration

• Main Authors: HAU-WEN TSAI, 蔡浩文
• Other Authors: YU-SHU CHIAN
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/89j44r

碩士 === 國立勤益科技大學 === 化工與材料工程系 === 105 === People pay attention air quality which is always one of the problem, in the times of present the rapid development of industry, there isn’t always efficient solution with plant emissions and air pollution from transportation , air filter material is faced with the ability to filter dust today , filtering the tiny suspended particles to reduce the pore size of the filter material, but often cause the air flux becomes smaller, resulting in a large tensile strength of the air filter material in order to load the air through the gas flow. In this study, using electrospinning technology prepared polymer fiber membrane, the prepared fibers are stacked near the holes of the nanometer level, and the use of parameter adjustment, increasing the fluffy degree of the fiber membrane, so that the air flux to improve, in order to cope with the problem that the air flux caused by filtering the suspended particles to reduce the aperture is too small, and the ability to filter PM2.5 up to 98%, the ability to filter PM1 is also about 60%. In this study, graphene / poly (vinylidene fluoride) thin films were prepared by simple electrostatic spinning technique which was combined with Hummer's method. First, the preparation of graphene oxide, the scale graphite and sulfuric acid mixed, slowly adding potassium permanganate made the graphene oxidize, so that the oxygen-containing groups into the graphite and graphite layer, and then add hydrogen peroxide to terminate the reaction, finally the use of ultrasonic shocks to separate less defective graphene, in order to verify the quality of graphene oxide, Raman analysis was used to observe the defects of graphene oxide, the surface morphology of graphene oxide was observed by field emission scanning electron microscopy. The results show that the use of Hummer's method for the preparation of graphene oxide, the oxidation time in eight hours have the best effect. In this study, an electrospinning solution was prepared to change the ratio of different solvents, adjusting the concentration of electrospinning solution and viscosity, the effects of the concentration and viscosity of the electrospinning solution on the fiber structure which was prepared by electrospinning were further investigated. It’s showed that it was found that a higher concentration and viscosity would increase the fiber diameter, and increase the generation of fiber balls. After finding the better electrospinning parameters, compared with the addition of graphene oxide content to adjust the impact of conductivity. After comparing, a higher conductivity will make fiber diameter drop. Field emission scanning electron microscopy was used to observe the fiber surface morphology, viscometer was detected of polymer viscosity of electrospinning, and four-point probe was measured the conductivity of polymer electrospinning. After adjusting the main parameters of electrospinning, the polymer fiber membrane with the best fiber morphology was prepared. After addition of graphene oxide, a fibrous film was prepared. The above-mentioned film air flow rate and the filtered particle size analysis were examined with a simple ventilator, determining the filtration capacity of the fiber membrane, the fiber membranes are prepared with chemically resistant polyvinylidene fluoride, it is not susceptible to environmental ,temperature and the effects of chemical by itself , that could increase the versatility of fiber film.