A study on filtration performance of titanium dioxide nanoparticle solution in inorganic tubular membrane.

• Main Authors: Che-Wei Lin, 林哲緯
• Other Authors: Tung-Wen Cheng
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/16085786612335351600

碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 97 === In this study, the ceramic membranes were employed in a cross-flow filtration system to investigate the flux enhancement of the titanium dioxide nanoparticle solution. The parameters of experiment included pH value, concentration, transmembrane pressure, liquid velocity, gas velocity, and membrane inclination angle. By the experimental study, the method for improving the performance of filtration of the titanium dioxide nanoparticle solution can be obtained. At the isoelectric point (pH=7), the titanium dioxide particles coagulate and form the larger particles, its migration is effected easily by the shear stress. By increasing the liquid or gas flow rate, the coagulated particles can be disturbed significantly. Therefore, the permeate flux of the filtration of titanium dioxide suspension at pH=7 can be enhanced apparently by increasing the shear stress. Relatively, the influences of transmembrane pressure or membrane inclination is not obvious on the permeate flux. It is noted that the operation with gas-liquid two-phase flow is an effective way to enhance the permeate flux. In the range of 0.1 to 0.5 m/s liquid velocity and 0.05 to 0.3 m/s gas velocity, the optimal condition for improving the flux is 0.5 m/s liquid velocity and 0.3 m/s gas velocity at pH=5, while 0.3 m/s liquid velocity and 0.3 m/s gas velocity for pH=7. At pH=5, the permeate flux is mainly affected by the total velocity. The higher total velocity, the higher permeate flux is obtained. At pH=7, the permeate flux is affected not only by the total velocity but also by the injection factor. Presented work implies that the best flux enhancement occurs at the 0.5 injection factor.