MODIFICATION FOR Al_2O_3 MICROFILTRATION MEMBRANE WITH NANO-CRYSTALLINE ZnO COATING

作者：Jianer Zhou, Jianqing Wu · 年份：2004 · 被引用次数：1 · 研究领域：Membrane Separation Technologies、Electrospun Nanofibers in Biomedical Applications、Analytical Chemistry and Sensors

The α-Al_2O_3 microfiltration membrane modified by nano-erystalline ZnO coating was obtained by using zinc nitrate and urea as raw materials by homogeneous precipitation method. The effects of reaction temperature and coating times on the modification of the membrane were investigated. The mechanism of modification was also explored by means of TEM, FTIR, zeta electric potential analyzer etc. The results show that the α-Al_2O_3 microfiltration membrane modified by nano-crystalline ZnO coating are smooth and dense with the crystal sizes of 5—10 nm and the water flux of modified membrane are raised by 43%. It is found that charge of the coating modified by nano-ZnO coating is the key factor that leads to the increase of water flux. In addition, hydrophobic, smooth and dense performances of the modified coating have certain effects on the increase of water flux.