College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China; Institute of Medical Equipment, Academy of Military Medical Sciences, Tianjin 300161, China.
Institute of Medical Equipment, Academy of Military Medical Sciences, Tianjin 300161, China.
J Hazard Mater. 2016 Dec 15;320:495-503. doi: 10.1016/j.jhazmat.2016.08.068. Epub 2016 Aug 30.
A novel microporous nano-MgO/diatomite ceramic membrane with high positive surface charge was prepared, including synthesis of precursor colloid, dip-coating and thermal decomposition. Combined SEM, EDS, XRD and XPS studies show the nano-MgO is irregularly distributed on the membrane surface or pore walls and forms a positively charged nano coating. And the nano-MgO coating is firmly attached to the diatomite membrane via SiO chemical bond. Thus the nano-MgO/diatomite membrane behaves strong electropositivity with the isoelectric point of 10.8. Preliminary filtration tests indicate that the as-prepared nano-MgO/diatomite membrane could remove approximately 99.7% of tetracycline in water through electrostatic adsorption effect. The desirable electrostatic property enables the nano-MgO/diatomite membrane to be a candidate for removal of organic pollutants from water. And it is convinced that there will be a great application prospect of charged ceramic membrane in water treatment field.
一种新型的具有高正表面电荷的微孔纳米 MgO/硅藻土陶瓷膜是通过前驱体胶体的合成、浸涂和热分解制备的。SEM、EDS、XRD 和 XPS 的综合研究表明，纳米 MgO 不规则地分布在膜表面或孔壁上，并形成带正电荷的纳米涂层。纳米 MgO 涂层通过 SiO 化学键牢固地附着在硅藻土膜上。因此，纳米 MgO/硅藻土膜表现出强正电性，等电点为 10.8。初步过滤测试表明，所制备的纳米 MgO/硅藻土膜通过静电吸附作用可去除水中约 99.7%的四环素。理想的静电性能使纳米 MgO/硅藻土膜成为去除水中有机污染物的候选材料。可以相信，荷电陶瓷膜在水处理领域将有广阔的应用前景。
