Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9684634 | Journal of Membrane Science | 2005 | 10 Pages |
Abstract
A series of novel inorganic-organic hybrid positively charged membranes were prepared by coupling of 3-glycidoxypropyltrimethoxysilane (GPTMS) and mixed GPTMS/Ti(O-n-C4H9)4 in n-butyl alcohol (BuOH) solution at various temperatures and then followed quaternary amination with trimethyl amine (TMA). The synthesized membranes were characterized by IEC, streaming potential, pure water flux, FT-IR, TGA measurements as well as SEM observations. It was exhibited that anion exchange capacities (IECs) of the membranes decreased with increasing curing temperature within a range of (1.4-3.1) Ã 10â2 mequiv. cmâ2 coated for one time and (3.5-4.6) Ã 10â2 mequiv. cmâ2 coated for two times. The positive charge of the membranes was approved by these IEC values as well as FT-IR spectrum of step products and streaming potential values. The thermal stability was tested by TGA analysis and showed that the membranes doped with titanium could undergo a curing temperature up to 300 °C. Pure water flux showed that they decreased with increasing curing temperature, the composition of precursor and dip-coating times, respectively. SEM observations indicated that the membranes became thicker and denser with increasing content of titanium, but excessive Ti-content would decrease the stability of SiOTi bonds in the membranes.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Junsheng Liu, Tongwen Xu, Ming Gong, Yanxun Fu,