| Title |
Pervaporation of Aqueous Organic Chlorides by Zeolite / PDMS Membranes |
| Authors |
조민석(Min Seok Cho),최상규(Sang Gue Choi),김승재(Seung Jai Kim),김진환(Jin Hwan Kim) |
| Abstract |
Organic chlorides are very toxic and easy to accumulate within human bodies and most of them are known to be potential carcinogens. Since the contaminated water by these compounds causes serious problems for providing potable water, the effective separations of chlorinated organics from water are required. In order to separate trace organic chlorides from aqueous solutions, poly (dimethylsiloxane) (PDMS) membrane and zeolite-filled PDMS membranes were prepared and the permeation characteristics of chlorinated organics were investigated by the experiments of sorption, diffusion and pervaporation at the temperature of 25℃. Seven chlorinated organics such as dichloromethane(DCM), chloroform(CF), perchloromethane(PCM), dichlroethylene(DCE), trichloroethylene (TCE), perchloroethylene(PCE) and chlorobenzene(CB) have been selected as representitive compounds for the current study and methanol(MeOH) was also used for comparison. Compared to the zeolite-free PDMS membrane, the permeation fluxes of organic chlorides through zeolite/PDMS membranes were reduced, while the fluxes of methanol were enhanced. However, the permeation selectivities for both organic chlorides and methanol were improved. The decreased fluxes of organic chlorides were resulted from the decreases of both sorptions and diffusion coefficients in the zeolite/PDMS membrane, but the enhanced fluxes of methanol were due to the increase of sorptions. The permeate flux of organic chlorides through zeolite/PDMS membrane was 17∼24 g/㎡hr and permeation selectivity ranged from 4,500 to 12,600. |