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J Hazard Mater

Title:		Removal of hazardous chlorinated VOCs from aqueous solutions using novel ZSM-5 loaded PDMS/PVDF composite membrane consisting of three hydrophobic layers
Author(s):		Ramaiah KP; Satyasri D; Sridhar S; Krishnaiah A;
Address:		"Department of Chemistry, Sri Venkateswara University, Tirupati 517502, India"
Journal Title:		J Hazard Mater
Year:		2013
Volume:		20130731
Issue:
Page Number:		362 - 371
DOI:		10.1016/j.jhazmat.2013.07.048
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"Hydrophobic polymer possesses significant potential for selective separation of volatile organic compounds (VOCs) from their aqueous solutions by pervaporation (PV). In the present study mixed matrix hydrophobic membranes of polydimethylsiloxane (PDMS) supported on polyvinylidenefluoride (PVDF) substrate were synthesized by incorporating hydrophobic inorganic ZSM-5 filler. The indigenous membranes were crosslinked with tetraethylorthosilicate (TEOS) for the extraction of volatile chlorinated hydrocarbons such as dichloromethane (DCM), trichloromethane (TCM), 1,2-dichloroethane (DCE), and 1,1,2,2-tetrachloroethane (TeCE), which pose serious environment threat and health hazard. Thermal stability, crosslinking, crystallinity, surface morphology and swelling characteristics of the indigenously developed membranes were determined by TGA, FTIR, XRD, SEM and sorption studies, respectively. Effect of operating parameters such as feed composition and filler concentration on separation performance in terms of flux and selectivity were determined. Flux of DCM, TCM, DCE and TeCE was found to be 0.166, 0.146, 0.141 and 0.06 kg m(-2)h(-1) with selectivity of 541, 1068, 917 and 15,000, respectively, for 20% ZSM-5 filled PDMS membrane for aqueous feeds containing 1.33% (w/v) DCM, 0.8% (w/v) TCM, 0.84% (w/v) DCE and 0.28% (w/v) TeCE in water. The membrane exhibited considerable feasibility for scale-up with significant potential for removal of hazardous chlorinated VOCs from aqueous solutions"
Keywords:		"Adsorption Dimethylpolysiloxanes/*chemistry Hydrocarbons, Chlorinated/*chemistry Membranes, Artificial Polyvinyls/*chemistry Volatile Organic Compounds/chemistry Water Pollutants, Chemical/*chemistry Water Purification/instrumentation/methods Zeolites/*ch;"
Notes:		"MedlineRamaiah, K Pattabhi Satyasri, D Sridhar, S Krishnaiah, A eng Research Support, Non-U.S. Gov't Netherlands 2013/08/21 J Hazard Mater. 2013 Oct 15; 261:362-71. doi: 10.1016/j.jhazmat.2013.07.048. Epub 2013 Jul 31"