title: Novel thermally stable poly(vinyl chloride) composites for sulfate removal.
abstract: BaCO(3) dispersed PVC composites were prepared through a polymer re-precipitation method. The composites were tested for sulfate removal using rapid small scale column test (RSSCT) and found to significantly reduce sulfate concentration. The method was extended to synthesize barium carbonate-loaded silica aero-gels-polyvinyl chloride (PVC) polymer composites. The PVC composites were characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray mapping, X-ray diffraction (XRD), thermogravimetric analysis (TGA) and inductively coupled plasma mass spectrometry (ICP-MS) analysis. The method has advantages over conventional sulfate precipitation (sulfate removal process) using BaCO(3) wherein clogging of the filter can be avoided. The method is environmentally friendly and does not interfere with natural organic matter as the conventional resin does. Some of the composites were thermally more stable as compared with the pure PVC discussed in the literature.
authors.affiliation: Water Supply and Water Resources Division, National Risk Management Research Laboratory US Environmental Protection Agency, 26 W Martin Luther King Drive Cincinnati, Ohio 45268, United States. Nadagouda.mallikarjuna@epa.gov
authors.forename: Mallikarjuna N
authors.initials: MN
authors.lastname: Nadagouda
authors.forename: Jonathan
authors.initials: J
authors.lastname: Pressman
authors.forename: Colin
authors.initials: C
authors.lastname: White
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Speth
authors.forename: Daniel L
authors.initials: DL
authors.lastname: McCurry
mesh_terms: D001464:Barium; D002254:Carbonates; D011232:Chemical Precipitation; D003188:Composite Resins / Q000138:chemical synthesis*; D005374:Filtration; D008722:Methods; D011143:Polyvinyl Chloride / Q000138:chemical synthesis*; D013431:Sulfates / Q000302:isolation & purification*
chemical_list: D002254:Carbonates; D003188:Composite Resins; D013431:Sulfates; D001464:Barium; C006685:barium carbonate; D011143:Polyvinyl Chloride