Abstract
This paper focuses on the effects of the PSt content of polystyrene (PSt)-poly (dimethylsiloxane) (PDMS) interpenetrateing network (IPN) polymer membranes, on the pervaporation (PV) characteristics during the removal of benzene from an aqueous solution of dilute benzene. When an aqueous solution of 0.05wt% benzene was permeated through the PSt-PDMS IPN membranes, they showed high benzene/water selectivity. Both the permeability and the benzene/water selectivity of the membranes were enhanced with increasing PSt content in the PSt-PDMS IPN membrane. The physicochemical mechanism of permeation and separation through the PSt-PDMS IPN membranes during PV is also discussed. The best normalized permeation rate, separation factor for benzene selectivity, and PV separation index of the PSt-PDMS IPN membrane were 1.27 × 10-6 kgm (m2hr)-1, 3293, and 41821, respectively. These PV characteristics are discussed from the viewpoint of the chemical and physical structure of the PSt-PDMS IPN membranes.
Highlights
Volatile organic compounds (VOCs) such as aromatic hydrocarbons and chlorinated hydrocarbons are used as washing solvents in the chemical industry, and cause soil pollution
This paper focuses on the effects of the PSt content of polystyrene (PSt)-poly (PDMS) interpenetrating network (IPN) polymer membranes on the pervaporation (PV) characteristics during the removal of benzene from an aqueous solution of dilute benzene
This paper focuses on the effects of the structure of IPN membranes composed of polystyrene (PSt), which is one of hydrophobic polymers, and PDMS on the removal of benzene from an aqueous solution of dilute benzene through their IPN membranes during PV
Summary
Volatile organic compounds (VOCs) such as aromatic hydrocarbons and chlorinated hydrocarbons are used as washing solvents in the chemical industry, and cause soil pollution Such pollution contaminates the subterranean water and water in rivers and ponds. VOCs are known to be chemical materials that disturb internal secretions (environmental hormones), and are potentially dangerous to humans As such, these chemicals have to be removed from contaminated water. Poly(dimethylsiloxane) (PDMS) membranes have been studied as VOC-permselective membranes, because they have both high permselectivity and high permeability for organic chemicals in water [9,10,11,12]. The relationship between the removal characteristics for the benzene/water selectivity and the structure of IPN membrane is discussed in detail
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