Removal of emulsified food and mineral oils from wastewater using surfactant modified barley straw.
Barley straw, an agricultural waste, was chemically modified and evaluated for the removal of emulsified oils from aqueous solution. The chemical modification was performed using NaOH and a cationic surfactant, hexadecylpyridinium chloride monohydrate (CPC). The surface textural and chemical properties of the surfactant modified barley straw (BMBS) were characterized by N(2) adsorption, FT-IR, SEM and water soluble mineral content. The adsorption tests were carried out in batch adsorption system for removal of standard mineral oil (SMO) and canola oil (CO) from water. For both emulsified oils in wastewater, adsorption was found to be strongly related with solution pH. The isotherm study indicated that emulsified oil adsorption on BMBS could be fitted well with the Langmuir model other than Freundlich model. The maximum adsorption capacity for CO and SMO at 25 degrees C determined from the Langmuir isotherm is 613.3 and 584.2 mg g(-1), respectively. Desorption tests in water solution show that oil is strongly bonded with adsorbent and desorption is only about 1-2% in 24 h.
Ibrahim
Shariff
S
Department of Chemical Engineering, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia. shasmach88@gmail.com
Ang
Ha-Ming
HM
Wang
Shaobin
S
D000327:Adsorption; D001709:Biotechnology / Q000379:methods; D002412:Cations; D002594:Cetylpyridinium / Q000737:chemistry; D045703:Emulsifying Agents; D005229:Fatty Acids, Monounsaturated / Q000302:isolation & purification*; D001467:Hordeum / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning / Q000379:methods; D008899:Mineral Oil / Q000032:analysis / Q000302:isolation & purification*; D008903:Minerals / Q000737:chemistry; D000074262:Rapeseed Oil; D017550:Spectroscopy, Fourier Transform Infrared; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
D002412:Cations; D045703:Emulsifying Agents; D005229:Fatty Acids, Monounsaturated; D008903:Minerals; D000074262:Rapeseed Oil; D013501:Surface-Active Agents; D014867:Water; D008899:Mineral Oil; D002594:Cetylpyridinium