title: Modification of Vermiculite for the Preparation of Floating Adsorbent for Phosphate in Wastewater.
abstract: Floating adsorbents made from exfoliated vermiculite (EV) were tested for their ability to remove phosphate in aqueous solution. The modified vermiculites (MEV) were prepared with EV/glycerol ratio of 1/4 where glycerol contained 4 mol% H2SO4 and heated until designated temperatures. The highest specific surface area of 58.6 m(2)/g and carbon content of 62.2% were obtained for MEV heated at 580 °C and 380 °C, respectively. The dry density of MEV was decreased from 1.78 g/cm(3) (EV) to 0.25 g/cm(3), indicating these adsorbent floating characteristic. The MEV heated at 380 °C showed the highest Freundlich partition coefficient of 45.7 L/kg and the highest Langmuir sorption capacity of 714.3 mg/kg among other MEVs (476.2 mg/kg for MEV-580 and 181.8 mg/kg for MEV-780). Removal of phosphate using MEV heated at 380 °C was well explained by pseudo-second-order model and model parameters were comparable to other phosphate adsorption tests.
authors.affiliation: Pukyong National University, Busan, Republic of Korea.
authors.forename: Taeyoon
authors.initials: T
authors.lastname: Lee
authors.forename: Sangmin
authors.initials: S
authors.lastname: Lee
authors.forename: Jeakeun
authors.initials: J
authors.lastname: Lee
authors.forename: Jun-Heok
authors.initials: JH
authors.lastname: Lim
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D000538:Aluminum Silicates; D010710:Phosphates; D062065:Wastewater; D014874:Water Pollutants, Chemical; C003760:vermiculite