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- Title
Modification of Vermiculite for the Preparation of Floating Adsorbent for Phosphate in Wastewater.
- Authors
Taeyoon Lee; Sangmin Lee; Jeakeun Lee; Jun-Heok Lim
- 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 m²/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/cm³ (EV) to 0.25 g/cm³, 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.
- Subjects
VERMICULITE; GLYCERIN; PHOSPHATES; FREUNDLICH isotherm equation; PARTITION coefficient (Chemistry)
- Publication
Water Environment Research (10614303), 2016, Vol 88, Issue 8, p724
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143015X14362865227111