Premium
Modification of Vermiculite for the Preparation of Floating Adsorbent for Phosphate in Wastewater
Author(s) -
Lee Taeyoon,
Lee Sangmin,
Lee Jeakeun,
Lim JunHeok
Publication year - 2016
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143015x14362865227111
Subject(s) - vermiculite , wastewater , adsorption , phosphate , chemistry , waste management , pulp and paper industry , environmental science , environmental engineering , materials science , engineering , organic chemistry , composite material
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% H 2 SO 4 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.