title: Sorption of cadmium from aqueous solution using pretreated rice husk.
abstract: The sorption of Cd(II) from aqueous solution by rice husk, a surplus agricultural byproduct was investigated. Some simple and low-cost chemical modifications resulted in increasing the sorption capacity of raw rice husk (RRH) from 8.58 mg/g to 11.12, 20.24, 16.18 mg/g and reducing the equilibrium time from 10 h of RRH to 2, 4 and 1 h for epichlorohydrin treated rice husk (ERH), NaOH treated rice husk (NRH), sodium bicarbonate treated rice husk (NCRH), respectively. The effect of pH, sorption kinetics and isotherms were studied in batch experiments. Good correlation coefficient was obtained for pseudo second-order kinetic model, which agreed with chemisorption as the rate-limiting mechanism. Sorption isotherm test showed that equilibrium sorption data were better represented by Langmuir model than the Freundlich model. The highly efficient low cost and the rapid uptake of Cd(II) by NCRH indicated that it could be an excellent alternative for the removal of heavy metal by sorption process.
authors.affiliation: Environmental Engineering Section, Department of Civil Engineering, Indian Institute of Technology, Kharagpur 721 302, India. upendra_kumar72@rediffmail.com
authors.forename: Upendra
authors.initials: U
authors.lastname: Kumar
authors.forename: Manas
authors.initials: M
authors.lastname: Bandyopadhyay
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000302:isolation & purification*; D004811:Epichlorohydrin; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012275:Oryza; D017693:Sodium Bicarbonate; D012972:Sodium Hydroxide; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium; D004811:Epichlorohydrin; D012972:Sodium Hydroxide; D017693:Sodium Bicarbonate