title: Removal of Ni (II) ions from aqueous solutions using modified rice straw in a fixed bed column.
abstract: This paper investigates the ability of modified rice straw, an agricultural biomaterial, to remove Ni (II) ions from aqueous solution in a fixed-bed column. The experiments were performed with different bed heights (1.5 and 2.0 cm), influent Ni (II) concentrations (50, 75 and 100 mg/L) using flow rates (500 μl/min) in order to obtain experimental breakthrough curves. The maximum adsorption capacity of rice straw powder (RSP) was 43 mg/L at 75 mg/L influent concentration of divalent Ni (II) ions at 2 cm bed depth. Adams-Bohart model, Thomas model and Yoon and Nelson kinetic models were used to analyze the column performance. The value of rate constant for Adams-Bohart and Yoon and Nelson model decreased with increase of influent concentration, but increased with increasing bed depth. The rate constant for Thomas model increased with initial influent Ni (II) ions concentration, decreased with increase in bed depth.
authors: Department of Biotechnology, Panjab University, Chandigarh 160014, India. Electronic address: anji14dec@gmail.com.
authors: Reena
authors: R
authors: Sharma
authors: Department of Biotechnology, Panjab University, Chandigarh 160014, India. Electronic address: gilljwms2@gmail.com.
authors: Baljinder
authors: B
authors: Singh
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D007477:Ions; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry; D009532:Nickel / Q000737:chemistry*; D012275:Oryza / Q000378:metabolism*; D011208:Powders; D013997:Time Factors; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D007477:Ions; D019216:Metals, Heavy; D011208:Powders; D014874:Water Pollutants, Chemical; D009532:Nickel
keywords: Adsorption; Fixed bed column; Modified rice straw powder; Ni (II) ions