title: Kinetics of cadmium, chromium, and lead sorption onto chemically modified sugarcane bagasse and wheat straw.
abstract: In this study, cadmium (Cd), chromium (Cr), and lead (Pb) adsorption potential of unmodified and modified sugarcane bagasse and ground wheat straw was explored from aqueous solution through batch equilibrium technique. Both the materials were chemically modified by treating with sodium hydroxide (NaOH) alone and in combination with nitric acid (HNO3) and sulfuric acid (H2SO4). Two kinetic models, pseudo-first order and pseudo-second order were used to follow the adsorption process and reaction fallowed the later model. The Pb removal by both the materials was highest and followed by Cr and Cd. The chemical treatment invariably increased the adsorption capacity and NaOH treatment proved more effective than others. Langmuir maximum sorption capacity (q m) of Pb was utmost (12.8-23.3 mg/g of sugarcane bagasse, 14.5-22.4 mg/g of wheat straw) and of Cd was least (1.5-2.2 mg/g of sugarcane bagasse, 2.5-3.8 mg/g of wheat straw). The q m was in the order of Pb > Cr > Cd for all the three adsorbents. Results demonstrate that agricultural waste materials used in this study could be used to remediate the heavy metal-polluted water.
authors.affiliation: Land Resources Research Institute, National Agricultural Research Centre, Islamabad, 45500, Pakistan, mmh@comsats.net.pk.
authors.forename: M
authors.initials: M
authors.lastname: Mahmood-ul-Hassan
authors.forename: V
authors.initials: V
authors.lastname: Suthar
authors.forename: E
authors.initials: E
authors.lastname: Rafique
authors.forename: R
authors.initials: R
authors.lastname: Ahmad
authors.forename: M
authors.initials: M
authors.lastname: Yasin
mesh_terms: D000327:Adsorption; D000383:Agriculture; D002104:Cadmium; D002482:Cellulose; D002857:Chromium; D004784:Environmental Monitoring; D007700:Kinetics; D019216:Metals, Heavy / Q000302:isolation & purification*; D008956:Models, Chemical; D031786:Saccharum; D014908:Triticum; D014866:Waste Products; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D019216:Metals, Heavy; D014866:Waste Products; D014874:Water Pollutants, Chemical; D002104:Cadmium; D002857:Chromium; D002482:Cellulose; C027433:bagasse