title: Modification of porous starch for the adsorption of heavy metal ions from aqueous solution.
abstract: Porous starch xanthate (PSX) and porous starch citrate (PSC) were prepared in anticipation of the attached xanthate and carboxylate groups respectively forming chelation and electrostatic interactions with heavy metal ions in the subsequent adsorption process. The lead(II) ion was selected as the model metal and its adsorption by PSX and PSC was characterized. The adsorption capacity was highly dependent on the carbon disulfide/starch and citric acid/starch mole ratios used during preparation. The adsorption behaviors of lead(II) ion on PSXs and PSCs fit both the pseudo-second-order kinetic model and the Langmuir isotherm model. The maximum adsorption capacity from the Langmuir isotherm equation reached 109.1 and 57.6 mg/g for PSX and PSC when preparation conditions were optimized, and the adsorption times were just 20 and 60 min, respectively. PSX and PSC may be used as effective adsorbents for removal of heavy metals from contaminated liquid.
authors: School of Science, Tianjin University, Tianjin 300072, China.
authors: Xiaofei
authors: X
authors: Ma
authors: School of Science, Tianjin University, Tianjin 300072, China.
authors: Xueyuan
authors: X
authors: Liu
authors: Bioproducts and Bioprocesses National Science Program, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK S7N 0X2, Canada.
authors: Debbie P
authors: DP
authors: Anderson
authors: Bioproducts and Bioprocesses National Science Program, Agriculture and Agri-Food Canada, 107 Science Place, Saskatoon, SK S7N 0X2, Canada; Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada. Electronic address: peter.chang@agr.gc.ca.
authors: Peter R
authors: PR
authors: Chang
mesh_terms: D000327:Adsorption; D007700:Kinetics; D019216:Metals, Heavy / Q000737:chemistry*; D016062:Porosity; D013213:Starch / Q000031:analogs & derivatives / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D013213:Starch
keywords: Adsorption; Heavy metal ions; Porous starch; Starch citrate; Starch modification; Starch xanthate