title: Radiation-induced grafting of sweet sorghum stalk for copper(II) removal from aqueous solution.
abstract: The influence of main components (cellulose, hemicellulose and lignin) of the sweet sorghum stalk on radiation-induced grafting reaction and adsorption of copper from aqueous solution was investigated. Sweet sorghum stalk was grafted with acrylic acid induced by γ-irradiation. The results showed that the grafted stalk contained 1.6 mmol/g carboxyl groups, and its maximal adsorption capacity was 13.32 mg/g. The cellulose, hemicellulose and lignin of the raw materials were confirmed to involve in grafting reaction through comparing the grafting yield and the structure of the grafted materials. Both the structure and the composition of the sweet sorghum stalk had influence on the grafting reaction and adsorption capacity. The adsorption capacity of the grafted sweet sorghum stalk increased about five times, and the adsorption isotherm of the grafted materials conformed to the Langmuir model. The main mechanism for copper adsorption involved in ion exchange.
authors.affiliation: Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Dong
authors.forename: Jun
authors.initials: J
authors.lastname: Hu
authors.forename: Jianlong
authors.initials: J
authors.lastname: Wang
mesh_terms: D000143:Acids / Q000737:chemistry; D000179:Acrylates / Q000737:chemistry; D000327:Adsorption; D001673:Biodegradation, Environmental; D002482:Cellulose / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D005285:Fermentation; D005720:Gamma Rays; D006860:Hydrogen Bonding; D007477:Ions; D008031:Lignin / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry*; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D045868:Sorghum / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000143:Acids; D000179:Acrylates; D007477:Ions; D019216:Metals, Heavy; D011108:Polymers; D011134:Polysaccharides; D014874:Water Pollutants, Chemical; D014867:Water; C036909:lignocellulose; D003300:Copper; C007916:hemicellulose; D002482:Cellulose; D008031:Lignin; C036658:acrylic acid
keywords: Biosorbent; Biosorption; Copper; Grafting; Lignocellulosic