Preparation and adsorption behavior for metal ions and humic acid of chitosan derivatives crosslinked by irradiation

Preparation and adsorption behavior for metal ions and humic acid of chitosan derivatives crosslinked by irradiation 1 3 corresp first-author E-mail: Zhao_Long@nissin.co.jp E-mail: Zhao_Long@nissin.co.jp Zhao_Long@nissin.co.jp 1 1 2 2 Department of Biological and Chemical Engineering, Gunma University, Tenjin-cho, Kiryu, Gunma 376-8515, Japan; Department of Biological and Chemical Engineering, Gunma University, Tenjin-cho, Kiryu, Gunma 376-8515, Japan; Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute, Watanuki-machi, Takasaki, Gunma370-1292, Japan; Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute, Watanuki-machi, Takasaki, Gunma370-1292, Japan; Advanced Materials Research Center, R&D Laboratories, Nissin Electric Co.Ltd, Umezutakase-cho, Ukyo-ku, Kyoto 615-8686, Japan Advanced Materials Research Center, R&D Laboratories, Nissin Electric Co.Ltd, Umezutakase-cho, Ukyo-ku, Kyoto 615-8686, Japan This article deals with the determination of the adsorption properties of metal ions and humic acid in water on crosslinked chitosan derivatives (carboxymethylchitosan) which were formed using the irradiation technique without any additives. The solubility test of these crosslinked materials were investigated in acidic, alkaline media, distilled water, and certain organic solvents. Scanning electron microscopic (SEM) images showed that the crosslinked chitosan derivatives possessed a porous morphological structure. Charged characteristic analyses demonstrated typically pH-dependent properties of the crosslinked materials. The adsorption studies were carried out by the batch method at room temperature. Adsorption of heavy metal ions (such as Cu 2+ , Cd 2+ ) and humic acid onto crosslinked samples was found to be strongly pH-dependent. Adsorption kinetic studies indicated the rapid removal of metal ions, and humic acid from the aqueous solutions. Moreover, isothermal adsorption data revealed that Cu 2+ , Cd 2+ , and humic acid were removed by these crosslinked materials with high efficiency. Adsorption isothermal data were interpreted well by the Langmuir equation. These crosslinked carboxymethylated chitosan derivatives indicate favorable adsorption of metal ions and humic acid. Metal ion Humic acid Adsorption Irradiation Crosslinking Carboxymethylchitosan Reference Majeti N V , Kumar R . React Funct Polym , 2000 , 46 : 1 . React Funct Polym Martin G P . J. M. S.-Pure Appl. Chem . 1995 , A32 ( 4 ): 629 . J. M. S.-Pure Appl. Chem Muzzarelli R A A . Natural Chelating Polymer. New York: Pergamon Press , 1973 . Natural Chelating Polymer. New York: Pergamon Press Davies G ., Ghabbour E A. Humic substances: structures, properties and uses . Cambridge : The Royal Society of Chemistry , 1998 Ghabbour E A. Humic substances: structures, properties and uses Ngah W S W , Musa A . J. Appl Polym Sci . 1998 , 69 , 2305 . J. Appl Polym Sci Yan W L , Bai Renbi . Wat. Res , 2005 , 39 : 4, 688 .  Wat. Res Nagh W S W , Endud C S , Mayanar R . React Funct Polym . 2002 , 50 : 181 . React Funct Polym Kawamura Y , Mitsuhashi M , Tanibe H . Ind Engng Chem Res . 1993 , 32 : 386 . Ind Engng Chem Res Zhao L .., Mitomo H .., Nagasawa N. ., et al . Carbohydr Polym . 2003 , 51 ( 2 ): 169 . Carbohydr Polym Yoshii F , Zhao L , Wach R A , et al . Nucl. Instr. Meth. in Phys. Res. B . 2003 , 208 : 320 . Nucl. Instr. Meth. in Phys. Res. B Hsien T Y , Rorrer G. L . Ind Engng Chem Res ., 1997 , 36 : 3631 . Ind Engng Chem Res Wu F C , Tseng R L , Juang R S . J. Chem Technol Biotechnol , 2002 , 77 : 1269 . J. Chem Technol Biotechnol 10.1016/S1001-8042(07)60017-7 O631.3 + 4,X703.1 2007-01-20 2021-01-19 2007 Nuclear Science and Techniques 01 18