Synthesis and application of porous chitosan chelating resin

• Main Authors: Hong Dong-Liang, 洪東良
• Other Authors: Wu Shao-Rong
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/49398793653150043453

碩士 === 明志科技大學 === 化學工程研究所 === 98 === This study used ionotropic crosslinking and freeze-drying methods to synthesize porous chitosan-tripolyphosphate chelating resin beads, which were used for the adsorption of Cu(II) ions from aqueous solution. The adsorption capacity and adsorption isotherm of porous beads for Cu(II) ions were studied. Batch studies indicated that the experimental data of Cu(II) ions adsorption equilibrium correlated well with the Langmuir and Freundlich isotherm models. The maximum capacity for the adsorption of Cu(II) ions deduced from the use of Langmuir isotherm equation was 208.3 mg/g. Kinetic analysis suggested that the adsorption of Cu(II) ions behaves as a pseudo- second order kinetic model. The porous chitosan-tripolyphosphate beads can be used to adsorb Cu(II) ions, and then fabricate zero-valent copper-chitosan nanocomposites after the reduction process. The results showed that the adsorption behavior of Cr(VI) and As(V) ions from aqueous solution onto fabricated nanocomposites has better adsorption capacities than those of the porous chitosan-tripolyphosphate beads. The adsorption kinetics data of the nanocomposites were well described by the pseudo second-order equation, and the adsorption isotherms were both fitted by the Langmuir equation and Freundlich equation. The maximum adsorption capacities calculated from Langmuir equation were 129.9 and 44.6 mg/g for Cr(VI) and As(V) ions, respectively. Acid environment (with pH 3~5) has been confirmed as the best operational condition for Cr(VI) and As(V) ions adsorption of the nanocomposites.