Synthesis of zero-valent copper-chitosan nanocomposites and their application for treatment of hexavalent chromium.
This study used ionotropic crosslinking to synthesize chitosan-tripolyphosphate chelating resin beads, which are used to fabricate zero-valent copper-chitosan nanocomposites. The copper nanoparticles were dispersed on chitosan-tripolyphosphate beads, and were thus able to maintain appropriate dispersion and stability, which greatly improves their applicability. The fabrication process contains two steps: using chitosan-tripolyphosphate beads to adsorb Cu(II) ions, followed by chemical reduction to reduce Cu(II) ions to zero-valent copper. This study explored the adsorption of synthesized chitosan-tripolyphosphate beads to Cu(II) ions, and used SEM/EDS, XPS, and TEM to examine the properties of zero-valent copper-chitosan nanocomposites. The results showed that, the adsorption behavior of hexavalent chromium from aqueous solution onto fabricated nanocomposites has better adsorption capacity than that of the chitosan-tripolyphosphate beads.
Wu
Shao-Jung
SJ
Department of Chemical Engineering, Ming Chi University of Technology, Taipei Hsien, Taiwan, ROC. sjwu@mail.mcut.edu.tw
Liou
Tzong-Horng
TH
Mi
Fwu-Long
FL
D000327:Adsorption; D048271:Chitosan / Q000138:chemical synthesis*; D002857:Chromium / Q000302:isolation & purification*; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008863:Microspheres; D053761:Nanocomposites / Q000737:chemistry*; D011122:Polyphosphates / Q000737:chemistry; D013057:Spectrum Analysis
D011122:Polyphosphates; D002857:Chromium; C074702:chromium hexavalent ion; D003300:Copper; D048271:Chitosan; C005692:triphosphoric acid