Thiocarbohydrazide-Modified Chitosan as Anticorrosion and Metal Ion Adsorbent

摘要

To explore the application of chitosan (CS) derivatives in anticorrosion and adsorption, thiocarbohydrazide-modified chitosan (TCHECS) derivative was synthesized and characterized. The preliminary electrochemical measurements of the behaviors of 304 steel and Cu sheets in 2% HAc (v/v) containing TCHECS, chitosan (CS), and hydrazine cross-linked epoxy-N-phthaloylchitosan (HECS) had been performed. The short-term electrochemical tests show that the new compound can act as a mixed-type metal anticorrosion inhibitor; its inhibition efficiency is 88% when the concentration was 30 mg/L. The preliminary adsorption studies for sorbents TCHECS and HECS on a metal ion mixture aqueous solution were also performed. The results show that TCHECS can absorb As (V), Ni (II), Cu (II), Cd (II), and Pb (II) efficiently at pH 9; the removal of the As (V), Ni (II), Cu (II), Cd (II), and Pb (II) are around 55.6–99.9%.