The potential for perchlorate contamination in drinking water and food supplies is a human health concern because it can interfere with iodide uptake by the thyroid gland and, through this mode of action, result in decreased thyroid hormone production and may cause developing brain tumor. The many degradation techniques for perchlorate have been developed. A new method focused on reduction of perchlorate using nanoscale zero-valent iron (nZVI) particles immobilized in alginate polymer bead. But nZVI particles have strong tendency of aggregation, rapid sedimentation and limited mobility. In order to reduce their disadvantage, alginate was used in the synthesis of the nZVI particles as stabilizer. An efficient way to immobilize nZVI in a support material, alginate bead, was developed by using Ca2+ as the cross-linking cations. The efficiency and reusability of the immobilized Fe-alginate beads on the reduction of perchlorate was tested at various temperature conditions. A method for electrochemical degradation of the perchlorate anion (ClO4-) using mercury film electrode has also been studied. Electrochemical method has relatively simple pre-treatment. However, electrochemical method should avoid interference from hydrogen evolution at the applied potential to degradation of perchlorate ion, and thus applied electrode should have large hydrogen overvoltage which suppressed the hydrogen evolution at the working reduction potential. The reduction potential of perchlorate was checked by using cyclic voltammetry (CV). And the decomposition of perchlorate was performed by chronoamperometric (CA) method. Also, ion chromatography (IC) was used to confirm the degradation rates of perchlorate.

Degradation of the perchlorate anion through chemical and electrochemical methods

255th National Meeting (2018)

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