Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Study of Electrochemical Cs Uptake Into a Nickel Hexacyanoferrate/Graphene Oxide Composite Film

  • Choi, Dongchul (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Cho, Youngjin (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Bae, Sang-Eun (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute) ;
  • Park, Tae-Hong (Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute)
  • Received : 2018.09.03
  • Accepted : 2018.10.19
  • Published : 2019.06.30
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Abstract

We investigated the electrochemical behavior of an electrode coated with a nickel hexacyanoferrate/graphene oxide (NiPB/GO) composite to evaluate its potential use for the electrochemical separation of radioactive Cs as a promising approach for reducing secondary Cs waste after decontamination. The NiPB/GO-modified electrode showed electrochemically switched ion exchange capability with excellent selectivity for Cs over other alkali metals. Furthermore, the repetitive ion insertion and desertion test for assessing the electrode stability showed that the electrochemical ion exchange capacity of the NiPB/GO-modified electrode increased further with potential cycling in 1 M of $NaNO_3$. In particular, this electrochemical treatment enhanced Cs uptake by nearly two times compared to that of NiPB/GO and still retained the ion selectivity of NiPB, suggesting that the electrochemically treated NiPB/GO composite shows promise for nuclear wastewater treatment.

Keywords

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Fig. 1. Schematic illustration for preparation of a NiPB/GO composite solution

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Fig. 3. Raman spectra (a) and XRD patterns (b) of GO, NiPB, and NiPB/GO. SEM (c) and TEM (d) images of NiPB/GO; the inset of (d) shows the selected area electron diffraction pattern of NiPB/GO.

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Fig. 4. CVs of NiPB and NiPB/GO in 1 M NaNO3 electrolyte at a scan rate of 50 mV·s-1 (a), CVs of NiPB/GO in various electrolytes (1 M of LiNO3, NaNO3, KNO3, and CsNO3) at a scan rate of 5 mV·s-1 (b), and mixture solutions of 0.1 M Na+ and different concentrations of Cs+ at a scan rate of 5 mV·s-1 (c).

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Fig. 5. Normalized capacity of the NiPB- and NiPB/GO-modified electrodes during CV measurements for 1500 cycles (in 1 M of NaNO3; potential range: 0-1 V; scan rate: 100 mV·s-1) (a), CVs of electrochemically treated NiPB/GO (NiPB/GOA) in 1 M of alkali electrolytes at a scan rate of 5 mV·s-1 (b), and comparison of CVs of NiPB/GO (black solid) and NiPB/ GO-A (red dash) in 1 M of CsNO3 at 5 mV·s-1 (c).

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Fig. 2. Schematic illustration of electrochemical reversible intercalation/deintercalation process of alkali metal ions at NiPB.

Table 1. Half-potentials and charge densities of NiPB/GO and NiPB/GO-A modified electrode in various electrolytes

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