Figures (11)  Tables (5)

    • Figure 1. 

      Oxime-ligand FTIR spectrum.

    • Figure 2. 

      MOC FTIR spectrum.

    • Figure 3. 

      Stoichiometric equation of the reaction of MOC and metabisulphite ion.

    • Figure 4. 

      Graph of Abs vs mole ratio for the oxidation of S2O52− by MOC. Condition: [MOC] = 1.9 × 10−3 mol·dm−3, [S2O52−] = (0.4.18 – 95.0) × 10−4 mol·dm−3, [H+] = 0.02 mol·dm−3, T = 301 K, λmax = 560 nm.

    • Figure 5. 

      Typical pseudo-first order plot for the oxidation of S2O52− by MOC. Condition: [MOC] = 1.9 × 10−3 mol·dm−3, [S2O52−] = 9.5 × 10−2 mol·dm−3, [H+] = 0.02 mol·dm−3, T = 301 K, λmax = 560 nm.

    • Figure 6. 

      Graph of logkob against log[S2O52−] for the oxidation of S2O52− by MOC. Condition: [MOC] = 1.9 × 10−3 mol·dm−3, [S2O52−] = (1.9 − 11.4) × 10−2 mol·dm−3, [H+] = 0.02 mol·dm−3, T = 301 K, λmax = 560 nm.

    • Figure 7. 

      Lineweaver-Burk plot of Michealis-Menten’s plot modification for intermediate determination.

    • Figure 8. 

      Specific conductance-concentration curve for CTAB.

    • Figure 9. 

      Specific conductance-concentration curve for SDS.

    • Figure 10. 

      The catalytic micelle - substrate model of Piszkiewicz's concept.

    • Figure 11. 

      Simple redox routes of MOC and S2O52−.

    • Item Band (cm−1) Assignment
      Ligand 1,654.9 C=N (stretching)
      1,591.8 N-O (bending)
      MOC 767.1 & 745.5 Mo=O (stretching)
      584.7 Mo-N (stretching)
      1,300.7 C-N (stretching)
      1,599.5 N-O (bending)
      Molar conductivity 133 S·cm2·mol−1

      Table 1. 

      Molecular vibrations of interest for the MOC and its molar conductivity.

    • 102[S2O52−] (mol·dm−3) 102[H+] (mol·dm−3 ) μ
      (mol·dm−3 )      		 103kob
      (s−1 )      		 102k2 (dm3·mol−1·s−1)
      1.9 2.0 0.40 2.53 11.53
      2.9 2.0 0.40 3.92 11.61
      3.8 2.0 0.40 4.61 11.52
      4.8 2.0 0.40 5.99 11.61
      5.7 2.0 0.40 7.14 11.53
      6.7 2.0 0.40 8.52 11.62
      7.6 2.0 0.40 9.21 11.40
      8.6 2.0 0.40 10.13 11.45
      9.5 2.0 0.40 11.05 11.64
      10.5 2.0 0.40 12.21 11.68
      11.4 2.0 0.40 13.13 11.52
      9.5 2.0 0.40 11.05 11.64
      9.5 2.5 0.40 11.52 12.12
      9.5 3.0 0.40 12.21 12.84
      9.5 3.5 0.40 12.44 13.09
      9.5 4.0 0.40 12.89 13.58
      9.5 4.5 0.40 13.13 13.82
      9.5 5.0 0.40 14.05 14.79
      9.5 5.5 0.40 14.74 15.51
      9.5 6.0 0.40 16.58 17.45
      9.5 6.5 0.40 17.50 18.42
      9.5 7.0 0.40 17.96 18.91
      9.5 2.0 0.35 9.21 9.69
      9.5 2.0 0.40 11.05 11.64
      9.5 2.0 0.45 11.98 12.61
      9.5 2.0 0.50 12.67 13.33
      9.5 2.0 0.55 14.05 14.79
      9.5 2.0 0.60 16.59 17.45
      9.5 2.0 0.65 18.65 19.63
      9.5 2.0 0.70 21.42 22.55
      9.5 2.0 0.80 25.33 26.67
      9.5 2.0 0.85 34.55 36.36
      Condition: [MOC] = 1.9 × 10−3 mol·dm−3, [H+] = 0.02 mol·dm−3, T = 301 K, λmax = 560 nm.

      Table 2. 

      Rate constants for the oxidation of S2O52− ion by MOC.

    • D 103kob (s−1) 102k2 (dm3·mol−1·s−1)
      77.2 11.05 11.64
      76.5 9.44 9.94
      75.9 9.21 9.69
      75.2 7.83 8.24
      74.5 7.14 7.52
      73.9 6.45 6.79
      73.2 5.53 5.82
      72.5 4.61 4.85
      71.9 4.38 4.61
      71.2 3.92 4.12
      Condition: [MOC] = 1.9 × 10−3 mol·dm−3, [S2O52−] = 9.5 × 10−3 mol·dm−3, [H+] = 0.02 mol·dm−3, T = 301 K, λmax = 560 nm.

      Table 3. 

      Effect of medium polarity on the oxidation speed of S2O52− ion by MOC at λmax = 560 nm.

    • Ion 103[Ion]
      (mol·dm3)      		 103kob
      (s−1)      		 102k2
      (dm3·mol−1·s−1)
      NH4+ 0.00 11.05 11.64
      8.00 12.21 12.85
      12.0 12.46 13.43
      16.0 12.89 13.58
      20.0 13.36 14.06
      24.0 14.05 14.79
      28.0 11.95 15.76
      HCOO− 0.00 11.05 11.64
      8.00 9.90 10.42
      12.0 8.06 8.42
      16.0 7.37 7.76
      20.0 5.76 6.06
      24.0 5.07 5.33
      28.0 4.38 4.61
      Condition: [MOC] = 1.9 × 10−3 mol·dm3, [S2O52−] = 9.5 × 10−3 mol·dm−3, [H+] = 0.02 mol·dm−3, T = 301 K, λmax = 560 nm.

      Table 4. 

      Effect of counter-ions on the oxidation speed of S2O52− ion by MOC at λmax = 560 nm.

    • Micelle
      generator      		 n KD KD−1 km
      (dm3·mol−1·s−1)      		 r2 kw
      (dm3·mol−1·s−1)
      CTAB 1.4955 0.6114 1.6355 0.8623 0.9898 0.1164
      SDS 2.2751 0.8367 1.1951 0.0155 0.9451 0.1164

      Table 5. 

      Factors of Piszkiewicz kinetic model.