To investigate the interaction of Cr(VI) and phenol in the photocatalytic process, the photocata lytic reaction of the mixed solution of these two pollutants was carried out using poly(fluorene co thiophene) modified TiO 2 photocatalyst and visible light. In this mixed system, the removal efficiency in the presence of Cr(VI) and phenol were higher than that produced by individual systems, indicating a synergetic effect between the reduction of Cr(VI) and degradation of phenol. In the mixed system, Cr(VI) ions were reduced by the photo generated electrons, and phenol was oxidized by photo generated holes. In the presence of Cr(VI) ions, both the photocatalytic degradation and mineralization efficiency of phenol were promoted, but the promoting role was not the same. There was an optimum value of phenol/Cr(VI) molar ratio (1 : 1) in the degradation process. If the ratio was less than 1 : 1, the promoting effect decreased slowly but was still fairly distinct. The mineralization efficiency of phenol increased gradually with the increasing concentration of Cr(VI) ions, but when phenol/Cr(VI) was less than 1 : 1, the rate of increase became slower.

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K2Cr2O7, K2Cr3Om, and K2Cr4O13 dissolve in the molten salt solvent but do not react until the temp. range of anhydrous Ca(NO3)2, when Lux‐Flood acid‐base reaction occurs yielding chromate.