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Effect of the concentration of tartaric acid on Cu(II) photocatalytic reduction of Cr(VI) with 500 W xenon lamp at pH 4 and 25°C. Experimental conditions: c[Cr(VI)]0=100 μM, c[Cu(II)]0=400 μM. c(tartaric)0: ■ 0.5 mM [□ control without Cu(II)]; ♦ 1 mM (◊ control); ● 2 mM (◯ control); ▲ 4 mM (Δ control).
