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Effect of Cu(II) concentration on photocatalytic reduction of Cr(VI) by tartaric acid with 500 W xenon lamp at pH 4 and 25°C. Experimental conditions: c[Cr(VI)]0=100 μM, c(tartaric acid)0=1 mM. c[Cu(II)]0: □ 0 μM; ■ 100 μM; ▲ 200 μM; ♦ 400 μM; ● 800 μM; ─ 1,200 μM.
