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Effect of temperature on Cu(II) photocatalytic reduction of Cr(VI) by tartaric acid with 500 W xenon lamp at pH 4. Experimental conditions: c[Cr(VI)]0=100 μM, c(tartaric acid)0=1 mM, and c[Cu(II)]0=400 μM. ■ 15°C [□ control without Cu(II)]; ♦ 25°C (◊ control); ● 35°(◯ control).
