Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Effect of pH on Cu(II) photocatalytic reduction of Cr(VI) by tartaric acid with 500 W xenon lamp at 25°C. Experimental conditions: c[Cr(VI)]0=100 μM, c(tartaric acid)0=1 mM, and c[Cu(II)]0=400 μM. Initial pH: ■ 3 [□ control without Cu(II)]; ♦ 4 (◊ control); ● 5 (◯ control); ▲ 6 (Δ control).
