Figure 7.
DPPH radical scavenging activity. (b) Control film; (c) 1% TiO2-N; (d) 3% TiO2-N; (e) 5% TiO2-N; (f) 7% TiO2-N; (g) 3% CO-3% TiO2-N; (h) 6% CO-3% TiO2-N; (i) 9% CO-3% TiO2-N; and (j) 12% CO-3% TiO2-N.
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