Figure 1. XPS wide-scan spectra of un-decontaminated SiO₂ in (a), SiO₂ boiled in 0.01 (b), 0.05 (c), 5 (d), and 10% (e) sodium peroxodisulfate solutions for 15 min, followed by ultrasonic rinsing with acetone for 30 min.

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