Table 1.

PCD activities (initial degradation rates (μM min⁻¹)) of the evaluated samples after 3 h.

Sample	4-CP	Phenol	BA
Pristine ZrO2 NPs	0.53	0.54	3.06
ZrO2-B NPs	0.34	0.28	11.1
Cr@ZrO2 NPs	0.48	0.47	4.47

The experimental uncertainties are within 5%. The experimental conditions corresponded to [4-CP]₀ = [phenol]₀ = 10 µM, [BA]₀ = 20 µM, [catalyst] = 0.5 g L⁻¹, λ ≥ 225 nm.

Significant values are in bold.