Table 1.

Catalytic efficiency comparison in 4-NP conversion

Category	Example	k (min−1)	Time (min)
platinum-based	FeAgPt alloy[40]	10.06 × 10−2	25
gold-based	Au/TiO2[41]	63.26 × 10−2	6
silver-based	Ag/Filter paper[34]	23.40 × 10−2	~12
nickel-based	Ni@PtNi NCs-rGO[42]	27.00 × 10−2	10
This work	AuNP/Sponge	10.86 × 10−1	4.5