Ozonation of Indigo Carmine Catalyzed with Fe-Pillared Clay

Table 1

Main characteristics of parent clay and Fe-PILC catalyst.

Sample	𝑑(001) (Å)	Surface area (m^2/g)	Micropore volume (cm^3/g)	Fe (wt.%)
Bentonite	—, 9.6^b	35	0.0028	2.7
Fe-PILC	24.22^a, 11.6^b	283	0.125	16

a1st peak (2θ ≈ 4°).
^b2nd peak (2θ ≈ 7–9°).