[Retracted] Simple Preparation of the CuO•Fe₃O₄/Silica Composite from Rice Husk for Enhancing Fenton-Like Catalytic Degradation of Tartrazine in a Wide pH Range

Table 1

Textural properties of as-synthesized SiO₂ and as-synthesized CuO•Fe₃O₄/SiO₂ composite.

Sample	SBET (m^2/g)	Pore volume (cm^3/g)	Average pore size (nm)
SiO2	496.4	1.154	9.3
CuO•Fe3O4/SiO2	248.6	0.420	6.2