Preparation, Photocatalytic Activity, and Recovery of Magnetic Photocatalyst for Decomposition of Benzoic Acid

Table 2

Factors and their levels for the experiments.

Factor	Level 1	Level 2	Level 3
A: pH^a	A1	A2	A3
B: weight ratio of TiO2/SiO2(Fe3O4)	1	3	5
C: calcined temperatures of TiO2/SiO2/Fe3O4	350°C	550°C	750°C

^aThe numbers are explained in Table 2.