TiO₂ Photocatalyst Nanoparticle Separation: Flocculation in Different Matrices and Use of Powdered Activated Carbon as a Precoat in Low-Cost Fabric Filtration

Table 2

Impact of aqueous matrix and PAC type on pH of suspensions containing 1 g/L TiO₂ and 2 g/L PAC.

Matrix	pH
	Merck PAC	Hydraffin WG PAC
Deionized water	6.5	3.5
0.5 g/L NaCl	6.9	3.6
0.5 g/L NaHCO3	8.4	8.0
Biologically treated greywater	8.1	7.4
Secondary municipal effluent	7.7	7.1