Efficiency of Polymeric Membrane Graphene Oxide-TiO₂ for Removal of Azo Dye

Table 1

The structural properties of crystals [43–45].

Properties	Rutile	Anatase	Brookite
Crystal structure	Tetragonal	Tetragonal	Orthorhombic
Lattice constant (Å)	a = 4.5936; c = 2.9587	a = 3.784; c = 9.515	a = 9.184; b = 5.447; c = 5.154
Space group	p/mnm	I/amd	pbca
Molecule (cell)	2	2	4
Volume/molecule (Å^3)	31/2160	34.061	32/172
Density ()	4.13	3.79	3.99
Ti-O band length (Å)	1.949 ()	1.937 ()	1.87–2.04
O-Ti-O band	81.2°; 90.0°	77.7°; 92.6°	77.0°–105°