Table 1. Textural Properties and Optical Properties of the Prepared Photocatalysts.

sample name	Da (nm)	A/R ratiob%	SBET (m2 g–1)	Vp (cm3 g–1)c	Dp (nm)d	BG (eV)e
TiO2	18.5	91.3/8.7	103.4	0.148	5.7	3.1
3.0 wt % NiO/TiO2	16.7	91.1/8.9	120.8	0.194	6.4	2.40
5.0 wt % NiO/TiO2	14.6	90.9/9.1	139.7	0.291	7.5	2.31
10.0 wt % NiO/TiO2	13.9	80.2/19.8	154.1	0.327	8.7	2.18
15.0 wt % NiO/TiO2	12.6	75.3/24.7	147.2	0.315	8.1	2.24
20.0 wt % NiO/TiO2	11.2	67.8/32.2	141.9	0.301	7.6	2.26

^aAnatase/rutile ratio.

^bCrystallite size.

^cTotal pore volume.

^dAverage pore size.

^eBand gap energy.