Facile Synthesis and Photocatalytic Property of Titania/Carbon Composite Hollow Microspheres with Bimodal Mesoporous Shells

Table 2

Effects of calcination time on surface areas and pore parameters of TiO₂/C composite microspheres at 450°C.

Time (h)	Material abbreviations	𝑆^aBET (m^2/g)	Pore volume^b (cm^3/g)	Average pore Size^b (nm)	Porosity^c (%)
0.5	TiO2/C-0.5	210.5	0.129	2.4	33.5
1	TiO2/C-1	55.3	0.076	5.5	22.8
2	TiO2/C-2	46.4	0.073	6.3	22.2
4	TiO2/C-4	20.8	0.044	8.5	14.6

^aThe BET surface area was determined by multipoint BET method using the adsorption data in 𝑃/𝑃₀ range from 0.05 to 0.3. ^bPore volume and average pore size were determined by nitrogen adsorption volume at 𝑃/𝑃₀=0.994. ^cThe porosity is estimated from the pore volume determined using the desorption data at 𝑃/𝑃₀=0.994.