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Table 1 shows the specific surface area of TiO2 before use (Initial) and after use. The specific surface area slightly decreases after HA degradation. There are at least two factors which lead to decreased specific surface area. The first factor is occupation of the catalyst surface by the HA degradation by-products, which results in pore blockage. This is indicated by the decreased total pore volume and pore diameter as well as the presence of TOC on the solid phase. The second factor is agglomeration of the catalyst particles, which leads to a decrease of total surface area.

Table 1

Surface properties of TiO2

ParameterSpecific surface area (m2/g)Total pore volume (cm3/g)Pore diameter (nm)
TiO2 (Initial) 52 0.026 2.008 
TiO2 (UVA) 47.30 0.023 1.974 
TiO2 (UVC) 49.59 0.024 1.989 
ParameterSpecific surface area (m2/g)Total pore volume (cm3/g)Pore diameter (nm)
TiO2 (Initial) 52 0.026 2.008 
TiO2 (UVA) 47.30 0.023 1.974 
TiO2 (UVC) 49.59 0.024 1.989 

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