Nanoparticles for Treatment of Arsenic - Nanotechnologies for Water Environment Applications - page 126

TiO 2 is between 30 and 100 US standard mesh (0.6-0.15 mm). The BET surface area
analysis indicates a surface area of 250.7 m 2 /g.

As

O

Ti

Figure 5.9 As(V) surface complexes on TiO 2 optimized with DFT theory.

pH = 9

V(As-O)

V(As-OTi)

830

808

pH = 5.5

TiO 2 Bkgd

1100 1000 900 800 700

Wavenumber (cm -1 )

Figure 5.10 FTIR spectra of As(V) adsorbed on TiO 2 .
A field filtration experiment has been conducted for approximately 4 months to
assess the feasibility of using the granular TiO 2 in POE filters for arsenic removal. As
shown in Figure 5.11, the total arsenic concentrations vary from 35 to 44 μg/L in the
well water. No As(III) is detected in the groundwater.