Titanium dioxide has been extensively tested in environmental applications, especially in
separation technologies. In the present study, anatase nanoparticles were synthesized by
using a sol-gel method, and batch adsorption experiments were carried out to analyze
arsenic removal capacity of the anatase nanoparticles from water. The maximum arsenic
removal percentages were found ~ 84 % for As(III) at pH 8 and ~98% for As(V) at pH 3,
respectively, when 5 g/l anatase nanoparticles were used at an initial arsenic
concentration of 1 mg/l. The results of the sorption experiments, which take into
consideration the effects of equilibrium concentration on adsorption capacity, were
analyzed with two popular adsorption models, Langmuir and Freundlich models. From the
comparison of R2 values, the adsorption isotherm for As(III) was fitted
satisfactorily well to the Langmuir equation (R2 > 0.996) while the
adsorption behavior of As(V) on anatase nanoparticles was described better with Freundlich
equation (R2 > 0.991). This study proposes the potential adsorbent material
for water which is contaminated with arsenic species.