1 research outputs found
Self-Competitive Adsorption Behavior of Arsenic on the TiO<sub>2</sub> Surface
TiO2 is a commonly used material to remove
arsenic from
drinking water by adsorption as well as photocatalytic oxidation (PCO).
In the present paper, arsenic adsorption and PCO at different pH environments
are studied on the (1 1 0) facet of rutile TiO2 (r-TiO2). A self-competitive adsorption (SCA) behavior of arsenic
is observed; i.e., arsenic species compete to adsorb on the surface.
Related DFT calculations are carried out to simulate adsorption. SCA
behavior is the key to connecting calculation results with experimental
results. Furthermore, PCO of arsenite is performed at different pH
values. Of note, PCO is related to adsorption; namely, the adsorption
process determines the whole PCO reaction speed. Therefore, SCA is
also helpful for the PCO reaction. The SCA behavior is useful not
only for arsenic on r-TiO2 but also for arsenic on anatase
TiO2 (a-TiO2). It may be helpful to further
study arsenic adsorption and PCO on other materials such as Fe2O3 and MnO2. The SCA behavior extends
our understanding of arsenic and provides new insights into arsenic
removal and its cycle in nature