Abstract :
Titanium dioxide (TiO2) powder was mixed with varying concrete sealer formulations and applied to prepared concrete surfaces
within PVC batch reactors. A solution of 4-chlorophenol in de-ionized water, with an initial 4-chlorophenol concentration of 4 mg/L,
was added to each open reactor. The photocatalytic efficiency of each TiO2-sealer was determined through bulk solution sampling while a
reactor was exposed to continuous UV light. Through analysis of mean 4-chlorophenol concentrations, the disappearance of 4-chlorophenol
from solution was attributed solely to the presence of TiO2 in the sealed concrete surface of a UV exposed reactor. The rate of
disappearance increased when the mass percent of TiO2 in the sealer was increased. The zero-order reaction rate constants ranged from
0.135 to 0.2873 mg L 1 h 1.
2007 Elsevier Ltd. All rights reserved
