Photocatalytic Degradation of NOM for Power Plant Feedwater using Coating and Suspension of TiO2

ABSTRACT: This study investigated the effectiveness of coating and suspension of Degussa P25 TiO 2 photocatalyst to remove natural organic matter (NOM) from surface water for use as power plant feedwater. The catalyst yield, transmittance intensity and X‐ray pattern as a function of the number of coatings were characterized. In addition, P25 coating photocatalytic activity was studied. The photocatalytic activity also of P25 suspension with different catalyst concentrations and the reusing of the catalyst without and with regeneration was investigated. Results obtained show that the P25 coatings were transparent with good adhesion to the glass substrate. P25 suspension was found to be more effective in the NOM photodegradation and gave a higher rate constant compared to P25 coating. The maximum rate constants were 0.028 and 0.015 min −1 at 0.7 g/L P25 suspension and 4 coatings, respectively. After four runs without regeneration and three runs with regeneration of P25 reusing, the photoactivity to remove NOM was still significant.