As a photocatalyst, TiO2 has been widely studied in water treatment applications. The use of TiO2 in a disinfection process with ultraviolet has shown an outstanding inactivation of viruses. The main complication of using TiO2 outside laboratory conditions has been the presence of dissolved organic matter (DOM), which contributes to the low inactivation rate of microorganisms due to the scavenging of ●OH radicals. The interaction dynamic between TiO2 and DOM was investigated by using different types of probes including pCBA and MS2 bacteriophage. Further, the effect of pH, ionic strength, and organic matter concentration on the agglomeration of TiO2 nanoparticles were studied using Dynamic Light Scattering. To evaluate the effect of DOM on the photocatalytic process photodegradation experiments were conducted using different conditions by adjusting pH and Ionic Strength. The results showed improvement in the photodegradation of pCBA with low pH and high ionic strength. The results of the experiment indicated that there is a strong inhibitory effect in high pH regardless of organic matter concentration. It was concluded that high pH can induce high inhibition due to electrostatic interaction between target compounds and inhibition of ●OH radicals’ generation. By using these results, this research will discuss that various target compounds such as MBR effluent have different adsorption behavior which makes the different photodegradation kinetics.

Investigating effect of pH and ionic strength on surface adsorption of natural organic matters on TiO2 nanoparticles

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.