Non chemical natural organic matter removal with a contact TiO2 process

Ramos, André Martins

http://hdl.handle.net/10400.1/8358

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Authors

Ramos, André Martins

Advisor(s)

Jefferson, Bruce

Jarvis, Peter

Figueira, Ana C.

Abstract(s)

The current work looked for a new media to remove natural organic matter by adsorption on TiO2 nanoparticles bound to fluoropolymers beads through photocatalysis. The work investigated the best methods of production as well the effectiveness of the media thus providing insight into its potential for further adsorption technology development. The results obtained lead to the conclusion that is possible to immobilize TiO2 on a PVDF surface by UV-V, resulting in a photocatalytic surface deposition functionalization. The extended of the PSFD reaction can be controlled by adjusting the pH, with acidic conditions increasing the extension of surface coverage. The polymer with significant results was PVDF, based on SEM figures, MB photodegradation (97.58 %), Kapp (0.054 min-1) and t1/2 (12.85 min) the optimum conditions to increase surface coverage of PVDF is a solution of 1,5 g/L of TiO2 pH 3 under 2 h on UV collimated beam. The photocatalytic activity of PVDFf-TiO2 following Jar tests suggests a very strong electrostatic bond between the TiO2 and the polymer surface. The adsorption of HA onto PVDFf-TiO2 was found to be well described by both the Langmuir and Freundlich models. The maximum adsorption capacity (qmax) was 0.0149 mg/g and the parameters n and KL show a favorable adsorption. Fixed-bed adsorption column studies was developed to remove HA from water, using a fixed bed height of 17 cm, a fixed feed concentration of 5mg/L but different flow rates. Results show that for lower flows there is a higher removal as compare with a higher flow. The best result obtained was 0.42% of HA removal with a feed flow of 1.30 mL/min.