Fotokatalitička razgradnja salicilne kiseline s imobiliziranim TiO2

master's thesis

• Title (english): Photocatalytic degradation of salicylic acid with immobilized TiO2
• Author: Ana Štrk
• Mentor: Sanja Papić (mentor)
• Committee member: Sanja Papić (predsjednik povjerenstva)
• Committee member: Ivan Brnardić (član povjerenstva)
• Committee member: Zvonimir Katančić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2015-10-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Environmental Protection in Chemical Engineering

Abstract

U ovom radu proučavana je fotokatalitička aktivnost titan dioksida, TiO2, za razgradnju salicilne kiseline kao modelnog aromatskog onečišćivala u vodi. Korišten je fotokatalizator TiO2 suspendiran u otopini salicilne kiseline i imobiliziran na mrežice od staklenih vlakana. Sol-gel sintezom pripravljena je TiO2 suspenzija korištena za nanošenje TiO2 na staklene mrežice. Fotokatalitički eksperimenti provedeni su u šaržnom anularnom reaktoru s magnetskim miješanjem u kojem je proveden eksperiment sa suspendiranim fotokatalizatorom i u četvrtastom, šaržnom reaktoru s recirkulacijom u kojem su provedeni eksperimenti s imobiliziranim fotokatalizatorom u dva različita volumena otopine salicilne kiseline. Kao izvor svjetlosnog zračenja korištena je lampa koja imitira UV-A zračenje. Uspješnost nanošenja fotokatalizatora na staklene mrežice potvrđena je pretražnom elektronskom mikroskopijom (SEM/EDS analiza), dok je stupanj razgradnje salicilne kiseline određen mjerenjem koncentracije SA primjenom tekućinske kromatografije visoke djelotvornosti (HPLC). Postignuta je razgradnja salicilne kiseline u 100 ml otopine koncentracije 0,2 mM od 9,2 % za 60 min i 19,6 % za 180 min s imobiliziranim TiO2 (0,03 g) te od 36 % sa suspendiranim TiO2 (0,10 g) za 60 min. Ustanovljena je podjednaka aktivnost imobiliziranog TiO2 u provedena tri fotokatalitička ciklusa.

Abstract (english)

The aim of this study was to investigate photocatalytic activity of titanium dioxide, TiO2, for the degradation of the salicylic acid as a model aromatic pollutant in water. Photocatalyst TiO2 was used suspended in a solution of salicylic acid and immobilized on fiberglass meshes. The TiO2 suspension was prepaired by a sol-gel synthesis and used for applying TiO2 to a fiberglass meshes. Photocatalytic experiments were conducted in batch annular reactor with magnetic stirring (experiment with suspended photocatalyst), and in rectangular, batch reactor with the recirculation (experiments with immobilized photocatalyst) in two different solution volume of salicylic acid. Lamp that emmiting the UV-A solar radiation was used as a source of radiation. Scanning Electron Microscopy (SEM / EDS analysis) confirmed the success of applying photocatalyst on the fiberglass meshes, and degree of degradation of the salicylic acid was determined by measuring the concentration of SA using High Performance Liquid Chromatography, HPLC. Degradation of the salicylic acid in 100 ml of solution concentration of 0,2 mM achieved 9,2 % for 60 min, and 19,6 % for 180 min with immobilized TiO2 (0,03 g), and 36 % with suspended TiO2 (0,10 g) for 60 min. It was established that activity of immobilized TiO2 was equal in conducted three photocatalytic cycles.

• Keywords: fotokataliza; imobilizacija TiO2; salicilna kiselina; sol-gel; ultraljubičasto zračenje
• Keywords (english): photocatalysis; immobilization of TiO2; salicylic acid; sol-gel; ultraviolet radiation
• Language: croatian
• URN:NBN: urn:nbn:hr:149:268543
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-03-20 12:28:18