Fotokatalitička razgradnja fenolnih spojeva TiO2 katalizatorima

master's thesis

• Title (english): Photocatalytic degradation of phenol derivatives using TiO2 catalysts
• Author: Kristian Bakić
• Mentor: Vanja Kosar (mentor)
• Committee member: Vanja Kosar (predsjednik povjerenstva)
• Committee member: Vesna Tomašić (član povjerenstva)
• Committee member: Juraj Šipušić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2017-09-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Reaction Engineering

Abstract

Postojana organska onečišćivala (eng. persistent organic pollutants, POPs) su spojevi koji se teško uklanjaju iz otpadnih voda. Tradicionalne metode uklanjanja tih spojeva često su skupe i opasne za okoliš. Fotokataliza se, kao jedan od naprednih oksidacijskih procesa (eng. advanced oxidation processes, AOPs), istražuje kao moguća metoda uklanjanja postojanih organskih onečišćivala iz otpadnih voda. U dosadašnjim istraživanjima poseban je naglasak stavljen na fotokatalizu u prisutnosti TiO2 kao fotokatalizatora. Cilj ovog rada je ispitati utjecaj radnih uvjeta (temperatura, koncentracija onečišćivala, valna duljina izvora zračenja, prisutnost/odsutnost katalizatora, izvedba reaktora, masa katalizatora) na kinetiku fotokatalitičke razgradnje fenola. Fenol je izabran, kao modelno onečišćivalo iz grupe POPs-a. Fotokatalitičke reakcije provedene su u anularnom fotokatalitičkom reaktoru, a inicirane su ozračivanjem reakcijskog sustava ultraljubičastim zračenjem. Nađeno je da se fenol najbrže razgrađuje pri višim temperaturama (35 °C) te pri nižim valnim duljinama UV zračenja (254 nm). Fotokatalitička razgradnja fenola provedena je u dvije izvedbe reaktora: reaktoru sa suspendiranim slojem fotokatalizatora i reaktoru s imobiliziranim slojem fotokatalizatora. Izvedba reaktora s imobiliziranim slojem katalizatora nije dala zadovoljavajuće rezultate u razgradnji fenola. Detaljno je opisana kinetika reakcije primjenom Langmuir-Hinshelwoodovog mehanističkog kinetičkog modela.

Abstract (english)

Persistent organic pollutants (POPs) are hardly removable compounds in wastewaters. Traditional methods for removing these compounds are often expensive and hazardous for environment. Photocatalysis, as one of the advanced oxidation processes (AOPs), is researching as a possible method for removing POPs from wastewaters. In the previous studies special attention has been given to the photocatalysis in the presence of TiO2. The aim of this study is to compare influence of different parameters (temperature, pollutant concentration, wavelength of irradiation, presence/absence of the catalyst, reactor configuration, catalyst load) on the kinetic of photocatalytic degradation of phenol, as a model pollutant from POPs group. Catalytic reactions are performed in the annular photocatalytic reactor and initiated by irradiation of reaction system using UV light. It was found that the phenol degradation rate is greatest at higher temperatures (35 °C) and using lower wavelength light (254 nm). Photocatalytic degradation of phenol was carried out in two types of reactor: the slurry reactor and the fixed bed reactor. The fixed bed reactor did not give satisfying results for phenol degradation. The Langmuir-Hinshelwood model is employed to describe reaction kinetic.

• Keywords: fotokataliza; UV-zračenje; titanov (IV) oksid; postojana organska onečišćivala; fenol
• Keywords (english): photocatalysis; UV-radiation; titanium (IV) oxide; persistent organic pollutants; phenol
• Language: croatian
• URN:NBN: urn:nbn:hr:149:805019
• 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: 2020-04-22 12:40:04