Priprema i karakterizacija heterogenih TiO2/perlit fotokatalizatora

undergraduate thesis

• Title (english): Preparation and characterization of heterogeneous TiO2/perlite photocatalysts
• Author: Monika Papić
• Mentor: Vanja Kosar (mentor)
• Committee member: Vanja Kosar (predsjednik povjerenstva)
• Committee member: Vesna Tomašić (član povjerenstva)
• Committee member: Ana Lončarić Božić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-07-07, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Obrada otpadnih voda danas je od iznimne važnosti za buduću ekološku i ekonomsku perspektivu. Osim same obrade, izrazito je bitno unaprijediti postojeće te osmisliti povoljne nove postupke pročišćavanja voda koji ne zahtijevaju velike investicije ni dodatne smetnje po okoliš. Sve češća metoda obrade otpadnih voda napredni su oksidacijski procesi karakterizirani brzim reakcijama, neznatnim utjecajem na okoliš, ne generira se dodatni otpad, tretiraju se gotovo svi organski spojevi i ne stvara se mulj kao kod bioloških ili kemijskih procesa. U ovom radu kao temelj obrade uzeta je heterogena fotokataliza čija je značajka pomak elektrona iz valentne u vodljivu vrpcu, pri apsorpciji svjetlosti, poluvodiča odnosno fotokatalizatora. Značajke najraširenijeg fotokatalizatora, titanijevog dioksida (TiO2), su široka dostupnost, kemijska i biološka inertnost te otpornost na koroziju koje ga čine najpovoljnijim za upotrebu. Za veću učinkovitost procesa i za izbjegavanje poteškoća pri njegovoj provedbi, poželjno je fotokatalizator vezati na nosač. Navedenom imobilizacijom, provedenom jednom od opisanih metoda, stvaraju se fizikalne ili kemijske veze između katalizatora i nosača što produljuje vijek trajanja katalizatora te omogućuje kontinuiran proces obrade. Relativno nedavno otkriven kao potencijalni nosač, karakteriziran dostupnošću i neškodljivošću, jest perlit ili vulkansko staklo. Istraženi su faktori koji utječu na učinkovitost procesa pri korištenju perlita kao nosača te na učinkovitost procesa s TiO2/perlitom. Obzirom na fotoaktivnost TiO2 u uskom rasponu valnih duljina UV područja, proučena su moguća poboljšanja navedenog.

Abstract (english)

Wastewater treatment is of absolute importance nowadays for the secured ecological and economic perspective of the future. In addition to the treatment itself, it is mandatory to improve the existing and devise new water treatments that don’t require large investments or additional environmental damage. An increasingly common method of wastewater treatment is advanced oxidation processes characterized by fast reaction rates, low environmental footprint, no new waste is produced, almost all organic compounds are treated, and no sludge formed as in biological or chemical processes. In this paper, heterogeneous photocatalysis, based on the shift of electrons from valence to conductive band with light absorption by semiconductors or photocatalysts, is taken as the basis. The most researched photocatalyst titanium dioxide (TiO2) is characterized by several beneficial properties such as availability, chemical and biological inertness and corrosion resistance that make it the most suitable for use. To increase the operation efficiency and to avoid difficulties in its implementation, it is desirable to attach the photocatalyst to a carrier. This immobilization, carried out by one of the described methods, creates physical or chemical bonds between the catalyst and the carrier, which prolongs the life of the catalyst ad allows a continuous process. Recently discovered as a potential carrier, characterized by availability and harmlessness, is perlite or volcanic glass. Attention has been paid to increasing the effectiveness of the procedure when using perlite as a carrier and to the factors influencing the process in which the TiO2/perlite composite was used. Given the activity of TiO2 in a narrow range of UV wavelengths, possible improvements of the mentioned have been investigated.

• Keywords: otpadne vode; heterogena fotokataliza; titanijev dioksid; perlit
• Keywords (english): wastewaters; heterogeneous photocatalysis; titanium dioxide; perlite
• Language: croatian
• URN:NBN: urn:nbn:hr:149:500492
• Study programme: Title: Environmental Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka ekoinženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-03-09 13:23:30