Utjecaj mikrovalnog sušenja na imobilizaciju fotokatalizatora na nosač

undergraduate thesis

• Title (english): The effect of microwave drying on immobilization of photocatalyst on a carrier
• Author: Matija Borošić
• Mentor: Ivan Brnardić (mentor)
• Mentor: Igor Jajčinović (pomoć pri izradi, neposredni voditelj)
• Committee member: Anita Štrkalj (predsjednik povjerenstva)
• Committee member: Ivan Brnardić (član povjerenstva)
• Committee member: Tamara Holjevac Grgurić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2019-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract

Jedan od prioriteta zaštite okoliša je zaštita voda i vodenih tokova. Ovim problemom znanost se već dugo bavi, ali konstantno se pokušava inovativnim i poboljšanim metodama podići pročišćavanje voda na novu razinu. Pojava mikroonečišćujućih tvari u pročišćenim otpadnim vodama te vodama za piće pobudila je interes kod znanstvenika u pronalasku rješenja za njihovo uklanjanje. Primjer takvog procesa je fotokataliza kod koje dolazi do potpune razgradnje mikroonečišćivala odnosno nastajanja neopasnih razgradnih produkata. U tu svrhu koriste se fotokatalizatori kao što je titanijev dioksid (TiO2).
U radu je kao nosač za imobilizaciju TiO2 korištena staklena mrežica. Imobilizacija TiO2 na staklenu mrežicu je provedena sol-gel metodom uz dva različita načina sušenja; klasičnim i mikrovalnim sušenjem na različitim snagama. Provedena je karakterizacija dobivenih fotokatalizatora pretražnom elektronskom mikroskopijom (SEM), energijsko disperzivnom rendgenskom spektroskopijom (EDS) i rendgenskom difrakcijskom analizom (XRD). Dobiveni rezultati SEM/EDS analize ukazuju da je došlo do vezanja čestica koje su prilikom sušenja mikrovalovima većih dimenzija te da pripadaju TiO2. Iz XRD rezultata se može zaključiti da prisutnost amorfne faze silana smanjuje relativni udio anatasa i rutila te utječe na smanjenje specifične površine. Najbolji rezultati fotokatalitičke razgradnje salicilne kiseline dobiveni su korištenjem mrežice pripravljene klasičnim sušenjem što je i u korelaciji s navedenim rezultatima.

Abstract (english)

One of the priorities of environmental protection is the protection of water and water flows. With this problem, science has long been involved, but it is constantly trying to innovate and improve methods to raise water cleaning to a new level. The emergence of micro-pollutants in cleaned wastewaters and drinking water inspired the interest of scientists in finding solutions of their removal. An example of such a process is photocatalysis, which results in complete decomposition of micro-pollutants or the formation of non-hazardous degradation products. Photocatalysts such as titanium dioxide (TiO2) are used for this purpose.
In this work a glass mesh was used as an immobilizer for TiO2. The immobilization of TiO2 on the glass mesh was carried out by the sol-gel method with two different drying methods; classic and microwave drying using different powers. Characterization of photocatalysts was obtained by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction analysis (XRD). The results of the SEM/EDS analysis indicate that particles with big dimensions have been attached to glass mesh which is dried with microwaves and it belong to TiO2. From the XRD results it can be concluded that the presence of the amorphous silane phase reduces the relative proportion of anatase and rutile and affects the reduction of the specific surface. The best results of photocatalytic degradation of salicylic acid were obtained using a mesh prepared using classical drying, which is also correlated with results.

• Keywords: mikroonečišćenja; titan dioksid; fotokataliza; sol-gel
• Keywords (english): micropollutants; titanium dioxide; photocatalysis; sol-gel
• Language: croatian
• URN:NBN: urn:nbn:hr:115:718375
• Study programme: Title: Metallurgy; specializations in: Metallurgical Engineering, Industrial Ecology; Course: Industrial Ecology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-09-27 11:36:19