Uklanjanje diklofenaka iz vode pod simuliranim sunčevim zračenjem uz TiO2-SnS2 nanokompozitni fotokatalizator

master's thesis

• Title (english): Removal of diclofenac from water under simulated solar irradiation using TiO2-SnS2 nanocomposite photocatalyst
• Author: Marija Bradić
• Mentor: Hrvoje Kušić (mentor)
• Committee member: Hrvoje Kušić (predsjednik povjerenstva)
• Committee member: Ana Lončarić Božić (član povjerenstva)
• Committee member: Helena Otmačić Ćurković (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2016-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Environmental Protection in Chemical Engineering

Abstract

Cilj ovog istraživanja je razvoj heterogenog fotokatalitičkog sustava za razgradnju diklofenaka u modelnoj otpadnoj vodi. Diklofenak je nesteroidni, protuupalni lijek i zbog ograničene biorazgradivosti jedan je od najčešće detektiranih farmaceutika u efluentima i površinskim vodama. Lako se bioakumulira u tkivima vodenih organizama te tako ulazi u hranidbeni lanac, a zbog mogućeg štetnog djelovanje na ljudsko zdravlje uvršten je na „watch listu“ Dodatka X Okvirne direktive o vodama (2013/39/EU). U ovom istraživanju uklanjanje diklofenaka provedeno je u šaržnom kotlastom fotoreaktoru pod simuliranim Sunčevim zračenjem uz TiO2-SnS2nanokompozitni fotokatalizator imobiliziran na staklenom nosaču. TiO2 se u dosadašnjim istraživanjima kao fotokatalizator pokazao učinkovit za uklanjanje većine organskih onečišćenja, bakterija, bojila, pesticida i dr., ali aktivan je samo u UV području. SnS2 je aktivniji pod Sunčevim zračenjem u odnosu na TiO2, međutim podložan je fotokoroziji. Kombinacijom TiO2 sa SnS2 i u odgovarajućem omjeru povećava se fotokatalitička aktivnost i stabilnost pod vidljivim zračenjem. Pojedinačni fotokatalizatori te nanokompozitni TiO2-SnS2 pripremljeni su solvotermalnom i sol-gel sintezom, taloženjem s otopinom sulfida te sintezom u talini. Dobiveni katalizatori karakterizirani su primjenom različitih instrumentalnih tehnika (XRD, FTIR, SEM i TGA), a imobilizacija je provedena tehnikom spin-coating. Hidrotermalni te sol-gel TiO2-SnS2 fotokatalizatori pokazali su se učinkovitijima za razgradnju diklofenaka pri pH 7 pod simuliranim Sunčevim zračenjem u odnosu na TiO2 P25.

Abstract (english)

The goal of this research is the development of a heterogeneous photocatalytic system for the degradation of diclofenac in model wastewater. Diclofenac is a non-steroidal, anti-inflammatory drug and because of its limited bio-degradability it is one of the most detected pharmaceuticals in efluents and surface waters. It is easily bioaccumulated in thetissues of water organisms and thus enters the food chain, and because of possible harmful consequences to human health it has been added on the "watch list" of the Annex X Water framework Directive (2013/39/EU). In this research the removal of diclofenac was carried out in a batch photoreactor under simulated solar irradiation with the TiO2-SnS2 nano-composite photocatalyst immobilized on glass substrate. As a photocatalyst, TiO2 has proven efficiency in removing most of the organic pollution, bacteria,colorants, pesticides etc., but it is only active in the UV spectrum. While SnS2 is more active in visible wavelengths, it is susceptible to photocorrosion. In combination with SnS2, in an appropriate ratio, the photocatalytic activity and stability are improved, therefore making the composite photocatalyst more active in the visible spectrum. Individual catalysts and nano-TiO2-SnS2 are prepared applying hydrothermal and sol-gel synthesis, by precipitation with solution of the sulfides and by synthesis in melt. Synthesized catalysts were characterized using different instrumental techniques (XRD, FTIR, SEM and TGA), while the immobilization is carried out with the spin-coating technique. Hydrothermal and sol-gel synthesized photocatalysts have shown increased activity under simulated solar irradiation at pH = 7 in comparison to TiO2 P25.

• Keywords: diklofenak; heterogena fotokataliza; fotokatalitička razgradnja; nanokompozitni fotokatalizator TiO2-SnS2
• Keywords (english): diclofenac; heterogeneous photocatalysis; photocatalytic degradation; nano TiO2-SnS2 photocatalyst
• Language: croatian
• URN:NBN: urn:nbn:hr:149:752419
• 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: 2017-11-24 09:05:04