Utjecaj matrice uzorka na fotolitičku i fotokatalitičku razgradnju N-nitrozamina

master's thesis

• Title (english): Influence of matrix composition on photolytic and photcatalytic degradation of N-nitrosamines
• Author: Karla Krešić
• Mentor: Sandra Babić (mentor)
• Committee member: Sandra Babić (predsjednik povjerenstva)
• Committee member: Dragana Mutavdžić Pavlović (član povjerenstva)
• Committee member: Irena Škorić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2025-02-20, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U procesu dezinfekcije vode mogu nastati dezinfekcijski nusprodukti (DNP) koji su štetni za ljudsko zdravlje. Primjer dezinfekcijskih nusprodukata su nitrozamini koji sadrže dušik te doprinose toksičnosti vode. Zbog toga je neophodno razviti učinkovite metode uklanjanja DNP-a iz vode, kao što su napredni oksidacijski i membranski procesi. U ovom radu istražena je fotolitička i fotokatalitička razgradnja N-nitrozamina korištenjem UV-LED fotoreaktora. Analizirani N-nitrozamini su: N-nitrozo-dimetilamin (NDMA), N-nitrozodietilamin (NDEA),
N-nitrozomorfolin (NMOR) i N-nitrozopiperidin (NPIP). Za izvor zračenja korištene su
UV-A (λ = 365 nm) i UV-C (λ = 272 nm) svjetleće diode. Fotokatalitička razgradnja nitrozamina izvedena je pomoću tankog filma TiO2 te uz pomoć suspenzije TiO2. Fotolitička razgradnja ispitana je u ultračistoj, sintetskoj bazenskoj, morskoj i boćatoj vodi te u retentatu nakon
RO/NF postupka. Istražen je utjecaj valne duljine zračenja, broja LED dioda te sastava matrice na kinetiku razgradnje N-nitrozamina. Rezultati su pokazali da je najučinkovitiji fotoreaktor s najvećim brojem UV-A LED dioda za sve ispitane matrikse tijekom perioda od 60 min.

Abstract (english)

Disinfection by-products (DBP) are harmful to human health and are formed during water disinfection. Examples of disinfection by-products are nitrosamines that contain nitrogen and contribute to the toxicity of drinking water. Therefore, it is necessary to develop effective methods for removing DBPs from water, such as advanced oxidation and membrane processes. In this paper, the photolytic and photocatalytic degradation of N-nitrosamines was investigated using a UV-LED photoreactor. The analyzed N-nitrosamines are:
N-nitroso-dimethylamine (NDMA), N-nitrosodiethylamine (NDEA), N-nitrosomorpholine (NMOR), and N-nitrosopiperidine (NPIP). UV-A (λ = 365 nm) and UV-C (λ = 272 nm)
light-emitting diodes were used as the radiation source. The photocatalytic degradation of nitrosamines was carried out using a thin film of TiO2 and with the help of a TiO2 suspension. The photolytic degradation was carried out in ultrapure, synthetic pool, sea, and brackish water and in retentate after the RO/NF process. The influence of the radiation wavelength,
the number of LEDs and the type of matrix on the kinetics of N-nitrosamine degradation were investigated. The results showed that the most efficient photoreactor is that with UV-A LED diodes with six columns of UV-LED strips in all tested matrices during a time period of 60 min.

• Keywords: N-nitrozamini; fotoreaktor; fotolitička razgradnja; fotokatalitička razgradnja; UV-LED diode
• Keywords (english): N-nitrosamines; photoreactor; photolytic degradation; photocatalytic degradation; UV-LED diodes
• Language: croatian
• URN:NBN: urn:nbn:hr:149:256638
• Project: Number: IP-2024-05-7383; Title: Inovativni pristupi za smanjenje nusproizvoda dezinfekcije voda - nove tehnologije za nove izazove; Title: Innovative approaches for water disinfection byproducts mitigation - new technologies for new challenges; Acronym: InWatTechno; Leader: Krešimir Košutić; Jurisdiction: Croatia; Funder: Hrvatska zaklada za znanost; Funding stream: Research Projects
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2026-02-20
• Created on: 2025-02-28 10:21:09