Određivanje reaktivnih vrsta pri fotokatalitičkoj razgradnji acetamiprida u rotacijskom fotoreaktoru

undergraduate thesis

• Title (english): Determination of reactive species during photocatalytic degradation of acetamiprid in a rotating photoreactor
• Author: Lovrena Kos
• Mentor: Vesna Tomašić (mentor)
• Committee member: Vesna Tomašić (predsjednik povjerenstva)
• Committee member: Marin Kovačić (član povjerenstva)
• Committee member: Marina Duplančić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-12, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Pesticidi su kemijski spojevi koji se koriste za suzbijanje štetnih nametnika koji ugrožavaju razne poljoprivredne kulture. Istovremeno mogu imati štetan učinak na okoliš i brojne organizme što predstavlja veliki problem. Neonikotinoidi su relativno nova skupina insekticida sa sve većom primjenom. Jedan od najčešće primjenjivanih neonikotinoida je acetamiprid kojega karakterizira visoka stabilnost i topljivost u vodi, pa stoga može dospjeti u površinske i podzemne vode. Cilj ovog rada je određivanje reaktivnih vrsta odgovornih za uspješno provođenje fotorazgradnje acetamiprida. Za tu svrhu ispitan je utjecaj dodatka različitih spojeva koji selektivno reagiraju s pojedinim reaktivnim vrstama. Acetamiprid je korišten kao modelna komponenta s obzirom da je sastavna komponenta često primjenjivanog insekticida koji dolazi pod trgovačkim imenom Mospilan (Sigma Aldrich) s masenim udjelom od 20%. Fotokatalitička razgradnja acetamiprida ispitana je u rotacijskom fotoreaktoru u uvjetima recirkulacije reakcijske smjese primjenom imobiliziranog sloja TiO2 UVC 4h fotokatalizatora te uz UVA izvore zračenja. Učinkovitost fotorazgradnje praćena je mjerenjem promjene koncentracije acetamiprida s vremenom zračenja primjenom tekućinske kromatografije visoke učinkovitosti. Analizom rezultata utvrđeno je da je fotokatalitička razgradnja učinkovitija od fotolitičke razgradnje. Potvrđeno je da superoksidni anionski radikali i singletni kisik imaju presudnu ulogu u fotokatalitičkoj razgradnji acetamiprida.

Abstract (english)

Pesticides are chemical compounds used to suppress or control pests that threaten various agricultural crops. At the same time, they can have harmful effects on the environment and many organisms, which is a major problem. Neonicotinoids are a new type of insecticide that is being used with increasing frequency. One of the most commonly used neonicotinoids is acetamiprid, which is characterized by high stability and water solubility. Therefore, it can get into the surface and groundwater. The aim of this work is to determine the reactive species responsible for the successful photodegradation of acetamiprid. For this purpose, the influence of the addition of different compounds that selectively react with certain reactive species was tested. Acetamiprid was used as a model compound because it is a constituent component of a commonly used insecticide that comes under the trade name Mospilan (Sigma Aldrich) with a mass fraction of 20%. Photocatalytic degradation of acetamiprid was tested in a rotating photoreactor under conditions of recirculation of the reaction mixture with an immobilized photocatalyst layer and with a UVA radiation source. TiO2 UVC 4h was used as the catalyst. The efficiency of photodegradation was monitored based on the change of acetamiprid concentration with irradiation time using high-performance performance liquid chromatography. Analysis of the results showed that photocatalytic degradation was more effective than photolytic degradation. Superoxide anion radicals and singlet oxygen play a crucial role in the photocatalytic degradation of acetamiprid.

• Keywords: pesticidi; neonikotinoidi; fotokataliza; reaktivne kisikove vrste; acetamiprid; hvatači
• Keywords (english): pesticides; neonicotinoids; photocatalysis; reactive oxygen species; acetamiprid; scavengers
• Language: croatian
• URN:NBN: urn:nbn:hr:149:661739
• Project: Number: IP-2018-01-8669; Title: Intenzifikacija fotokatalitičkih i katalitičkih procesa za obradu otpadnih voda i otpadnih plinova; Acronym: IN-PhotoCat; Leader: Vesna Tomašić; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2023-03-02 12:24:22