Fotorazgradnja acetamiprida u pločastom fotoreaktoru

undergraduate thesis

• Title (english): Photodegradation of acetamiprid in a plate photoreactor
• Author: Ivan Zgrebec
• Mentor: Vesna Tomašić (mentor)
• Committee member: Domagoj Vrsaljko (predsjednik povjerenstva)
• Committee member: Vesna Tomašić (član povjerenstva)
• Committee member: Marina Duplančić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-09-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Pesticidi su toksične kemijske tvari ili mješavine tvari ili bioloških sredstava koje se namjerno otpuštaju u okoliš kako bi se spriječile, kontrolirale i/ili ubijale populacije štetnika. Otpornost pesticida na biološku, kemijsku i fotolitičku razgradnju uzrokuje njihovu akumulaciju s neželjenim posljedicama u okolišu. Cilj ovog istraživanja je razvoj prikladnog katalizatora za fotorazgradnju modelne komponente insekticida. Kao modelna komponenta korišten je insekticid acetamiprid (C10H11ClN4), koji dolazi kao sastavna komponenta komercijalnog proizvoda Mospilan. Istraživanje je provedeno u pločastom reaktoru s recirkulacijom reakcijske smjese primjenjujući imobilizirani sloj fotokatalizatora (TiO2). Ispitan je utjecaj početne pH vrijednosti reakcijske smjese na učinkovitost fotorazgradnje acetamiprida u uvjetima simuliranog Sunčevog zračenja. Također je uspoređena učinkovitost fotolitičke i fotokatalitičke razgradnje acetamiprida određivanjem promjene koncentracije acetamiprida pomoću tekućinske kromatografije visoke djelotvornosti. Za pripremu imobiliziranog fotokatalitičkog sloja korištena je abrazivna podloga kao nosač te mineralno vezivo Procol. Nađeno je da fotolitičkom reakcijom dolazi do neznatne razgradnje acetamiprida uz primjenu simuliranog Sunčevog zračenja. Fotokatalitička razgradnja acetamiprida u uvjetima simuliranog Sunčeva zračenja najučinkovitija je pri pH=4,5-6,5. Također je ustanovljeno da je fotokatalitička razgradnja acetamiprida učinkovitija uz primjenu ultrazvučne predobrade reakcijske smjese u trajanju od 15 minuta. Rezultati kinetičke analize pokazali su da se fotokatalitička razgradnja acetamiprida pri uvjetima korištenim u ovom radu može opisati primjenom jednostavnog kinetičkog modela za reakciju prvoga reda.

Abstract (english)

Pesticides are toxic chemicals or mixtures of substances or biological agents that are intentionally released into the environment to prevent, control, and/or kill pest populations. The resistance of pesticides to biological, chemical and photolytic degradation leads to their accumulation with undesirable consequences in the environment. The aim of this research is to develop a suitable catalyst for the photochemical degradation of the model component of insecticides. The insecticide acetamiprid (C10H11ClN4), which occurs as a component of the commercial product Mospilan, was used as the model component. The study was carried out in a plate photoreactor with recirculation of the reaction mixture using an immobilized photocatalyst layer (TiO2). The effect of initial pH of the reaction mixture on the efficiency of photocatalytic degradation of acetamiprid under the conditions of simulated solar radiation was investigated. The efficiency of photolytic and photocatalytic degradation of acetamiprid was also compared by determining the change in acetamiprid concentration using high performance liquid chromatography. An abrasive substrate was used as a support and the mineral binder Procol was used to prepare the immobilized photocatalytic layer. It was found that the photolytic reaction leads to a slight decomposition of acetamiprid under simulated solar irradiation. The photocatalytic degradation of acetamiprid under simulated solar radiation is most effective at pH = 4.5-6.5. It was also found that the photocatalytic degradation of acetamiprid was more efficient when the reaction mixture was pretreated with ultrasound for 15 minutes. The results of the kinetic analysis showed that the photocatalytic degradation of acetamiprid under the conditions used in this work can be described by a simple first-order kinetic model.

• Keywords: pesticidi; insekticidi; acetamiprid; titanijev (IV) oksid TiO2; fotokataliza; fotoliza; fotokatalizator
• Keywords (english): pesticides; insecticides; acetamiprid; titanium (IV) oxide TiO2; photocatalysis; photolysis; photocatalyst
• Language: croatian
• URN:NBN: urn:nbn:hr:149:040986
• 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: 2023-04-27 08:27:48