Analiza i modeliranje fotorazgradnje neonikotinoidnog insekticida pod utjecajem UVA-LED zračenja

master's thesis

• Title (english): Analysis and modeling of neonicotinoid insecticide photodegradation under UVA-LED irradiation
• Author: Filip Kurt
• Mentor: Vanja Kosar (mentor)
• Committee member: Vanja Kosar (predsjednik povjerenstva)
• Committee member: Vesna Tomašić (član povjerenstva)
• Committee member: Marin Kovačić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

U današnje vrijeme zbog naglog rasta populacije raste potreba za hranom što je dovelo do povećanja proizvodnje i primjene pesticida u svijetu. Pesticidi su postojana organska onečišćivala koja uzrokuju značajne probleme u okolišu, pogotovo u vodama. S obzirom da ih je teško ukloniti iz voda konvencionalnim tehnikama obrade, prednost se daje naprednim oksidacijskim procesima s naglaskom na heterogenu fotokatalizu. U ovom radu ispitivana je fotokatalitička razgradnja neonikotinoidnog insekticida acetamiprida u kotlastom reaktoru volumena 250 mL primjenom UVA-LED izvora zračenja uz TiO2 fotokatalizator. Svi eksperimenti su provedeni uz jednaku početnu koncentraciju acetamiprida, masu TiO2 i pH otopine. Ispitivan je utjecaj brzine miješanja (200, 400 i 600 okr min^-1), intenziteta zračenja preko napona izvora (30,5, 31 i 31,5 V) i koncentracije vodikovog peroksida (0, 3 i 6 ppm). Prije provedbe eksperimenata napravljen je plan eksperimenata pomoću programskog paketa Design-Expert. Nakon svakog eksperimenta mjerena je pH vrijednost reakcijske smjese. Stupanj razgradnje acetamiprida određen je iz razlika koncentracija acetamiprida na početku i kraju reakcije primjenom tekućinske kromatografije visoke učinkovitosti. Dobiveni eksperimentalni podaci testirani su na kinetički model za reakciju pseudo-prvog reda. Eksperimentalni rezultati pokazali su da intenzitet zračenja najviše utječe na brzinu i učinkovitost fotokatalitičke razgradnje acetamiprida. Brzina reakcije i konverzija rastu porastom intenziteta zračenja i koncentracije vodikovog peroksida te smanjenjem brzine miješanja.

Abstract (english)

Nowadays, due to the rapid population growth, the need for food is growing, which has led to an increase in the production and use of pesticides in the world. Pesticides are persistent organic pollutants that cause significant environmental problems, especially in water. Since they are difficult to remove from water by conventional treatment techniques, advanced oxidation processes are preferred, with an emphasis on heterogeneous photocatalysis. In this work, the photocatalytic degradation of the neonicotinoid insecticide acetamiprid in a 250 mL bulk reactor was investigated using a UVA-LED radiation source with a TiO2 photocatalyst. All experiments were performed with the same initial acetamiprid concentration, amount of TiO2 and pH value of solution. The influence of three parameters was examined: mixing speed (200, 400 and 600 rpm), radiation intensity using the applied voltage (30,5, 31 and 31,5 V) and hydrogen peroxide concentration (0, 3 and 6 ppm). Before performing the experiment, a plan of experiments was made using the Design-Expert software package. After each experiment, the pH of the reaction mixture was measured. The degree of degradation of acetamiprid was determined by measuring the concentration of acetamiprid at the beginning and end of the reaction using high performance liquid chromatography. The obtained experimental results were tested with the kinetic model for the pseudo-first order reaction. Experimental results showed that the radiation intensity had the greatest effect on the rate and efficiency of photocatalytic degradation of acetamiprid. Reaction speed and conversion rates increase with increasing radiation intensity and hydrogen peroxide concentration and with decreasing mixing rate.

• Keywords: heterogena fotokataliza; acetamiprid; TiO2; DOE; UVA-LED modul
• Keywords (english): heterogeneous photocatalysis; acetamiprid; TiO2; DOE; UVA-LED module
• Language: croatian
• URN:NBN: urn:nbn:hr:149:298885
• 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: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka ekoinženjerstva (magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-03-07 15:41:58