Fotokatalitička razgradnja imidakloprida u anularnom reaktoru

master's thesis

• Title (english): Photocatalytic degradation of imidacloprid in an annular reactor
• Author: Martina Barić
• 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: 2022-02-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Povećana potreba za hranom rezultirala je intenzivnom primjenom pesticida. Nekontrolirana uporaba pesticida uzrokuje njihovu bioakumulaciju u okolišu što dovodi do onečišćenja tla, zraka i vode, što negativno djeluje na zdravlje ljudi. Budući da je primjenom konvencionalnih tehnika teško ukloniti pesticide iz voda i pritom postići stroge kriterije o dozvoljenim koncentracijama, za uklanjanje pesticida iz voda i otpadnih voda koriste se napredni oksidacijski procesi, od kojih se posebno ističe heterogena fotokataliza. U ovom radu istraživana je fotokatalitička razgradnja neonikotinoidnog insekticida imidakloprida u vodenoj otopini. Eksperimenti su provedeni u anularnom reaktoru s recirkulacijom reakcijske smjese primjenom imobiliziranog sloja TiO2 fotokatalizatora modificiranog prethodnim izlaganjem djelovanju UV-C zračenja. U kinetičkim istraživanjima ispitan je utjecaj početne koncentracije imidakloprida (5, 10, 15 ppm), recirkulacije reakcijske smjese (100, 200, 300 mL/min) te vrste primijenjenog izvora zračenja (UVA-8W, UVA-15W, Arcadia-8W) na učinkovitost razgradnje. Plan eksperimenata pripremljen je pomoću računalnog programa Design-Expert, a tijek fotorazgradnje imidakloprida praćen je pomoću tekućinske kromatografije visoke učinkovitosti (HPLC). Iz dobivenih eksperimentalnih podataka izračunate su konverzije i procijenjene su pripadajuće konstante brzine reakcije dobivene prema predloženom kinetičkom modelu za reakciju pseudo prvog reda. Dobiveni eksperimentalni rezultati pokazali su da početna koncentracija onečišćivala pokazuje najveći utjecaj na fotokatalitičku razgradnju. Najveća konverzija i najveća konstanta brzine reakcije postignute su pri koncentraciji onečišćivala 5 ppm te pri recirkulaciji reakcijske smjese od 200 mL/min.

Abstract (english)

Increased need for food has resulted in intensive pesticide use. Uncontrolled use of pesticides causes their bioaccumulation in the environment, which leads to soil, air and water pollution and has a negative impact on human health. Since it is difficult to remove pesticides from water using conventional techniques and achieve strict criteria on permissible concentrations, advanced oxidation processes are used to remove pesticides from. water and wastewater, of which heterogeneous photocatalysis stands out. In this paper, the photocatalytic degradation of the neonicotinoid insecticide imidacloprid in aqueous solution was studied. The experiments were performed in an annular reactor with recirculation of the reaction mixture using an immobilized layer of TiO2 photocatalyst modified by previous exposure to UV-C radiation. The influence of the initial concentration of imidacloprid (5, 10, 15 ppm), recirculation of the reaction mixture (100, 200, 300 mL/min) and the type of applied radiation sources (UVA -8W, UVA -15W, Arcadia-8W) on the kinetic studies was investigated. The design of the experiments was prepared using the computer program Design-Expert and the course of photodegradation of imidacloprid was monitored using high performance liquid chromatography (HPLC). From the obtained experimental data, conversions were calculated and the corresponding reaction rate constants obtained according to the proposed kinetic model for the first order pseudo-reaction were estimated. The obtained experimental results showed that the initial concentration of pollutants shows the greatest influence on photocatalytic degradation. The highest conversion and the highest reaction rate constant were achieved at a pollutant concentration of 5 ppm and at a recirculation of the reaction mixture of 200 ml/min.

• Keywords: pesticidi; neonikotinoidi; imidakloprid; heterogena fotokataliza; titanijev (IV) oksid; DOE
• Keywords (english): pesticides; neonicotinoids; imidacloprid; heterogeneous photocatalysis; titanium (IV) oxide; DOE
• Language: croatian
• URN:NBN: urn:nbn:hr:149:721170
• 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: Materials Science and 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: Access restricted to students and staff of home institution
• Created on: 2023-02-26 13:04:19