Fotorazgradnja tiakloprida u pločastom fotoreaktoru

undergraduate thesis

• Title (english): Photodegradation of thiacloprid in a flate-plate photoreactor
• Author: Dominik Horvatić
• Mentor: Vesna Tomašić (mentor)
• Committee member: Vesna Tomašić (predsjednik povjerenstva)
• Committee member: Marina Duplančić (član povjerenstva)
• Committee member: Sandra Babić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-09-07, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Pesticid je svaka otrovna kemijska tvar koja se koristi za suzbijanje životinja, gljiva ili biljaka koje nanose ekonomsku štetu usjevima ili biljkama ili su opasne po zdravlje domaćih životinja i ljudi. Sve veće količine pesticida koje se unose u okoliš uzrokuju povećanu koncentraciju štetnih organskih i anorganskih spojeva u vodi, zraku, tlu i industrijskim otpadnim tokovima zbog čega fotokatalitički procesi imaju sve veću primjenu u svrhu razgradnje štetnih spojeva. Cilj ovog rada bio je analizirati i usporediti učinkovitost fotokatalitičke razgradnje tiakloprida pri različitim radnim uvjetima te ispitati mogućnosti poboljšanja učinkovitosti razgradnje. Fotokatalitička razgradnja tiakloprida provedena je u pločastom fotoreaktoru uz primjenu imobiliziranog sloja TiO2 kao fotokatalizatora. Ispitan je utjecaj pH vrijednosti početne reakcijske smjese na učinkovitost fotokatalitičke razgradnje tiakloprida, a u svrhu usporedbe provedena je i reakcija fotolize, odnosno razgradnje bez prisutnosti fotokatalizatora. Nađeno je da je razgradnja tiakloprida najučinkovitija pri početnoj pH vrijednosti reakcijske smjese 4,5-5,5 te da fotolizom (bez prisutnosti fotokatalizatora) dolazi do minimalne razgradnje tiakloprida. Također, ustanovljeno je da prethodna ultrazvučna obrada reakcijske smjese povećava učinkovitost razgradnje.

Abstract (english)

Pesticide is any toxic chemical substance used to kill animals, fungi, or plants that cause economic damage to crop or plants or are hazardous to the health of domestic animals or humans. Increasing amounts of pesticides that are introduced into the environment cause an increased concentration of harmful organic and inorganic compounds in water, air, soil and industrial waste streams, which is why photocatalytic processes are increasingly used for the decomposition of harmful compounds. The aim of this study was to analyze and compare the efficiency of photocatalytic degradation of thiacloprid under different operating conditions and to examine the possibilities of improving the degradation efficiency. Photocatalytic degradation of thiacloprid was performed in a flate-plate photoreactor using an immobilized TiO2 as a photocatalyst. The influence of the pH value of the initial reaction mixture on the efficiency of photocatalytic degradation of thiacloprid was investigated, and for the purpose of comparison, the reaction of photolysis (degradation without the presence of photocatalyst) was performed. It was found that the degradation of thiacloprid is most effective at an initial pH of the reaction mixture of 4,5-5,5 and that photolysis (without the presence of photocatalyst) results in minimal degradation of thiacloprid. Also, it was found that pre-ultrasonic treatment of the reaction mixture increases the degradation efficiency.

• Keywords: tiakloprid; fotokatalizator; heterogena fotokataliza; fotoliza; fotoreaktor; titanijev (IV) oksid (TiO2)
• Keywords (english): thiacloprid; photocatalyst; heterogeneous photocatalysis; photolysis; photoreactor; titanium (IV) oxide (TiO2)
• Language: croatian
• URN:NBN: urn:nbn:hr:149:375850
• 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: 2023-03-29 11:55:33