Sinteza i primjena mezoporoznog SBA-15 dopiranog kadmijem za fotorazgradnju neonikotinoidnog insekticida imidakloprida

master's thesis

• Title (english): Synthesis and application of mesoporous cadmium doped SBA-15 for photodegradation of neonicotinoid insecticide imidacloprid
• Author: Marija Raič
• Mentor: Vesna Tomašić (mentor)
• Committee member: Vesna Tomašić (predsjednik povjerenstva)
• Committee member: Filip Car (član povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Pesticidi su otrovne kemikalije koje se namjerno puštaju u okoliš te onečišćuju zrak, tlo i vodu. Svaki je pesticid namijenjen uništavanju određenih nametnika, no vrlo veliki postotak dospije na neciljano odredište. Iako postoje različiti postupci za uklanjanje pesticida iz okoliša, najviše se ističu napredni oksidacijski procesi odnosno heterogena fotokataliza. Razvoj naprednih materijala za primjenu u heterogenoj fotokatalizi zahtijeva kontrolu nad sintezom i strukturnim parametrima aktivnog mjesta. Najveću pozornost, kao jedni od naprednih materijala, privukli su mezoporozni materijali od silicijevog dioksida. Oni se smatraju bitnom skupinom nanostrukturiranih potpornih materijala u heterogenoj fotokatalizi. Općenito, mezoporozni silicijev dioksid, SBA-15, ima široku primjenjivost u fotokatalizi zbog svojih relativno debljih stijenki, morfologije, kemijske stabilnosti i poroznosti što dovodi do veće toplinske i mehaničke stabilnosti. U ovom radu provedena je sinteza, karakterizacija i testiranje fotokatalitičke aktivnosti hibridnih fotokatalizatora (-SBA-15, Cd/SBA-15 i CdS/SBA-15) s ciljem smanjenja širine zabranjene zone i brzine rekombinacije parova elektron – šupljina (e-/h+) te postizanje zadovoljavajuće aktivnosti tako pripremljenih uzoraka za fotokatalitičku razgradnju imidakloprida uz primjenu UVA zračenja te provedbom reakcije u šaržnom fotoreaktoru.

Abstract (english)

Pesticides are toxic chemicals that are deliberately released into the environment and pollute the air, soil, and water. Each pesticide is intended to destroy certain pests, but an exceptionally large percentage arrives at an unintended destination. Although there are different procedures for removing pesticides from the environment, advanced oxidation processes stand out the most especially heterogeneous photocatalysis. Development of advanced materials for application in heterogeneous photocatalysis requires control over synthesis and structural parameters of the active site. The greatest attention, as one of the advanced materials, have mesoporous silica materials. They are considered an essential class of nanostructured support materials in heterogeneous photocatalysis. In general, mesoporous silica, SBA – 15, has wide applicability in photocatalysis due to its relatively thicker walls, morphology, chemical stability, and porosity which leads to greater thermal and mechanical stability. In this paper, the synthesis, characterization and testing of photocatalytic activity of hybrid photocatalysts (-SBA-15, Cd/SBA-15 and CdS/SBA-15) were carried out with the aim of reducing the band gap and the rate of recombination of electron-cavity pairs (e-/h+) and achieving satisfactory activity of the thus prepared samples for the photocatalytic degradation of imidacloprid with the application of UVA radiation and by carrying out the reaction in a batch photoreactor.

• Keywords: pesticidi; imidakloprid; fotokatalitička razgradnja; mezoporozni SBA-15; kadmij
• Keywords (english): pesticides; imidacloprid; photocatalytic degradation; mesoporous SBA-15; cadmium
• Language: croatian
• URN:NBN: urn:nbn:hr:149:819670
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-11-24 08:55:32