Izučavanje adsorpcije imidakloprida na površinu fotokatalizatora

undergraduate thesis

• Title (english): Study of imidacloprid adsorption on the surface of photocatalysts
• Author: Lucia Sović
• Mentor: Vanja Kosar (mentor)
• Committee member: Vanja Kosar (predsjednik povjerenstva)
• Committee member: Vesna Tomašić (član povjerenstva)
• Committee member: Davor Dolar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2021-09-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Razina insekticida u vodi porasla je zbog njihove prekomjerne upotrebe u suvremenoj poljoprivredi. Odabir prikladne metode obrade vode za uklanjanje insekticida ovisi o vrsti insekticida i učinkovitosti postupka obrade. Cilj ovoga rada je razmotriti adsorpciju neonikotinoida imidakloprida na površini čvrstog TiO2 katalizatora kao nužan predkorak pri procesu fotokatalitičke razgradnje te ustanoviti utjecaj pojedinih procesnih uvjeta na učinak iste na temelju provedenih eksperimenata. Prema planu eksperimenta (Box-Behnkenovom dizajnu), provedene su adsorpcije uz različite kombinacije odabranih parametara koje su generirane nasumično. Ti parametri bili su pH otopine, koncentracija otopina imidakloprida i recirkulacija otopine, odnosno hidrodinamički uvjeti. Priprema katalizatora, na čijoj površini se odvijala adsorpcija, sastojala se od pripreme guste suspenzije fotokatalizatora P-25 TiO2 i punila procola do postizanja željene teksture te nanošenja te smjese na brusni papir željenih dimenzija. Analiza uzoraka provodila se pomoću HPLC (eng. High Performance Liquid Chromatography) uređaja te su dobivene vrijednosti obrađivane statističkom "ANOVA" analizom. Rezultati su pokazali da je najveći utjecaj na doseg adsorpcije imala je pH vrijednost otopina, a statističkom analizom predložen je kvadratni model koji ukazuje na utjecaj dvaju parametara na proces adsorpcije, a to su upravo pH vrijednosti i koncentracije otopina. Prema izračunatim vrijednostima maksimalni doseg adsorpcije iznosio je 20%.

Abstract (english)

Concentrations of aquatic insecticides have increased due to their overuse in modern agriculture. The choice of an appropriate water treatment method for insecticide removal depends on the type of insecticide and the effectiveness of the treatment process. The aim of this paper is to consider the adsorption of imidacloprid neonicotinoids on the surface of a solid TiO2 catalyst as one of the methods for pretreatment of polluted water, and to determine the influence of individual process conditions on the effect by means of experiments. According to the experimental design (Box-Behnken design), the adsorption reactions were carried out with different combinations of selected parameters, which were randomly generated. These parameters were the pH of the solution, the concentration of the imidacloprid solution and the recirculation of the solution, i.e. the hydrodynamic conditions. The preparation of the catalyst, on the surface of which the adsorption took place, consisted of preparing a thick suspension of the photocatalyst P-25 TiO2 and the filler Procol until the desired texture was obtained, and the mixture was applied to sandpaper of desired dimensions. The analysis of the samples was carried out using an HPLC (High Performance Liquid Chromatography) instrument and the values obtained were processed by the statistical "ANOVA" analysis. The results showed that the pH of the solutions had the greatest influence on the range of the adsorption, and the statistical analysis proposed a quadratic model indicating the influence of two parameters on the adsorption process, namely pH values and solution concentrations. According to the calculated values, the maximum adsorption range was 20%.

• Keywords: adsorpcija; imidakloprid; TiO2 katalizator; pH vrijednost; koncentracija; recirkulacija
• Keywords (english): adsorption; imidacloprid; TiO2 catalyst; pH value; concentration; recirculation
• Language: croatian
• URN:NBN: urn:nbn:hr:149:052957
• 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: 2023-04-20 11:39:23