Fotokatalitska razgradnja antibiotika tetraciklina s tankimi plastmi titanovega dioksida

Šifrer, Klara (author), Lavrenčič Štangar, Urška (mentor)

Tekom diplomskega dela sem pripravila sol titanovega dioksida po anorganski sintezni poti iz TiCl4 z dodatkom NH4NO3 in hidroksipropil celuloze. Z dušikom dopirane fotokatalitsko aktivne tanke plasti sem pripravila tako, da sem nastali sol s tehniko potapljanja podlage nanesla na objektna stekla in jih nato termično obdelala pri temperaturi 600 °. Nastale plasti sem uporabila za fotokatalitsko razgradnjo antibiotika oksitetraciklina pod UV svetlobo z valovno dolžino 350 nm. Razgradnjo antibiotika sem spremljala spektrofotometrično na 15 minut; celotni čas fotokatalitske razgradnje pa je bil 3 ure. Razgradnjo onesnažila v vodovodni in deionizirani vodi sem spremljala na osnovi meritev absorpcijskih spektrov učinkovine v območju med 200 in 800 nm. Opazovala sem vpliv pH raztopine in začetne koncentracije onesnažila na hitrost razgradnje. Naredila sem tudi umeritvene krivulje oksitetraciklina v deionizirani in vodovodni vodi, iz katerih lahko iz izmerjene absorbance pri valovni dolžini 355 nm (deionizirana voda) oziroma 375 nm (vodovodna voda) določamo koncentracijo oksitetraciklina v raztopini. Iz meritev absorbcijskih spektrov teh raztopin pred in po triurnem osvetljevanju z UV svetlobo sem lahko določila še spontano razgradnjo oksitetraciklina na UV svetlobi.

• Language: Slovenian
• Keywords: titanov dioksid, sol-gel postopek, tanke plasti, fotokatalitska razgradnja, oksitetraciklin
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2020
• PID: 20.500.12556/RUL-119635
• COBISS.SI-ID: 29861379
• Publication date in RUL: 10.09.2020

ŠIFRER, Klara, 2020, Fotokatalitska razgradnja antibiotika tetraciklina s tankimi plastmi titanovega dioksida [online]. Bachelor’s thesis. [Accessed 17 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=119635

Secondary language

• Language: English
• Title: Photocatalytic degradation of antibiotic tetracycline by thin films of titanium dioxide

Abstract

During my diploma work, titanium dioxide sol was prepared by inorganic synthesis route from TiCl4 with addition of NH4NO3 and hydroxypropyl cellulose. The prepared sol was deposited onto object glasses by dip-coating technique. After thermal treatment at 600 °C nitrogen-doped photocatalytically active thin films were prepared. These layers were then used for the photocatalytic degradation of the antibiotic oxytetracycline under UV light irradiation with a wavelength of 350 nm. The antibiotic degradation was measured spectrophotometrically every 15 minutes; the total time of photocatalytic degradation was 3 hours. The degradation of the contaminant in tap water and deionized water was monitored, based on the obtained absorption spectra of the active substance in the range between 200 and 800 nm. The influence of the pH of the solution and the initial concentration of the contaminant on the degradation rate was investigated. Calibration curves of oxytetracycline in deionized water and tap water were also constructed, from which the concentration of oxytetracycline in the solution can be determined from the measured absorbance at a wavelength of 355 nm (deionized water) and 375 nm (tap water). From the absorption spectra of these solutions before and after irradiation with UV light for three hours, the spontaneous degradation of oxytetracycline in UV light can also be followed.

• Keywords: titanium dioxide, sol-gel method, thin film, photocatalytic degradation, tetracycline