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Title: Proučevanje eno in večkovinskih katalizatorjev na silikatnem nosilcu v naprednem oksidacijskem procesu za čiščenje odpadnih voda : magistrsko delo Authors: ID Kozjan, Sara (Author) ID Novak Tušar, Nataša (Mentor) More about this mentor... ID Pintar, Albin (Mentor) More about this mentor... Files: Sara_Kozjan.pdf (2,43 MB) MD5: 03C329C6D8B52E6CF3CEE261620A4C02   Language: Slovenian Work type: Master's thesis/paper Typology: 2.09 - Master's Thesis Organization: FN - School of Science Abstract: Ena izmed glavnih onesnaževal v odpadnih vodah so strupene organske spojine, katerih količina se z industrijskim razvojem nenehno povečuje. Najbolj nevarna so tako imenovana zaskrbljujoča onesnaževala (CEC – Contaminants of Emerging Concern), med katerimi so najpogostejših farmacevtski izdelki in izdelki za osebno nego. Za učinkovito odstranjevanje le-teh se raziskave osredotočajo na napredne oksidacijske procese (Advanced Oxidation Processes – AOP), ki s pomočjo katalizatorjev in oksidantov organska onesnaževala oksidirajo v ogljikov dioksid, vodo in mineralne kisline. Magistrska naloga se nanaša na proučevanje eno, dvo in trikovinskih katalizatorjev na silikatnem nosilcu. Kovine, ki smo jih proučevali, so bile baker, mangan in železo. Katalizatorji so bili sintetizirani na Odseku za anorgansko kemijo in tehnologijo na Kemijskem inštitutu. Katalizatorje smo najprej ovrednotili z osnovnimi karakterizacijskimi metodami, kot so rentgenska difrakcija (XRD – X-Ray Diffraction), dušikova fizisorpcija in vrstična elektronska mikroskopija (SEM – Scanning Electron Microscopy). Ugotovili smo, da imajo višjo vsebnost kovin skoraj vsi kalcinirani katalizatorji v primerjavi z ekstrahiranimi in kalciniranimi katalizatorji, kar lahko pripišemo ekstrakcijskemu postopku, med katerim se najverjetneje odstrani določeno množino kovin iz katalizatorjev. Postopek priprave bistveno ne vpliva na specifično površino, velikost por in volumen por katalizatorjev. Pri kalciniranih katalizatorjih, ki vsebujejo Cu, je le-ta prisoten v obliki CuO. Katalitske teste sem izvedla na dveh modelnih onesnaževalih iz skupine CEC in sicer na kumarinu (Fenton in foto-Fenton AOP) in glifosatu (Fenton AOP). Ugotovila sem, da so v primeru obeh uporabljenih modelnih onesnaževal najbolj učinkoviti dvokovinski katalizatorji in sicer pri kumarinu katalizator s Cu in Mn ter pri glifosatu katalizator s Cu in Fe. Pri kumarinu katalizator s Cu in Mn kaže tudi na fotokatalitsko aktivnost pri obsevanju z vidno svetlobo. Prav tako sem ugotovila, da so tako kot pri kumarinu tudi pri glifosatu bolj učinkoviti kalcinirani katalizatorji v primerjavi z ekstrahiranimi in kalciniranimi katalizatorji. To lahko pripišemo višji vsebnosti kovin ali/in prisotnosti Cu specij v obliki CuO v kalciniranih katalizatorjih. To ugotovitev bi bilo potrebno v nadaljevanju podrobneje raziskati. Keywords: čiščenje odpadnih voda, napredni oksidacijski procesi, heterogena kataliza, katalizatorji na silikatnem nosilcu, glifosat, kumarin Publication status: Published Publication version: Version of Record Place of publishing: Nova Gorica Place of performance: Nova Gorica Publisher: S. Kozjan Year of publishing: 2024 Year of performance: 2024 Number of pages: XIV, 49 str. PID: 20.500.12556/RUNG-9127  COBISS.SI-ID: 207119107  UDC: 544.5/.6 NUK URN: URN:SI:UNG:REP:BH497S6B Publication date in RUNG: 11.09.2024 Views: 516 Downloads: 9 Metadata:     Cite this work Plain text BibTeX EndNote XML EndNote/Refer RIS ABNT ACM Ref AMA APA Chicago 17th Author-Date Harvard IEEE ISO 690 MLA Vancouver : Copy citation

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License:	CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:	http://creativecommons.org/licenses/by-nc-nd/4.0/
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Licensing start date:	13.06.2024

Secondary language

Language:	English
Title:	Study of single and multi-metal catalysts on a silica support in advanced oxidation processes for wastewater treatment
Abstract:	One of the most important wastewater pollutants are toxic organic compounds, whose emissions continue to increase with industrial development. The most dangerous are the so-called Contaminants of Emerging Concern (CEC), which mainly include pharmaceuticals and personal care products. To effectivelly eliminate CEC, research focuses on advanced oxidation processes (AOP), which use catalysts and oxidants to oxidize organic pollutants to carbon dioxide, water, and mineral acids. The present master thesis refers to the investigation of single, double, and triple-metal catalysts on a silicate support. The metals studied are copper, manganese and iron. The catalysts were synthesized in the Department of Inorganic Chemistry and Technology at the National Institute of Chemistry, Ljubljana, Slovenia. The catalysts were first studied using basic characterization methods such as X-ray diffraction (XRD), nitrogen physisorption, and scanning electron microscopy (SEM). We found that almost all calcined catalysts have a higher metal content than extracted and calcined catalysts. This can be attributed to the extraction process which most likely removes a certain amount of metals from the catalysts. The preparation process has no significant influence on the specific surface area, pore size and pore volume of the catalysts. In the calcined catalysts containing copper, copper is present as CuO. I carried out catalytic tests with two model pollutants from the CEC group: Coumarin (Fenton and photo-Fenton AOP) and Glyphosate (Fenton AOP). I found that for both model pollutants, the most effective catalysts were the two-metal catalysts, namely the Cu-Mn catalyst for coumarin and the Cu-Fe catalyst for glyphosate. For coumarin, the Cu-Mn catalyst also shows photocatalytic activity when irradiated with visible light. As with coumarin, the calcined catalysts are also more effective for glyphosate than the extracted and calcined catalysts. This may be attributed to the higher metal content and/or the presence of Cu species in the form of CuO in the calcined catalysts. This finding should be investigated further.
Keywords:	wastewater purification, advanced oxidation processes, heterogeneous catalysis, catalysts on silicate support, glyphosate, coumarin

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