Remedijacija voda onečišćenih polistirenom

master's thesis

• Title (english): Remediation of water polluted by polystyrene
• Author: Katarina Stipković
• Mentor: Šime Ukić (mentor)
• Committee member: Šime Ukić (predsjednik povjerenstva)
• Committee member: Matija Cvetnić (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-09-20, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Potreba za plastikom iz godine u godinu raste. Posljedica intenzivne uporabe plastike i njenog neadekvatnog zbrinjavanja je sve veća količina plastike u okolišu. Jedna od većih prijetnji okolišu, posebice vodenim sustavima, su čestice plastike manje od 5 mm koje se nazivaju mikroplastikom (MP). Budući da se dosad upotrebljavane metode za uklanjanje MP-a iz voda nisu pokazale dovoljno učinkovitim, razmotrena je primjena naprednih oksidacijskih procesa. AOP-i su procesi u kojima dolazi do stvaranja vrlo reaktivnih radikala koji su u mogućnosti potpuno ili djelomično razgraditi organske onečišćujuće tvari iz vodenih medija. U ovome radu ispitana je razgradnja čestica MP-a polistirena (PS), veličine 25 - 100 μm, primjenom UV-C/H2O2 i UV-C/S2O82- procesa. Eksperimenti su provedeni prema potpunom faktorskom planu. FTIR spektroskopija provedena je za karakterizaciju PS-a, dok je za vodeni medij provedena TOC i MS analiza. Na temelju dobivenih rezultata odredio se učinkovitiji proces za razgradnju PS-a te optimalni uvjeti provođenja procesa. Prema dobivenim rezultatima učinkovitije oksidacijsko sredstvo u razgradnji PS-a je S2O82-. Ispitivanjem je utvrđeno kako je primjenom UV-C/S2O82- procesa moguće ostvariti tek minimalnu razgradnju mikročestica PS-a, a učinkovitost procesa ovisi o pH-vrijednosti medija, koncentraciji S2O82- te vremenu provedbe procesa.

Abstract (english)

The global need for plastics is continuously growing. The intensive use of plastics followed by later inadequate disposal is resulting in increasing amount of plastics in the environment. One of the biggest threats to the environment, especially to the aquatic one, are plastic particles smaller than 5 mm called microplastics (MP). Since applied methods for removing MP from water have not proven to be sufficiently effective, the application of advanced oxidation processes (AOP) has been considered. AOPs are processes in which highly reactive radicals are created. These radicals are able to decompose, organic pollutants from water, either partially or completely. AOP degradation of polystyrene (PS) microparticles in size 25 - 100 μm by UV-C/H2O2 and UV-C/S2O82- processes was studied. The experiments were conducted according to a full factorial design. FTIR spectroscopy was used for characterization of PS particles, while TOC and MS analysis were performed for analysis of the water solution. Based on the obtained results, a more efficient process for PS degradation and its optimal conditions were determined. According to the results, the more effective oxidizing agent for PS degradation is S2O82-. This study determined that only minimal decomposition of PS microparticles can be achieved by applying
UV-C/S2O82- treatment and the effectiveness of the process depends on pH value of the medium, concentration of S2O82- and treatment duration.

• Keywords: mikroplastika; polistiren; remedijacija voda; napredni oksidacijski procesi; UV-C/H2O2 obrada; UV-C/S2O82- obrada
• Keywords (english): microplastics; polysytrene; remediation of water; advanced oxidation processes; UV-C/H2O2 treatment; UV-C/S2O82- treatment
• Language: croatian
• URN:NBN: urn:nbn:hr:149:862805
• Project: Number: IP-2019-04-9661; Title: Primjena naprednih tehnologija obrade voda za uklanjanje mikroplastike; Title: Advanced Water Treatment Technologies for Microplastics Removal; Acronym: AdWaTMiR; Leader: Tomislav Bolanča; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Environmental chemistry and green technologies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-03-22 10:51:28