Primjena ferofluida u odstranjivanju mikroplastike iz voda

master's thesis

• Title (english): Use of ferrofluids in the removal of microplastics from waters
• Author: Darija Oštrić
• Mentor: Vladimir Dananić (mentor)
• Committee member: Vladimir Dananić (predsjednik povjerenstva)
• Committee member: Iva Movre Šapić (član povjerenstva)
• Committee member: Vesna Ocelić Bulatović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2023-02-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

U posljednje je vrijeme pojava mikroplastičnih čestica pod sve većim povećalom javnosti. Mikroplastika se nikada neće u potpunosti razgraditi, a negativno utječe na okoliš, ljudsko zdravlje te zdravlje drugih živih bića. Naime probavni sustav organizma ne može probaviti mikroplastiku što predstavlja rizik za ekosustav. Mikroplastika na sebe može vezati kemikalije iz okoliša, kao i bakterije i mikrobe koji potom mogu stvoriti biofilm. Upravo bi se zbog toga problem mikroplastike trebao ozbiljno shvatiti jer dođe li mikroplastika do ljudskog organizma ondje može otpustiti toksične spojeve kao i mikrobe koji su u njoj vezani, oštećujući time i ljudsko zdravlje. Kako bi se mikroplastika uklonila postoji nekoliko rješenja od kojih je u ovom radu predstavljena ekstrakcija mikroplastike ferofluidima. Ferofluidi predstavljaju vrlo snažnu magnetizirajuću tekućinu sastavljenu od tekućeg medija koji sadrži čvrste magnetske čestice vrlo male veličine, koloidno raspršene u tekućini nosača. Uklanjanje mikroplastike ferofluidima vrlo je efikasno jer se čak i najmanje čestice mikroplastike mogu vezati na ferofluid te se potom pomoću magneta mogu odstraniti. U ovom je radu korišten ferofluid na bazi sintetskog ulja te šest otopina mikroplastičnih čestica (polistirena (PS) i polivinil klorida (PVC)) u rasponu veličine od nešto manje od 300 μm do 500 μm. Dokazano je da je tehnika uklanjanja mikroplastike ferofluidom učinkovita i brza. Čestice polistirena imale su općenito bolju učinkovitost uklanjanja od čestica polivil klorida. Također je ustvrđeno da se veće čestice od 355-500 μm bolje ekstrahiraju od manjih čestica manje od 300 μm.

Abstract (english)

Recently, the appearance of microplastic particles has come under increasing public scrutiny. Microplastics cannot be completely decomposed, and they have a negative impact on the environment, human health, and the health of other living beings. Namely, the digestive system of the organism cannot digest microplastics, which represents a health risk for the ecosystem. Microplastics can bind chemicals from the environment, as well as bacteria and microbes that then create a biofilm. It is precisely for this reason that the problem of microplastics should be taken seriously, because if microplastics reach the human body, they can release toxic compounds as well as the microbes bound in it, damaging human health. In order to remove microplastics, there are several solutions, of which the extraction of microplastics with ferrofluids is presented in this paper. Ferrofluids represent a very strong magnetizing liquid composed of a liquid medium, containing solid magnetic particles of very small size, colloidally dispersed in a liquid carrier. The removal of microplastics with ferrofluids is very effective because even the smallest particles of microplastics can bind to the ferrofluid and be removed using a magnet. In this work, ferrofluid based on synthetic oil and six solutions of microplastic particles (polystyrene (PS) and polyvinyl chloride (PVC)) in the size range from slightly less than 300 μm to 500 μm were used. The microplastic removal technique with ferrofluid has been proven to be effective and fast. Polystyrene particles had generally better removal efficiency than polyvinyl chloride particles. It was also found that larger particles of 355-500 μm are easier to extracted than smaller particles of less than 300 μm.

• Keywords: mikroplastika; ferofluidi; zaštita okoliša
• Keywords (english): microplastics; ferrofluids; environmental protection
• Language: croatian
• URN:NBN: urn:nbn:hr:149:290429
• Study programme: Title: Applied Chemistry - Graduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and 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: 2023-03-10 12:46:29