Uklanjanje pesticida s NF membranama iz demineralizirane vode

undergraduate thesis

• Title (english): Retention of pesticides with NF membranes from demineralized water
• Author: Klara Karadakić
• Mentor: Davor Dolar (mentor)
• Committee member: Davor Dolar (predsjednik povjerenstva)
• Committee member: Danijela Ašperger (član povjerenstva)
• Committee member: Lidija Furač (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Mechanical, Thermal and Separation Processes

Abstract

U današnje vrijeme velik dio kemijske industrije usredotočen je na proizvodnju pesticida u svrhu omogućavanja poljoprivredi, i drugim sličnim djelatnostima, da zadovolji potrebe velike populacije ljudi na Zemlji. Uz taj proces proizvodnje veže se i problem zbrinjavanja produkata koji nastaju djelovanjem navedenih pesticida u okolišu kao i problem zagađenja koji uzrokuju. Zagađenje uzrokovano pesticidima podrazumijeva onečišćenje prirodnih voda i tla stoga se u svrhu zaštite i pročišćavanja sve više koriste metode kao što su nanofiltracija (NF). Svrha ovog istraživanja bila je ispitati uklanjanje i mehanizam uklanjanja odabranih pesticida (tiametoksam, imidakloprid, klotianidin, acetamiprid, oksadiazon, tiakloprid i tri-alat) sa 6 različitih NF membrana (DK, HL, KH, DL, NF90 i NF270). Navedeni pesticidi su odabrani jer se nalaze na Popisu praćenih tvari za koje je potrebno praćenje diljem Unije u području vodne politike u skladu s Direktivom 2008/105/EZ Europskog parlamenta i Vijeća. Dobiveni rezultati pokazali su širok raspon uklanjanja navedenih pesticida (od 6% do preko 97%) koji je uvelike ovisio o njihovoj molarnoj masi, odnosno samoj veličini molekule, log KO/W, polarnosti molekule pesticida, odnosno njihovom dipolnom momentu, mjerenom fluksu, veličini pora i hidrofobnosti membrane. Karakteristike membrana određivane su mjerenjem kontaktnog kuta (određivanje hidrofilnosti/hidrofobnosti) i zeta potencijala (naboja membranske površine). Naime, što je pesticid bio hidrofobnijeg karaktera, vezanje na membrane bilo je značajnije, što je dokazano provedbom FTIR analize. Zaključno, najveći faktor separacije ostvaruje se kod pesticida većih molekulskih masa pogotovo ako se za proces separacije koriste NF membrane značajnog hidrofilnog karaktera.

Abstract (english)

Nowadays, a big part of chemical industry is focused on manufacture of pesticides for purpose of enabling agriculture, and other similar industries, to satisfy needs of a big population on Earth. That manufacturing process is associated with a problem of taking care of products which are developed by pesticides activity as well as a problem with pollution which they produce. Pollution caused by pesticides implicates contamination of natural water and soil so in order to protect and purge them there is an increasing use of methods like nanofiltration (NF). Purpose of this research was to examine the removal and removal mechanisms between selected pesticides (thiamethoxam, imidacloprid, clothianidin, acetamiprid, oxadiazon, thiacloprid and tri-allate) and 6 different nanofiltration membranes (DK, HL, KH, DL, NF90 i NF270). Pesticides were selected because they are listed on Watch list of substances for Union-wide monitoring in the field of water policy pursuant to Directive 2008/105/EC of the European Parliament and of the Council. Results obtained have shown wide range of removal of listed pesticides (from 6% to over than 97%) which has greatly depended of their molecule mass, i.e. size of molecule, log Kow, the polarity of molecules, i.e. their dipole moment, flux that was measured, the size of membrane pores and hydrophobicity of membrane. Membrane characteristics were detected by determining contact angle (determining hydrophilicity/ hydrophobicity) and zeta potential (charge of membrane surface). In fact, the greater the hydrophobic character of pesticide was, the better the bonding was on a membrane surface, which was proved with analysis on FTIR. In conclusion, the greater separation factor is achieved with pesticides that have bigger molecule mass, especially if for process are used NF membranes with big hydrophilic character.

• Keywords: nanofiltracija; pesticidi; separacija; mehanizam uklanjanja
• Keywords (english): nanofiltration; pesticides; separation; interactions
• Language: croatian
• URN:NBN: urn:nbn:hr:149:044163
• Project: Number: PKP-2016-06-8522; Title: Izravna oporaba komunalne otpadne vode za navodnjavanje membranskim tehnologijama; Acronym: ReHOHMem; Leader: Davor Dolar; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: PKP
• Study programme: Title: Applied Chemistry - Undergraduate 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: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-05-09 12:37:56