Utjecaj molekularnog blokiranja heksilaminom na poboljšanje performansi komercijalnih reverzno osmotskih membrana

master's thesis

• Title (english): Enhancing commercial reverse osmosis membranes performance: Investigating the impact of molecular plugging with hexylamine
• Author: Dominik Grganović
• Mentor: Krešimir Košutić (mentor)
• Committee member: Krešimir Košutić (predsjednik povjerenstva)
• Committee member: Marica Ivanković (član povjerenstva)
• Committee member: Vladimir Dananić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2024-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Reverzna osmoza (RO) jedna je od najefikasnijih tehnologija za desalinaciju i pročišćavanje vode, no suočava se s izazovima pri uklanjanju malih, neutralnih molekula poput
N-nitrozamina (NTR), koji su potencijalno kancerogeni i opasni po ljudsko zdravlje. Tradicionalne RO membrane imaju ograničenu sposobnost zadržavanja tih spojeva, što zahtijeva inovativne pristupe u njihovoj modifikaciji. Ovaj rad istražuje metodu molekularnog blokiranja uz primjenu heksilamina (HEX) i heksametildiamina (HDMA) kako bi se povećalo zadržavanje NTR-a na RO membranama. Uvođenje ovih molekularnih blokatora unutar poliamidnog sloja tanko-slojnih RO membrana ima potencijal značajno poboljšati selektivnost i efikasnost membrana prema neutralnim molekulama NTR-a, a posebno
N-nitrozodimetilamina (NDMA) koji je najmanji među njima. Primjena HEX-a i HDMA dovela je do promjena u raspodjeli veličine pora i broju učinkovitih pora, što je rezultiralo smanjenjem propusnosti membrane (od 5 do 33%), uz zadržavanje razine pogodnih za RO procese. HEX i HDMA su pokazali pozitivan učinak na zadržavanje NTR-a s membranama ACM1, ACM5 i BW30LE. Posebno se zadržavanje NDMA s ACM1 poboljšalo za 65,5% i 70,6% nakon tretmana s HEX-om i HDMA-om.

Abstract (english)

Reverse osmosis (RO) is one of the most efficient technologies for desalination and water purification, but it faces challenges in removing small, neutral molecules like N-nitrosamines (NTRs), which are potentially carcinogenic and hazardous to human health. Traditional RO membranes have limited ability to retain these compounds, necessitating innovative modification approaches. This study explores molecular plugging using hexylamine (HEX) and hexamethylenediamine (HDMA) to enhance NTR retention on RO membranes. Introducing these molecular plugs within the polyamide layer of thin-film RO membranes significantly improves selectivity and efficiency towards neutral NTR molecules, particularly the smallest, N-nitrosodimethylamine (NDMA). The application of HEX and HDMA led to changes in pore size distribution and the number of effective pores, resulting in a decrease in membrane permeability (from 5 to 33%), while maintaining levels suitable for RO processes. HEX and HDMA exhibited a positive effect on NTR rejection with ACM1, ACM5, and BW30LE membranes. Specifically, NDMA retention was improved by 65.5% and 70.6% with ACM1 after treatment with HEX and HDMA, respectively.

• Keywords: reverzna osmoza; N-nitrozamini; molekularno blokiranje; modificiranje membrana; zadržavanje
• Keywords (english): reverse osmosis; N-nitrosamines; molecular plugging; membrane modification; retention
• Language: croatian
• URN:NBN: urn:nbn:hr:149:133696
• Study programme: Title: Environmental Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka ekoinženjerstva (sveučilišni/a magistar/magistra inženjer/inženjerka ekoinženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-11-07 10:05:10