Aminska funkcionalizacija poroznih kovinsko-organskih materialov za učinkovit zajem in ponovno uporabo CO₂ pri nizkih koncentracijah

Polak, Jan (avtor), Mazaj, Matjaž (mentor), Meden, Anton (komentor)

Kovinsko-organske porozne materiale (MOF-e) odlikujejo velika specifična površina, velika raznolikost poroznih struktur in možnost kemijskega prilagajanja adsorpcijskih mest. Zaradi teh lastnosti MOF-i predstavljajo obetavne adsorbente za neposredni zajem CO2 iz zraka, pri katerem je ključna učinkovita in selektivna adsorpcija pri koncentracijah CO2 od 400 do 2000 ppm. V okviru mojega magistrskega dela sem na izbranih MOF sistemih sistematično raziskoval vpliv funkcionalizacije z aminskimi spojinami, kot so glicin, tetraetilpentamin (TEPA) in polietilenimin (PEI) na učinkovitost zajema pri nizkih koncentracijah CO2. Pripravljeni materiali so bili okarakterizirani s praškovno rentgensko difrakcijo, termogravimetrično analizo in infrardečo spektroskopijo s Fourierjevo transformacijo. V nadaljevanju so bile izmerjene CO2 adsorpcijske izoterme, na podlagi katerih je bil ovrednoten vpliv funkcionalizacije na sposobnost zajema CO2 pri koncentracijah do 2000 ppm. Pri funkcionaliziranih vzorcih z izboljšano adsorpcijo CO2 v primerjavi z osnovnimi MOF sistemi so bile dodatno izmerjene adsorpcijske izoterme z dušikom, iz katerih so bile določene specifične površine po BET metodi. Preverjena je bila tudi regeneracijska sposobnost materialov po več zaporednih ciklih adsorpcije in desorpcije CO2. Ker vodna para v realnih pogojih pomembno vpliva na adsorpcijo CO2, so bile izmerjene tudi adsorpcijske izoterme vode in ocenjeno delovanje zajema CO2 v prisotnosti vlage.

• Jezik: Slovenski jezik
• Ključne besede: posintezna funkcionalizacija, amini, kovinsko-organski porozni materiali, CO2, adsorbenti
• Vrsta gradiva: Magistrsko delo/naloga
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo
• Leto izida: 2026
• PID: 20.500.12556/RUL-187350
• Datum objave v RUL: 10.09.2026

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Amino functionalization of porous metal-organic materials for efficient capture and reuse of CO₂ at low concentrations

Izvleček

Metal-organic frameworks (MOFs) are characterized by a large specific surface area, a wide variety of porous structures, and the ability to chemically tailor their adsorption sites. Due to these properties, MOFs represent promising adsorbents for direct CO2 capture from the air, where efficient and selective adsorption at CO2 concentrations ranging from 400 to 2000 ppm is crucial. As part of my master’s thesis, I systematically investigated the effect of functionalization with amine compounds–such as glycine, tetraethylpentylamine (TEPA), and polyethyleneimine (PEI)– on capture efficiency at low CO2 concentrations using selected MOF systems. The prepared materials were characterized using selected MOF systems. The prepared materials were characterized using X-ray diffraction, thermogravimetric analysis and Fourier transform infrared spectroscopy. Subsequently, CO2 adsorption isotherms were measured, based on which the effect of functionalization on CO2 capture capacity at concentrations up to 2000 ppm was evaluated. For the functionalized samples exhibiting improved CO2 adsorption compared to the basic MOF systems, nitrogen adsorption isotherms were additionally measured, from which the specific surface areas were determined using the BET method. The regeneration capacity of materials after multiple consecutive cycles of CO2 adsorption and desorption was also tested. Since water vapor significantly affects CO2 adsorption under real-world conditions, water adsorption isotherms were also measured, and CO2 capture performance in the presence of moisture was evaluated.

• Ključne besede: Post-synthetic functionalisation, amines, metal organic frameworks, CO2, adsorbents