Determination of oxygen by means of a biogas and gas - interference study using an optical tris (4,7-diphenyl-1,10-phenanthroline) ruthenium(II) dichloride complex sensor

Polonca Brglez (Avtor), Andrej Holobar (Avtor), Aleksandra Pivec (Avtor), Nataša Belšak (Avtor), Mitja Kolar (Avtor)

Povzetek

Biogas is a mixture of gases produced by anaerobic fermentation where biomass or animal waste is decomposed and methane and carbon dioxide are mainly released. Biogas also has a very high moisture content (up to 80%), temperatures of around 60 °C, high pressure, and can contain other gases (N2, H2S, NH3 and H2). We searched for an appropriate measuring system for the determining of oxygen in biogas, since the production process of biogas must be run under anaerobic conditions; as the presence of oxygen decreases the quality of the biogas. Ruthenium (II) complexes are by far the most widely-used oxygen dyes within optical oxygen sensors. In general, they have efficient luminescences, relatively long-life metal-ligand charge-transfer excited states, fast response times, strong visible absorptions, large Stokes shifts, and high-photochemical stability. The purpose of this work was to characterise and optimize an optical oxygen sensor using tris (4,7-diphenyl-1,10-phenanthroline) ruthenium(II) dichloride complex for measuring oxygen. Different sensor properties were additionally studied, focusing on the interference of external light, temperature, and various gases. A special gas-mixing chamber was developed for gas interference study, and online experiments are presented for oxygen determination within the pilot biogas reactor.

Ključne besede

tris(4,7-diphenyl-1,10-phenanthroline)ruthenium(II) dichloride complex;oxygen optical sensor;interferences;biogas;

Podatki

Jezik:	Angleški jezik
Leto izida:	2012
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
UDK:	543.5
COBISS:	15889686
ISSN:	1318-0207
Št. ogledov:	1704
Št. prenosov:	86
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarni povzetek:	V prispevku predstavljamo optični senzor za določanje kisika, ki smo ga pripravili z nanosom tri (4,7 difenil-1,10-fenantrolin) rutenijevega(II) diklorida na PVC film. Občutljivost senzorja smo dodatno izboljšali s postavitvijo senzorja pod kotom 45°, zaradi povečane difuzije kisika in daljšega kontaktnega časa, v primerjavi s klasično postavitvijo senzorja pod kotom 180°. Optični senzor za določanje kisika se linearno odziva na 0, 25, 50, 75 in 100 % kisika v dušiku ($R^2$ = 0.9992, n = 3), znotraj celotnega koncentracijskega območja (y = 0.0766x + 0.0878). Interferenčne študije plinov so pokazale, da plini, ki so prisotni v bioplinu ne moti jo meritev, prav tako smo uspešno izvedli preliminarne meritve kisika v bioreaktorju. Razviti optični senzor za določanje kisika odlikuje enostavna uporaba, merjenje v nad in podtlačnih pogojih ter v plinastih in vodnih fazah.
Sekundarne ključne besede:	tris(4;7-difenil-1;10-fenantrolin)rutenij(II) dikloridni kompleks;optični senzor kisika;motnje;bioplin;
URN:	URN:NBN:SI
Vrsta dela (COBISS):	Znanstveno delo
Strani:	str. 50-58
Letnik:	ǂVol. ǂ59
Zvezek:	ǂno. ǂ1
Čas izdaje:	2012
Ključne besede (UDK):	mathematics;natural sciences;naravoslovne vede;matematika;chemistry;crystallography;mineralogy;kemija;analytical chemistry;analizna kemija;physicochemical methods of analysis (other than optical methods);
ID:	1439023