Odstranjevanje atrazina iz pitne vode z vlakni iz aktivnega oglja

magistrsko delo

Mirjana Jeremić (Avtor), Marjana Simonič (Mentor), Andreja Goršek (Komentor)

Povzetek

Onesnaženost pitne vode s pesticidom atrazinom predstavlja kljub prepovedi njegove uporabe v Sloveniji leta 2003, velik problem. Povišane koncentracije atrazina so še vedno zabeležene predvsem v severovzhodnem delu Slovenije, kar je posledica intenzivnega poljedelstva. Namen magistrskega dela je bil preučiti uspešnost adsorpcije atrazina iz pitne vode na vlakna iz 100 % aktivnega oglja. Preučevali smo vpliv temperature in časa na učinkovitost adsorpcije atrazina na vlakna. Preveriti smo želeli, ali z modifikacijo vlaken dosežemo boljšo adsorpcijo. V raziskavi smo meritve višjih koncentracij atrazina (2,5 mg/L) v modelni vodi in pitni vodi določali spektrofotometrično. Nizke koncentracije atrazina (z začetno koncentracijo 1 μg/L) smo določali s plinsko kromatografijo. Učinkovitost adsorpcije atrazina smo interpretirali s pomočjo adsorpcijske kinetike in termodinamike. Rezultati raziskave so pokazali, da se koncentracija atrazina zniža od začetne koncentracije 2,5 mg/L na 0,8 mg/L pri sobni temperaturi in času 60 min. Z naraščanjem temperature se adsorpcija izboljša. Pri 30 °C se koncentracija atrazina zniža na 0,6 mg/L že po 40 min in pri 50 °C po 20 min, kar pomeni da se na vlakna adsorbira 76 % atrazina. Vrednosti ΔG0 so bile negativne, kar pomeni, da je reakcija potekla spontano. Negativne vrednosti ΔS0 dokazujejo, da je vpliv matriksa na vezavo atrazina zanemarljiv. Pri začetni koncentraciji atrazina 1,0 μg/L smo dosegli višje učinkovitosti, kot pri višjih koncentracijah . Na vlakna se je pri 22 °C po 20 min vezalo 90 % atrazina, po 60 min 95 %, in po 300 min 97 %. Adsorpcijo na vlakna iz aktivnega oglja lahko opišemo s kinetičnim modelom pseudo-drugega-reda.

Ključne besede

atrazin;adsorpcija;pitna voda;ogljikova vlakna;magistrske naloge;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2016
Tipologija:	2.09 - Magistrsko delo
Organizacija:	UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Založnik:	[M. Jeremić]
UDK:	628.179.2:661.183.2(043.2)
COBISS:	20320022
Št. ogledov:	1788
Št. prenosov:	107
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Atrazine removal from drinking water using activated carbon cloth
Sekundarni povzetek:	Pollution of drinking water with pesticide atrazine represents a large problem, despite the ban on its use in Slovenia since 2003. Elevated concentrations of atrazine are still being monitored, mainly in the north-eastern part of Slovenia as a consequence of intensive farming. The purpose of the master's thesis was to study the efficiency of atrazine adsorption from drinking water using cloth from 100 % activated carbon Zorflex® ACC FM30K. We studied the influence of temperature and time on the efficiency of atrazine adsorption on cloth. The aim was to study the influence of cloth modification on atrazine adsorption. In the research the measurements of atrazine concentrations in model and drinking water were defined spectrophotometrically. Low concentrations of atrazine (with the initial concentration of 1,0 μg/L) were defined with gas chromatography. The efficiency of atrazine adsorption was interpreted by menas of adsorption kinetics and thermodynamics. The results showed that at room temperature the atrazine concentration decreased from the initial concentration of 2,5 mg/L to 0,8 mg/L in 60 min. With increasing the temperature, the adsorption improved. The atrazine concentration decreased to 0,6 mg/L already after 40 min at 30 °C, and to the same concentration after 20 min at 50 °C, thus 76 % of atrazine was adsorbed on the cloth. The values of ΔG0 were negative, which meant that the reaction ran spontaneously. The negative values of ΔS0 proved that the matrix influence on the atrazine binding is negligible. At the initial concentration of 1,0 μg/L higher levels of efficiency were achieved than at higher atrazine concentrations. 90 % of atrazine was bound to the cloth after 20 min at 22 °C, after 60 min 95 %, and after 300 min 97 %. Atrazine adsorption was described by the pseudo-second-order kinetic model.
Sekundarne ključne besede:	atrazine;adsorption;drinking water;activated carbon;carbon cloth;SPE;
URN:	URN:SI:UM:
Vrsta dela (COBISS):	Magistrsko delo/naloga
Komentar na gradivo:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Strani:	IX, 53 str.
ID:	9221657