Adsorpcija težkih kovin na biooglje

magistrsko delo

Andreja Sever (Avtor), Mojca Škerget (Mentor), Matjaž Finšgar (Komentor)

Povzetek

Namen diplomskega dela je bil preučiti adsorpcijske lastnosti biooglja, pridobljenega iz odpadne biomase s postopkom hidrotermične karbonizacije (HTC), za adsorpcijo težkih kovin, in sicer Cd2+ in Pb2+ ionov. Kot odpadni biomaterial smo uporabili lubje listavca z velikim deležem taninov, skorjo kostanja. Določili smo izkoristek biooglja pridobljenega s HTC ter izmerili zeta potencial, specifično površino, volumen por, povprečni premer por in velikost delcev. Biooglje smo pripravili brez in z dodatkom ocetne kisline in rezultate med seboj primerjali. Povprečni izkoristek in masa obeh pridobljenih vzorcev sta bila podobna. Nato smo izvedli ravnotežno adsorpcijo Cd2+ in Pb2+ ionov v odvisnosti od pH in koncentracije izhodne raztopine. Ravnotežna adsorpcija Pb2+ ionov v odvisnosti od pH je bila najboljša pri pH 2. Maksimalna kapaciteta adsorbenta za svinčeve ione je bila dosežena pri koncentraciji 12 mM in je znašala 151,80 mg/g adsorbenta. Adsorpcija Cd2+ ionov je bila najvišja pri pH 5, vendar je bila količina adsorbiranih ionov mnogo nižja kot Pb2+ ionov. Največjo specifično površino je imelo biooglje brez dodatka ocetne kisline, in sicer 12,8229 m2/g. Najnižjo vrednost zeta potenciala -19,00 mV je imel vzorec zdrobljenega biooglja, pridobljenega z dodatkom ocetne kisline. Velikost delcev je bila najvišja pri nezdrobljenih delcih biooglja. V tem primeru je imelo največji povprečni premer biooglje pridobljeno brez dodatka ocetne kisline, in sicer 3248 nm.

Ključne besede

adsorpcija;biooglje;hidrotermična karbonizacija;svinec;zeta potencial;magistrske naloge;

Podatki

Jezik:	Slovenski jezik
Leto izida:	2017
Tipologija:	2.09 - Magistrsko delo
Organizacija:	UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Založnik:	[A. Sever]
UDK:	666.123.4:66.046.562(043.2)
COBISS:	21028118
Št. ogledov:	1077
Št. prenosov:	125
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Adsorption of heavy metals on biochar
Sekundarni povzetek:	The purpose of this thesis was to study the adsorption properties of biochar derived from waste biomass by the hydrothermal carbonization process (HTC) for the adsorption of heavy metals, i.e., Cd2+ and Pb2+ ions. As a waste biomaterial, we used the bark of deciduous trees with a high proportion of tannins, which is a chestnut. We determined the yield of biochar obtained with HTC and measured the zeta potential, the specific surface area, the pore volume, the average pore diameter, and the size of the particles. Biochars were prepared without and with the addition of acetic acid, and the results were compared. The average yield and mass of the two obtained samples were similar. Then we equilibrated the adsorption of Cd2+ and Pb2+ ions depending on the pH and concentration of the starting solution. The equilibrium adsorption of Pb2+ ions in pH dependence was best at pH 2. The maximum lead adsorbent capacity was reached at a concentration of 12 mM and amounted to 151.8 mg/g of adsorbent. Adsorption of Cd2+ ions was highest at pH 5, but the amount of adsorbed ion was much lower than Pb2+ ions. The largest specific surface area had biochar without the addition of acetic acid, which amounted to 12.8229 m2/g. The minimum value of the zeta potential of -19,00 mV was the sample of broken biochar obtained with the addition of acetic acid. The particle size was the highest in non-fragmented biochar particles. In this case, the maximum average diameter of biochar was obtained without acetic acid addition, which amounted to 3248 nm.
Sekundarne ključne besede:	adsorption;biochar;hydrothermal carbonization;lead;zeta potential;BET;
URN:	URN:SI:UM:
Vrsta dela (COBISS):	Magistrsko delo/naloga
Komentar na gradivo:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Strani:	IX, 38 str.
ID:	10864811