Adsorption studies of azotetrazolate and 3,6-dihydrazinotetrazine on peat.
PBN-AR
Instytucja
Wydział Geologii (Uniwersytet Warszawski)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
ISSN
1093-4529
EISSN
Wydawca
TAYLOR & FRANCIS INC
DOI
URL
Rok publikacji
2013
Numer zeszytu
8
Strony od-do
905-911
Numer tomu
48
Identyfikator DOI
Liczba arkuszy
Autorzy
(liczba autorów: 3)
Pozostali autorzy
+ 1
Słowa kluczowe
en
Adsorption isotherms
high-nitrogen compounds
azotetrazole salt
3
6-dihydrazinotetrazine
peat
thermodynamic parameters.
Streszczenia
Język
en
Treść
The objective of our studies was the evaluation of the adsorption process of two high-nitrogen compounds–dihydrazinotetrazine (DHTz) and azotetrazolate ion (AZ)−on a chosen peat. The experiments were performed using a static method at three different temperatures (283, 298, and 333 K). The adsorption process of DHTz and AZ on peat was characterized by isotherms according to the Freundlich and Langmuir models. The obtained correlations between adsorption and equilibrium concentration were in good accordance with the Freundlich and Langmuir models, as confirmed by high values of the correlation coefficients (0.97−0.99). Adsorption of AZ on peat was less efficient than that of DHTz, and this inference was experimentally proven. The maximum surface coverages of peat particles with adsorbate according to the Langmuir model were calculated as 0.02 and 0.17 mol kg−1 (at 298 K) for AZ and DHTz, respectively. The determined adsorption equilibrium constants confirmed greater adsorption of DHTz on the investigated peat. It can be concluded that adsorption of AZ occurred to a much lesser extent compared to that of DHTz, pointing to a potentially greater threat of migration of soluble azotetrazolates in soil. Standard enthalpies of adsorption estimated for AZ and DHTz were −11.1 and −23.7 kJ mol−1, respectively. Based on these adsorption enthalpy values, it can be stated that both investigated compounds are adsorbed on peat by a physisorption process.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
504133
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