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Home Κινητική διερεύνηση ετερογενούς αλληλεπίδρασης αερίου HCl με επιφάνειες ερημικής σκόνης και πιθανές επιπτώσεις της στη διαλυτότητα των μετάλλων

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Identifier

000407906

Title

Κινητική διερεύνηση ετερογενούς αλληλεπίδρασης αερίου HCl με επιφάνειες ερημικής σκόνης και πιθανές επιπτώσεις της στη διαλυτότητα των μετάλλων

Alternative Title

Kinetic investigation of gaseous HCl heterogeneous interaction with surfaces of desert dust and potential impact on metals solubility

Author

Φουτούλη, Ζωή Π.

Thesis advisor

Μιχαλόπουλος, Νικόλαος

Reviewer

Κανακίδου, Μαρία
Περγαντής, Σταύρος

Abstract

In the present MSc dissertation, the heterogeneous interaction of gaseous HCl with Saudi Arabia dust surfaces, was studied. The title interaction might plays a key-role in the atmosphere, as well as in multiple environmental processes, due to that gaseous HCl adsorption on particles might be both an important sink that determines its atmospheric abundance and an indirect factor, via particles precipitation, that enhances eutrophication. Experiments carried out using a continuous flow system equipped with a Knudsen reactor ensuring very low pressure conditions (Very Low Pressure Reactor, VLPR) and a quadrupole mass spectrometer, QMS, used to analyse the modulated effusive molecular beam that exits the reactor. Experiments performed in temperature range 253 – 296 Κ, simulating Marine Boundary Layer (MBL) and the lower atmosphere’s temperatures. Under those conditions, gaseous HCl affinity with dust surface was studied via initial uptake coefficient (γ₀) determination, as well as HCl adsorption probability on the surface available sites via measuring the number of molecules that are attached on the surface, N_s (surface coverage, θ = Ν_s/N_max) and the related isotherms. Both γ₀ and N_s are of great importance, since they provide with information about the adsorption mechanism and can be used to investigate the impact on dust constituents’ solubility in the ocean. Therefore, they are critically related with one of the most severe threads for the oceanic environment and the sea waters that is eutrophication.

Language

Greek

Subject

Adsorption of Gaseous HCl

Initial Uptake Coefficient, γ0

Knudsen Reactor

Saudi Arabia Dust

Αντιδραστήρας Knudsen

Προσρόφηση Αερίου HCl

Σκόνη Σαουδικής Αραβίας

Συντελεστής Αρχικής Κατακράτησης, γ0

Issue date