2-Hydroxypyridine photolytic degradation by 254 nm UV irradiation at different conditions.

Abstract:

:The degradation and mineralisation of (400 mL, 3.15 mM) aqueous solutions of 2-hydroxypyridine (2-HPY), a primary intermediate formed during the photolytic degradation of 2-chloropyridine (2-CPY), 2-bromopyridine (2-BPY) and 2-iodopyridine (2-IPY), was studied at 50 degrees C, under 254 nm UV irradiation in a range of conditions. The rate of 2-HPY disappearance was found to heavily depend on agitation, dissolved oxygen, pH and hydroxyl radical scavenger presence. pH has a pronounced effect on the phototreatment of 2-HPY, i.e. 2-HPY removal is faster at lower pH, but except for their influence on the solution pH, Cl(-) or F(-) do not appear to affect 2-HPY rate of removal or mineralisation. 2-HPY removal rate increases with dissolved oxygen, thus indicating a prominent 2-HPY photooxidation pathway. Helium purging of the solution before and during the measurement reduced 2-HPY removal rate, thus supporting the existence of a photooxidation pathway. Pure photolytic 2-HPY removal, i.e. when photooxidation is limited, fits pseudo-first order kinetics, and a kinetic model was developed for 2-HPY formation and removal during 2-CPY, 2-BPY and 2-IPY photolytic degradation under laminar flow. The addition of radical scavenger (tert-butanol) had a detrimental effect on the photolytic degradation of 2-HPY. Complete total organic carbon removal was achieved.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Stapleton DR,Konstantinou IK,Karakitsou A,Hela DG,Papadaki M

doi

10.1016/j.chemosphere.2009.08.026

subject

Has Abstract

pub_date

2009-11-01 00:00:00

pages

1099-105

issue

8

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(09)00980-1

journal_volume

77

pub_type

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