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Effect of Toxic Metal Ions on Photosensitized Singlet Oxygen Generation for Photodegradation of Polyaromatic Hydrocarbon Derivatives and Inactivation of Escherichia coli
Author(s) -
Herschmann Jacob R.,
Ali Aqeeb,
Harris Michele,
McClinton Matthew,
Zamadar Matibur
Publication year - 2018
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.13050
Subject(s) - photodegradation , chemistry , singlet oxygen , photochemistry , metal ions in aqueous solution , metal , photosensitizer , inorganic chemistry , nuclear chemistry , oxygen , photocatalysis , catalysis , organic chemistry
Here, we report an experimental study of the effect of toxic metal ions on photosensitized singlet oxygen generation for photodegradation of PAH derivatives, Anthracene‐9,10‐dipropionic acid disodium salt ( ADPA ) and 1,5‐dihydroxynapthalene ( DHN ) and photoinactivation of Escherichia coli bacteria by using cationic meso ‐tetra( N ‐methyl‐4‐pyridyl)porphine tetrachloride ( TMP yP) as a singlet oxygen photosensitizer. Three s‐block metals ions, such as Na + , K + and Ca 2+ and five toxic metals such as Cd 2+ , Cu 2+ , Hg 2+ , Zn 2+ and Pb 2+ were studied. The s‐block metal ions showed no change in the rate of photodegradation of ADPA or DHN by TMP yP, whereas a dramatic change in the photodegradation of ADPA and DHN was observed in the presence of toxic metals. The maximum photodegradation rate constants of ADPA and DHN were observed for Cd 2+ ions [(3.91 ± 0.20) × 10 −3 s −1 and (7.18 ± 0.35) × 10 −4 s −1 , respectively]. Strikingly, the photodegradation of ADPA and DHN was almost completely inhibited in the presence of Hg 2+ ions and Cu 2+ ions. A complete inhibition of growth of E. coli was observed upon visible light irradiation of E. coli solutions with TMP yP and toxic metal ions particularly, Cd 2+ , Hg 2+ , Zn 2+ and Pb 2+ ions, except for Cu 2+ ions where a significantly slow inhibition of E. coli 's growth was observed.