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Photochemical activation of air pollutants, related to the preservation of cultural heritage

Fotohemijska aktivacija zagađivača vazduha i veza sa očuvanjem kulturnog nasleđa

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2011
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Authors
Juranić, Ivan
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Abstract
It is well known that the exposition to air and weather markedly enhances derogation of all artifacts. In this report, the contribution of light (particularly sunlight) to marked speed-up of the oxidation and other changes by exposition to atmosphere will be analyzed. Five major mechanisms of the effect of insolation can be identified: 1. First is a trivial one – the heating effect which enhances all chemical processes. 2. Photoexcitation of material from which the item is made, turning it more reactive toward air oxygen (and to other present substances). 3. Sensitization of oxygen by excitation to singlet state in which it is extremely reactive, and can react even with inert materials. 4. Photochemical transformation of volatile organic compounds (VOC), primarily aldehydes and ketones, that can with oxygen yield organic acids and hydroperoxides which definitely harm majority of materials. 5. In contact of oxygen and another material, upon the absorption of light quanta, a ch...arge transfer process can occur, giving yield to pairs of ion-radicals, which further can be transformed in various reactive products.

Dobro je poznato da izloženost vazduhu i vremenskim prilikama dovodi do značajnog narušavanja stanja svih rukotvorina. U ovom radu ćemo anaizirati uticaj svetlosti (naročito sunčeve svetlosti) na značajno ubrzanje oksidacije i drugih promena kao posledica izloženosti atmosferskim prilikama. Može se identifikovati pet glavnih mehanizama efekta insolacije:1. Prvi je trivijalni- uticaj zagrevanja koji ubrzava sve hemijske procese 2. Fotoekscitacija materijala od koga je predmet izrađen, što ga čini reaktivnijim prema kiseoniku iz vazduha( i drugim prisutnim supstancama). 3. Senzibilizacija kiseonika putem ekcitacije u stanje singleta u kojem je on ekstremno reaktivan i može reagovati čak i sa inertnim materijalima.4. Fotohemijska transformacija isparljivih organskih jedinjenja(VOC), prvensveno aldehida i ketona, koja sa kiseonikom mogu dati organske kiseline i hidroperokside koji definitivno oštećuju većinu materijala. 5. U dodiru sa kiseonikom i nekim drugim materijalom, nakon ...apsorpcije kvantuma svetlosti može doći do procesa prenosa naelektrisanja, što dovodi do parova jon-radikala, koji se dalje mogu transformisati u razne reaktivne produkte.

Keywords:
Chemical mechanisms / Air pollutants / Photooxygenation / hemijski mehanizmi / zagađivači vazduha / fotooksigenacija
Source:
Journal of Engineering & Processing Management, 2011, 3, 1, 91-100
Publisher:
  • Sarajevo : University of East Sarajevo, Faculty of Technology
Projects:
  • Rational design and synthesis of biologically active and coordination compounds and functional materials, relevant for (bio)nanotechnology (RS-172035)

ISSN: 2566-3615

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https://jepm.tfzv.ues.rs.ba/index.php/Journal/article/view/97
https://cer.ihtm.bg.ac.rs/handle/123456789/3864
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