UV-A IŞINLARIYLA TOPRAKLARDAKİ POLİAROMATİK HİDROKARBONLARIN (PAH’LARIN) GİDERİMİNDE TiO2’İN FOTOKATALİZÖR OLARAK KULLANIMI

Öz

Toprak, poliaromatik hidrokarbonlar (PAH’lar) için karasal çevredeki en önemli rezerv alanıdır. Toprağın PAH gibi hidrofobik organik kirleticilere ilgisi büyüktür ve bu kirleticiler için doğal bir alıcı ortam gibi davranır.

Bu çalışmada, PAH bileşikleri ile kirlenmiş topraklardan ultraviole (UV) ışın teknolojisiyle PAH bileşiklerinin giderimi araştırılmıştır. Bu kapsamda UV-A ışınları kullanılmış olup sıcaklığın ve TiO₂ kullanımının PAH’ların giderimine etkileri belirlenmiştir. Toprak örnekleri Bursa’da yer alan ve yoğun PAH kirliliğine maruz kaldığı bilinen bir çimento fabrikası yakınından alınmıştır. UVA uygulamasıyla topraktaki PAH miktarında %89’a varan oranda azalma sağlanmıştır. UVA-TiO₂ uygulamaları sonunda topraktaki PAH kirliliğinin tamamı giderilmiştir. Maksimum ∑₁₂ PAH giderim verimi 18 ^oC’de %10 TiO₂ ilavesiyle (%100 verim) 30 ^oC’de ise %1 TiO₂ ilavesiyle (%95 verim) elde edilmiştir. 30 ^oC’de TiO₂ dozunun %1’in üzerine çıkmasının foto-parçalanma sürecine önemli bir katkısının olmadığı tespit edilmiştir. Giderim uygulamalarında sıcaklığın yükselmesiyle daha fazla PAH ortamdan uzaklaştırılmış olup, buharlaşma ve reaksiyon hızlarındaki olası artışın buna sebep olduğu kanısına varılmıştır.

Anahtar Kelimeler

• Toprak,Ultraviole-A,Sıcaklık,Titanyum dioksit

USING OF TiO2 AS A PHOTOCATALYST DURING POLYCYCLIC AROMATIC HYDROCARBONS (PAHs) REMOVAL FROM SOILS WITH UV-A LIGHT

Abstract

Soil is the most important reserve area for the polyaromatic hydrocarbons (PAHs) in the terrestrial environment. Soil has a great affinity to hydrophobic organic pollutants like PAHs and acts as a natural receiving environment for these pollutants. In this study, the removal of PAHs from soils with ultraviolet (UV) radiation technology was investigated. In this context, UV-A rays were used and the effects of temperature and TiO₂ use on the removal of PAHs were determined. Soil samples were taken from a cement factory (exposed to intense PAH pollution) located in Bursa. The amount of PAH in the soil was reduced by up to 89% by UV-A application. After the application of UVA-TiO2, the contamination of PAH in the soil was completely eliminated. Maximum ∑₁₂ PAH removal was obtained with 10% TiO₂ addition (100% removal) at 18 ^oC and 1% TiO₂ addition (95% removal) at 30 ^oC. It has been determined that at 30 °C, the TiO₂ dose above 1% has no significant contribution to the photo-degradation process. With the increase in temperature, more PAHs have been removed from the environment, and it has been concluded that the possible increase in evaporation and reaction rates caused this.

Keywords

• Soil,Ultraviole-A,Temperature,Titanium dioxide

Kaynakça

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