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

Year 2018, , 522 - 531, 20.07.2018

Gizem Eker

https://doi.org/10.28948/ngumuh.443178

Abstract

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.

Keywords

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

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