Düşük Maliyetli ve Çevre Dostu Adsorbentler ile Sulardan Arsenik Giderimi

Öz

Doğal ve antropojenik kaynaklar yoluyla alıcı ortamlarda yaygın halde bulunan arsenik, toksik ve kanserojen özelliklerinden dolayı halk sağlığı açısından son yıllarda yer altı ve yer üstü sularında karşılaşılan en önemli sorunlardan biridir. Bu çalışmada, doğal ve atık materyallerden elde edilen düşük maliyetli ve çevre dostu adsorbentler kullanılarak arseniğin adsorptif giderimi araştırılmıştır. Bu amaçla doğal malzeme olarak pomza, atık malzeme olarak kırmızı çamur ve çelikhane cürufu seçilmiştir. Temas süresinin ve adsorbent dozunun etkisi kesikli deneyler yapılarak araştırılmıştır. Test edilen adsorbetler ile %50-95 arasında arsenik giderimleri sağlanmıştır. Deneysel dataların modifiye Freundlich izoterm modeline uyduğu belirlenmiştir. Deneysel çalışmalar, çelikhane cürufunun arsenik gideriminde en etkili adsorbent olduğunu ve 3.058 mgAs g-1 maksimum adsorpsiyon kapasitesine sahip olduğunu göstermiştir. Çelikhane cürufunun yüksek arsenik adsorpsiyon kapasitesi, içerisinde yüksek oranlarda bulunan demir oksit ve kalsiyum oksite bağlanabilir. Mevcut çalışma sonuçları, çelikhane cürufunun arsenik gideriminde ticari aktif karbonlara iyi bir alternatif adsorbent olabileceğini göstermektedir. Bununla birlikte bu atık materyallerin tekrar kullanılması ile atık bertaraf probleminin önüne geçilecek ve ucuz ve etkili bir şekilde çevresel olarak çift taraflı fayda sağlanmış olacaktır.

Anahtar Kelimeler

• Adsorpsiyon
• arsenik
• pomza
• kırmızı çamur
• çelikhane cürufu

Removal of Arsenic From Water With Low Cost and Environmentally-benign Adsorbents

Öz

Arsenic, which is widespread in receiving environments through natural and anthropogenic sources, is one of the most important problems encountered in ground and surface waters in terms of public health in recent years due to its toxic and carcinogenic properties. In this study, the adsorptive removal of arsenic was investigated by using low cost and environmentally-benign adsorbents obtained from natural and waste materials. For this purpose, pumice was chosen as natural material, red mud and steel slag were chosen as waste material. The influence of contact time and adsorbent dosage was investigated using batch tests. 50-95% arsenic removal was achieved with tested adsorbents. Modified Freundlich isotherm was found to provide the best fits to experimental data. Experimental studies have shown that steel slag is the most effective adsorbent in arsenic removal and has a maximum adsorption capacity of 3.058 mgAs g-1. The high arsenic adsorption capacity of the steel slag can be attributed to the high content of iron and calcium oxide. The present study results show that steel slag can be good alternative to commercial activated carbons for the adsorptive removal of arsenic. Moreover, the reuse of this waste material will also provide a double-side environmental benefit in an inexpensive and effective way.

Anahtar Kelimeler

• Adsorption
• arsenic
• pumice
• red mud
• steel slag

Kaynakça

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