Çevre dostu atıksu arıtımı yöntemleri ile mikrokirletici giderimi kinetiğinin incelenmesi: LaFeO3 perovskit tipi katalizör varlığında metilen mavisinin Fenton benzeri oksidasyonu

Yıl 2017, Cilt: 32 Sayı: 4, 1181 - 1192, 08.12.2017

Burcu Palas Gülin Ersöz , Süheyda Atalay

https://doi.org/10.17341/gazimmfd.369536

Cited By: 3

Öz

Tıp,
eczacılık, kimya ve tekstil gibi çeşitli sektörlerde geniş kullanım alanı
bulunan metilen mavisi endüstriyel atıksularda sıklıkla rastlanan kirleticiler
arasındadır. Bu çalışmada LaFeO₃ perovskit tipi katalizörün farklı
reaksiyon koşulları altında hedef mikrokirletici olarak seçilen metilen
mavisinin Fenton benzeri oksidasyonunda sergilediği katalitik performans
araştırılmıştır. Parametrik çalışmada başlangıç metilen mavisi derişimi 1
ppm’de sabit tutulmuştur. 0,05 g/L katalizör yüklemesi, 0,1 mM başlangıç H₂O₂
derişimi, pH=3,5 ve 45°C tepkime sıcaklığı olarak belirlenen optimum koşullar
altında %74,5 organik madde giderimi ve %94,6 renk giderimi sağlanmıştır.
Optimum koşullarda gerçekleştirilen demir liçi analizlerine göre arıtılan sudaki
demir derişimi 0,63 ppm olmuştur. Saf suda ve arıtılan metilen mavisi
çözeltisinde büyüyen Lepidium sativum kök
uzunluklarının karşılaştırılmasıyla hesaplanan toksisite, kök büyümesindeki
inhibisyon cinsinden %1,2 olarak hesaplanmıştır. Kinetik çalışmada renk
giderimi için bir mekanizma önerilmiş ve tepkime hız denkliği türetilmiştir.
Yalancı birinci birinci mertebeden tepkime kinetiğini takip eden renk
gideriminde aktivasyon enerjisi ve ön-üstel faktör sırasıyla 130,8 kJ/mol ve
1,2×10²⁰ dk^-1 olarak bulunmuştur.

Anahtar Kelimeler

Mikrokirleticiler, metilen mavisi, fenton benzeri oksidasyonu, lafeo3 perovskit katalizör, kinetik çalışma, toksisite testi

Kaynakça

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