Fatih GÜMÜŞ, Dilek GÜMÜŞ

Çinko ve bakır gideriminde bir biyokütle kaynağı olarak defne yapraklarının kullanılması ve modellenmesi

Türkiye’de kereste dışı orman ürünlerinden olan tıbbi ve aromatik bitkiler sosyo-ekonomik açıdan bu yüzyılda önem kazanmaya başlamıştır. Bu çalışmada aromatic bir bitki olan defne yaprakları arıtma prosesesinde biyosorban olarak kullanılmıştır. Biyosorban dozajı, çözelti pH'sı, temas süresi, başlangıçtaki ağır metal iyonları konsantrasyonu, iyonik kuvvet, hümik asit etkisi ve LNL ile Bakır (II) ve çinko (II) 'nun biyosorpsiyonu üzerindeki rekabetçi etkiler incelenmiştir. Biyosorban, FT-IR ve SEM görüntüleri kullanılarak karakterize edilmiştir. Doğrusallaştırılmış ve doğrusallaştırılmamış izoterm modelleri karşılaştırılmış ve tartışılmıştır. Zn (II) ve Cu (II) biyosorpsiyonu, Temkin denklemiyle daha iyi uyum sağlamış ve sahte ikinci derece reaksiyon kinetiği, her iki ağır metalin biyosorpsiyon davranışlarıyla da uyum göstermistir. Ayrıca, ağır metal biyosorpsiyonu için doğrusal olmayan en uygun izoterm denklemine dayanan tek kademeli bir biyoreaktör sistemi de sunulmuştur. Ağır metal giderimini ortamdaki diğer iyonların varlığı bir miktar etkilemiştir. Bu çalışmalar LNL'nin çinko ve bakır iyonlarını kirli sulardan uzaklaştırmak için, çevre dostu ve bol bulunan bir biyosorban olarak, değerlendirilebileceğini göstermiştir.

Modeling and utilization of laurel leaves as a biomass source for the removal of zinc and copper

Medicinal and aromatic plants which is one of the considerable non-timber forest products in Turkey,especially in the last century have become an important socio-economic values. In this study, Laurusnobilis L. leaves (LNL), an aromatic plant, were used as biosorbent in the treatment process. Theeffects of biosorbent dosage, biosorption time, solution pH, initial zinc and copper ions concentration,humic acid or ionic strength or competitive effects on the biosorption of Zn(II) and Cu(II) by LNL wereinvestigated. The LNL biomass was characterized using SEM and FT-IR spectrum. The non-linearizedand linearized isotherm equations were compared and discussed. Zn(II) and Cu(II) biosorption bettermatched with the Temkin equation and Pseudo second-order kinetic equation successfully definedthe biomass behaviors of both heavy metal ions. Additionally, a single-stage batch bioreactor systemfor heavy metal biosorption based on the best fit non-linear isotherm equation also has beenpresented. It was found that heavy metal uptake was affected by competitive biosorption studies.Finally, these studies showed that the LNL can be used as an environmentally friendly and abundantbiosorbent for removing zinc and copper ions from contaminated waters.

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