Synthesis of Environmentally Friendly Carbon Nano Fibers with Methanol by Using Chemical Vapor Deposition Technique

Yıl 2023, , 394 - 397, 30.09.2023

Melek Cumbul Altay

https://doi.org/10.35229/jaes.1336615

Öz

This study aims to investigate the suitability of methanol as a carbon source for the synthesis of carbon nanofibres (CNFs), currently used in wastewater, water, and air purification systems, by chemical vapor deposition (CVD) in the presence of NiO catalyst. Experimental studies were carried out in a tube furnace under isothermal conditions. Catalyst particles were loaded onto silicon wafers with <100> orientation by dip coating to grow CNFs. The reduction behavior of nickel oxide powder at 1000 K under non-isothermal and isothermal conditions was investigated before CNF synthesis studies. The percentage reduction of nickel oxide powder under non-isothermal conditions was 82.03%. The percentage reduction under isothermal conditions for 30 min was 78.03%. The experimental result obtained is very close to the theoretical value (78.57%). During CNF synthesis experiments, it was observed that CNF formation was not achieved at temperatures of 1000 - 1100 K due to the poor thermal decomposition of methanol. Pyrolysis of methanol increased with increasing synthesis temperature (1200 K), which promoted the synthesis of CNFs. SEM analysis revealed morphologically dense CNF formation under isothermal conditions for 20 min at 1300K synthesis temperature.

Anahtar Kelimeler

Carbon Nano Fiber, Chemical Vapor Deposition, Methanol, NiO catalyst

Çevre Dostu Karbon Nano Fiberlerin Kimyasal Buhar Biriktirme Tekniği Kullanılarak Metanol ile Sentezlenmesi

Öz

Bu çalışma, NiO katalizör varlığında kimyasal buhar biriktirme (KBB) yöntemiyle günümüzde atık su arıtma, su ve hava arıtma sistemlerinde kullanılmaya başlanan karbon nano fiberin (KNF) sentezlenmesi üzerinde karbon kaynağı olarak methanolün uygunluğunun araştırılması amaçlamaktadır. Deneysel çalışmalar tüp fırında izotermal şartlar altında yapılmıştır. Karbon nanofiberlerin büyütülmesi için <100> yönelimli bir silikon levhalar daldırma kaplama yöntemi ile katalizör parçacıkları ile yüklenmiştir. Nikel oksit tozunun 1000 K'de izotermal olmayan ve izotermal koşullar altında indirgenme davranışı CNF sentezi çalışmalarından önce incelenmiştir. Nikel oksit tozunun izotermal olmayan koşullar altında indirgenme yüzdesi %82,03'tür. İzotermal koşullar altında 30 dakika boyunca indirgenme yüzdesi %78,03'tür. Elde edilen deneysel sonuç teorik değere (%78,57) çok yakındır. CNF sentez deneylerinde 1000-1100 K sıcaklıklarında metanolün zayıf termal parçalanma derecesi nedeniyle KNF oluşumu sağlanmadığı gözlemlenmiştir. Sentez sıcaklığının artmasıyla (1200 K) metanolün pirolizi artmış bu durumda KNF’ lerin sentezini teşvik etmiştir. Sentez sıcaklığı 1300 K olduğunda ise morofolojide 20 dakika izo termal şartlar altında yoğun KNF mikroyapısı oluştuğunu yapılan SEM analiz sonuçları ortaya koymuştur.

Anahtar Kelimeler

Karbon Nano Fiber, Kimyasal Buhar Biriktirme, Metanol, NiO Katalizör.

Kaynakça

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