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7 results on '"Temel, Farabi."'

6. Removal of p-Nitrophenol from Aqueous Solutions by Calixarene based Graphene Oxide

Author

ÇENGEL, Fatih and TEMEL, Farabi

Subjects
Engineering, Adsorption,Calixarene,Graphene oxide,p-Nitro phenol, Mühendislik, Adsorpsiyon,Kaliksaren,Grafen oksit,p-Nitro fenol
Abstract

Bu çalışmada, kaliks[4]aren temelli grafen oksit (GO-Epoksi-C[4]CN), öncelikle grafit tozundan Hummers metodu kullanarak grafen oksitin (GO) sentezlenmesi ve (3-glisidoksipropil)trimetoksisilan (GPTMS) ile etkileştirilerek epoksi ucundan p-ter-bütilkaliks[4]aren dinitril türevinin bağlanması ile elde edildi. Sentezlenen bileşiklerin karakterizasyonları, 1H NMR ve FTIR analizleri ile gerçekleştirildi. Elde edilen yeni adsorban (GO-Epoksi-C[4]CN), atık sulardan p-nitro fenolün (PNF) giderilmesi için kullanıldı. Öncelikle, adsorban ve başlangıç bileşikleri kullanılarak karşılaştırma çalışmaları gerçekleştirildi ve % 81 adsorpsiyon verimi ile diğerlerine göre oldukça yüksek bir verim sağladığı gözlendi. Çalışmanın devamında, pH ve konsantrasyonun adsorpsiyona etkisi incelendi. Konsantrasyon çalışmalarından elde edilen bulgular ışığında adsorpsiyonun Langmuir izotermiyle daha uyumlu olduğu görüldü., In this study, calix[4]arene-based graphene oxide (GO-Epoxy-C[4]CN) was synthesized using graphene oxide (GO), which was obtained from graphite powder by the Hummers method. After GO preparation, it was reacted by (3-glycidyloxypropyl)trimethoxysilane (GPTMS) to get its epoxy (GO-Epoxy). Then, GO-Epoxy-C[4]CN was obtained by immobilization of p-tert-butylcalix[4]arene nitrile derivative onto the GO-Epoxy. Characterizations of synthesized compounds were performed by 1H NMR and FTIR analysis. The obtained new adsorbent (GO-Epoxy-C[4]CN) was used for the removal of p-nitrophenol (PNP) from wastewater. First of all, comparison studies were carried out using adsorbent and starting compounds, and it was observed that it provided a very high efficiency with 81% adsorption efficiency compared to the others. Then, the effect of pH and concentration on adsorption was investigated. Hence, it was seen that the adsorption was more compatible with the Langmuir isotherm.

Published
2021

7. Effect of Shot‐Peening Process and Nanoparticle‐Added Lubricant on the Tribological Performance of Aluminium‐Based Sliding Bearing Material.

Author

Korkmaz, Seyma, Cetin, M. Huseyin, Simsir, Hamza, Unal, Okan, and Temel, Farabi

Subjects
*FATIGUE limit, *SURFACE roughness, *ALUMINUM bronze, *SILVER nanoparticles, *ROUGH surfaces, *SHOT peening
Abstract

ABSTRACT In this study, it is aimed to increase the wear and fatigue performance of aluminium‐based sliding bearing material by using silver nanoparticles (AgNPs) added lubricant and shot‐peening process. The main purpose is to minimise the wear of the bearing material by penetrating AgNPs added lubricants into the rough surfaces formed by shot peening. Almen intensity, coverage and shot size parameters in the shot‐peening process were analysed in terms of hardness, surface roughness and fatigue strength. The shot‐peened aluminium bronze was subjected to wear experiments under dry, pure water and AgNPs added lubricant conditions. The wear test results were analysed in terms of friction coefficient, wear volume and surface roughness parameters, and the interaction of lubricant and shot‐peening parameters was evaluated. According to the results of the shot‐peening experiments, the Almen intensity was the most effective parameter in terms of hardness and surface roughness (91.62%). It was concluded that the hardness value was 8% higher at high Almen (12–14A) intensity compared with low Almen intensities, and the shot‐peening process could increase the fatigue strength by ~21 times. According to the wear tests, the most effective parameters were 4–6 Almen intensity and AgNP‐added lubricant. [ABSTRACT FROM AUTHOR]

Published
2024
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