Browsing by Author "Koc, S."

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A Model Test Towards University Students’ Cheating Behaviour in the Context of the Theory of Planned Behaviour
(Birlesik Dunya Yenilik Arastirma ve Yayıncilik Merkezi, 2020) Koc, S.; Memduhoglu, H.B.
This study aimed to identify the causal relationships amongst attitude, subjective norms, perceived behavioural control, moral obligation and intention towards cheating by the Theory of Planned Behaviour. The study sample (n = 1,220) consists of senior students at the faculties of Van Yuzuncu Yil University, Turkey. The data were collected with the scales; attitude, subjective norms, perceived behavioural control, moral obligation and intention towards cheating, which were developed by researchers of the study. The data were analysed by the exploratory factor analysis, confirmatory factor analysis and path analysis. It can be concluded that the Theory of Planned Behaviour is capable of explaining the attitude, subjective norms, perceived behavioural control, moral obligation and intention variables towards cheating, and it is confirmed in a good model fit with this study. According to the path analysis results, the attitude towards cheating has a strong and significant effect for cheating intention, and subjective norms and the perceived behavioural control towards cheating have no significant effect for cheating intention. © 2020 Birlesik Dunya Yenilik Arastirma ve Yayincilik Merkezi. All rights reserved.
Optimization of Methyl Orange Decolorization by Bismuth(0)-Doped Hydroxyapatite/Reduced Graphene Oxide Composite Using Rsm-Ccd
(Springer, 2024) Ecer, U.; Yilmaz, S.; Ulas, B.; Koc, S.
In the current study, the catalyst for the decolorization of methyl orange (MO) was developed HAp-rGO by the aqueous precipitation approach. Then, bismuth(0) nanoparticles (Bi NPs), which expect to show high activity, were reduced on the surface of the support material (HAp-rGO). The obtained catalyst was characterized by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. The parameters that remarkably affect the decolorization process (such as time, initial dye concentration, NaBH4 amount, and catalyst amount) have been examined by response surface methodology (RSM), an optimization method that has acquired increasing significance in recent years. In the decolorization of MO, the optimum conditions were identified as 2.91 min, Co: 18.85 mg/L, NaBH4 amount: 18.35 mM, and Bi/HAp-rGO dosage: 2.12 mg/mL with MO decolorization efficiency of 99.60%. The decolorization process of MO with Bi/HAp-rGO was examined in detail kinetically and thermodynamically. Additionally, the possible decolorization mechanism was clarified. The present work provides a new insight into the use of the optimization process for both the effective usage of Bi/HAp-rGO and the catalytic reduction of dyes. © The Author(s) 2024.