International Journal of Agricultural and Natural Sciences

Yazarlar: Önder AKSU

Konular:

Anahtar Kelimeler:Iron Oxide,Nanoparticles,UV-Vis Absorbance Values,Statistical Experimental Design

Özet: Ultraviolet-visible (UV-Vis) spectroscopy is generally used in the characterization of metal and metal-based nanomaterials as they possess sensitive optic properties that vary with size, volume, aggregating state. UV-visible absorption spectra of α-Fe2O3 (20-40 nm), γ-Fe2O3 (20-40 nm), were determined between 300 and 800 nm using UV-visible spectrophotometer (Optima, SP-3000 Nano). It is concluded that among selected parameters for α-Fe2O3 (20-40 nm), particle dose and period have an impact decreasing absorbance value. When absolute values of coefficients are examined, effect order is period and dose. According to the results of statistical table provided for γ-Fe2O3 (20-40 nm) NP, correlation coefficient (R2 ) value for appropriate Quadratic model is respectively determined as multiple R=89.78%, R2 =80,61% and adjusted R2 =66.76%. Determination of (R2 ) as 80.61% shows that compatibility between observed values and foreseen values is high and applied model takes place in confidence range. As a result of the evaluation, it is concluded that among selected parameters for γFe2O3 (20-40 nm), particle concentration and period have an impact decreasing absorbance value. Considering all statistical data, it is concluded that maximum effect is observed in a period between 24-30 hours and 25 ppm absorbance concentration is more efficient. In all NPs, absorbance value decreases in periods below 24 hours and above 36 hours. Again likewise, the effect decreases in cases where absorbance dose is low or very high. Considering all data, it is concluded that the effect varies according to type and size of NP and this variance is meaningful.

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