Fabrication, characterization and response surface method optimization for quantum efficiency of fluorescent nitrogen-doped carbon dots from carboxymethylcellulose derived from empty fruit bunch of oil palms

Publication date: Available online 23 April 2019Source: Chinese Journal of Chemical EngineeringAuthor(s): Mohammed Abdullah, Zurina Z. Abidin, Shafreeza Sobri, Suraya Rashid, Mohd Adzir Mahdi, Nor Azowa Ibrahim, Musa YahayaAbstractBio based nitrogen doped carbon dots (N-CDs) were obtained from empty fruit bunch carboxymethylcellulose and ethylenediamine (EDA) through one-pot hydrothermal carbonization route. The optimum as-formed N-CDs were thoroughly characterized via Transmission electron microscopy (TEM), high-resolution TEM (HRTEM), Fourier transform infrared (FTIR), X-ray photoelectron spectra (XPS), UV–vis spectra (UV–Vis) and Fluorescence spectra (PL). Response surface methodology was statistically used to assess three independent variables that have major influence on the fluorescence quantum yield (QY), including temperature (230–270 °C), time (2–6 h) and EDA weight (10–23.3%). Based on analysis of variance (ANOVA) results, synthesis temperature was found to be the most influential factor on the QY, followed by time and EDA weight. Higher temperature, long synthesis time and high amount of EDA were satisfactorily enough for efficient carbonization conversion rate and obtaining highest QY of N-CDs. The obtained quadratic model (R2 = 0.9991) shows a good correlation between the experimental data and predicted values. The optimum synthetic parameters are of 270 °C temperature, 6 h reaction time and 23.3% of EDA weight. The optimized as-made N-CDs...
Source: Chinese Journal of Chemical Engineering - Category: Chemistry Source Type: research