Browsing by Author "Taufik, A."

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Different Routes of Synthesized CdO Nanoparticles Through Microwave-Assisted Methods and Photocatalytic Study
(2018-01-01)
Taufik, A.
;
Tju, H.
;
Prakoso, S. P.
;
Saleh, R.
;
應用化學系
In this study, CdO (Cadmium Oxide) nanoparticles with different derivation techniques were prepared using the microwave-assisted method. The reactants used were Cadmium Acetyl Acetonante Cd(acac), NaOH (Sodium Hydroxide), and Na2CO3 (Sodium Carbonate). The prepared samples were characterized using X-ray diffractions, UV-Vis diffuse reflectance spectroscopy, thermogravimetric analysis and differential thermal analysis, photoluminescence (PL), and Fourier transform infrared spectroscopy. All CdO nanoparticles have cubic structures with different optical characteristics. The band gap energy of CdO derived from direct calcination Cd(acac) was around 1.5 eV; the energy of CdO derived from Na2CO3 was around 3.8 eV; and the CdO synthesized using NaOH had a band gap around 2.1 eV. The strong emission at 395 nm (violet) from PL measurement corresponded to the band-edge emission of CdO. This photocatalytic activity result indicated that the CdO nanoparticles derived from calcination Cd(acac) to CdO nanoparticles exhibited high photocatalytic activity with a percentage degradation of approximately 77 %.
Novel Ag2O/ZrO2 Composites with Enhanced Photocatalytic Water Decontamination
(2018-01-01)
Taufik, A.
;
Kristianto, Y.
;
Prakoso, S. P.
;
Saleh, R.
;
應用化學系
In this study Silver Oxide/Zirconium Dioxide (Ag2O/ZrO2) with different Ag2O:ZrO2 weight ratio were synthesized using microwave assisted method for remove organic pollutant from the aqueous solution through photocatalytic performance. The structural properties of the samples characterized by X-ray diffraction confirm the existence of cubic structures from silver (Ag) nanoparticles, cubic structure silver oxide (Ag2O), and tetragonal structures from Zirconia (ZrO2). The higher ZrO2 loading resulted in the higher Ag nanoparticles on the samples. The thermal analysis was investigated using Differential Thermal Analysis and Thermogravimetric Analysis (DTA/TGA). The weight lost at 400 degrees C could be attributed to the phase transformation from Ag2O into Silver nanoparticles followed by accepted heat from the environment. The UV vis absorbance spectra confirm the existence of surface plasmon resonance from silver nanoparticles. The photocatalytic activity was tested on the degradation of methylene blue from the aqueous solution. As can be seen from the figure that the higher ZrO2 loading resulted in the higher photocatalytic activity under visible light irradiation with percentage degradation approximately 83 % The enhancement of photocatalytic performance due to the retarding recombination electron and holes.