Carbon-titanium oxide nanocomposite (denoted as @C-Ti02) was successfully synthesized via hydrothermal method at 150°C for 24 h. The C-Ti02 nanocomposite was furtherly modified by adding an Ag metal dopant (denoted as Ag@C-Ti02) to improve and applied to the photocatalytic degradation of Sasirangan textile wastewater. The composite photocatalysts were characterized by XRD and UV-Vis DRS spectroscopies. XRD patterns showed that Ti02 in @C-Ti02 mainly consisted of a brookite phase, as indicated by a series sharp diffraction peak at 2 = 27.20 (111), 31 -5°( 121) and 55.90 ( 241 ). The calculated band gap energy (£ g ) derived from UV-Vis DRS spectra for Ti02, @C-Ti02, and Ag@C-Ti02 were 2.95 eV, 2.54 eV, and 2.74 eV, respectively. Ag@C-Ti02 photocatalyst was found to be active for the photocatalytic degradation of Sasirangan textile wastewater, as indicated by the change of wastewater color from dark to clear. The quantitative photocatalytic activity of Ag@C-Ti02 was evaluated in the degradation of methylene blue, whereas the conversion of methylene blue was 41.3 %. The addition of Ag to @C-Ti02 is believed to play an essential role in the enhancement of photocatalytic activity.
In this research, the synthesis of nanocellulose from Nypa fruticans fronds as a filler of polyvinyl alcohol-based bioplastic has been carried out. Nanocellulose synthesis was carried out using sulfuric acid hydrolysis process with a concentration of 30% and the results were analyzed using a Particle Size Analyzer. The effect of addition of the amount of nanocellulose on bioplastics from polyvinyl alcohol such as moisture content, thickness, transparency, vapor transmission rate, solubility and functional group analysis using FTIR have been evaluated. The results showed that the nanocellulose from Nypa fruticans fronds had a diameter below 600 nm. The addition of nanocellulose with a concentration of 0.2%; 0.4% and 0.6% into the polyvinyl alcohol bioplastic can increase the thickness and transparency of the bioplastic, and reduce the water vapor transmission rate. However, the addition of nanocellulose in this range did not significantly affect the water content and the solubility of bioplastics in water.
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