Banana peels as agro-waste residues contain potassium oxide as the main component after calcination. The calcined waste banana peels (WBPs) successfully transesterified palm oil to biodiesel at room temperature using a homogenizer.

Electrospun nanofibers are unique one-dimensional materials with high surface area to volume ratio which can be used in various applications including in antibacterial application. In this study, we demonstrated a simple fabrication of polyethylene oxide-polypyrrole (PEO-PPy) composite nanofibers with antibacterial properties. The polymerization of pyrrole was conducted using ammonium persulfate (APS) initiator at ambient temperature for 24 h. The resulting PEO-PPy nanofibers were then characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), fourier transform infrared (FTIR), and tensile tests. The morphology of nanofibers observed by SEM revealed that the minimum concentration of PEO was 8 wt % to obtain the bead-free nanofibers. Meanwhile, variation of pyrrole concentration does not alter the morphology of nanofibers significantly. The crystallinity of the nanofibers increased with increasing the PEO amount indicated by two typical peaks located at 2θ = 19°and 23°, respectively. On the other hand, polypyrrole contributed the antibacterial properties significantly to the nanofibers and as a result, the antibacterial activity determined by UV-Vis spectrophotometer increased dramatically with increasing pyrrole concentration from 0.1 to 0.2, 0.3, 0.4, and 0.5 mM. The electrospun nanofiber mats exhibited good antibacterial properties on E. coli and biocompatibility properties on L929 fibroblasts cell.

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In this paper, we reported about the facile method to generate N-Graphene Nano Sheets (N-GNS) on room temperature. The purposes of this research are to synthesize and characterize N-GNS. This research used the modified Hummers's method to generate GNS and doping nitrogen to N-GNS used ammonia 10 M at T = 30 o C. The N-GNS was characterized by using XRD, FTIR and SEM-EDX. The XRD data show that N atoms was well be deposited on GNS to form N-GNS, it was indicated by the broad and weak peak was appear at 2θ = 26.3 o . This data is consistent with SEM-EDX, where the N atoms content on N-GNS is 2.72 %. FTIR data also defenitely confirm that there is interaction between C and N, indicating by the peak is appear at 1396 cm -1 . All of data show that the N is exist on GNS, it probes N-GNS may synthesized by facile method on room temperature.