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Biosourced Reduced Graphene Oxide and Its Application for Methylene Blue Adsorption Rachmat, Addy; Ahadito, Bijak Riyandi; Suryani, Sri; Meiliza, Cici; Hidayati, Nurlisa; Julinar, Julinar; Said, Muhammad
The Journal of Pure and Applied Chemistry Research Vol. 14 No. 3 (2025): Edition September-December 2025
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2025.014.03.7926

Abstract

Graphene oxide and reduced graphene oxide have been widely studied as a biomass-sourced alternative to graphene for their various capabilities, e.g. as adsorbent. This publication reports the preparation of graphite (g), graphene oxide (GO), and reduced graphene oxide (rGO) from coconut shell (1) and sugarcane bagasse (2) using matoa leaves extract as reducing agent, characterized by XRD, FT-IR, and Raman spectroscopy. The X-ray diffractogram showed 2θ peaks between 22.8°–23.8° for g1, GO1, and rGO1, and between 23.6°–25.8° for g2, GO2, and rGO2. FT-IR spectra of both sets of GO and rGO showed common peaks of O–H (~3400 cm–1), C–H (~2900 cm–1), and C–OH (~1600 cm–1), while also some noticeable differences between the sets. Raman spectra of both rGO showed D peak (~1400 cm–1), G peak (~1700 cm–1), and weak 2D peaks (2700–3300 cm–1) with ID/IG of 0.93 and 0.91 for rGO1 and rGO2, respectively. The obtained g, GO, and rGO were used as adsorbent for methylene blue dye. The adsorption study involved variation in dye concentration, contact time, and amount of adsorbent. It was found that rGO performs best as adsorbent compared to GO and g, with maximum adsorption capacity of 22.308 μg/mg (rGO1) and 47.533 μg/mg (rGO2). Adsorbents prepared from sugarcane bagasse were found to perform better due to its easiness of carbonization compared to coconut shell.
Biosynthesis, Characterization of Curcumin-Capped Zno-Cuo and Chitosan-Curcumin-Capped Zno-Cuo based Nanomaterial as Antibacterial Agent of Escherichia coli Fatoni, Ahmad; Umli, Afnita Fatmawati; Sriwijaya, Reza Agung; Hilma, Hilma; Hidayati, Nurlisa
Chimica et Natura Acta Vol 13, No 3 (2025)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v13.n3.62946

Abstract

The biofabrication of the chitosan-curcumin-capped ZnO-CuO and curcumin-capped ZnO-CuO nanoparticles, as well as their ability to combat Escherichia coli bacteria, were the focus of this study. Fourier-Transform Infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM) were used to examine the chitosan-curcumin-capped ZnO-CuO and curcumin-capped ZnO-CuO nanoparticles, respectively. Both were evaluated using the agar diffusion method as antibacterials against Escherichia coli. Results of analysis with FTIR, between 500 and 700 cm⁻¹, the functional group of Cu-O or Zn-O was seen at its highest point. The functional group of Cu-O and Zn-O in curcumin-capped ZnO-CuO was detected at wavenumber of 621 cm⁻¹ and 507 cm⁻¹, respectively. In chitosan-curcumin-capped ZnO-CuO, the wave numbers of the Cu-O and Zn-O groups were observed at 619 and 653 cm-1 respectively.  According to XRD analysis results, the chitosan-curcumin-capped ZnO-CuO and curcumin-capped ZnO-CuO nanoparticles' crystalline shapes are demonstrated by their respective crystallite sizes of 12.58 and 1.88 nm. Based on the results of analysis with SEM, curcumin-capped ZnO-CuO and chitosan-curcumin-capped ZnO-CuO nanoparticles have a dense surface structure. The average diameter of inhibition zone (clear zone) produced by chit-cur-ZnO-CuO nanoparticles is 14.61 mm, while the clear zone produced by cur-ZnO-CuO nanoparticles is 9.52 mm. Chit-cur-ZnO-CuO has superior antibacterial qualities to cur-ZnO-CuO nanoparticles.