https://www.journalajopacs.com/index.php/AJOPACS <p style="text-align: justify;"><strong>Asian Journal of Physical and Chemical Sciences (ISSN: 2456-7779)</strong> aims to publish high quality papers (<a href="https://journalajopacs.com/index.php/AJOPACS/general-guideline-for-authors">Click here for Types of paper</a>) in all areas of Physics, Chemistry and Earth Sciences. By not excluding papers based on novelty, this journal facilitates the research and wishes to publish papers as long as they are technically correct and scientifically motivated. The journal also encourages the submission of useful reports of negative results. This is a quality controlled, OPEN peer-reviewed, open-access INTERNATIONAL journal.</p> SCIENCEDOMAIN international en-US Asian Journal of Physical and Chemical Sciences 2456-7779 https://www.journalajopacs.com/index.php/AJOPACS/article/view/346 <p>This study compared hydrodistillation and steam distillation for the extraction of essential oil from <em>Commiphora myrrha</em> resin and evaluated differences in yield, chemical composition, antioxidant activity, and antimicrobial activity. Steam distillation produced a higher essential-oil yield (3.25%) than hydrodistillation (1.25%). Hydrodistillation produced a pale-yellow oil with a density of 0.8766 g/cm³, whereas steam distillation produced a golden-yellow oil with a density of 0.8791 g/cm³. GC-MS analysis identified 69 components in the steam-distilled oil and 76 components in the hydrodistilled oil. The principal constituents of the steam-distilled oil were alpha-pinene (24.54%), terpinen-4-ol (13.21%), beta-ocimene (11.80%), caryophyllene (4.50%), and humulene (4.11%). The hydrodistilled oil was characterised mainly by alpha-pinene (28.54%), 3-carene (16.24%), terpinen-4-ol (9.07%), sabinene (5.55%), and o-cymene (5.42%). In the DPPH assay, steam-distilled oil showed significantly greater radical-scavenging activity than hydrodistilled oil at all tested concentrations (p &lt; 0.05). Total antioxidant capacity was also higher for steam-distilled oil (0.32 ± 0.019 mg ASAeq/mg dw) than for hydrodistilled oil (0.249 ± 0.003 mg ASAeq/mg dw). Antimicrobial responses varied according to microorganism and concentration; hydrodistilled oil produced larger inhibition zones in several bacterial comparisons and against <em>Candida albicans</em> at 25%, whereas some comparisons showed no significant difference. The findings demonstrate that the extraction method influenced oil yield, volatile composition, and the measured biological activities under the tested conditions.</p> Abdullahi Yusuf Mohamed Mahmoud M. Ali Copyright (c) 2026 Author(s). The licensee is the journal publisher. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0 2026-09-19 2026-09-19 14 4 1 15 10.9734/ajopacs/2026/v14i4346 https://www.journalajopacs.com/index.php/AJOPACS/article/view/348 <p>Methylene blue (MB) is a cationic dye whose removal from contaminated aqueous media is important for wastewater treatment. This study evaluated graphene/iron oxide (EG/Fe₃O₄) and graphene/iron oxide/bismuth oxybromide (EG/Fe₂O₃/BiOBr) composites for MB adsorption. The binary composite was prepared by electrochemical exfoliation; BiOBr was synthesised hydrothermally, and the ternary composite was subsequently assembled through hydrothermal treatment. The materials were characterised by scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, and thermogravimetric analysis. XRD indicated Fe₃O₄ as the dominant iron oxide phase in EG/Fe₃O₄ and the presence of Fe₂O₃ and BiOBr in the ternary composite. Batch adsorption experiments examined contact time, initial MB concentration, and adsorbent dose. Equilibrium was reached after approximately 60 min in the contact-time experiments. The pseudo-second-order model provided the better kinetic fit for both composites. Equilibrium data were best described by the Langmuir model for EG/Fe₃O₄ and by the Freundlich model for EG/Fe₂O₃/BiOBr. The maximum adsorption capacities were 21.41 mg g⁻¹ and 27.10 mg g⁻¹, respectively. Maximum removal efficiencies of 99.8% for EG/Fe₃O₄ and 99.6% for EG/Fe₂O₃/BiOBr were obtained in the adsorbent-dose experiments. These findings indicate that both composites are effective MB adsorbents under the tested batch conditions, with differences in removal efficiency and adsorption capacity.</p> Bintou Coulibaly Koffi Pierre Dit Adama N’goran Benjamin Diby Ossonon Lemeyonouin Aliou Guillaume Pohan N’guessan Louis Berenger Kouassi Mambe Nathan Donald Bogui Marie Pascale A. Kouakou Coulibaly Korotoum Donourou Diabate Copyright (c) 2026 Author(s). The licensee is the journal publisher. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0 2026-09-22 2026-09-22 14 4 16 30 10.9734/ajopacs/2026/v14i4348