https://periodicos.ufms.br/index.php/orbital/issue/feedOrbital: The Electronic Journal of Chemistry2024-01-06T15:08:33+00:00Adilson Beatrizeditor.orbital@ufms.brOpen Journal Systems<div class="addthis_toolbox addthis_default_style "> </div> <table style="border-collapse: collapse;" border="0" width="0%" cellspacing="3" cellpadding="3"> <tbody> <tr valign="top"> <td width="98"> <p style="text-align: justify;"><span style="background-position: 0% 0%; font-weight: bold; font-style: italic; font-family: Franklin Gothic Book;"><img src="http://sintmol.ufms.br/files/2019/12/MinilogoVermelho.png" alt=""></span></p> </td> <td style="text-align: justify;" align="justify" valign="top" width="924"> <p><strong>Orbital: The Electronic Journal of Chemistry</strong> (eISSN 1984-6428) - is a peer-reviewed online journal published by the Institute of Chemistry of the Universidade Federal de Mato Grosso do Sul, Brazil. Original contributions (in English) are welcome, which focus on all areas of Chemistry and their interfaces with Pharmacy, Biology, and Physics. The journal has an international editorial team of experts, ensuring high standards for the texts published. 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Its abbreviated title (CAS Source Index) is <em>Orbital: Electron. J. Chem</em>., which should be used in bibliographical references.</p> <p>Please, like our <a href="https://www.facebook.com/Orbital-The-Electronic-Journal-of-Chemistry-918258038195367/">facebook page</a>. Follow us on <a href="https://twitter.com/Orbital_EJC" target="????????D_blank">Twitter</a> and <a href="https://www.instagram.com/orbitalejc/" target="_blank" rel="noopener">Instagram</a></p> <p><a href="https://periodicos.ufms.br/index.php/orbital/metrics"><strong>JOURNAL METRICS</strong></a></p> </td> </tr> </tbody> </table>https://periodicos.ufms.br/index.php/orbital/article/view/19352Optimization of the Removal of Hexavalent Chromium Cr(VI) from Aqueous Solution by Moringa oleifera Bark-Derived Activated Carbon (MOBAC) Using Response Surface Methodology (RSM)2024-01-06T15:08:33+00:00Evon Acutacut.evonp@gmail.comNova Fe Anoriconovafe.anorico@ustp.edu.phDharel Acutsirdharel.acut@gmail.com<p>This study investigated the removal of hexavalent chromium Cr(VI) ions in an aqueous solution using <em>Moringa oleifera</em> bark-derived activated carbon (MOBAC). The adsorption removal of Cr(VI) was systematically investigated as a function of four experimental factors: pH (1-5), contact time (10-90 min), adsorbent dosage (0.020-0.100 g L<sup>-1</sup>), and temperature (25-45°C) by following a statistical experimental design. A response surface methodology (RSM)-based central composite experimental design was used to establish an empirical model that assessed factors' effects on Cr(VI) ions adsorptive removal. The model was verified and validated and used to predict optimal adsorption removal of Cr(VI) from aqueous solutions. At optimized conditions, 99.612 % of 1.5 mg L<sup>-1</sup> Cr(VI) ions are removed from the aqueous solution. These optimum condition values include a pH of 2.1, contact time of 62.72 min, adsorbent dosage of 0.065 g L<sup>-1</sup>, and temperature of 39.8°C. The adsorptive mechanism was assessed by conducting isotherm and kinetic studies. The adsorption process of Cr(VI) ions by MOBAC is described by Langmuir isotherm, indicating monolayer adsorption, and the reaction kinetics is described by pseudo-second order kinetics model. The Langmuir monolayer adsorption capacity of Cr(VI) adsorption on MOBAC was found to be 4.577 mg g<sup>-1</sup> for Cr(VI) ions. The findings support the use of MOBAC in the removal of Cr(VI) ions from aqueous systems.</p>2023-12-29T16:33:06+00:00Copyright (c) 2023 Orbital: The Electronic Journal of Chemistryhttps://periodicos.ufms.br/index.php/orbital/article/view/19558The Theoretical Description for Cenobamate CuS-Assisted Electrochemical Determination in Pharmaceutical Formulations and Wastewater2024-01-06T15:08:31+00:00Volodymyr Tkachnightwatcher2401@gmail.comTetiana Morozovatetiana.morozova@ukr.netViktoriia Khrutbaviktoria_khrutba@gmail.comAndrii Hlukhonetshon2744@ukr.netMarta Kushnirmarta.v.kushnir@gmail.comYana Ivanushkoyana_iv@ukr.netViktor Kryvetskyivo12005vk@ukr.netInna Kryvetskaverb5831lyud@i.uaIgor Kryvetskyibehe11662mot@ro.ruPetro Yagodynetsved1988mid@rambler.ruMykhailo Kucherkuchermykh@gmail.comZholt Kormoshzholt-1971@ukr.netNadiia Chikunnadiia.chikun255@ukr.netMaria João Monteiromjmonteiro@utad.pt<p>For the first time, the theoretical description for cenobamate antiepileptic drug on anode, assisted by copper sulfide nanoparticles in alkaline medium, has been given. Two mechanisms, involving either tetrazolic ring, or the carbocyclic aromatic moiety, are possible for this process, reason why the concentration of the drug will be identified and quantified by two peaks. Despite of the mechanism hybrid nature, both of the peaks will produce an easy interpretable analytical signal, being thereby possible to confirm the efficiency of the electroanalytical signal.</p>2024-01-03T15:39:43+00:00Copyright (c) 2024 Orbital: The Electronic Journal of Chemistryhttps://periodicos.ufms.br/index.php/orbital/article/view/17709Five-Tier Instrument to Identify Students' Misconceptions and Representation: A Systematic Literature Review2024-01-06T15:08:31+00:00Deni Ainur Rokhimdeniainurrokhim@gmail.comHayuni Retno Widartihayuni.retno.fmipa@um.ac.idSutrisno Sutrisnosutrisno.fmipa@um.ac.id<p>Initial knowledge and conception are one of the factors that have a major influence on learning activities. This is the basis for building students' knowledge of a material concept. However, not all students have the same ability, there are students who have low ability to build concepts. As a result, students who have low ability to build concepts may experience misconceptions that have an impact on their learning outcomes. Therefore, it is necessary to have an appropriate test instrument to identify misconceptions and multiple representation profiles especially in chemistry learning materials, one of which is the topic of reaction rate. This article aims to provide an overview of the application of the five-tier diagnostic instrument in identifying misconceptions and profiles of students' misconceptions about reaction rates. The method used is the SLR (Systematic Literature Review) from literature studies from 2011 to 2021 which are available in the ERIC, SINTA, and Google Scholar databases. The findings of the research results show that the five-tier test instrument can identify students' misconceptions about learning material. Information obtained from the use of the instrument can be used to determine the development of students' ability to understand chemistry using representations.</p>2024-01-03T00:00:00+00:00Copyright (c) 2024 Orbital: The Electronic Journal of Chemistryhttps://periodicos.ufms.br/index.php/orbital/article/view/18323STEM and STEAM Affects Computational Thinking Skill: A Systematic Literature Review2024-01-06T15:08:30+00:00Suci Sukmawati Syafe'isucisukma.syf@gmail.comHayuni Retno Widarti hayuni.retno.fmipa@um.ac.idI Wayan Dasnaidasna@um.ac.idHabiddinhabiddin_wuni@um.ac.idParlanparlan.fmipa@um.ac.idSurjani Wonorahardjosurjani.wonorahardjo@um.ac.id<p><span style="vertical-align: inherit;"><span style="vertical-align: inherit;">STEM (Science, Technology, Engineering, and Mathematics) dan STEAM (Science, Technology, Engineering, Arts, and Mathematics) melawan CT (Computational Thinking) berperan penting dalam pembelajaran sains. </span><span style="vertical-align: inherit;">Penelitian ini bertujuan untuk melihat penelitian terbarukan terkait pengaruh STEM dan STEAM terhadap kemampuan CT. </span><span style="vertical-align: inherit;">Kajian dilakukan berdasarkan 3 tahapan metode Systematic Literature Review (SLR): identifikasi, prosedur penyaringan (pre-processing, abstract screening, dan text filtering), dan pemetaan data. </span><span style="vertical-align: inherit;">Hasil kajian literatur diperoleh dari 12 artikel dengan distribusi terbanyak pada tahun 2020 (n=5), terindeks Scopus Q1 (n=9), menerapkan metode penelitian mixed methods (n=6), dan diterapkan pada jenjang pendidikan dasar (n =6). </span><span style="vertical-align: inherit;">Kemudian, </span><span style="vertical-align: inherit;">instrumen yang paling banyak digunakan adalah tes Computational thinking (n=6) pada dimensi-dimensi penting penilaian CT berupa problem solving, abstraction, algorithmic thinking, critical thinking, creative dan cooperative; </span><span style="vertical-align: inherit;">terintegrasi dalam kegiatan berbasis proyek dengan model desain game (n=2), menghasilkan proyek terbanyak dalam bentuk robot (n=4), dan keseluruhan kegiatan pembelajaran STEM dan STEAM berdampak positif pada CT. </span><span style="vertical-align: inherit;">Berdasarkan temuan tersebut, dapat disimpulkan bahwa kegiatan STEAM mampu memberikan efek yang lebih besar dibandingkan STEM karena adanya “Art”. </span><span style="vertical-align: inherit;">dan keseluruhan kegiatan pembelajaran STEM dan STEAM berdampak positif pada CT. </span><span style="vertical-align: inherit;">Berdasarkan temuan tersebut, dapat disimpulkan bahwa kegiatan STEAM mampu memberikan efek yang lebih besar dibandingkan STEM karena adanya “Art”. </span><span style="vertical-align: inherit;">dan keseluruhan kegiatan pembelajaran STEM dan STEAM berdampak positif pada CT. </span><span style="vertical-align: inherit;">Berdasarkan temuan tersebut, dapat disimpulkan bahwa kegiatan STEAM mampu memberikan efek yang lebih besar dibandingkan STEM karena adanya “Art”.</span></span></p>2024-01-05T23:49:55+00:00Copyright (c) 2024 Orbital: The Electronic Journal of Chemistryhttps://periodicos.ufms.br/index.php/orbital/article/view/18631Unexpected Dimerizations of Arylfurfural Oximes in their Mass Spectra2024-01-06T15:08:28+00:00Samina Aslamdrsamina.chem@wum.edu.pkAroog Fatimadrsamina.chem@wum.edu.pkSidra Mustafadrsamina.chem@wum.edu.pkAnsa Madeeha Zafardrsamina.chem@wum.edu.pkNoreen Aslamdrsamina.chem@wum.edu.pkMussarat Jabeendrsamina.chem@wum.edu.pkMunawar Ali Munawardrsamina.chem@wum.edu.pkMisbahul Ain Khandrsamina.chem@wum.edu.pk<p>Various oximes of arylfurfural were found to eliminate an OH radical and dimerize during their mass spectral fragmentaion. A tentative fragmentation pattern is presented.</p>2024-01-06T14:26:32+00:00Copyright (c) 2024 Orbital: The Electronic Journal of Chemistry