https://aca.unram.ac.id/index.php/ACA/issue/feed Acta Chimica Asiana 2023-07-29T00:00:00+08:00 Lalu Rudyat Telly Savalas telly@unram.ac.id Open Journal Systems <p><strong>Acta Chimica Asiana </strong>(online <a href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1489059749&amp;1&amp;&amp;">ISSN 2550-0503</a>, print <a href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1489064854&amp;1&amp;&amp;">ISSN 2550-049x</a>) is a peer-reviewed, open access journal that publishes high-quality original research articles as well as review articles in all areas of Chemistry and Chemical Engineering. Significant finding that is insufficient to be presented as comprehensive paper but needs to reach the reader immediately may also be submitted as a short communication. The editors welcome original contributions that have not been published and are not under consideration elsewhere. This journal is published by Chemistry Education Program, the University of Mataram. All papers published free of charge. Upon request, language assistance may also be provided to ensure valuable works in chemistry meet their readers.</p> <p>Acta Chimica Asiana has been Accredited by the Ministry of Research, Technology and Higher Education of The Republic of Indonesia. The recognition published in Director Decree No.85/M/KPT/2020.</p> https://aca.unram.ac.id/index.php/ACA/article/view/159 Thermodynamics and kinetic studies of methyl orange dye adsorption in magnetic material-silica-zeolite (MM-Sio2-NZ) composite 2023-04-27T13:07:10+08:00 Alrum Armid Armid@gamil.com Fahmiati Fahmiati fahmiati@uho.ac.id Halimahtussaddiyah Ritonga Ritonga@gmail.com Darwin Ismail Ismail@gmail.com La Ode Ahmad Nur Ramadhan Ramadhan@gmail.com <p>Using methyl orange (MO) in dye industries can cause the accumulation of MO waste in aquatic systems, including seawater. A magnetic material-silica-zeolite (MM-SiO2-NZ) composite was investigated in vitro to adsorb methyl orange (MO) dye. MM-SiO2-NZ composite was characterized using FTIR, XRF, and VSM. Adsorption studies with pH, concentration, contact time, and temperature variations were carried out to determine the adsorption capacity. The MM-SiO2-NZ characterization results by FTIR showed the presence of OH groups from Fe-OH, Si-OH, and Al-OH, and there were Fe-O, Si-O, Al-O, Si-O-Si, and Si-O-Fe groups. The results of XRF characterization showed that the metal oxide content of Fe2O3 in magnetic material (MM) was 75.39% and decreased to 52.63% after the MM-SiO2-NZ composite was formed. The characterization using VSM indicated the magnetic properties of MM to be 44.083 emu/g, then decreased to 11.407 emu/g after being composited. The adsorption of MM-SiO2-NZ tends to follow the Langmuir adsorption isotherm with a Langmuir constant (KL) value of 1.332 L/mg. Furthermore, the adsorption kinetics followed the pseudo-second-order kinetics with a constant value (k2) of 3×10-2 g.mg/min. MO dye adsorption by MM-SiO2-NZ took place spontaneously with Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) values of -1.109 kJ/mol, -38.687 kJ/mol, and -12.402 kJ/mol, respectively.</p> 2022-05-10T00:00:00+08:00 Copyright (c) 2023 Alrum Armid, Fahmiati Fahmiati, Halimahtussaddiyah Ritonga, Darwin Ismail, La Ode Ahmad Nur Ramadhan https://aca.unram.ac.id/index.php/ACA/article/view/144 Design of heat exchanger for producing nickel ferrite (NiFe2O4) nanoparticles using coprecipitation method 2023-01-13T14:21:31+08:00 Sifa Aulia Rahma auliarahmanurfal@upi.edu Asep Bayu Dani Nandiyanto nandiyanto@upi.edu Teguh Kurniawan teguh@untirta.ac.id <p>This study examines the design of a heat exchanger (HE) in the production process of nickel ferrite (NiFe<sub>2</sub>O<sub>4</sub>) nanoparticles using the coprecipitation method by determining the shell and tube heat exchanger. The Microsoft Excel application is used as a manual calculating machine to facilitate the analysis of heat exchanger (HE) data calculations. The research flowchart starts with a literature study, preparation of tools and materials for design, calculation of the main shell and tube components, and then fabrication. Based on the calculation results, the design specification data for a shell and tube heat exchanger has a shell diameter of 0.032 m, a shell length of 4.267 mm, a thickness of 0.002 m with an initial heat transfer rate (Q) of 460130 W resulting in a heat transfer efficiency of 95.706% and an NTU of 6.165. The high effectiveness value makes the design of the one shell and tube type turbulent flow heat exchanger (HE) considered to have met the standards of high effectiveness and good performance. The design and design process is complete if the device functions properly. This study can be used as a reference for researchers in designing heat exchangers during production to make them more effective, reliable, and economical.</p> 2023-05-16T00:00:00+08:00 Copyright (c) 2023 Sifa Aulia Rahma Sifa Aulia Rahma, Asep Bayu Dani Nandiyanto, Teguh Kurniawan https://aca.unram.ac.id/index.php/ACA/article/view/160 Highly photocatalytic performance of TiO2 nanowires in the conversion of benzaldehydes to benzoic acid 2023-05-24T16:21:58+08:00 Sudirman Sudirman sudirman28@unram.ac.id Lalu Dimas Pratama Atmaja laludimasp@gmail.com Ari Jamhari Pratama emailb083@gmail.com Emmy Yuanita emmy_yuanita@unram.ac.id Ni Komang Tri Dharmayani tri.dharmayani@unram.ac.id Maria Ulfa ulfaarief@unram.ac.id Romel Hidayat rhidayat@sejong.ac.kr <p>The synthesis of environmentally friendly-based chemicals such as solvent-free continues to be developed. A critical precursor in chemical synthesis is benzoic acid. This research developed a synthesis method by utilizing TiO<sub>2</sub> nanomaterials with different morphologies as photocatalysts, namely nanoparticles (NPs) and nanowires (NWs). Titanium (IV) oxide with nanowires morphology was synthesized by hydrothermal method under alkaline conditions. SEM, XRD, and FT-IR images confirmed the morphologies of TiO<sub>2</sub> NPs and TiO<sub>2</sub> NWs. Photocatalytic performance in converting benzaldehyde to benzoic acid showed a significant difference of up to 38% using TiO<sub>2</sub> NPs and 94% using TiO<sub>2</sub> NWs.</p> 2023-06-04T00:00:00+08:00 Copyright (c) 2023 Sudirman Sudirman, Lalu Dimas Pratama Atmaja, Ari Jamhari Pratama, Emmy Yuanita, Ni Komang Tri Dharmayani, Maria Ulfa, Romel Hidayat https://aca.unram.ac.id/index.php/ACA/article/view/165 Evaluation of gold (au) particle distribution in Grasberg mine material of Freeport Indonesia: fire assay approach 2023-06-16T10:28:50+08:00 Akram La Kilo akram@ung.ac.id Ishak Isa isi@ung.ac.id Muhammad Taufiq Nur mtaufiknur7@gmail.com <p>Freeport Indonesia is one of Freeport-McMoRan Copper &amp; Gold Inc. affiliate companies. Freeport Indonesia conducted a series of mining and exploration processes for ore containing gold, silver, and copper. Grasberg is the mining location in PT Freeport, Indonesia. This research aimed to determine the distribution of gold (Au) particles in Grasberg rock samples with relatively high gold content. The method used for analyzing the gold content was Fire Assay. The research results indicated that the sample size affected the gold distribution in Grasberg Mine samples. An uneven distribution tendency of gold was observed in the distribution comparison of Splitter and Screen variations with normal Au content.</p> 2023-06-18T00:00:00+08:00 Copyright (c) 2023 Akram La Kilo, Ishak Isa, Muhammad Taufiq Nur https://aca.unram.ac.id/index.php/ACA/article/view/166 Increasing corrosion resistance of binary Al-Alloy through implanting with some transition elements and heteroatom organic compounds 2023-06-04T16:19:43+08:00 Fatemeh Mollaamin smollaamin@gmail.com <p>Decorating of Transition metals (TMs) on the "AlMg" nanoalloy has been&nbsp; studied on the basis of &nbsp;Langmuir adsorption applying "ONIOM" model with three levels of «high, medium and low» by using "LANL2DZ /6-31+G(d,p)/EPR-III", "semi-empirical" and "MM2" functions. The fluctuation of "NQR" has estimated the inhibiting role of pyridine and alkylpyridines containing 2-picoline (2Pic), 3-picoline (3Pic) ,4-picoline (4Pic), and 2,4-lutidine (24Lut) &nbsp;for (Sc, Ti, Cr, Ni, Cu, Zn)-doped AlMg alloy nanosheet due to "N" atom in the benzene cycle of heterocyclic carbenes being near the monolayer surface of ternary "TM–(Al–Mg)" (TM= Sc, Ti, Cr, Ni, Cu, Zn) nanoalloys. The "NMR" spectroscopy has remarked In fact, the NMR results of the adsorption of pyridine and alkylpyridines of 2Pic, 3Pic, 4Pic and 24Lut molecules represent spin polarization on the TM (Sc, Ti, Cr, Ni, Cu, Zn)-doped Al–Mg nanoalloy surfaces that these surfaces can be employed as the magnetic N-heterocyclic carbene sensors. In fact, "TM" sites in "TM–(Al–Mg)" nanoalloy surfaces have bigger interaction energy amount from "Van der Waals’ forces" with pyridine and its nitrogen heterocyclic family that might cause them large stable towards coating data on the nanosurface. It has been estimated that the criterion for choosing the surface linkage of "N" atom in pyridine and alkylpyridines in adsorption sites can be impacted by the existence of close atoms of aluminum and magnesium in the "TM–(AlMg)" surfaces. Moreover, "IR" spectroscopy has exhibited that (Sc, Ti, Cr, Ni, Cu, Zn)-doped AlMg alloy nanosheet with the fluctuation in the frequency of intra-atomic interaction leads us to the most considerable influence in the vicinage elements generated due to inter-atomic interaction. Comparison to &nbsp;amounts versus dipole moment has illustrated a proper accord among measured parameters based on the rightness of the chosen isotherm for the adsorption steps of &nbsp;the formation&nbsp; of Py@Sc–(Al–Mg), Py@Ti–(Al–Mg), Py@Cr–(Al–Mg),&nbsp; Py@Ni–(Al–Mg),&nbsp; Py@Cu–(Al–Mg), and Py@Zn–(Al–Mg) complexes. Thus, the interval between nitrogen atom in pyridine during interaction with transition metals of "Sc, Ti, Cr, Ni, Cu, Zn" in "TM–(Al–Mg)" nanoalloys, (N→TM), has been estimated with relation coefficient of R² = 0.9284. Thus, the present has exhibit the influence of "TMs" doped on the "Al–Mg" surface for adsorption of N-heterocyclic carbenes of pyridine and alkylpyridines by using theoretical methods.</p> 2023-06-23T00:00:00+08:00 Copyright (c) 2023 Fatemeh Mollaamin https://aca.unram.ac.id/index.php/ACA/article/view/161 Docking studies for screening antibacterial compounds of Red Jeringau (Acorus calamus L.) using Shigella flexneri protein as a model system 2023-05-15T17:20:39+08:00 Riyadh Aqilsya Amaryl Dyas agilhiprohi@gmail.com Bambang Wijianto bam.wijianto@gmail.com Hariyanto IH hariyanto.ishak@gmail.com <p>Alpha (a) and beta (β) asarone were identified as the main compounds of red Jeringau (Acorus calamus L.) and had antimicrobial properties. This study aimed to know these two compounds' antibacterial mechanism and toxicity prediction against the PBP 2 protein and 50S Ribosomal Protein of Shigella flexneri. Molecular docking protocol using PyRx device was performed with Exhaustiveness value= 106, grid x=38.738375, y=112.645792, z=46.926417 for PBP2, and grid x=71.721251, y=47.551601, z=9.663173 for 50S Ribosomal Protein. The molecular docking results on the α -Asarone compound obtained an affinity value of -5.7 kcal/mol for PBP2 and an affinity value of -5.6 kcal/mol for 50S Ribosomal Protein. In comparison, β-Asarone had an affinity value of -5.6 kcal/mol to PBP2 and an affinity value of -5.7 kcal/mol for 50S Ribosomal Protein. The α and β-Asarone affinity had better values than the control. Molecular docking of α and β-Asarone compounds results in ionic bonds to the TYR529 amino acid and polar bonds to the ASN552 amino acid of PBP2. However, only β-Asarone produces ionic bonds at the amino acid ILE17 and polar bonds at GLU13 from 50S Ribosomal Protein. Based on this study, the α and β-Asarone compounds were shown to have antibacterial activity by interfering with the permeability of the bacterial cell wall. Both compounds are also predicted to have carcinogenic and mutagen effects.</p> 2023-06-24T00:00:00+08:00 Copyright (c) 2023 Riyadh Aqilsya Amaryl Dyas, Bambang Wijianto, Hariyanto IH https://aca.unram.ac.id/index.php/ACA/article/view/164 Synthesis and characterization of activated carbon from biomass waste reject pulp as an adsorbent for wastewater treatment 2023-06-03T10:40:56+08:00 Sri Hilma Siregar srihilma@umri.ac.id Hasmalina Nasution hasmalinanst@umri.ac.id Wirdati Irma wirdati.irma@umri.ac.id Dedi Suwito Suwito@gmail.com Aulia Rizki Rahmadani auliarizkiramadhanti212@gmail.com Sha-Ling Han shiln@cyut.edu.tw <p>This study examines the design of a heat exchanger (HE) in the production process of nickel ferrite (NiFe<sub>2</sub>O<sub>4</sub>) nanoparticles using the coprecipitation method by determining the shell and tube heat exchanger. The Microsoft Excel application is used as a manual calculating machine to facilitate the analysis of heat exchanger (HE) data calculations. The research flowchart starts with a literature study, preparation of tools and materials for design, calculation of the main shell and tube components, and then fabrication. Based on the calculation results, the design specification data for a shell and tube heat exchanger has a shell diameter of 0.032 m, a shell length of 4.267 mm, a thickness of 0.002 m with an initial heat transfer rate (Q) of 460130 W resulting in a heat transfer efficiency of 95.706% and an NTU of 6.165. The high effectiveness value makes the design of the one shell and tube type turbulent flow heat exchanger (HE) considered to have met the standards of high effectiveness and good performance. The design and design process is complete if the device functions properly. This study can be used as a reference for researchers in designing heat exchangers during production to make them more effective, reliable, and economical.</p> 2023-07-28T00:00:00+08:00 Copyright (c) 2023 Sri Hilma Siregar, Hasmalina Nasution, Wirdati Irma, Dedi Suwito, Aulia Rizki Rahmadani, Sha-Ling Han