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All Journal VALENSI Indonesian Journal of Chemistry Jurnal Fisika : Fisika Sains dan Aplikasinya Indigenous Biologi Jurna Beta Kimia Chemistry Notes
Fidelis Nitti
Department of Chemistry, University of Nusa Cendana, Jl. Adi Sucipto, Penfui, Kupang 85001, Nusa Tenggara Timur, Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics

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Improving the Performance of Polymer Inclusion Membranes in Separation Process Using Alternative Base Polymers: A Review Fidelis Nitti; Odi Theofilus Edison Selan; Bosirul Hoque; David Tambaru; Muhammad Cholid Djunaidi
Indonesian Journal of Chemistry Vol 22, No 1 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.68311

Abstract

Polymer inclusion membrane (PIM) has recently evolved as an alternative separation technique to conventional solvent extraction as it eliminates the use of toxic solvents, reduces separation cost, and simplifies the separation process. PIM is the new generation of a liquid membrane made by casting solution containing liquid phases (extractant and plasticizer/modifier) and base polymers. Despite its better performance and stability in comparison to the previous types of liquid membranes, PIM's robustness for applications on an industrial scale is still considered insufficient mainly due to its limited stability in the long-term separation process. In recent years, different approaches have been devoted to improving the stability of PIM while maintaining its performance. This review aims to summarize and evaluate the current literature on the improvement of the performance of PIMs with particular focus on the use of alternative base polymers, including non-conventional linear homopolymers, copolymers, or cross-linking polymers. Furthermore, more emphasis is given to the composition, fabrication process, and application of the PIMs. Finally, the performance of the PIMs with the alternative base polymers in terms of extraction rate and long-term stability is presented and compared to the PIMs fabricated using their corresponding common base polymers.
Structural, Electronic, Elastic, and Optical Properties of Cubic BaLiX3 (X = F, Cl, Br, or I) Perovskites: An Ab-initio DFT Study Redi Kristian Pingak; Soukaina Bouhmaidi; Larbi Setti; Bartholomeus Pasangka; Bernandus Bernandus; Hadi Imam Sutaji; Fidelis Nitti; Meksianis Zadrak Ndii
Indonesian Journal of Chemistry Vol 23, No 3 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.83261

Abstract

This study reports for the first time the theoretical prediction of structural, electronic, elastic and optical properties of cubic BaLiCl3, BaLiBr3, and BaLiI3 perovskites. The corresponding properties of the well-known BaLiF3 are also theoretically investigated. Density Functional Theory (DFT) using the Generalized Gradient Approximation (GGA) was implemented within the Quantum Espresso package to investigate the properties of the perovskites. The results revealed that BaLiX3 (X = F, Cl, Br, and I) are in ionic crystal forms with optimized lattice parameters of 4.04, 4.90, 5.21, and 5.66 Å, respectively. The minor band gaps were found to be 6.62 eV (Γ→Γ), 4.29 eV (R→Γ), 3.50 eV (R→Γ), and 2.58 eV (R→Γ) for the respective compounds. The investigation of their elastic properties indicated that these perovskites are all mechanically stable, while only BaLiBr3 and BaLiI3 are malleable. Finally, the studied perovskites exhibit excellent optical properties, including low reflectivity and high absorption in the ultraviolet region. Hence, it is predicted that these perovskites are suitable for various optoelectronic applications involving absorption in the UV region. However, BaLiBr3 and BaLiI3 are more favorable than BaLiF3 and BaLiCl3 to be deposited as thin films due to their flexibility.
Simple Microfluidic Paper-Based Analytical Device (μ-PAD) Coupled with Smartphone for Mn(II) Detection Using Tannin as a Green Reagent Fidelis Nitti; Wendelina Archangela Ati; Philiphi de Rozari; Pius Dore Ola; David Tambaru; Luther Kadang
Indonesian Journal of Chemistry Vol 23, No 4 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.82511

Abstract

The development of a simple yet greener microfluidic paper-based analytical device (μ-PAD) for on-site detection of Mn(II) in various types of waters using tannin as a natural reagent was described. The μ-PAD consists of twelve detection zones, created on a Whatman Number 1 filter paper by a simple drawing technique using an acrylic watercolor. The detection of Mn(II) was based on the color change on the reaction zone due to the reaction between Mn(II) and the pre-deposited tannin. The μ-PAD image was captured by a portable smartphone detector, and the blue intensity was digitized using a color picker application to generate the reflectance as the analytical response. The proposed method was characterized by a linear dynamic range of 0.05–0.25 mg L−1 with the limit of detection (LOD) for the determination of Mn(II) of 0.026 mg L−1. The other analytical merits of the proposed method, such as precision (RSD, 1.107%), accuracy (E, 6.697%), and recovery (104–112%), were all comparable to the existing spectrophotometric methods. The method’s successful application to natural water samples from manganese mining sites aligns with the reference spectrophotometric method, indicating its good selectivity and accuracy without significant influence of commonly associated interfering ions.
A Theoretical Study on Vibrational Energies of Molecular Hydrogen and Its Isotopes Using a Semi-classical Approximation Redi Kristian Pingak; Albert Zicko Johannes; Fidelis Nitti; Meksianis Zadrak Ndii
Indonesian Journal of Chemistry Vol 21, No 3 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.63294

Abstract

This study aims to apply a semi-classical approach using some analytically solvable potential functions to accurately compute the first ten pure vibrational energies of molecular hydrogen (H2) and its isotopes in their ground electronic states. This study also aims at comparing the accuracy of the potential functions within the framework of the semi-classical approximation. The performance of the approximation was investigated as a function of the molecular mass. In this approximation, the nuclei were assumed to move in a classical potential. The Bohr-Sommerfeld quantization rule was then applied to calculate the vibrational energies of the molecules numerically. The results indicated that the first vibrational transition frequencies (v1ß0) of all hydrogen isotopes were consistent with the experimental ones, with a minimum percentage error of 0.02% for ditritium (T2) molecule using the Modified-Rosen-Morse potential. It was also demonstrated that, in general, the Rosen-Morse and the Modified-Rosen-Morse potential functions were better in terms of calculating the vibrational energies of the molecules than Morse potential. Interestingly, the Morse potential was found to be better than the Manning-Rosen potential. Finally, the semi-classical approximation was found to perform better for heavier isotopes for all potentials applied in this study.
Uji Stabilitas Polymer Inclusion Membrane dari Polimer Pendukung PVC, Ekstraktan D2EHPA, dan Plasticizer Asam Oleat pada Kondisi Asam Rensini, William Antoni; Kadang, Luther; Lapailaka, Titus; Naat, Johnson Nune; Pingak, Redi Kristian; Kapitan, Origenes Boy; Nitti, Fidelis
Jurnal Beta Kimia Vol 4 No 1 (2024): Volume 4, Nomor 1: Mei 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v4i1.15351

Abstract

Polymer Inclusion Membrane (PIM) merupakan membran cair generasi terbaru untuk pemisahan berbagai jenis komponen kimia organik dan anorganik. Stabilitas PIM merupakan faktor yang sangat penting untuk efektivitas pemisahan yang berkelanjutan. Penelitian ini dilakukan untuk menyelidiki kestabilan PIM yang dibuat dari PVC sebagai polimer pendukung, D2EHPA sebagai ekstraktan, dan asam oleat (AO) sebagai plasticizer dalam HCl 2,5 M. Hasil penelitian menunjukkan komposisi PIM optimum adalah 50% PVC, 40% D2EHPA, dan 10% AO yang menunjukkan karakteristik fisik yang ideal seperti tipis, transparan, fleksibel dengan permukaan yang tidak berminyak. Hasil penelitian menunjukkan penurunan berat PIM yang direndam dalam HCl 2,5 M lebih kecil dibandingkan dengan penurunan berat PIM yang direndam dalam air selama 7 hari. Hasil ini menunjukkan bahwa PIM lebih stabil dalam kondisi asam dibandingkan dalam air (netral). Perbandingan karakteristik kimia PIM sebelum dan setelah uji stabilitas menunjukkan PIM yang direndam dalam air mengalami kehilangan fase cair selama proses uji stabilitas. Perbedaan ini terkonfirmasi melalui perbedaan karakteristik fisika PIM sebelum dan sesudah uji stabilitas. Secara keseluruhan, PIM dengan komposisi optimum 50% PVC, 40% D2EHPA, dan 10% AO disarankan untuk digunakan dalam pemisahan pada kondisi asam untuk mempertahankan stabilitas dan efisiensi pemisahannya.
STABILITAS POLYMER INCLUSION MEMBRANE DARI POLIMER PENDUKUNG PVC DAN EKSTRAKTAN D2EHPA DALAM ASAM KLORIDA Modhe, Katarina; Ledoh, Sherlly M. F.; Lapailaka, Titus; Kadang, Luther; Naat, Johnson N.; Pingak, Redi K.; Kapitan, Origenes B.; Nitti, Fidelis
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 9 No 1 (2024): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v9i1.15377

Abstract

Polymer Inclusion Membrane (PIM) merupakan generasi terbaru membran cair yang dirancang khusus untuk pemisahan berbagai jenis komponen kimia organik dan anorganik. Stabilitas PIM menjadi faktor kunci untuk memastikan efektivitasnya dalam proses pemisahan yang berkelanjutan. Penelitian ini bertujuan untuk menginvestigasi kestabilan PIM yang terbuat dari 60% PVC sebagai polimer pendukung dan 40% D2EHPA sebagai ekstraktan dalam larutan uji asam klorida (HCl) 2,5 M. Hasil penelitian PIM dengan komposisi ini menunjukkan karakteristik fisiknya yang ideal seperti tipis, transparan, fleksibel dengan permukaan yang tidak berminyak. Hasil uji stabilitas berturut-turut menunjukkan penurunan berat PIM yang dibiarkan pada udara terbuka, dalam air, dan dalam 2,5 M HCl selama 7 hari sebesar 0,92%; 10,15% dan 4,30%. Trend ini secara umum menunjukkan bahwa PIM dengan komposisi 60% PVC dan 40% D2EHPA memiliki kestabilan yang lebih baik di dalam larutan yang bersifat asam dibandingkan dengan larutan yang bersifat netral. Perbandingan karakteristik spektra FTIR PIM sebelum dan setelah uji stabilitas menunjukkan PIM yang direndam di dalam air mengalami kehilangan sebagian besar ekstraktan D2EHPA selama proses uji stabilitas. Perbedaan karakteristik spektra FTIR PIM sebelum dan setelah uji stabilitas dengan direndam di dalam air ini juga terkonfirmasi melalui perbedaan karakteristik fisika PIM sebelum dan sesudah uji stabilitas yang meliputi water contact angle, water uptake, tensile strength dan % elongation. Secara keseluruhan, hasil penelitian ini mengindikasikan bahwa PIM yang dibuat dengan komposisi PVC 60% dan D2EHPA 40% disarankan untuk digunakan dalam pemisahan pada kondisi asam untuk mempertahankan stabilitas dan efisiensi pemisahannya.
DFT Insights into the Structural, Mechanical, Electronic and Optical Properties of Novel InZnCl3 and InCdCl3 Chloro-Perovskites Pingak, Redi Kristian; Ngara, Zakarias Seba; Johannes, Albert Zicko; Bukit, Minsyahril; Tanesib, Jehunias Leonidas; Nitti, Fidelis; Sianturi, Hery Leo; Pasangka, Bartholomeus
Indonesian Journal of Chemistry Vol 24, No 5 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.94870

Abstract

The ABX3 perovskite materials have recently emerged as one of the most promising materials for optoelectronic applications. In the present study, novel perovskites in the form of InZnCl3 and InCdCl3 are computationally investigated to determine their key characteristics, including structural, mechanical, electronic, and optical characteristics. These characteristics were evaluated using the density functional theory (DFT) implemented in the quantum espresso code. The results indicated that both materials exhibit chemical, dynamic, and mechanical stability. Moreover, these perovskites are predicted to be ductile, rendering them suitable for a broad array of optoelectronic applications, including solar cells. The electronic band structure and the density of states of the materials revealed their characteristics as indirect semiconductors with band gap energy values of 0.96 eV for InZnCl3 and 1.83 eV for InCdCl3 perovskites. The optical properties calculations also unveiled that these perovskites possess strong absorption in the visible-ultraviolet spectrum (up to 106 cm−1) and low reflectivity. The calculated refractive index and extinction coefficient of the compounds were also predicted in this study. These collective findings strongly suggest the potential applications of these novel materials in optoelectronic devices.
Model Isotherm Adsorpsi Triptamin menggunakan Adsorben Silika termodifikasi BSA Deram, Rosalia Febriana; Anarato, Antonius Umbu; Lestarani, Dewi; Neolaka, Yantus A.B.; Lawa, Yosep; Kalla, Eka B.S.; Baunsele, Anselmus B.; Nitti, Fidelis; Naat, Johnson N.
Jurnal Beta Kimia Vol 4 No 2 (2024): Volume 4, Nomor 2: November 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v4i2.19684

Abstract

This article reports the adsorption isotherm model of tryptamine using bovine serum albumin-modified silica adsorbent (SiO₂@BSA) obtained from Takari natural sand as a silica source. Silica was extracted from natural sand and then modified with BSA. The SiO₂@BSA adsorbent was used to adsorb tryptamine in a batch system with 5, 10, 20, 30, 40, and 50 mg/L concentrations. Tryptamine content was analyzed using a UV-Vis spectrophotometer at 423 nm. Eight models were employed to describe the adsorption isotherm of tryptamine. The modeling results revealed that tryptamine adsorption follows the Langmuir isotherm model, with an R² value of 0.938 and a maximum adsorption capacity of 7.961 mg/g. This study confirms the potential of SiO₂@BSA as an effective adsorbent for tryptamine adsorption, contributing to the development of adsorption technology for organic compounds.
Low-Cost Adsorbent Development: Sulfuric Acid-Activated Teak Sawdust for Effective Methylene Blue Removal Baunsele, Anselmus Boy; Missa, Hildegardis; Siswanta, Dwi; Naat, Johnson N.; Neolaka, Yantus A. B.; Nitti, Fidelis; Lema, Abner Tonu; Basuki, Rahmat; Rahayu, Rahayu
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 2, November 2024
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i2.41425

Abstract

The expansion of the global textile industry has resulted in a decline in environmental quality. Environmental pollution resulting from textile dye waste may include heavy metals and dyes, which exhibit carcinogenic and mutagenic effects. Many studies have been done to reduce the harm of dyes. Extensive research has been undertaken to mitigate the detrimental effects of dyes. One cost-effective approach for managing dye pollution is the adsorption of methylene blue using sulfuric acid-activated teak sawdust. Teak wood sawdust, a byproduct of the furniture industry that is abundant and underutilized, contains active sites within its constituent compounds, including cellulose, hemicellulose, and lignin. This study was designed to determine the ability of teak sawdust to adsorb methylene blue. In this investigation, the biosorbent will be characterized using fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and scanning electron microscopy-energy dispersive X-ray (SEM-EDX) to analyze its active sites and surface morphology. Additionally, the study aimed to elucidate the impact of variation contact time, pH solution, and alteration in methylene blue concentration on the adsorption capacity for methylene blue, employing a UV-Vis spectrophotometer for measurement. The research results demonstrated that optimal adsorption occurred at a contact time of 30 minutes and a pH of 6, with the adsorption efficiency reaching 99.67% as a function of contact time. The kinetic study was modeled using a pseudo-second-order approach, with a kinetic constant of 79.71 g mg⁻¹ min⁻¹. The maximum adsorption capacity was 1.351 mg g⁻¹, the n value was 1, and the percentage of methylene blue adsorbed reached 99.88%.
Activated Carbon Adsorbents Derived from Agricultural Waste for Phenolic Pollutant Removal: A Review Zulaicha, Annisaa Siti; Kiswandono, Agung Abadi; Buhani, Buhani; Suharso, Suharso; Nitti, Fidelis; Rinawati, Rinawati
Indonesian Journal of Chemistry Vol 25, No 3 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.102884

Abstract

The widespread discharge of phenol into the environment has posed a threat to the environment. Phenol waste in the aquatic environment is mainly due to its involvement in various industries such as the petrochemical, pharmaceutical, and wood product sectors. Recent studies have shown that industrial waste contains phenol in the concentration range of 2.8 to 6800 mg/L. The presence of phenol in water can cause bioaccumulation in aquatic organisms, thus posing a risk to the food chain and human health through the consumption of phenol-contaminated seafood. Long-term exposure of humans to phenol-contaminated water causes health problems such as anorexia, progressive weight loss, and liver disorders. This emphasizes the importance of addressing and reducing phenol contamination to safeguard human health. Various treatment methods have been applied, including filtration, reverse osmosis, and adsorption. Among these, adsorption is widely used due to its simplicity and cost-effectiveness, with activated carbon as the most commonly used adsorbent. This study comprehensively reviews previous studies on agricultural waste-based activated carbon (palm shell, candlenut, and rubber) for phenolic compound removal. It examines characterization data (BET, XRD, SEM-EDX, and FTIR) and adsorption performance, aiming to provide recommendations of the most promising biomass for developing efficient activated carbon.
Co-Authors ., Suwari Abner Tonu Lema Agung Abadi Kiswandono Ajung, Oktaviani Anarato, Antonius Umbu Anselmus Boy Baunsele Bartholomeus Pasangka Baunsele, Anselmus B. Bernandus Bernandus Bosirul Hoque Buhani Buhani Bukit, Minsyahril David Tambaru Deram, Rosalia Febriana Dina Tiara Kusumawardhani Dwi Siswanta Hery L. Sianturi Hildegardis Missa Ina, Rosinta Tamu Johannes, Albert Zicko Kalla, Eka B.S. Kapitan, Origenes Boy Kedang, Yoana Fransiska De Chantal Kedjo, Gervasia Y Lakabela, Merliana Lapailaka, Titus Larbi Setti Lawa, Yosep Ledoh, Sherly M.F Lestarani, Dewi Lulan, Theo Y.K. Lulan, Theodore Y. K. Lulan, Theodore Y.K. Luther Kadang Meksianis Zadrak Ndii Modhe, Katarina Muhammad Cholid Djunaidi Naat, Johnson N. Ndii, Meksianis Z Ndolu, Intan C. M. Neolaka, Yantus A B Odi Theofilus Edison Selan Ola, Pius D. Pasangka, Bartholomeus Philiphi de Rozari Pingak, Redi Kristian Pius Dore Ola Rahayu Rahayu Rahmat Basuki Rensini, William Antoni Rinawati Rinawati Sambur, Ma'aki M. D. Santos, Adelina Dos Sherlly Ledoh Soi, Maria Yuliana Soukaina Bouhmaidi Suharso Suharso Sutaji, Hadi Imam Suwari, Suwari N. Tanesib, Jehunias Leonidas Wendelina Archangela Ati Zakarias Seba Ngara Zulaicha, Annisaa Siti