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All Journal JURNAL KIMIA SAINS DAN APLIKASI ALCHEMY Jurnal Penelitian Kimia Sangia : Jurnal Penelitian Arkeologi (Journal of Archaeology Research) Jurnal Penelitian Pendidikan Fisika Advance Sustainable Science, Engineering and Technology (ASSET) Prosiding Seminar Nasional Pengabdian kepada Masyarakat (SINAPMAS) Advance Sustainable Science, Engineering and Technology (ASSET) International Journal of Acta Material
La Ode Ahmad
Department Of Chemistry, Universitas Halu Oleo, Kampus Hijau Bumi Tridharma, Anduonohu , Kendari 93232, Indonesia.
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Social Sciences

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Pengaruh Status Sosial Ekonomi Orang Tua Dan Motivasi Belajar Terhadap Prestasi Belajar Kimia Siswa SMA Negeri Di Kabupaten Konawe Mukhlis, Rasniaty; Dahlan, Dahlan; Ahmad, La Ode
Jurnal Penelitian Pendidikan Fisika Vol 5, No 1 (2020): Jurnal Penelitian Pendidikan Fisika
Publisher : Jurusan Pendidikan Fisika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36709/jipfi.v5i1.9947

Abstract

This research aims to examine and analyze: (1) the influence of parents' socio-economic status on chemistry learning achievement, (2) the effect of learning motivation on chemistry learning achievement, (3) differences in motivation for learning coastal students with students in Watershed, (4) differences in learning achievement of coastal students with students in Watersheds. The location of this research is the SMAN in Konawe District. This type of research is associative research and data collection tools use questionnaires and student learning outcomes report cards. The population is 385 students. Sampling was done by proportional random sampling technique, with a sample of 193 people. Data analysis techniques used descriptive analysis and multiple regression. The results showed: (1) parents' socio-economic status towards chemistry learning achievement by 18%; (2) learning motivation towards chemistry learning achievement by 29%; (3) there are differences in motivation to learn coastal students with students in Watersheds, (4) there are differences in learning achievement of coastal students with students in Watersheds. Based on the results of this study, it was concluded that parents' socio-economic status and motivation had an influence on the high school chemistry learning achievement in Konawe District.
Study of Equilibrium and Kinetics of Pb(II) in Solution Using Persimmon Tannin Gel as an Adsorbent Thamrin Azis; La Ode Ahmad; Fajrin E. Rosa; Laode Abdul Kadir
Jurnal Kimia Sains dan Aplikasi Vol 22, No 6 (2019): Volume 22 Issue 6 Year 2019
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2441.421 KB) | DOI: 10.14710/jksa.22.6.310-316

Abstract

Heavy metals concentrations exceeding the recommended threshold are hazardous for the environment, so there is a need for handling it safely. The purpose of this research was to determine the adsorption capacity and kinetics of adsorption. This research uses an adsorption method in the process of removing Pb(II) heavy metal ions using persimmon tannin gel. Besides the influence of contact time, pH, and the concentration of Pb(II) metal ions on adsorption, a kinetics study was also carried out. The adsorption rate is obtained through the adsorption rate constant (K) and the reaction order generated from the kinetics model. Based on the results of the research, showed the optimum adsorption process, which is 20 minutes and at a pH of 5. The maximum adsorption capacity of 17.62 mg/g with the value of the standard energy changes of Gibbs adsorption (-ΔG° = -14.274 kJ/moll) indicates that the adsorption takes place through physical interaction. The kinetic adsorption gives the adsorption rates a constant of, k = 0.008231 g/mg.min.
Study of Kinetics and Adsorption Isotherm of Methylene Blue Dye using Tannin Gel from Ceriops tagal Thamrin Azis; La Ode Ahmad; Keke Awaliyah; Laode Abdul Kadir
Jurnal Kimia Sains dan Aplikasi Vol 23, No 10 (2020): Volume 23 Issue 10 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2843.999 KB) | DOI: 10.14710/jksa.23.10.370-376

Abstract

Research on the equilibrium and adsorption kinetics of methylene blue dye using tannin gel from the Tingi tree (Ceriops tagal) has been carried out. This study aims to determine the capacity and adsorption kinetics of tannin gel against methylene blue dye. Several parameters, such as the effect of contact time, pH, and methylene blue dye concentration on adsorption, were also studied. Based on the research results, the optimum adsorption process is a contact time of 30 minutes and a pH of 7. The adsorption capacity increased to a concentration of 80 mg/L with a maximum adsorption capacity (qm) of 49.261 mg/g. The adsorption process follows the pseudo-second-order adsorption kinetics model and the Langmuir isotherm model.
Edukasi bagi Masyarakat Tanjung Tiram: Tanaman Obat Keluarga sebagai Upaya Meningkatkan Imunitas Prima Endang Susilowati; La Ode Ahmad; La Ode Kadidae; Nasriadi Dali; La Ode Abdul Kadir
Prosiding Seminar Nasional Pengabdian kepada Masyarakat (SINAPMAS) Perguruan Tinggi Mengabdi: Berkarya dan Berinovasi Untuk Membangun Masyarakat Semakin Tangguh di Mas
Publisher : Prosiding Seminar Nasional Pengabdian kepada Masyarakat (SINAPMAS)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Desa Tanjung Tiram adalah salah satu desa di Kecamatan Moramo Utara Kabupaten Konawe Selatan, yang terletak tidak terlalu jauh dari kota Kendari (ibu kota Provinsi Sulawesi Tenggara). Pada masa pandemic Covid-19, kita harus meningkatkan sistem kekebalan tubuh yang merupakan kekuatan pertahanan tubuh melawan bakteri, virus dan organisme lain penyebab penyakit yang mungkin kita sentuh, hirup atau konsumsi. Meningkatkan daya tahan tubuh adalah salah satu kunci agar tidak tertular virus Covid-19. Masyarakat Desa Tanjung Tiram memiliki minat yang tinggi terhadap pemanfaatan tanaman obat tetapi memiliki pengetahuan yang minim mengenai tanaman yang dapat dimanfaatkan dan cara pengolahannya. Metode yang digunakan adalah sosialisasi melalui webinar serta penanaman TOGA di pekarangan rumah. Berdasarkan kondisi tersebut maka ditawarkan solusi melalui suatu program KKN Tematik Universitas Halu Oleo yang bertujuan untuk mengedukasi masyarakat mengenai tanaman yang dapat dimanfaatkan untuk meningkatkan imunitas tubuh dan mampu merealisasikan penanaman kebun TOGA dalam upaya pencegahan Covid-19. Kegiatan ini dilaksanakan selama 1 bulan yang terdiri dari 4 tahapan yaitu observasi awal, persiapan, pelaksanaan, dan evaluasi.Kata kunci— Covid-19, Edukasi, Imunitas, TOGA
Kinetics and Thermodynamics Equilibrium of Nickel Metal Ions Sorption onto Carbon Nanofibers Irradiated by Ultrasonic Energy Alimin Alimin; La Ode Ahmad Nur Ramadhan; La Ode Ahmad; Fahmiati Fahmiati; Darwin Ismail; Ahmad Zaeni; Muhammad Zakir Muzakkar; Intan Intan; La Agusu; Indriana Kartini; Sri Juari Santosa
ALCHEMY Jurnal Penelitian Kimia Vol 20, No 1 (2024): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.20.1.74223.22-30

Abstract

In this work, we investigated the effects of the heavy metal initial concentration and the pH on the sorption of heavy metal ions onto carbon nanofibers using the liquid phase adsorption technique under ultrasonic energy irradiation. These data were then used to study thermodynamic aspects such as sorption capacity and energy and kinetic parameters such as kinetic model, reaction order, and rate constant of heavy metal sorption on carbon nanofibers. We found that the increase of the heavy metal (nickel) initial concentration was proportional to the amount of heavy metal adsorbed onto carbon nanofibers. The highest uptake of the heavy metal ions' amount onto carbon nanofibers in equilibrium (qe) was 244.00 mg.g-1, achieved at the pH of 8. Langmuir and Freundlich's isotherms were used to find the best-fitted isotherms model. The Langmuir isotherm best fits the sorption equilibrium of the heavy metal ions on Carbon nanofibers. Bothipseudo-first and pseudo-second orders studied the sorption and kinetic parameters of heavy metals on carbon nanofibers. The sorption kinetics model was fitted to the pseudo second-order. Based on the value of Gibbs free energy, the metal ions' sorption onto carbon nanofibers occurs spontaneously.
ANALISIS MINERAL TEMBIKAR DI GUA KUYA DESA PONDOA KABUPATEN KONAWE UTARA Isra Isra; La Ode Ahmad
SANGIA: Jurnal Penelitian Arkeologi Vol 5 No 2: December 2021
Publisher : Laboratorium Jurusan Arkeologi Fakultas Ilmu Budaya Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/sangia.v5i2.1426

Abstract

Dalam penelitan ini fokus pada analisis unsur mineral tembik di situs Gua Kuya Desa Pondoa, Kabupaten Konawe Utara. Dengan tujuan menjawab permasalahan mineral apa sja yang terkandung, jumlah mineral dan kualitas kandungan unsur mineral tembikar dengan mengunakan metode analisis mineralogi. Jenis unsur-unsur yang terdeteksi oleh sinar X melalui analisis XRF dengan lima sampel dengan kriteria motif lingkaran, bulat ganda, garis, titik, menyerupai ujung mata panah, dan bentuk bela ketupat. menghasilkan 17 komposisi kandungan unsur mineral, yaitu Alumenium (A1), Silikon (Si*), Fasfor (P), Kalium (K), Kalsium (Ca*), Titanium (Ti*), Vanadium (V), Chromium (Cr), Mangan (Mn), Ferium/Besi (Fe), Nikel (Ni), Tembaga (Cu), Seng (Zn), Rubidium (Rb), Europium (Eu), iterbium (Yb) dan Renium (Re). Unsur yang paling dominan adalah unsur Silikon (Si) yang rata-ratanya sacara berturut-turut 45,2%, 43,4%, 43,4%, 44,3%, 47,8% dan unsur besi (Fe) 30,0%, 32,2%, 31,6%, 28,5%, 29,6%. Memberikan gambaran bahwa tembikar tersebut dari analisis laboratorium, menujukan dari sampel berbagai motif, merupakan salah satu gambaran tembikar yang dibuat oleh para pengrajin pada masa lampau. Tembikar-tembikar tersebut dikategorikan sebagai perkakas rumah tangga berupa periuk dan mangkuk yang berfungsi untuk wadah mengolah kebutuhan hidup sehari-hari berkualitas sedang dengan presentasi porositas kandungan mineral 40% keatas.
Optimization of Biogas Liquid Waste from Livestock Manure as a Source of Renewable Energy through Microbial Fuel Cell (MFC) Technology Alwahab, Alwahab; Maharani, Pratitis Tri; Nur K., Wa Ode Miranda; Ahmad, La Ode; Alimin, Alimin; Zaeni, Ahmad
Advance Sustainable Science, Engineering and Technology Vol 6, No 2 (2024): February - April
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v6i2.17931

Abstract

This study examines the potential of biogas effluent as a source of electrical energy through microbial fuel cell (MFC) technology. The results showed that the one-room MFC produced a maximum voltage of 1302,2 mV, while the two-room MFC with KMnO4 electrolyte reached 1084,3 mV with an electric current of 0,1 mA. Simultaneously, the two-chamber MFC with K2Cr2O4 produced a maximum voltage of 1675,8 mV and an electric current of 0,99 mA. This potential, with electrical voltage values equivalent to commercial batteries, can improve the efficiency of electrical energy generation from organic waste and open up wider application opportunities in using renewable energy sources. Characterization of the MFC substrate showed a decrease in organic matter of biogas effluent with COD values of 500,96 mg/L and BOD of 300,23 mg/L. MFC bacteria from biogas waste were dominated by Gram-positive rod-shaped and Sarcina, except for one Gram-negative isolate of Spirillum.
Enhanced Adsorption Capacity of Zeolite through Intercalation with Calcium Carbonate of Batissa Violacea Celebensis Shell Waste for Removing Detergent Waste W. O. Haerunnisah; R. Suhardiman; Wahyu; L. O. Ahmad
International Journal of Acta Material Vol. 1 No. 1 (2024): August 2024
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i1.2

Abstract

Zeolites possess pores or layers that can be filled with other molecules, thereby enhancing their acidity, thermal capacity, and surface tension. This, in turn, improves their efficacy in adsorbing organic waste. The main objective of this study is to investigate the material characteristics of ZAA-CaCO3 and its performance in adsorbing detergent waste. The research encompasses several stages, including the preparation of the shell of Biavalvia violacea celebensis waste, natural zeolite preparation, the intercalation process, material characterization, and measurement of adsorption capacity. XRD diffraction analysis revealed that the highest intensity of CaCO3 was observed at angles of 2Ө: 29.4o, 37.4o, and 51.9o. The results of infrared spectroscopy analysis indicated that the chemical activation spectra of ZAA-CaCO3 and ZAA-CaCO3 with a 300oC calcination were similar, except for absorptions at wave numbers 1386 cm-1, 1417 cm-1, 1635 cm-1, 1997 cm-1, and 2359 cm-1, which indicated the presence of carbonate groups of calcium carbonate. Furthermore, morphological analysis using SEM revealed a significant difference between Zeolite Nature, Zeolite Natural Active, and ZAA-CaCO3. The highest percentage of adsorption was observed with ZAA-CaCO3 material at a ratio of 2:1 and a contact time of 120 minutes, resulting in an adsorption capacity of 89.67%.
Effect of Ni Content Variation on the Synthesis of Nickel-Mobile Crystalline Material-41 (Ni-MCM-41) for Methylene Blue Adsorption L. O. Ahmad; H. Hidayat; A. Zaeni; F. Muhamad
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.13

Abstract

The research studied the enhancement of thermal resistance and the increase of adsorption capacity of methylene blue dye by Ni-doped mesoporous MCM-41 adsorbent (Ni-MCM-41). Ni-MCM41 were prepared using hydrothermal method with variation of Ni content ratio (Si/Ni = 10, 20, and 40). This study consisted of several stages including; preparation of 0.24 M sodium 1-heptansulphonate, nickel sulphate 0.025 M, 0.05 M and 0.1 M and 1 M sodium silicate solutions. Synthesis of Ni-MCM-41 which was characterized using FTIR, XRD, DSC and BET. The adsorption process experiments included the preparation of mother liquor and methylene blue standard solution, preparation of standard solution and determination of maximum wavelength, preparation of test solution, contact time variation and concentration variation. Wavelength, contact time variation and concentration variation were determined using UV-Vis spectrophotometer. Analyze the adsorption process by determining the percentage and maximum capacity of adsorption. As well as determining the type of adsorption that occurs through Freundlich and Langmuir adsorption isotherms. FTIR results showed wave numbers between 3400-3200 cm-1 indicating the presence of Si-OH groups, C-H group stretching vibrations at 2925 cm-1, asymmetric stretching vibrations of Si-O at 1239 cm-1, Si-O-Ni bending vibrations at 557 cm-1 and symmetric and asymmetric Si-O-Si stretching vibrations at 1081 cm-1. XRD showed the characteristic structure of MCM-41 with higher crystallinity obtained at Ni-MCM-41 ratio (Si/Ni=40), DSC showed greater thermal resistance of Ni-MCM-41 ratio (Si/Ni=40) at 175.13 oC. The adsorption capacity of methylene blue dye by MCM-41 and Ni-MCM-41 ratio (Si/Ni=40) were 4.0322 mg/g and 4.2735 mg/g, respectively, following Langmuir adsorption isotherm.
Unveiling Non-Covalent Molecular Interactions: A Comprehensive Review Integrating DFT and Crystallographic Insights W. O. N. Haryanti; I W. Sutapa; Sahidin; L. Ahmad; L. O. A. N. Ramadhan
International Journal of Acta Material Vol. 2 No. 1 (2025): August 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v2i1.18

Abstract

Non-covalent interactions (NCIs) are crucial in elucidating molecular recognition, supramolecular architecture, and material properties. This review synthesizes findings from 20 recent studies (2013–2025), with a focus on key interaction types: hydrogen bonding, π–π stacking, Van der Waals forces, and less prevalent modes such as chalcogen bonding and excited-state interactions. Computational methodologies, particularly dispersion-corrected density functional theory (DFT), benchmark datasets (e.g., S22, HB300SPX), and emerging machine learning (ML) corrections, have markedly enhanced the accuracy of NCI modeling. Experimental techniques, including X-ray diffraction and infrared/Raman spectroscopy, continue to substantiate theoretical predictions. Hydrogen bonds are predominant in influencing structural stability and crystal packing, while π–π interactions play a vital role in stabilizing aromatic systems. Van der Waals interactions are particularly significant in layered materials and adsorption phenomena. Recent advancements, such as neural network potentials (NNPs) and non-empirical functionals (e.g., r²SCAN+MBD@HF), provide accurate predictions even in complex environments. This review underscores the interplay between theoretical and experimental approaches and highlights prospective directions in modeling weak interactions across a range of chemical systems.
Co-Authors A. A. Umar A. H. Watoni A. Johan A. L. Giri Toba A. Zaeni Ahmad Zaeni Ahmad Zaeni, Ahmad Alimin Alimin Alimin Alimin, Alimin Alwahab Alwahab Alwahab C. Baskar Darwin Ismail F. Muhamad Fahmiati Fahmiati Fajrin E. Rosa H. Hidayat H. Ritonga Hikmayani I W. Sutapa I. Sulistiyani Indriana Kartini Intan Intan Isra Isra Keke Awaliyah L. O. A. N. Ramadhan L. O. A. N. Ramadhan L. O. A. Nur Ramadhan La Agusu La Ode Abdul Kadir La Ode Ahmad Nur Ramadhan La Ode Ichlas Syahrullah Yunus La Ode Kadidae Laode Abdul Kadir Laode Abdul Kadir Maharani, Pratitis Tri Muhammad Iqbal Sya'bani Istianandar Mukhlis, Rasniaty Muzakkar, Muhammad Zakir Nasriadi Dali Nur K., Wa Ode Miranda PRIMA ENDANG SUSILOWATI R. Suhardiman Robby Sudarman S. J. Sentosa Sahidin Sahidin Sri Juari Santosa THAMRIN AZIS W. O. A. Sulastri W. O. Haerunnisah W. O. N. Haryanti Wa Ode Novi Haryanti Wahyu Yusuf Ahmad Husaeni