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All Journal ALCHEMY Jurnal Penelitian Kimia Hydrogen: Jurnal Kependidikan Kimia Indonesian Journal of Fundamental Sciences ARUS JURNAL SAINS DAN TEKNOLOGI Advance Sustainable Science, Engineering and Technology (ASSET) Sultra Journal of Mechanical Engineering
Ahmad Zaeni
Department Of Chemistry, Universitas Halu Oleo, Kampus Hijau Bumi Tridharma, Anduonohu , Kendari 93232, Indonesia.
Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Other

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Pemanfaatan Limbah Jambu Mete sebagai Mordan dalam Proses Pencelupan Muh Natsir; Hikmayani Hikmayani; Ahmad Zaeni
Indonesian Journal of Fundamental Sciences Vol 6, No 2 (2020)
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (571.546 KB) | DOI: 10.26858/ijfs.v6i2.18758

Abstract

Abstract. Study concerning the utilisation of cashew apple (Anacardium occidentale L.) waste as mordant in dyeing process has been conducted. Cashew apple has a terrible astringent taste. The astringent comes from the composition of tannins of the fruit which is unliked by many people. In the other hand, tannin which is also caused a stain in cloth can use as natural mordant to bind dyes on fabric.Its tannin content makes cashew apple possible to be natural mordant. Mordant can be obtained through maceration using the solvent of ethanol which is acidified with HCl 1%. Effectivity test was performed by washing and absorbance measurement of 1'st and 2'nd of washing water by UV-Vis Spectrophotometer. The result showed that tannins of cashew apple could be used as mordant and the best results produced in mordanted fabric and fixed with fixator, ferrous sulphate.
Performa Microbial Fuel Cell (MFC) bersubstrat Sedimen Teluk Kendari dalam Menghasilkan Tenaga Listrik dengan Variasi Jenis Elektroda Muhammad Hijir Al Gazali; Feri Ichsan Susilo; Ahmad Zaeni
Arus Jurnal Sains dan Teknologi Vol 1 No 1: Oktober (2023)
Publisher : Arden Jaya Publisher

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Abstract

Penelitian mengenai performa Microbial Fuel Cell (MFC) bersubstrat sedimen teluk Kendari dalam menghasilkan tenaga listrik dengan variasi jenis elektroda telah dilakukan. Sedimen dipilih sebagai substrat MFC karena telah dilaporkan dalam penelitian sebelumnya sebagai bahan yang dapat digunakan untuk membangkitkan energi listrik menggunakan teknologi MFC. Dalam penelitian ini digunakan dua jenis elektroda yang berbeda, elektroda karbon (C) dan elektroda paduan tembaga-karbon (Cu/C), untuk merancang dua jenis MFC. Selain itu jenis oksidator yang digunakan adalah kalium dikromat, K2Cr2O7. Hasil pengamatan secara umum memperlihatkan bahwa MFC substrat sedimen menghasilkan voltase yang terus meningkat dari waktu ke waktu selama 36 jam. Selain itu tercatat juga bahwa MFC elektroda C memproduksi tegangan listrik maksimal lebih tinggi dari MFC elektroda Cu/C. MFC elektroda C menghasilkan tegangan maksimal sebesar 432 mV sedangkan MFC elektroda Cu/C sebesar 348 mV. Hal ini memberikan informasi yang dapat menjadi pertimbangan untuk menentukan metode dalam penelitian lebih lanjut.
Pembuatan Pupuk Organik Cair Berbahan Baku Limbah Cangkang Pokea (Batissa Violacea Celebensis) dan Limbah Kulit Pisang Muhammad Hijir Al Gazali; Feri Ichsan Susilo; Ahmad Zaeni
Arus Jurnal Sains dan Teknologi Vol 1 No 1: Oktober (2023)
Publisher : Arden Jaya Publisher

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Abstract

Telah dilakukan pembuatan pupuk organik cair berbahan baku limbah cangkang pokea (Batissa violacea celebensis) dan limbah kulit pisang. Sampel limbah cangkang pokea dikumpulkan dari di kawasan sungai di Desa Pohara Kabupaten Konawe Provinsi Sulawesi Tenggara, dengan kedalaman air antara 10-20 cm. Sedangkan limbah kulit pisang diambil di kawasan pasar sentral kota Kendari Provinsi Sulawesi Tenggara. Kedua jenis sampel limbah tersebut dicampurkan ke dalam air dengan perbandingan 2:5:8 lalu dilakukan proses fermentasi menggunakan menggunakan produk bakteri EM-4. Pupuk organik cair yang dihasilkan memiliki kandungan hara dengan kadar antara lain nitrogen (N-total) 0,67%; fosfor (P) 0,44%; kalium (K) 0,17% dan bahan organik (C-organik) 6,28%. Pupuk organik cair selanjutnya digunakan untuk meningkatkan kadar zat hara tanah, Sampel tanah uji diambil dari area di Desa Puriala Kecamatan Puriala, Konawe Selatan. Hasil pengamatan menunjukkan pupuk organik cair mampu meningkatkan kadar zat hara yang mencakup unsur N, P, K dan C dari sampel tanah uji.
Pengaruh Logam Merkuri (Hg) terhadap Pertumbuhan Jati Putih (Gmelina Arborea) Sarlan; Ahmad Zaeni; Muhammad Hijir Al Gazali
Arus Jurnal Sains dan Teknologi Vol 1 No 1: Oktober (2023)
Publisher : Arden Jaya Publisher

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Abstract

Media yang terkontaminasi Hg dengan konsentrasi berbeda, meenunjukkan respon yang berbeda terhadap tanaman Jati putih (Gmelina arborea), pada berbagai lahan terkontaminasi. Pertumbuhan tanaman berbeda-beda Berdasarkan laju pertambahan jumlah daun, kecepatan pertumbuhan jati putih semakin berkurang dengan bertambahnya konsentrasi merkuri (Hg) pada media tumbuhnya. Pertambahan tinggi batang juga menunjukkan berkurangnya kecepatan pertambahan tinggi batang yang disebabkan adanya merkuri (Hg). Berkurangnya kecepatan pertambahan jumlah daun dan pertambahan tinggi batang tidak begitu signifikan sampai pada konsentrasi merkuri (Hg) pada media melebihi 150 ppm, yang menunjukkan bahwa jati putih (Gmelina arborea) mampu beradaptasi pada media terkontaminasi merkuri (Hg) yang relatif tinggi.
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.
Dual-Chamber Microbial Fuel Cell for Bioelectricity Generation Using Coastal Sediments: A Case from Kendari Bay La Ode Ahmad; Muhammad Iqbal Sya'bani Istianandar; Wa Ode Novi Haryanti; Ahmad Zaeni; Alwahab; La Ode Ichlas Syahrullah Yunus; Yusuf Ahmad Husaeni; Robby Sudarman
Advance Sustainable Science Engineering and Technology Vol. 7 No. 4 (2025): August-October
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i4.2086

Abstract

This study evaluates the potential of Kendari Bay sediment as an alternative source of electrical energy through the dual-chamber Sediment Microbial Fuel Cell (SMFC) technology. The research focused on sediment characterization, performance analysis using an aerator and KMnO₄, post-operation substrate changes, and the identification of electrogenic bacteria. The results showed that the sediment contained 43.24% moisture, 4.23% organic carbon, 1.08% total nitrogen, a C/N ratio of 3.92, pH 7.38, and conductivity of 11.56 mS. The SMFC generated a voltage of 0.404 V (aerator) and 1.628 V (KMnO₄), along with a current of 5.0 µA. After SMFC operation, organic content decreased, with 42.65% moisture, 4.06% organic carbon, 0.97% total nitrogen, a C/N ratio of 4.19, pH 7.86, and conductivity of 15.78 mS. Identified bacteria were Gram-positive Bacillus spp. These findings demonstrate that aerator and KMnO₄ application in dual-chamber SMFC significantly enhance energy conversion efficiency using marine sediment.
Overview of the Development of Graphene Aerogel as an Anode Material in Lithium-Ion Batteries Neneng Andriani Joko; Sahidin; Ahmad Zaeni; Ruslan
Hydrogen: Jurnal Kependidikan Kimia Vol. 14 No. 1 (2026): February 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v14i1.19150

Abstract

The increasing need for energy storage along with the development of portable electronic devices and electric vehicles is driving the development of lithium-ion battery (LIB) anode materials with higher and sustainable electrochemical performance. Commercial graphite currently used as an anode still has limitations in the theoretical capacity and kinetics of lithium ion diffusion. Graphene aerogel (GA), with its porous three-dimensional structure, high surface area, and interconnected conductive network, it has attracted attention as an alternative anode material to improve the specific capacity, velocity and stability of LIB cycles. This review article  was compiled through a literature study of research articles and review articles published in the 2016–2023 range, obtained from reputable scientific databases. The literature was analyzed comparatively to examine the relationship between synthesis methods, structural characteristics, composite formation, and electrochemical performance of graphene aerogel as a LIB anode material. The results showed that the three-dimensional aerogel structure rich in hierarchical pore defects was able to increase the specific capacity to more than 1400 mAh g⁻¹, improve the transport of Li⁺ ions and electrons, and maintain cycle stability at various current densities. The formation of composites with metal oxides or transition metals has also been shown to improve the electrical conductivity and storage capacity of lithium. However, most studies still rely on synthetic graphene or graphene oxide as a precursor, so the sustainability aspect of the material has not been fully integrated. Recent studies on LIB anode graphite recycling show great potential for conversion into high-value-added graphene aerogels, although their application as a battery anode material is still limited. Therefore, future research needs to focus on integrating the LIB anode graphite recycling approach with graphene aerogel synthesis  to produce a high-performance and sustainable anode material.
Optimasi kinerja microbial fuel cell (mfc) berbasis substrat air lindi memproduksibiolistrik dengan penambahan kultur bakteri komersial effective microorganism – 4 (EM-4) Muhammad Hijir Al Gazali; Ahmad Zaeni; Prima Susilowati
Sultra Journal of Mechanical Engineering Vol. 5 No. 1 (2026): Sultra Journal of Mechanical Engineering
Publisher : Program Studi Teknik Mesin, Universitas Sulawesi Tenggara

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Abstract

Studi mengenai pengaruh optimasi kinerja microbial fuel cell (MFC) berbasis substrat air lindi memproduksi biolistrik dengan penambahan kultur bakteri komersial effective microorganism-4 (EM-4) telah dilakukan. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan bakteri EM-4 ke dalam air lindi sebagai substrat MFC terhadap nilai tegangan listrik yang dihasilkan MFC. Penelitian dilaksanakan dengan metode Rancangan Acak Lengkap (RAL), yaitu dua perlakuan tiga perulangan, yaitu perlakuan MFC tanpa penambahan EM-4 ke dalam substrat (kontrol) dan MFC dengan penambahan EM-4 konsentrasi 0,5% ke dalam substrat (MFC-0,5%), dan masing-masing perlakuan diamati sebanyak tiga kali dan berlangsung selama 72 jam. Hasil pengamatan menunjukkan tegangan listrik MFC untuk semua perlakuan memiliki trend yang sama, yaitu kenaikan nilai tegangan listrik yang relatif cepat di awal proses pengamatan lalu cenderung melambat setelah beberapa waktu. Selain itu berdasarkan pengamatan diperoleh informasi bahwa dalam 54 jam pertama nilai tegangan MFC-0,5% relatif lebih tinggi dibandingkan dengan MFC kontrol dan selanjutnya nilai tegangan MFC-0,5 mulai menurun dibandingkan MFC kontrol. Tegangan maksimal yang dihasilkan MFC-0,5% sebesar 797,33 mV pada jam ke-54 sedangkan tegangan maksimal MFC kontrol dicapai pada jam ke-60 sebesar 797,00 mV. Kemudian analisis varian (uji ANOVA) yang dilakukan terhadap nilai tegangan listrik masing-masing MFC menunjukkan bahwa besar tegangan listrik dari kedua varian MFC secara umum tidak berbeda signifikan (P>0,05). Hal ini menunjukkan bahwa konsentrasi penambahan EM-4 yang digunakan dalam penelitian ini belum begitu memberikan impak yang nyata meskipun secara numerik tegangan listrik yang dihasilkan berbeda dengan MFC kontrol. Hal ini memberikan peluang untuk upaya pengembangan riset lebih lanjut terhadap isu terkait.
Co-Authors Alimin Alimin, Alimin Alwahab Darwin Ismail Fahmiati Fahmiati Feri Ichsan Susilo Feri Ichsan Susilo Hikmayani Hikmayani Indriana Kartini Intan Intan La Agusu La Ode Ahmad La Ode Ahmad Nur Ramadhan La Ode Ichlas Syahrullah Yunus Muh Natsir Muhammad Hijir Al Gazali Muhammad Iqbal Sya'bani Istianandar Muzakkar, Muhammad Zakir Neneng Andriani Joko Prima Susilowati Robby Sudarman Ruslan Sahidin Sahidin Sarlan Sri Juari Santosa Wa Ode Novi Haryanti Yusuf Ahmad Husaeni