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All Journal Metalurgi Jurnal Teknik Kimia Indonesia JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Logic : Jurnal Rancang Bangun Dan Teknologi Greensusmater
Muhammad Yasin Siregar
Department Of Materials Engineering, Institut Teknologi Sumatera, Terusan Ryacudu, Way Hui, Jati Agung, Lampung Selatan 35365, Indonesia
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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MODEL ISOTERM ADSORPSI LITIUM DARI BRINE WATER, BOGOR MENGGUNAKAN ADSORBEN HYDROUS MANGANESE OXIDE (HMO) Siregar, Mhd Yasin
Metalurgi Vol 34, No 3 (2019): Metalurgi Vol. 34 No. 3 Desember 2019
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (647.153 KB) | DOI: 10.14203/metalurgi.v34i3.478

Abstract

The latest industrial revolution or fourth generation is driving computer-based automation systems. The development of science and technology in computers increases the demand for the use of secondary Li-ion batteries. Lithium is an important raw material for cathode materials in rechargeable batteries. At present the need for lithium (Li) is increasing very high, due to the wide range of uses as raw material for rechargeable batteries. Until now the main source of lithium comes from brine water and lithium ores such as spodumene. Brine is one of the most important sources of lithium. Brine water from Ciseeng, Bogor contains 50-80 ppm lithium. Adsorption is a fairly good method for recovering lithium from brine. The adsorbent used is the result of acid activation from the precursors with the method of making solid state. Adsorption is done by varying the adsorbent dose 5; 7.5; 10; 12.5; and 15 g / L and adsorption process time 0.5; 1; 2; 3; 4; and 24 hours to determine the percent of adsorption, adsorption selectivity and the type of adsorption that occurs. The highest dose of lithium adsorption was 7.5 g / L with 7.28% lithium adsorption with selectivity values of ?Li / Na 0.92 and ?Li / K 1.18. Percentage of lithium adsorption with the highest time variation is at 24 hours with lithium adsorption percentage of 15.33% with selectivity values of ?Li / Na 2.38 and ?Li /K 0.89 at a dose of 7.5 g / L. The adsorption isotherm shows that Li adsorption follows the Freundlich isotherm model because the R2 value is higher than the Langmuir isotherm model, so the adsorption that occurs is physical adsorption (physiosorption) and forms a multilayer layer.
Pengaruh Penambahan H2O2 dan Na2S2O5 pada Proses Detoksifikasi Tailing Hasil Pelindian Emas Tiara Triana; Mhd. Yasin Siregar
Jurnal Teknik Kimia Indonesia Vol 18, No 2 (2019)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2019.18.2.2

Abstract

Abstrak. Proses ekstraksi emas dan perak melalui metode pelarutan selektif menggunakan reagen sianida merupakan proses pengolahan yang umum digunakan saat ini. Salah satu tantangan yang hadir dengan pemanfaatan proses pelindian adalah kontrol kandungan weak acid dissociable cyanide (WAD CN) pada tailing hasil proses pelindian guna menghindari terjadinya pencemaran lingkungan. Berdasarkan standar yang ditetapkan oleh International Cyanide Management Institute (ICMI), kandungan sianida yang diperbolehkan untuk dibuang bersama tailing ke lingkungan sebesar <50 ppm. Rangkaian proses yang harus dilakukan untuk menekan kandungan WAD CN pada tailing adalah melalui proses cyanide detoxification. Proses detoksifikasi yang dilakuan adalah dengan menambahkan oksidator berupa H2O2 dan kombinasi dengan Na2S2O5 (sodium metabisulphide/SMBS) dengan rasio H2O2:CN sebesar 2:1, 5:1, 10:1, dan 20:1, serta penambahan SMBS  dengan rasio antara SO2:CN sebesar 4:1 dalam sebuah bottle roll. Penambahan SMBS bertujuan untuk menurunkan jumlah penggunaan oksidator H2O2 yang digunakan. Berdasarkan analisis yang dilakukan diketahui bahwa semakin besar perbandingan antara H2O2:CN maka semakin rendah WAD CN yang dihasilkan, dari 84 ppm sebelum adanya penambahan oksidator menjadi 0,18 ppm pada rasio penambahan 20:1. Selain itu penambahan Na2S2O5 juga menyebabkan penurunan  kandungan WAD CN yang lebih signifikan menjadi 0,31 ppm pada rasio H2O2:CN sebesar 5:1. Adapun variasi pH tidak menunjukkan pengaruh yang signifikan terhadap kadar WAD CN pada saat proses detoksifikasi. Kata kunci: sianidasi, detoksifikasi sianida, wastewater treatment, pelindian emas. Abstract. The Effect of H2O2 and Na2S2O5 Addition in Cyanide Detoxification from Leached-Gold Tailing. Cyanide leaching is the predominant process of gold and silver extraction in large scale mining. The most challenging part related to leaching process of cyanide is controlling the content of weak acid dissociable cyanide (WAD CN) in tailing to prevent environmental pollution. The International Cyanide Management Institute (ICMI) has determinded the cyanide content allowed to be disposed of with tailings into the environment should not more than 50 ppm. Content of WAD CN in tailing can be suppressed by cyanide detoxification process. Detoxification process was conducted by adding H2O2 as an oxidizing agent into the tailings with varying H2O2:CN ratio (2:1, 5:1, 10:1, and 20:1) and combining with the addition of Na2S2O5 (sodium metabisulphide/SMBS) with SO2:CN ratio of 4:1 in a bottle roll. The study showed that the greater the ratio of H2O2:CN, the lower the WAD CN remained in tailing, from 84 ppm before any addition of oxiding agent to 0.18 ppm at ratio of 20:1. Moreover, Na2S2O5 addition was also significantly reduced WAD CN content down to 0.31 ppm at H2O2:CN ratio of 5:1. It also has been identified that pH variation has no significant impact to WAD CN content during detoxification process. Keywords: cyanidation, cyanide detoxification, wastewater treatment, gold leaching. Graphical Abstract
Photocatalytic degradations of organic pollutants in wastewater using hydrothermally grown ZnO nanoparticles Phasa, Agita; Aini, Quratul; Siregar, Muhammad Yasin; Sabilla, Sal; Triyadi, Dedi; Aflaha, Rizky; Khan, Mochammad Ghulam Isaq; Nurfani, Eka
Greensusmater Vol. 1 No. 2 (2024)
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2024.1.2.39-43

Abstract

The increasing prevalence of organic pollutants in wastewater poses a significant environmental challenge due to their persistence and harmful effects. Photocatalysis using semiconductor nanoparticles, such as ZnO, has emerged as a promising approach for pollutant degradation, but optimizing the structural and functional properties of these materials remains a critical challenge. In this study, ZnO nanoparticles were synthesized via a hydrothermal method with varying durations (4, 6, and 8 hours) to investigate the impact of synthesis time on their photocatalytic efficiency. The structural and compositional properties were characterized using SEM, XRD, and EDS analyses, revealing that longer synthesis times improve crystallinity and alter the Zn:O atomic ratio, affecting defect density and stoichiometry. Photocatalytic performance was evaluated through the degradation of an organic pollutant under UV illumination. ZnO-6h exhibited the highest rate constant (k=0.017 min−1), outperforming ZnO-4h (k=0.016 min−1) and ZnO-8h (k=0.013 min−1). This superior activity is attributed to an optimal combination of high crystallinity, intermediate morphology, and the presence of oxygen vacancies that enhance charge carrier dynamics. The findings demonstrate that synthesis duration is a critical parameter in tuning the structural and photocatalytic properties of ZnO nanoparticles. This study provides insights into the design of ZnO-based photocatalysts and underscores their potential for environmental remediation. Future research could extend these findings by exploring scalability and pollutant-specific applications, paving the way for more efficient wastewater treatment technologies.
Effect of Coconut and Sugarcane Fiber Volume Fraction Variations on the Tensile Properties of Epoxy Matrix Composites Fitri, Anisa; Bayu Prasetya; Muhammad Yasin Siregar; Quratul Aini; Wahyu Solafide Sipahutar; Fathar Fathan Mubina
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 01 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i01.192

Abstract

Materials are continually being developed for sustainable applications. Agricultural wastes such as sugarcane bagasse and coconut fiber show great potential as reinforcing agents in polymer composites. This study investigates the effect of varying volume fractions of sugarcane and coconut fibers on the tensile properties of epoxy matrix composites. Four fiber composition ratios were prepared, maintaining a total fiber volume fraction of 50% and matrix fraction of 50%, specifically: 25:25, 20:30, 10:40, and 0:50 (coconut fiber: sugarcane fiber, respectively). All fibers underwent alkali treatment using a 5% NaOH solution to improve interfacial bonding with the epoxy matrix. Composite fabrication was performed via hand lay-up, and tensile tests followed ASTM D3039 standards using a Universal Testing Machine (UTM). The results indicated that the composite with 20% coconut fiber and 30% sugarcane fiber (sample B) exhibited the highest tensile strength of 30.48 MPa and the highest elastic modulus of 2.29 GPa, albeit with a low strain at failure (0.01), suggesting brittle behavior. In contrast, the balanced composition (25:25) demonstrated more stable mechanical performance, achieving a tensile strength of 28.31 MPa and a higher strain of 0.04, indicating improved toughness. The lowest tensile strength, 15.56 MPa, was observed in the 10:40 composition (sample C). Failure analysis revealed modes such as matrix cracking, fiber-matrix debonding, and fiber pull-out, which varied according to fiber composition. In conclusion, this study demonstrates that a balanced volume fraction of coconut and sugarcane fibers yields epoxy composites with optimal tensile strength and a favorable balance between strength and toughness.
Tensile Strength of Epoxy Hybrid Composites Reinforced with Coconut and Sugarcane Fibers Siregar, Muhammad Yasin; Fathar Fathan Mubin; Wahyu Solafide Sipahutar; Anisa Fitri; Mochamad Ghulam Isaq Khan
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 02 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i02.193

Abstract

The use of hybrid composites reinforced with natural fibers has gained increasing attention as a sustainable alternative to synthetic materials, offering advantages in both environmental impact and mechanical performance. This study explores the tensile properties of epoxy-based hybrid composites reinforced with coconut and sugarcane fibers at various volume fractions. The natural fibers were pretreated using a 5% NaOH alkaline solution to enhance interfacial bonding with the matrix. Composite specimens were fabricated by the hand lay-up method, maintaining a total fiber content of 50% and an epoxy matrix of 50%, with varying ratios of coconut to sugarcane fiber. Tensile tests were performed according to ASTM D3039 standards. The results showed that alkali treatment improved fiber wettability, as indicated by a decrease in contact angle, which contributed to stronger fiber-matrix adhesion. The highest ultimate tensile strength (31.02 MPa) was achieved at a 30:20 coconut-to-sugarcane fiber ratio. Hybrid composites with balanced fiber proportions demonstrated superior tensile performance compared to single-fiber composites. These findings indicate that optimizing the ratio of coconut and sugarcane fibers can significantly enhance the mechanical properties of natural fiber-reinforced epoxy composites for engineering applications
The Effect of Volume Fraction Variation on The Mechanical Properties of Epoxy-based Sugarcane Fiber Composites Anisa Fitri; Prasetya, Bayu; Siregar, Muhammad Yasin; Prakoso, Ahmad Andryan; Sipahutar, Wahyu Solafide
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 2 (2025): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i2.85-92

Abstract

The use of natural fibers as reinforcement in composite materials offers an environmentally friendly alternative to synthetic fibers. Among them, sugarcane fiber (bagasse), an agro-industrial byproduct rich in cellulose, hemicellulose, and lignin, holds considerable potential but remains underutilized. This study aims to evaluate the effect of varying sugarcane fiber volume fractions (50%, 60%, and 70%) on the mechanical properties of epoxy resin-based composites. The composites were fabricated using the hand lay-up method, followed by mechanical testing including tensile tests (ASTM D3039) and bending tests (ASTM D790). The results showed that the highest tensile strength of 26.43 MPa was achieved by the E70 sample, while the E50 sample exhibited the highest bending strength at 142.53 MPa. Fractographic analysis revealed that structural defects such as voids, fiber pull-out, and debonding significantly influenced the mechanical performance of the composites. While fiber volume fraction has a notable impact on tensile and bending strengths, the relationship is not strictly linear due to variations in fiber-resin distribution and interfacial bonding quality. These findings suggest that sugarcane fiber-based epoxy composites, particularly with a 50% volume fraction, have strong potential for application in lightweight structural components, furniture panels, or automotive interior parts. Future research may focus on improving interfacial bonding through chemical treatments or hybridization with other natural fibers to further enhance performance.
Co-Authors Aflaha, Rizky Anisa Fitri Anisa Fitri Bayu Prasetya Eka Nurfani Fathar Fathan Mubin Fathar Fathan Mubina Khan, Mochammad Ghulam Isaq Mochamad Ghulam Isaq Khan Phasa, Agita Prakoso, Ahmad Andryan Prasetya, Bayu Quratul Aini Sabilla, Sal Sipahutar, Wahyu Solafide Tiara Triana Triyadi, Dedi