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All Journal Reaktor Jurnal Teknik Kimia Jurnal Fisika Unand Journal of Natural Sciences and Mathematics Research Konversi Jurnal Kimia Riset CHEESA: Chemical Engineering Research Articles International Journal of Economics, Business and Accounting Research (IJEBAR) Jurnal Inovasi Teknik Kimia ASEAN Journal of Community Engagement G-Tech : Jurnal Teknologi Terapan Nusantara Science and Technology Proceedings International Journal of Eco-Innovation in Science and Engineering (IJEISE) Jurnal Altifani Penelitian dan Pengabdian kepada Masyarakat AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Pengbdian Teknik Mesin Journal Serambi Engineering (JSE) Algoritma: Jurnal Matematika, Ilmu Pengetahuan Alam, Kebumian dan Angkasa JURNAL REKAYASA KIMIA & LINGKUNGAN
SRIE MULJANI
Program Studi Teknik Kimia, Fakultas Teknik & Sains, Universitas Pembangun Nasional “Veteran” Jawa Timur, Surabaya
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Sintesis dan Karakterisasi Kalsium Fosfat dari Cangkang Bekicot dengan Metode Presipitasi Pangestu, Titan Obby; Damayanti, Savira Farizqy; Santi, Sintha Soraya; Muljani, Srie
CHEESA: Chemical Engineering Research Articles Vol. 4 No. 2 (2021)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v4i2.8931.82-90

Abstract

Cangkang bekicot memiliki potensi sebagai bahan baku sintesis kalsium fosfat karena kandungan kalsium yang sangat tinggi, yaitu sekitar 99 %. Kalsium fosfat dapat diaplikasikan sebagai biomaterial karena sifatnya yang sama dengan jaringan penyusun tulang. Pada saat ini kebutuhan akan biomaterial sangat tinggi dan telah memberi dampak yang cukup besar terutama dalam bidang kedokteran ortopedi. Penelitian ini bertujuan untuk mengkaji karakteristik kalsium fosfat dengan menggunakan bahan baku cangkang bekicot. Penelitian ini dilakukan dengan metode presipitasi dengan variasi pH dan suhu sintering. Cangkang bekicot di kalsinasi pada suhu 900 oC lalu di campurkan dengan larutan asam fosfat sesuai dengan rasio molar Ca/P 1,67. Pengendapan kalsium fosfat dilakukan saat proses presipitasi dengan penambahan NaOH untuk mengatur pH pada rentang 11 dan 12. Selanjutnya dilakukan proses sintering pada suhu 600, 700, 800, dan 900 oC. Karakterisasi kalsium fosfat yang dihasilkan menggunakan XRF, XRD, dan SEM. Hasil penelitian menunjukkan perolehan hidroksiapatit (Hap) mencapai 100% pada pH 12, dan suhu 600 oC dengan struktur kristal amorf.
Pembuatan Pupuk Granul Dari Limbah Gypsum dan Urea Pamoedji, Yemima Natalia Eka Kristiyanti; Widyaningrum, Nilam Putri; Muljani, Srie; Perwitasari, Dyah Suci; Sumada, Ketut
Jurnal Teknik Kimia Vol 19, No 1 (2024): Jurnal Teknik Kimia (JUTEKK) Vol.19, No.1, 2024
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v19i1.4826

Abstract

Gipsum adalah salah satu dari sejumlah mineral yang mengendap. Mineral-mineral lain yang termasuk dalam kelompok ini meliputi karbonat, borat, nitrat, dan sulfat. Jenis gipsum yang paling umum dijumpai adalah varietas hidrat kalsium sulfat dengan rumus kimia CaSO4.2H2O. Kandungan Ca pada gipsum dimanfaatkan sebagai campuran pupuk organik yang dapat membantu perkembangan akar, bunga, dan buah pada tanaman. Salah satu pengolahan padatan gypsum menjadi pupuk granul dengan penambahan urea sebagai penambah unsur nitrogen. Penelitian ini bertujuan untuk mencari kadar nitrogen yang sesuai dengan SNI (Standar Nasional Indonesia) didalam pupuk granul. Metode yang digunakan adalah pencampuran padatan gypsum yang telah kering sebanyak 5000 gram dengan penambahan urea 1000 gram; 1250 gram; dan 2500 gram, dan di granulasi selama 30 menit; 60 menit; dan 90 menit. Produk disaring sesuai dengan ukuran, kemudian di analisa kadar nitrogennya. Berdasarkan hasil penelitian, diperoleh kadar nitrogen tertinggi pada proses granulasi dengan penambahan urea 1250 gram dengan waktu 60 menit yaitu sebesar 2,65%.
MODEL MATEMATIK LAJU PENGUAPAN AIR LAUT DENGAN PROSES EVAPORASI MENGGUNAKAN METODE POLYNOMIA Indah Dwi Wahyuningsih; Silviya Nur Ridha; Srie Muljani
Jurnal Inovasi Teknik Kimia Vol 9, No 3 (2024)
Publisher : Fakultas Teknik Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31942/inteka.v9i3.9985

Abstract

Rendahnya produksi garam yang diperoleh dapat disebabkan kemarau basah yang membuat panen produksi garam tidak maksimal dan pemanfaatan teknologi garam yang belum merata. Banyaknya masyarakat memproduksi garam menggunakan cara tradisional yang hanyamemaanfaatkan panas matahari dan kincir angin. Dalam penelitian ini, peneliti memanfaatkan matahari dengan bantuan teknologi spray untuk mempercepat proses evaporasi air laut untuk mengasilkan garam. Kemudian menyusun model matematik laju penguapan air laut menggunakan metode polynomial dengan variasi jumlah spray dan aliran debit yang nantinya dapat mengetahui kecepatan angka evaporasinya. Hasil optimasi variasi jumlah spray dan aliran debit mendapatkan bahwa penguapan air laut yang optimal pada debit 1403763,4955 cm3/jam dengan variasi jumlah spray 3;5;7 dan debit 1615348,1843 cm3/jam dengan variasispray 3 dan 7 karena hasil yang di dapat menunjukkan persen kesalahan tidak melebihi 10 %.
PREPARATION OF CALCIUM-POTASSIUM-PHOSPHORUS (Ca-K-P) AS A MATERIAL FOR SOIL AND PLANT IMPROVEMENT USING THE PRECIPITATION METHOD Muljani, Srie; Matovanni, Maudy Pratiwi Novia; Pertiwi, Beta Cahaya; Novanto, Satria Agung; Yulia S, Putri Arysanti
Jurnal Teknik Kimia Vol 19, No 2 (2025)
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v19i2.5072

Abstract

Kalsium karbonat (CaCO3) merupakan material yang banyak terdapat di Indonesia, baik dalam bentuk batuan maupun dalam berbagai jenis limbah cangkang kerang. Penelitian ini memanfaatkan batuan CaCO3 sebagai sumber CaO untuk pembuatan komposit kalsium-kalium-fosfat (Ca-K-P) dengan metode presipitasi. Komposit Ca-K-P dapat digunakan untuk memperbaiki kualitas tanah masam, perakaran dan kualitas tanaman karena adanya unsur kalsium (Ca), kalium (K) dan fosfor (P). Unsur fosfor merupakan hasil reaksi kimia antara CaCO3 dengan asam fosfat encer (H3PO4) membentuk larutan kalsium fosfat. Proses presipitasi terjadi ketika larutan KOH ditambahkan ke dalam larutan Kalsium Fosfat hingga mencapai tingkat keasaman pada kisaran pH 3 – 11. Suhu sintering pada kisaran 400 – 700℃. Pada pH 10 dan suhu kalsinasi 600℃, diperoleh komposisi produk berupa kalsium oksida (CaO) sebesar 44,60%, kalium oksida (K2O) sebesar 6,65% dan fosfor (P2O5) sebesar 38,58%.
Sintesis dan Karakterisasi Al-MCM-41 dari Kaolin: Pengaruh Konsentrasi HCl terhadap Struktur dan Kapasitas Adsorpsi Iodin Abdullah, Affan Zein; Putri, Alisyah Ananda; Muljani, Srie; Nugraha, Reva Edra
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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

Abstract

Al-MCM-41 can be synthesized using kaolin from Bangka Belitung without requiring additional sources of silica or aluminum. The process begins with calcination of kaolin to produce metakaolin, followed by HCl treatment for dealumination, which helps remove impurities and excess alumina. This step is crucial to achieve the optimal SiO₂/Al₂O₃ mole ratio, making the material effective as an adsorbent or catalyst. The hydrothermal process enhances silica polymerization and pore formation due to the strong electrostatic interactions between CTAB and silicate anions, increasing the pore size. The mesoporous structure and SiO₂/Al₂O₃ ratio of Al-MCM-41 are influenced by the CTAB concentration and the extent of dealumination through HCl treatment. In this synthesis, CTAB acts as a structure-directing agent, forming the hexagonal mesoporous framework, while HCl concentration regulates the removal of alumina from kaolin. To optimize the process, HCl concentrations of 2M, 4M, and 6M were tested to evaluate the extent of alumina and impurity removal. The 6M HCl treatment produced a SiO₂/Al₂O₃ ratio of 25.359, which aligns with the commercial Al-MCM-41 standard from ACS Material. Additionally, the iodine adsorption test demonstrated significantly higher adsorption capacity (653.14 mg/g) for Al-MCM-41 compared to kaolin (76.2 mg/g).
Peningkatan Kualitas Bio-Oil Hasil Pirolisis Cangkang Kelapa Sawit Berstandar Pelumas Organik Wiraya, Wira Arta; Rifaldi, Kornelius; Muljani, Srie; Siswati, Nana Dyah; Karaman, Novel
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.249-254.2025

Abstract

Palm kernel shells are biomass waste that has the potential to be processed into bio-oil through pyrolysis, but its quality needs to be improved to meet organic lubricant standards. This study aims to improve the quality of bio-oil through a transesterification process with activated carbon-NaOH catalyst and the addition of guar gum as a thickening agent. Pyrolysis was carried out at a temperature of 300°C for 60 minutes, and transesterification at a temperature of 60°C for 2 hours with a methanol:bio-oil ratio of 6:1. The results showed that increasing the amount of catalyst up to 10% increased the yield of methyl ester, while the addition of guar gum increased the kinematic viscosity to 7.9 cst, approaching commercial lubricant standards such as top 1 Evo 5W-30 and pertamina fastron gold 5W-30. However, the flash point is still lower than industrial lubricants. Thus, the quality of bio-oil from palm kernel shell pyrolysis can be improved to approach organic lubricant standards, making it a more environmentally friendly alternative lubricant and has the potential for industrial applications.
Estimation of Critical Properties of Eucalyptol, Alpha-Terpineol, Limonene, and Caryophyllene in Eucalyptus Oil (Melaleuca leucadendra) Using the Group Contribution Method Prasetyo, Muhammad Dewa; Muljani, Srie; Sari, Amilia Putri Puspita
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.42409

Abstract

Critical property estimation of compounds in eucalyptus oil has been conducted using the Group Contribution method to improve the accuracy of calculations of critical temperature (Tc), critical volume (Vc), critical pressure (Pc), and normal boiling point (Tb). This study updates the previous research by adding a comparative analysis of estimation errors between methods. Eucalyptus oil was extracted using microwave hydrodistillation followed by vacuum distillation to determine experimental data, then estimated using the Joback, Constantinou-Gani (CG), Wilson-Japerson (WJ), and Marrero-Pardillo (MP) methods. The results show that the Wilson-Japerson method provides the most accurate Pc estimation with %AAE of 12.7819%, the Marrero-Pardillo method is best for Vc with %AAE of 5.3393%, the Marrero-Pardillo method provides the most accurate Tc estimation with %AAE of 2.7143%. The Joback method is most suitable for Tb with a %AAE of 20.0828%. The application of the results of this study in the essential oil industry is crucial in optimizing the extraction and distillation process, increasing the efficiency of separation units, developing refining technology, and formulating essential oil-based products. The method with the best accuracy can be used in the design of distillation equipment and thermodynamic reactors, thereby improving production efficiency and product quality in the pharmaceutical, cosmetic, and natural chemical industries.
Optimization of Biodiesel Synthesis from Avocado Seeds Using Response Surface Methodology (RSM) Nicander, Priscillia stevanies; Muljani, Srie; Darma, Apriandi Putra
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.42035

Abstract

The synthesis of biodiesel from avocado seed oil has been successfully conducted. This study aimed to determine the optimized parameters for the transesterification reaction using Response Surface Methodology (RSM). The transesterification reaction was carried out with variations in the methanol mole ratio of 1:4, 1:6, and 1:8 at temperatures of 40 C, 50 C, and 60 C, utilizing 1 wt% KOH relative to the oil. The avocado seed oil, obtained from the extraction process, has a free fatty acid content of 1.95%. The RSM results indicated that the optimized parameters for biodiesel production were at a temperature of 60 C with a methanol mole ratio of 1:6. The final yield achieved was 82%, calculated based on the initial weight of the oil. The biodiesel produced had a cetane number of 75, a density of 877.4 kg/m, and a viscosity of 4.768 cSt. These values meet the SNI standards, which require a minimum cetane number of 51, a density of 850890 kg/m, and a viscosity of 2.36 cSt.
Synthesis and Characterization of Calcium Phosphate Using Two Stages of Process Anggoro, Achmad Rahditya Viman; Arianti, Rahma Dea Rerindra; Pujiastuti, Caecilia; Sumada, Ketut; Muljani, Srie
Jurnal Rekayasa Kimia & Lingkungan Vol 19, No 1 (2024): Jurnal Rekayasa Kimia & Lingkungan (June 2024 )
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v19i1.37829

Abstract

Calcium phosphate, a naturally occurring biomaterial found in human and animal bones and teeth, possesses desirable properties such as strength, biocompatibility, and the ability to stimulate tissue growth. This study investigates the synthesis of calcium phosphate through a precipitation method without calcination. The process involves dissolving raw materials in phosphoric acid, followed by precipitation using KOH as the precipitating agent. The resulting precipitate was then calcined for 3 hours. The calcium phosphate product was characterized using XRF, XRD, and SEM-EDX techniques. The results indicate a Ca-P molar ratio ranging from 1.855 to 2.302, with the predominant phase identified as -calcium pyrophosphate. SEM analysis reveals a plate-like morphology with agglomerated particles ranging in size from 888 nm to 7.79 m. The synthesized calcium phosphate holds potential for various biomedical applications due to its unique properties and composition.
KINETIKA REAKSI HIDROLISIS ENZIMATIS SELULOSA MENJADI GLUKOSA DARI KULIT DURIAN (DURIO ZIBETHINUS RUMPH) MENGGUNAKAN ENZIM SELULASE Maharani, Eka Ferdinda Putri Ayu; Agustina, Meri; Redjeki, Sri; Muljani, Srie; Pujiastuti, Caecilia
Jurnal Teknik Kimia Vol 19, No 2 (2025)
Publisher : Program Studi Teknik Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnal_tekkim.v19i2.5155

Abstract

The production of durian in Indonesia causes pollution of the environment by durian skin waste, so it is necessary to utilize durian skin. Durian skin contains 50-60% cellulose, 5% lignin, 5% starch, and other compounds.  The cellulose content in durian peel is utilized for making glucose by enzymatic hydrolysis method carried out under pH 5 conditions, 10% cellulase enzyme concentration, 50oC temperature, and 160 rpm stirring speed. Optimization of the enzymatic hydrolysis process depends on understanding the reaction kinetics that provide information about the reaction rate and conversion efficiency. This study aims to determine the reaction kinetics equation of enzymatic hydrolysis of cellulose to glucose from durian peel using cellulase enzyme and determine the effect of substrate concentration and hydrolysis time on product concentration. Substrate concentration and hydrolysis time have a directly proportional relationship to product concentration. At 5% substrate concentration and 180 minutes, the highest product concentration of 1.7% was obtained. This study was conducted with hydrolysis times of 60, 90, 120, 150, and 180 minutes and variations in substrate concentrations of 1%, 2%, 3%, 4%, and 5%. The conversion of enzymatic hydrolysis of cellulose to glucose at 1% substrate concentration was 69.43% with a reaction rate equation of
Co-Authors A.R Yelvia Sunarti Abdullah, Affan Zein Adelita Sidabutar Agustina, Meri Ajiz, Hendrix Abdul Amalia, Ayu Rizka Amelia Putri Kusherawati Amoi, Lely Anggelina, Efline Anggoro, Achmad Rahditya Viman Anhar, Farhan Auladana Putra AR Yelvia Sunarti Arianti, Rahma Dea Rerindra Astuti, Dwi Hery Bambang Wahyudi Bambang Wahyudi Wahyudi Caecilia - Pujiastuti Caecilia Pujiastuti Caecilia Pujiastuti Caecillia Pujiastuti Cahyo, Mei Syella Kurnia Putri Candra, Adi Clareta Rahmawati Maudy Damayanti, Savira Farizqy Darma, Apriandi Putra Diah Nur Fitri Midayoga Dwi Hery Astuti Dyah Suci Perwitasari Erliyanti, Nove Kartika Erwan Adi Saputro Faiqoh, Iklimatul Farida Pulansari Febriana, Adinda Dwi Heru Setyawan Indah Dwi Wahyuningsih Isni Utami ISNI UTAMI J.E. Sutanto Jawwad, Muhammad Abdus Salam JE Sutanto Kamil, Ihsan Ketut Sumada Kindriari Nurma Wahyusi Kusuma, Kurnia Arifiani L.Urip Widodo, Yohandrik Novel Karaman Luluk Edahwati Maharani, Eka Ferdinda Putri Ayu Matovanni, Maudy Pratiwi Novia Maulana, Mochamad Titus Mega Rosilina Mega Rosilina Mirwan, Mohammad Moch Iqbal Darmawan Mochamad Titus Maulana Mochamad Titus Maulana Mohammad Falahul Habibaini Nuruddin Mu’tasim Billah Nana Dyah Siswati, Anwar Zain and Mohammad Nicander, Priscillia stevanies Nofitasari, Luluk Novanto, Satria Agung Nove Kartika Noviardyanti, Fara Zabrina Nur Annisa Nur Hapsari Pamoedji, Yemima Natalia Eka Kristiyanti Pangestu, Titan Obby Pertiwi, Beta Cahaya Pradana, Alfian Rizki Prasetyo Hadi Prasetyo, Muhammad Dewa Pujiastuti, Caecilia Pujiastuti, Caecilia Pujiastuti, Caecilia Pujiastuti, Caecilia Pujiastuti, Caecilia - Putri, Alisyah Ananda Ramadhan, Mochamad Rafli Reva Edra Nugraha Rifaldi, Kornelius Rosilina, Mega S Suprihatin Sani Sani Sari, Amilia Putri Puspita Silviya Nur Ridha Sintha Soraya Santi Sri Redjeki Sukirmayadi Sukirmayadi Sunarti, A.R Yelvia Suprianti, Lilik Suprihatin Suryandari, Ade Sonya Susilowati sutiyono sutiyono Titi Susilowati Trianna, Nurul Widji Utami, Noni Esti Verbiawan, Erza Anggara Wahyu Hidayah Widiyastuti Widiyastuti Widyaningrum, Nilam Putri Wiraya, Wira Arta Wisnu Adi Prasojo Yulia S, Putri Arysanti