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All Journal Reaktor Jurnal Teknik Kimia Jurnal Fisika Unand JURNAL INTEGRASI PROSES Journal of Natural Sciences and Mathematics Research Jurnal Kimia Riset Indonesia Chimica Acta 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
Universitas Pembangunan Nasional Veteran Jawa Timur
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.
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
KAJIAN ADSORPSI LOGAM CU DENGAN ADSORBEN SILIKA GEL Wisnu Adi Prasojo; Srie Muljani
Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa Vol. 2 No. 5 (2024): Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/algoritma.v2i5.163

Abstract

Adsorption is a separation process on a particular substance based on the affinity of a compound to a solid. The adsorption process requires an adsorbent as an absorbent material and an adsorbate as an absorbed component. The adsorbent that is often used to absorb Cu2+ ions is silica gel. Silica gel is a rigid gel that is amorphous. In silica gel there are two main bonding groups, namely siloxane and silanol groups which cause silica gel to easily absorb polar molecules, especially water. The purpose of this research is to get the best mass of silica and the effect of the initial concentration of Cu ions on the final concentration of Cu metal. In this study, two operating conditions were varied, namely the mass of silica gel adsorbent 0.4 grams; 0.6 grams; 0.8 grams; 1 gram; 1.2 grams and the initial concentration of Cu metal 3 ppm; 4 ppm; 5 ppm; 6 ppm; 7 ppm. The results of this study showed that the silica content of bagasse ash was 70.97% with a surface area of 283.802 m2/g. The best result of this study reduced the content of copper metal (Cu) by 88% in the condition of silica gel mass of 1.2 grams. The adsorption isotherm shows that the data is more in line with the Freundlich equation. The resulting equation is y = 0.4268x + 0.4969 with an R2 value of 0.9837.
Precipitated calcium oxide nanosize from limestone and blood clam shells Pujiastuti, Caecilia -; Muljani, Srie; Sumada, Ketut
Journal of Natural Sciences and Mathematics Research Vol. 9 No. 1 (2023): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

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

Abstract

Calcium oxide (CaO) is a product that is needed by various types of industries such as the pharmaceutical, chemical, agricultural and health industries. CaO is generally produced by the calcination method of CaCO3 materials such as calcium carbonate rocks or from various types of shells. The calcination method requires a large amount of energy because the operating temperature is above 1000 C and the resulting calcium oxide product is still micrometer size. This study developed nanosize precipitated CaO from two calcium sources, namely blood clam shells and limestone. For clam shells using hydrochloric acid as a solvent and sodium hydroxide as a precipitating agent, while for limestone using phosphoric acid as a solvent and potassium hydroxide as a precipitating agent. The effect of acidity (pH) and calcination temperature on the characteristics of the precipitated CaO was observed. The blood calm shell produces precipitated CaO 85-92 % with a particle size of 200-250 Nm and the limestone produces precipitated CaO 42-66% with a particle size of 250-300 Nm 
Co-Authors A.R Yelvia Sunarti Abdullah, Affan Zein Adelita Sidabutar Adinda Dwi Febriana Agustina, Meri Aisyah Alifatul Zahidah Rohmah Amalia, Ayu Rizka Amelia Putri Kusherawati Anggelina, Efline Anggoro, Achmad Rahditya Viman Anhar, Farhan Auladana Putra Apprinda Wahyudyah Winali AR Yelvia Sunarti Arianti, Rahma Dea Rerindra Astuti, Dwi Hery Atika Nandini Azzahra Maritza Putri Bambang Wahyudi Bambang Wahyudi Wahyudi Caecilia - Pujiastuti Caecilia Pujiastuti Caecilia Pujiastuti Caecilia Pujiastuti Caecillia Pujiastuti Cahyo, Mei Syella Kurnia Putri Candra, Adi Citra Siwi Estiningtyas Clareta Rahmawati Maudy Damayanti, Savira Farizqy Della Arthamevia Diah Ayu Sulistia Diah Nur Fitri Midayoga Dwi Hery Astuti Dwipayanti, Juvita Retno Dyah Suci Perwitasari Ely Kurniati Ely Kurniati Erwan Adi Saputro Faiqoh, Iklimatul Farida Pulansari Fatikhah Cahyani Frida Nadhila Yansa Hasanah Hasan Besuni Indah Dwi Wahyuningsih Isni Utami ISNI UTAMI J.E. Sutanto Jawwad, Muhammad Abdus Salam Joanne Rizma Pramitha Kamil, Ihsan Ketut Sumada Kindriari Nurma Wahyusi Kusuma, Kurnia Arifiani L.Urip Widodo, Yohandrik Novel Karaman Lely Amoi 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 Nofitasari, Luluk Novanto, Satria Agung Nove Kartika Noviardyanti, Fara Zabrina Nur Annisa Nur Hapsari Nurul Widji Triana Nurul Widji Triana Pamoedji, Yemima Natalia Eka Kristiyanti Pangestu, Titan Obby Pertiwi, Beta Cahaya Pradana, Alfian Rizki Prasetyo Hadi Pujiastuti, Caecilia Pujiastuti, Caecilia Pujiastuti, Caecilia Pujiastuti, Caecilia Pujiastuti, Caecilia - Putri, Alisyah Ananda Rahmadini Rosika Fatimah Ramadhan, Mochamad Rafli Reva Edra Nugraha Rifaldi, Kornelius Rosilina, Mega S Suprihatin Sani Sani Silviya Nur Ridha Sintha Soraya Santi Sri Redjeki Sukirmayadi Sukirmayadi Sulaiman, Yusri Risyad Sunarti, A.R Yelvia Suprianti, Lilik Suprihatin Suprihatin Suprihatin Suprihatin Suprihatin Susilowati Susilowati sutiyono sutiyono Tazkia Jaufillail Titi Susilowati Utami, Noni Esti Verbiawan, Erza Anggara Wahyu Hidayah Widyaningrum, Nilam Putri Wiraya, Wira Arta Wisnu Adi Prasojo Yuani Firanita Yulia S, Putri Arysanti