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All Journal Jurnal Teknologi Bulletin of Chemical Reaction Engineering & Catalysis The Journal of Pure and Applied Chemistry Research JGE (Jurnal Geofisika Eksplorasi) Jurnal IPTEK Jurnal Litbang Industri JOURNAL ONLINE OF PHYSICS Science and Physics Education Journal (SPEJ) Indonesian Mining Journal Communications in Science and Technology Martabe : Jurnal Pengabdian Kepada Masyarakat Jurnal Geofisika Jurnal Pengabdian Masyarakat Indonesia Jurnal IPTEK Bagi Masyarakat Prosiding Konferensi Nasional PKM-CSR Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Paradharma: Jurnal Aplikasi IPTEK Jurnal Pengabdian Masyarakat (JPM) Pinang Masak Bulletin of Chemical Reaction Engineering & Catalysis Indonesian Mining Journal JURNAL REKAYASA KIMIA & LINGKUNGAN
Lenny Marlinda
Universitas Jambi
Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences

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Hydrocracking of Non-edible Vegetable Oils with Co-Ni/HZSM-5 Catalyst to Gasoil Containing Aromatics Danawati Hari Prajitno; Achmad Roesyadi; Muhammad Al-Muttaqii; Lenny Marlinda
Bulletin of Chemical Reaction Engineering & Catalysis 2017: BCREC Volume 12 Issue 3 Year 2017 (December 2017)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.12.3.799.318-328

Abstract

Biofuel has been considered as one of the environmentally friendly energy sources to substitute fossil fuel derived from non-edible vegetable oil. This research aims to investigate the effect of the non-edible vegetable oil composition on a specific hydrocarbons distribution contained in biofuel and the aromatics formation through hydrocracking reaction with the Co-Ni/HZSM-5 catalyst. The formation of aromatics from non-edible vegetable oils, such as: Cerbera manghas, rubber seed, and sunan candlenut oils, containing saturated, mono- and polyunsaturated fatty acids is presented. The hydrocracking reaction was carried out in a pressure batch reactor, a reaction temperature of 350 oC for 2 h, reactor pressure of 15 bar after flowing H2 for 1 hour, and a catalyst/oil ratio of 1 g/200 mL. Liquid hydrocarbon product was analyzed by gas chromatography-mass spectrometry. Based on the GC-MS analysis, hydrocracking on three different oils indicated that polyunsaturated fatty acids were required to produce relatively high aromatics content. The sunan candlenut oil can be converted to gasoil range hydrocarbons containing a small amount of aromatic through hydrocracking reaction. Meanwhile, the aromatics in liquid product from hydrocracking of Cerbera manghas and rubber seed oils were not found. 
EFFECT OF VACUUM RESIDUE AND PETROLEUM BENZINE AS THE ADDITIVE CALORIFIC VALUE AND MOISTURE OF COAL Ezra Bella Ramadhani Putri; Wahyudi Zahar; Lenny Marlinda
Indonesian Mining Journal Vol 25 No 1 (2022): INDONESIAN MINING JOURNAL, Vol. 25 No. 1, April 2022
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol25.No1.2022.1260

Abstract

Upgrading the coal is a process that increases the calorific value of low-rank coal through decreasing the moisture content of the coal. This method usually uses mixed heavy oil to close the opened pores after coal upgrading. The additives have a molecule structure like heavy oil. The aim of this study is to determine the effect of additives on the moisture content and calorific value after coal upgrading process. Coal upgrading in this study applies several variations i.e., coal particle size and coal mass mixed with an additive which is a mixture of vacuum residue and petroleum benzine with a ratio of  0.005 g: 1 mL as a coater. Before upgrading process, the moisture content and calorific value of the coal is 13.39 %adb and 6,663 cal/g db. After the process, the lowest moisture content of the coal in the ratio of coal (b/v) and additives was 4:3 with 21.75% ad. The highest calorific value of the coal was shown in the ratio of coal (b/v) and additives 1:1 with 7,189 kcal/kg. The lowest moisture content is indicated by the particle size of -120 mesh. The highest calorific value of coal is shown by the particle size of -120 mesh.
Magnetically Separable Humic Acid-Chitin Based Adsorbent as Pb(II) Uptake in Synthetic Wastewater Ngatijo; Marlinda, Lenny; Malikhah, Wukhoidatul; Ishartono, Bayu; Basuki, Rahmat
Indonesian Journal of Chemical Studies Vol. 2 No. 1 (2023): Indones. J. Chem. Stud., June 2023
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v2i1.22

Abstract

Modification of humic acid (HA) from the peat soil of Jambi province, Indonesia with chitin and magnetite to form Fe3O4/HA-chitin has been successfully carried out. The successful synthesis was identified from characterization with functional group analysis, crystal analysis, magnetic strength measurement, and morphological and elemental analysis. The application of Fe3O4/HA-chitin to adsorb Pb(II) ion was analyzed using the Lagergren, Ho, Santosa, and RBS kinetics models (kinetics study) and the Langmuir, Freundlich, Dubinin-Radushkevich (DR), and Temkin isotherm model (isotherm study). The kinetics study followed the Ho model (pseudo-second order) with R2 and kHo of 0.9997 and 10264.59 g/mol min, respectively. The results of the data applicable to the Freundlich model showed that several sites were capable of multilayer adsorption (B) with a large enough adsorption capacity of 929.19 mg/g (about 28 times higher than the monolayer adsorption of Langmuir data). However, the outermost layer had a feeble adsorption energy of 0.51 kJ/mol, as measured by Temkin's adsorption energy. In the layer between the first layer (Langmuir) and the outermost layer (Freundlich), the DR isotherm was measured at a capacity of 104.87 mg/g (qD, the 3rd layer of the first layer) the adsorption energy was measured at 12.91 kJ/mol. A cross-study on the prediction of adsorption energy using the Santosa and RBS kinetics models showed that the RBS model had an adsorption energy value (26.45 kJ/mol) that was closer to the adsorption energy value of the Langmuir isotherm (27.55 kJ/mol).
IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN BERDASARKAN DATA ANOMALI GRAVITY CITRA SATELIT- STUDI KASUS SUMUR AIR PANAS DI DESA PEMATANG BULUH KECAMATAN BETARA, TANJUNG JABUNG BARAT Novianda, Cici; Dewi, Ira Kusuma; Marlinda, Lenny
Jurnal Geofisika Vol 22 No 2 (2024): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v22i2.591

Abstract

Identifikasi struktur bawah permukaan di desa Pematang Buluh dilakukan dengan metode gravitasi berdasarkan anomali gravitasi yang dihasilkan dari citra satelit. Pengukuran citra satelit didapatkan dari hasil pengukuran Geodetic Satellite (GeoSat) dan European Remote Sensing-1 (ERS-1) yang telah terkoreksi hingga koreksi udara bebas. Pengolahan data dilakukan untuk memperoleh nilai Complete Bouger Anomaly (CBA). Metode yang digunaan yaitu metode analisa derivative (First horizontal derivative dan Second vertical derivative) dan pemodelan secara 2 dimensi. Hasil yang diperoleh pada analisis struktur terhadap grafik SVD diidentifikasi terdapatnya patahan berupa patahan naik pada kedua slicing. Hasil pemodelan bawah permukaan secara 2D terdapat dua lapisan batuan dan diinterpretasi adanya sistem panas bumi. Lapisan pertama dengan densitas 2.21 gr/cm3 berupa batu lempung diinterpretasi sebagai batuan penutup (Caprock). Lapisan kedua dengan densitas 2.35 gr/cm3 berupa batu pasir diinterpretasi sebagai reservoir. Pada lapisan kedua diinterpretasi terdapat sub cekungan yang diduga adanya lapisan akuifer. Kata kunci : Struktur bawah permukaan, Metode gravity, SVD (Second Vertical Derivative), Pemodelan 2D
PENGUATAN KOMPETENSI GURU IPA SMA NEGERI 11 KOTA JAMBI PADA PENGGUNAAN APLIKASI CHEMDRAW Riski Gusti, Diah; Lestari, Intan; Marlinda, Lenny; Rahmi, Rahmi; Eka Wijaya, Dhian
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 8, No 2 (2025): MARTABE : JURNAL PENGABDIAN KEPADA MASYARAKAT
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v8i2.777-782

Abstract

Pendidikan merupakan bagian penting dari pembangunan suatu negara karena membantu generasi muda memperoleh pengetahuan dan keterampilan yang diperlukan untuk menghadapi tantangan yang akan datang. . Dalam pendidikan Indonesia, guru di bidang ilmu pengetahuan alam harus memiliki pemahaman yang mendalam tentang konsep kimia, biologi, dan fisika. Tujuan kegiatan pengabdian ini adalah dalam rangka mengoptimalkan potensi teknologi dalam meningkatkan kualitas pembelajaran IPA di SMA Negeri 11 Kota Jambi. Penguatan kompetensi guru dalam penggunaan aplikasi ChemDraw menjadi suatu kebutuhan yang mendesak. Melalui peningkatan kompetensi ini, diharapkan para guru dapat lebih mandiri dalam merancang dan melaksanakan pembelajaran yang inovatif dan menarik, sehingga dapat meningkatkan ketertarikan dan pemahaman siswa terhadap materi pelajaran IPA. Dengan adanya pelatihan dan pendampingan penggunaan aplikasi ChemDraw, guru-guru IPA telah mengetahui dan penerapan penggunaan aplikasi ChemDraw.
PEMANFAATAN MINYAK BERAT HASIL PERENGKAHAN KATALITIK MINYAK PLASTIK POLYPROPYLENE-LOW DENSITY POLYETHYLENE UNTUK MENINGKATKAN KUALITAS LIGNIT Marlinda, Lenny; Mardhatillah; Raden Ilham; Rahmi; Muhammad Al Muttaqii
Indonesian Mining Journal Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No2.2024.1544

Abstract

The most obvious characteristics of lignite are its high moisture content (30-50%) and relatively low calorific value compared to other types of coal. This causes low combustion efficiency, making it not optimal for use as fuel. In this study, the slurry dewatering process was applied to coal that has a low calorific value of 3,662 cal/g and a moisture content of 37.29%. The addition effect of heavy oil from catalytic cracking of Polypropylene-Low Density Polyethylene (PP/LDPE) plastic waste pyrolysis oil on improving quality of lignite was investigated in this study. Heavy oil was used as additive. The ratio of 120 mesh lignite to heavy oil used was 100:15, 100:30, 100:45, 100:60, 100:75, and 100:90 (g/mL). Coal was carried out with a slurry dewatering process in an autoclave at various temperatures of 140 and 150 °C for 60 min. The test results obtained the highest calorific value of 6,374 cal/g and the moisture content of 2.81% for a ratio of lignite to heavy oil of 100: 45 g/mL at a temperature of 140 °C.
PEMANFAATAN MINYAK BERAT HASIL PERENGKAHAN KATALITIK MINYAK PLASTIK POLYPROPYLENE-LOW DENSITY POLYETHYLENE UNTUK MENINGKATKAN KUALITAS LIGNIT Marlinda, Lenny; Mardhatillah; Raden Ilham; Rahmi; Muhammad Al Muttaqii
Indonesian Mining Journal Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No2.2024.1544

Abstract

The most obvious characteristics of lignite are its high moisture content (30-50%) and relatively low calorific value compared to other types of coal. This causes low combustion efficiency, making it not optimal for use as fuel. In this study, the slurry dewatering process was applied to coal that has a low calorific value of 3,662 cal/g and a moisture content of 37.29%. The addition effect of heavy oil from catalytic cracking of Polypropylene-Low Density Polyethylene (PP/LDPE) plastic waste pyrolysis oil on improving quality of lignite was investigated in this study. Heavy oil was used as additive. The ratio of 120 mesh lignite to heavy oil used was 100:15, 100:30, 100:45, 100:60, 100:75, and 100:90 (g/mL). Coal was carried out with a slurry dewatering process in an autoclave at various temperatures of 140 and 150 °C for 60 min. The test results obtained the highest calorific value of 6,374 cal/g and the moisture content of 2.81% for a ratio of lignite to heavy oil of 100: 45 g/mL at a temperature of 140 °C.
Paving Block from LDPE Plastic and Pyrolysis Residue Marlinda, Lenny
Jurnal IPTEK Vol 26, No 2 (2022)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2022.v26i2.2563

Abstract

The purpose of this study was to utilize residues of the plastic waste pyrolysis process and LDPE plastic as a substitute of cement in the manufacture of paving blocks. The residual pyrolysis process used was a pyrolysis residue of a mixture of polypropylene (PP) and low density polyethylene (LDPE) plastic waste with mass ratio of 100% PP, 75: 25%, 50: 50%, 40: 60%, 25: 75, and 100% LDPE. The mass ratio of LDPE plastic and pyrolysis residue were 70:30%, 60:40%, and 50:50%. The comparison of sand and residual pyrolysis of plastic waste used was 1: 1. The block paving obtained was characterized using SEM and quality tests were carried out with parameters of compressive strength and water absorption. The results of SEM analysis indicate the existence of a bond between sand and plastic pyrolysis residues. The variations in the type of plastic ratio in pyrolysis process indicate the varying of compressive strength and water absorption of the paving blocks
ESTIMASI SUMBERDAYA BATUGAMPING DI PT. SEMEN BATURAJA TBK KABUPATEN OGAN KOMERING ULU PROVINSI SUMATERA SELATAN Azizah, Nurul; Ritonga, Magdalena Ritonga; Marlinda, Lenny
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 1 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i1.475

Abstract

Limestone is a rock that is generally whitish, fine-grained, composed of calcium carbonate, and formed below sea level. The Sumatra region, especially in the South Sumatra region, has potential mineral resources in the form of limestone located in the Ogan Komering Ulu district. The study area is included in the Baturaja Formation (Nmb) with the Baturaja limestone unit and the Gumai Formation (Nmg) with the Gumai limestone unit, which are stratigraphically deposited in harmony. The formation of origin in the study area is divided into 2, namely the form of structural origin consisting of structural valley landforms (S1), and the form of anthropogenic origin consisting of non-mine landforms (A1), mine slope landforms (A2) and sump landforms (A3). In the research area in the field observations, there is a geological structure in the form of a right horizontal fault. With field observations and the presence of limestone resources in the research area, mining can be carried out in the area. In limestone mining, estimation is needed to be able to calculate resources before the mining process takes place. In this study, the depth of the limestone layer is modelled with a block model with the aim of being able to see the distribution of layers to be estimated. The estimation of limestone resources uses the Inverse Distance Weighting (IDW) method by estimating the value of the area that does not have an inferred value.
Cobalt-nickel supported on desilicated HZSM-5 for the conversion of Reutealis trisperma (blanco) airy shaw oil to liquid hydrocarbon products Marlinda, Lenny; Rahmi; Aziz, Abdul; Roesyadi, Achmad; Hari Prajitno, Danawati; Mirzayanti, Yustia Wulandari; Al-Muttaqii, Muhammad
Communications in Science and Technology Vol 10 No 1 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.1.2025.1570

Abstract

Desilication/alkaline treatment and metal impregnation were used to create the HZSM-5 catalyst supported by Co-Ni. These catalysts' isotherm patterns combined type I and type IV isotherms. This isotherm pattern showed a hysteresis loop at comparatively higher pressures. The pore size distribution of the mesoporous HZSM-5 catalysts was situated between 6 and 12 nm in size. Its use in the hydrocracking of Reutealis trisperma (Blanco) airy shaw oil (RTO) to produce biofuel was investigated. The results of the catalytic test showed that the hydrocarbon makeup of the biofuel was comparable to that of fuel. In comparison to HZSM-5, the mesoporous Co-Ni/HZSM-5 catalyst enhanced n-paraffin by 46.32 area% and aromatic by 34.18 area% in the hydrocracking of RTO.
Co-Authors . Rahmi, . Abdul Aziz Achmad Roesyadi Adinda, Ladiva Adriansyah, Riadi Al-Muttaqii, Muhammad Alkaf, Muhammad Rhezi Bayu Ishartono Danawati Hari Prajitno Denny Prabawa, Aditya Dhian Eka Wijaya Diah Riski Gusti Dyah Puspitasari, Ratih Edwin Permana Edwin Permana Excel Emerlan Samiar Wasistha Ezra Bella Ramadhani Putri Hari Prajitno, Danawati Heriyanti Heriyanti, Heriyanti Heriyanti, Septina Is Ignatius Gunardi Indra Lasmana Tarigan Intan Lestari Intan Lestari ira kusuma dewi Khadafi, Muhammad Reza Madyawati Latief Malikhah, Wukhoidatul Manulang, Ermita Meisa Mardhatillah Muhammad Al Muttaqii Muhammad Al Muttaqii Muhammad Al Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Murti, Sri Djangkung Sumbogo NEVIATY PUTRI ZAMANI Ngatijo Novianda, Cici NURUL AZIZAH Pane, Xena Maharani Raden Ilham Rahmat Basuki Rahmi Rahmi Rahmi Rajagukguk, Yuli Evrianti Br Reni Desriyanti Ritonga, Magdalena Ritonga, Magdalena Ritonga S.D. S. Murti Septina Is Heriyanti Sri Djangkung Sumbogo Murti Syauqi, Rif’at Tri Utami Vemileza Putri Wahyudi Zahar Wasistha, Excel Emerlan Samiar Wiratama, Jarot Yoga Andika, Oel Taradepa, Adhitya Eko Bagus Yustia Wulandari Mirzayanti Zahar, Wahyudi