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All Journal IPTEK The Journal for Technology and Science Jurnal Teknologi The Journal of Pure and Applied Chemistry Research JGE (Jurnal Geofisika Eksplorasi) Jurnal IPTEK Jurnal Litbang Industri CHEMPUBLISH JOURNAL 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 Pinang Masak International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Indonesian Mining Journal JURNAL REKAYASA KIMIA & LINGKUNGAN
Lenny Marlinda
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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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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): December
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.
Catalytic Cracking of Polypropylene-Low Density Polyethylene Pyrolysis Oil over Hierarchical H-ZSM-5 Catalyst Dwi Cahyani, Silvia; Marlinda, Lenny; Evrianti, Yuli; Rimawan, Bagas; Heriyanti, Heriyanti; Rahmi, Rahmi; Sutrisno, Sutrisno
IPTEK The Journal for Technology and Science Vol 35, No 3 (2024)
Publisher : IPTEK, DRPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v35i3.19188

Abstract

The conversion of plastic waste into liquid fuel has become the center of attention by researchers as a way to overcome environmental problems. According to last research, the polypropylene (PP) and low-density polyethylene (LDPE) pyrolysis oil mixture was classified into hydrocarbon range diesel which have the number of carbon atom from C12-C24. Because that, the effect of LDPE/PP pyrolysis oil over hierarchical H-ZSM-5 catalyst on hydrocarbon composition of liquid fuel oil using the catalytic cracking reactor at 200 oC was investigated. Hierarchical H-ZSM-5 catalyst (hH-ZSM-5) was obtained from H-ZSM-5 modified by desilication method using NaOH. Gas chromatography-mass spectrometry showed that the liquid fuel oil from the catalytic cracking of all variations consisted of aliphatic hydrocarbons with some cycloaliphatic compounds. In ratio of 250 mL/0.5 g (oil/catalyst) aromatic hydrocarbon increased from 1.69 area% to 15.58 area% over H-ZSM5 and hH-ZSM-5 respectively. The higher oil quality with shorter hydrocarbon chains in all variations was obtained over hH-ZSM-5 catalyst, namely in the range of C7-C14 or comparable to hydrocarbon range gasoline and kerosene.
PENGARUH PROSES HIDROTERMAL TERHADAP PENINGKATAN NILAI KALOR DAN PENURUNAN KADAR AIR PADA BATUBARA PERINGKAT RENDAH Marlinda, Lenny; Pane, Xena Maharani; Wiratama, Jarot; Zahar, Wahyudi; Khadafi, Muhammad Reza; Rahmi
Indonesian Mining Journal Vol 28 No 1 (2025): Indoneisan Mining Journal, April 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No1.2025.1539

Abstract

As a low-rank coal, brown coal is characterized to have high water content. It is required a method to improve coal quality that can be used for effective coal utilization. One of the methods is to apply thermal dewatering technology which focuses on improving the quality of low-rank coal using water medium and autoclave. The purpose of this study was to determine the effect of coal to water ratio (w/v) and the effect of particle size of a low rank-coal on water content and calorific value using the hydrothermal method. Coal was processed under hydrothermal conditions at 150 °C for 60 min. For a mixture of 100 g of 25 mesh coal and 50 mL of water, the calorific value and water content after the hydrothermal process reached 5,849 kcal/kg and 5.10% (adb), respectively. While for a mixture of 100 g of 40 mesh coal and 50 mL of water, the calorific value and water content after the hydrothermal process reached 5,789 kcal/kg and 4.94% (adb), respectively. The calorific value obtained increased from the initial value of 3,296 kcal/kg and the water content decreased from the initial value of 44.34% for the coal condition before hydrothermal process. It can be concluded that the hydrothermal process with heating without oxygen carried out by a hydrothermal reactor could increase the calorific value of low-rank coal and reduce water content.
Co-Authors . Rahmi, . Abdul Aziz Achmad Roesyadi Adriansyah, Riadi Al Muttaqii, Muhammad Al-Muttaqii, Muhammad Alkaf, Muhammad Rhezi Bayu Ishartono Danawati Hari Prajitno Denny Prabawa, Aditya Dewi, Aisha Andini Indira Dhian Eka Wijaya Diah Riski Gusti Dwi Cahyani, Silvia Dyah Puspitasari, Ratih Edwin Permana Edwin Permana Ermita Meisa Manulang Evrianti, Yuli Excel Emerlan Samiar Wasistha Ezra Bella Ramadhani Putri Fauziah, Sarah Fitri, Selta Hari Prajitno, Danawati Heriyanti Heriyanti, Heriyanti Heriyanti, Heriyanti Heriyanti, Septina Is Ignatius Gunardi Indra Lasmana Tarigan Intan Lestari Intan Lestari ira kusuma dewi Khadafi, Muhammad Reza Ladiva Adinda Lia Anggresani Madyawati Latief Malikhah, Wukhoidatul Marbun, Maja Pranata Mardhatillah Muhammad Al Muttaqii Muhammad Al Muttaqii Muhammad Al Muttaqii Muhammad Al-Muttaqii Muhammad Al-Muttaqii Munifilia Ekasari Murti, Sri Djangkung Sumbogo NEVIATY PUTRI ZAMANI Ngatijo Novianda, Cici Nuraini, Syafira NURUL AZIZAH Nurul Pratiwi Pane, Xena Maharani Peri Oktiarmi Putri Pandulu, Clara Raden Ilham Rahmat Basuki Rahmi Rahmi Rahmi Rahmi Rahmi Rahmi, Rahmi Reni Desriyanti Restina Bemis, Restina Reva Edra Nugraha Rif’at Syauqi Rimawan, Bagas Ritonga, Magdalena Ritonga, Magdalena Ritonga S.D. S. Murti Santiko, Erik Budi Septina Is Heriyanti Sri Djangkung Sumbogo Murti Sudibyo Sudibyo Sugeng Priyanto, Sugeng Sutrisno Tri Utami Vemileza Putri Wahyudi Zahar Wahyudi Zahar Wahyuningsih, Iga Wasistha, Excel Emerlan Samiar Wibimanyu, Putu Adityo Wiratama, Jarot yati, indri Yoga Andika, Oel Taradepa, Adhitya Eko Bagus Yuli Evrianti Br Rajagukguk Yusria Putri, Desta Yustia Wulandari Mirzayanti Yustinah Yustinah Zahar, Wahyudi