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All Journal Jurnal Teknik ITS Jurnal Sains dan Seni ITS IPTEK The Journal for Technology and Science Jurnal Keteknikan Pertanian Tropis dan Biosistem Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Journal of Petroleum and Geothermal Technology Journal of Earth Energy Science, Engineering, and Technology Jurnal Ilmu Kedokteran dan Kesehatan Indonesia

Randy Yusuf Kurniawan

Prodi Rekayasa Minyak Dan Gas Institut Teknologi Sumatera

Author-ID : 865889

Agriculture, Biological Sciences & Forestry Arts Humanities Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Health Professions Mechanical Engineering Public Health

Published : 9 Documents Claim Missing Document

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Articles

Development of Activated Carbon Material from Oil Palm Empty Fruit Bunch for CO2 Adsorption Irsandi Dwi Oka Kurniawan; Randy Yusuf Kurniawan; Nurul Widiastuti; Lukman Atmaja; Anis Shofiyani
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

This study aims to determine the CO2 adsorption capacity of activated carbon doped with nitrogen. Activated carbon is carbonized from oil palm empty fruit bunches (OPEFB). The results of lignocellulose analysis from OPEFB, 42.87 wt% of hemicellulose, 27.31 wt% of lignin, 23.02 wt% of cellulose and 6.80 wt% of ash. Potassium hydroxide is used as an activating agent and urea as a nitrogen precursor with an OPEFB mass: urea is 1: 1 to 1: 5. The method used is single-step, where carbonization-activation-doping is made into one process. Activated activated carbon is characterized by Fourier-Transform Infrared (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) isotherm, and scanning electron microscope (SEM) with energy dispersive X-ray. Infrared spectra showed that N-doped activated carbon was successfully synthesized. Diffractogram shows an amorphous structure with graphitic plane (002) and (100). ACN11 produces the highest surface area of 1309.47 m2 g-1. The results of gravimetric CO2 adsorption at 30 °C and 1 atm conditions resulted in the largest CO2 adsorption capacity of ACN14 at 15.02 wt%. The ACN11 and ACN14 adsorption kinetics models followed the intraparticle diffusion model with R2 values of 0.95 and 0.97.

Synthesis of TiO2/Zeolite-A Composite for The Removal of Methylene Blue on Direct Sunlight Yasokhi Fatkhasari; Nafiah Afuw Rouf; Wahida Annisa Ermadayanti; Randy Yusuf Kurniawan; Arseto Yekti Bagastyo
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Wastewater generated from textile industry contains azo dye, (e.g., methylene blue), which is inefficient to decompose by using biological processes, and requires long treatment time. TiO2 is the most widely used adsorbent for industrial applications and photocatalytic degradation of various azo dyes in textile wastewater. Its anatase is the most effective and widely used photocatalyst, however the wide band gap of TiO2 has limited its widespread application in industry since it needs to be excited by ultraviolet (UV) light. In order to overcome this issue, combination of adsorbent zeolite and TiO2 into the composite was used in this study so that TiO2 can adsorb methylene blue under direct sunlight. Composition of 1 g TiO2 and 1 g Zeolite composite was used in batch method to eliminate different methylene blue concentrations, i.e., 25; 50; 75; 100; 125; 150; 200; and 250 ppm by means of adsorption process under direct sunlight. The experimental result showed that addition of zeolite was able to considerably improve adsorption capacity of TiO2 on direct sunlight in the range of 97.2 – 99.3 % of methylene blue removal. The highest removal was observed in the case of lower concentrations of methylene blue, i.e., in the range of 25-50 ppm.

Sintesis Zeolit-A dari Abu Dasar Batubara dengan Pemisahan Fe dan Ca Randy Yusuf Kurniawan; Nurul Widiastuti
Jurnal Sains dan Seni ITS Vol 6, No 1 (2017)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Penelitian ini bertujuan untuk mensintesis zeolit-A dari abu dasar dengan pemisahan kandungan Fe dan Ca sebelum dilakukan peleburan. Zeolit-A disintesis menggunakan ekstrak yang dihasilkan melalui metode peleburan abu dasar pada suhu 750oC dalam atmosfer udara yang diikuti proses hidrotermal pada suhu 100°C selama 12 jam. Hasil menunjukkan bahwa kristalinitas zeolit-A dengan pemisahan Fe dan Ca sebesar 88,64% dengan tingkat kemurnian yang lebih besar, sementara pada zeolit-A tanpa pemisahan Fe dan Ca yang telah dilaporkan pada penelitian sebelumnya didapatkan kristalinitas sebesar 84,19% dengan tingkat kemurnian yang lebih rendah.

Synthesis N-Doped Activated Carbon from Sugarcane Bagasse for CO2 Adsorption Randy Yusuf Kurniawan; Irsandi Dwi Oka Kurniawan; Lukman Atmaja; Nurul Widiastuti
IPTEK The Journal for Technology and Science Vol 30, No 3 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v30i3.5469

Nitrogen-doped activated carbon (SBACN) was synthesized from sugarcane bagasse waste as acarbon source and urea as nitrogen source through potassium hydroxide (KOH) activation for 2 h at high temperature via two step methods. The synthesized SBCN was characterized using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Fourier Transform Infrared (FTIR). The results showed that the SBCN has low degree crystallinity and graphitization with highly developed micropores due to synergistik activation effect of KOH and urea. These characteristics provide an important contribution to carbon dioxide adsorption capacity, which can reach up to 11,20% wt and this value is higher than pristine activated carbon. The results indicating that the presence of this nitrogen functionalities is found to have a beneficial influence on the carbon dioxide adsorption characteristic in standart condition and exhibit considerable potential in solid adsorption.

SINTESIS NANOKOMPOSIT FE3O4/C DARI TANDAN KOSONG KELAPA SAWIT DAN POTENSINYA SEBAGAI ANODA BATERAI LITHIUM Randy Yusuf Kurniawan; Aulia Mutiara Hikmah; Dwi Miftha Kurnia; Stevy Canny Louhennapessy; Junanta Junanta; Ismail Haris Setiawan; Auliya Putri Hardiyani
Dalton : Jurnal Pendidikan Kimia dan Ilmu Kimia Vol 8, No 1 (2025)
Publisher : Universitas Islam Kalimantan MAB Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/dl.v8i1.18437

Tandan Kosong Kelapa Sawit (TKKS) merupakan limbah kelapa sawit yang dapat dikonversi menjadi material karbon bernilai tambah. Hasil konversi karbon disintesis dengan Fe3O4 menjadi nanokomposit yang memiliki potensi sebagai anoda baterai lithium. Penelitian ini bertujuan menentukan metode aktivasi karbon dari TKKS agar memiliki porositas optimal. Karbon yang terbentuk disintesis menjadi nanokomposit dan dikarakterisasi menggunakan XRD, FTIR, serta Adsorpsi-Desorpsi N2 (BET). Hasil sintesis nanokomposit dikarakterisasi dengan XRD dan BET. Hasil karakterisasi menunjukkan karbon dengan porositas terbesar diperoleh melalui aktivasi perendaman KOH (TKP) dengan luas permukaan 852 m²/g dan volume pori 0,64 m³/g. Nanokomposit disintesis dengan rentang variasi massa karbon (NFC-X) 0,25–1,5 g. Karakterisasi menunjukkan porositas terbesar pada NFC-1,25 dengan luas permukaan 1080 m²/g dan volume pori 0,89 m³/g tanpa merusak struktur nano Fe₃O₄, yang dibuktikan dengan tidak berubahnya puncak khas material Fe₃O₄.

A Design Analysis of Shell and Tube Type Recuperator in Organic Rankine Cycle Power Plant with Low-Temperature Geothermal Steam Source MUHAMMAD RIFQI DWI SEPTIAN; Fitri Rusmaladewi; Friska Hasugian; Rozi Afdi; Dwi Miftha Kurnia; Stevy Canny Louhenapessy; Randy Yusuf Kurniawan; Setiadi Wira Buana
Journal of Petroleum and Geothermal Technology Vol. 6 No. 1 (2025): May
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jpgt.v6i1.15142

Organic Rankine Cycle (ORC) power generation systems offer an effective means to harness low-grade geothermal heat. A crucial component in improving ORC thermal performance is the recuperator, which recovers residual heat from the turbine outlet to preheat the working fluid. This study focuses on the design and evaluation of a shell and tube recuperator using R-600a as the working fluid, through thermodynamic and heat transfer analyses. Key parameters such as LMTD (32.38 °F), effectiveness (0.434), and heat transfer area (60.35 m²) were calculated. Pressure drops were within acceptable limits (tube side: 4.46 psi; shell side: 0.475 psi), and the dirt factor of 0.0038 indicates good resistance to fouling. The results support the feasibility of implementing the proposed design in small to medium-scale geothermal ORC applications. Keywords: geothermal; ORC; recuperator; shell and tube; thermal analysis

Analisis Deskriptif Durasi dan Jumlah Konsumsi Rokok, Kadar Hemoglobin dan Tingkat Pengetahuan Bahaya Karbon Monoksida pada Petugas Kebersihan Jalan Aulia Mutiara Hikmah; Zahara Fadilla; Randy Yusuf Kurniawan; Yuri Pradika; Gita Wideani
Jurnal Ilmu Kedokteran dan Kesehatan Indonesia Vol. 5 No. 1 (2025): Jurnal Ilmu Kedokteran dan Kesehatan Indonesia
Publisher : Pusat Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jikki.v5i1.6629

This study explores the relationship between smoking habits, hemoglobin levels, and awareness of carbon monoxide (CO) risks among street cleaning workers. Smoking is one of the most common sources of CO exposure, which can bind to hemoglobin and reduce oxygen transport in the body. A total of 67 street cleaning workers in West Jakarta were involved in this research, using a descriptive analytic approach. Data were collected through blood tests for hemoglobin levels, as well as interviews and questionnaires to assess smoking habits and knowledge of CO. The findings show that most respondents were light smokers (1–10 cigarettes per day), and 43% had been smoking for less than five years. While 66% of participants had normal hemoglobin levels, 33% had elevated levels, which may reflect the body’s response to reduced oxygen availability. Interestingly, 70% of respondents were aware of the health risks of CO, but knowledge tended to decline among long-term or heavy smokers. This indicates a gap between behavior and risk awareness. The study highlights the need for ongoing health education targeted at outdoor workers to increase understanding of CO exposure and prevent potential health impacts.

Proximate Analysis and Exponential Model of Activated Carbon from Durian (Durio zibethinus) Peel from South Lampung: Analisis Proksimat dan Model Exponensial Karbon Aktif dari Kulit Buah Durian (Durio zibethinus) Asal Lampung Selatan Pangestuti, Martasari Beti; Witoyo, Jatmiko Eko; Kurniawan, Randy Yusuf; Cavendish, Amedeo
Journal of Tropical Agricultural Engineering and Biosystems - Jurnal Keteknikan Pertanian Tropis dan Biosistem Vol. 13 No. 3 (2025): December 2025
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Durian (Durio zibethinus) peel is a major agro-waste with high lignocellulosic content and functional groups, making it a promising precursor for activated carbon. This study synthesized and characterized activated carbon from South Lampung durian peel using potassium hydroxide (KOH) activation at 0 M, 1 M, and 2 M. Proximate analysis (moisture and ash content, volatile matter, fixed carbon) was conducted, and exponential regression models were developed to examine the effect of KOH concentration. Results showed significant effects (p < 0.05) of KOH on all parameters. Moisture decreased from 59.23±2.02% to 7.19±3.27%, ash from 6.29±0.31% to 1.45±0.52%, and volatile matter from 7.81±0.45% to 2.09±0.02%, while fixed carbon increased from 84.88±0.31% to 89.72±0.52%. All parameters followed exponential trends with high R² values, indicating strong model fit. These findings confirmed that KOH activation improves activated carbon quality, and exponential models provide predictive insight. Therefore, durian peel from South Lampung is promising for high-quality activated carbon production.

Geomechanical Characterisation Analysis of Reservoirs Based on Well Logging Data for CO₂ Injection Applications Rusmaladewi, Fitri; Louhenapessy, Stevy; Hendrawan, Rezki Naufan; Kurnia, Dwi Miftha; Kurniawan, Randy Yusuf
Journal of Earth Energy Science, Engineering, and Technology Vol. 8 No. 3 (2025): JEESET VOL. 8 NO. 3 2025
Publisher : Penerbitan Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/7dve7558

This study investigates reservoir geomechanical characterization for CO₂ injection applications in the Akimeugah Basin using well-logging and 2D seismic data as the basis for constructing a one-dimensional Mechanical Earth Model (MEM) for well FRD2. The main log data used include sonic logs (Vp, Vs), density, and other logs to calculate dynamic elastic parameters, rock strength (UCS, tensile strength), pore pressure, and in-situ stress profiles (Sv, SHmax, Shmin), which are then validated by horizon and fault interpretation from seismic sections. Analysis of stress polygons, stress profiles, and stereonet plots at depths of 3100–4000 ft indicates that the stress regime is dominated by Normal Faulting with a maximum horizontal stress direction (SHmax) of approximately 150°, with no indication of overpressure but with depth-dependent geomechanical sensitivity to changes in injection pressure. The evaluation results show that the deeper interval (around 4000 ft) exhibits higher rock strength, a wider safe pressure window, fracture gradients well above pore pressure, and narrower zones of potential failure, making it the most suitable and safest target for CO₂ injection, while the 3100–3500 ft interval remains prospective but requires stricter pressure control.

Co-Authors Aulia Mutiara Hikmah Auliya Putri Hardiyani Bagastyo, Arseto Yekti Cavendish, Amedeo Dwi Miftha Kurnia Dwi Miftha Kurnia Fadilla, Zahara Fitri Rusmaladewi Friska Hasugian Gita Wideani Hendrawan, Rezki Naufan Irsandi Dwi Oka Kurniawan Irsandi Dwi Oka Kurniawan Ismail Haris Setiawan Jatmiko Eko Witoyo Junanta Junanta Kurnia, Dwi Miftha Louhenapessy, Stevy Lukman Atmaja MUHAMMAD RIFQI DWI SEPTIAN Nafiah Afuw Rouf Nurul - Widiastuti Pangestuti, Martasari Beti Rozi Afdi Rusmaladewi, Fitri Setiadi Wira Buana Shofiyani, Anis Stevy Canny Louhenapessy Stevy Canny Louhennapessy Wahida Annisa Ermadayanti Yasokhi Fatkhasari Yuri Pradika

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