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All Journal Agrointek JESCEE- Journal of Emerging Supply Chain, Clean Energy, and Process Engineering
Rachman, Rinaldi Medali
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Synthesis and Characterization of Antibacterial ZnO - Functionalized Polysulfone Membrane Rumintang, Ribka; Rachman, Rinaldi Medali
Journal of Emerging Supply Chain, Clean Energy, and Process Engineering Vol 1 No 1 (2022): Journal of Emerging Supply Chain, Clean Energy, and Process Engineering
Publisher : Universitas Pertamina

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57102/jescee.v1i1.14

Abstract

Membrane technology is an emerging alternative in water treatment. This study aims to synthesize a filtration membrane made of polysulfone polymer with the addition of ZnO in order to enhanced the membrane antibacterial/antibiofouling property. The membrane was manufactured via Non-Induced Phase Separation (NIPS) phase inversion of the polymer casting solution. The composition of ZnO was varied into 0%, 0.5%, 1%, 2%, and 3%. The results of the membrane synthesis were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), pure water permeability test, and selectivity test with a turbid meter. The hydrophilic properties of the membrane were analysed by measuring the contact angle, and the antibacterial characteristics were analyzed by the disc diffusion test. Analysis by FTIR showed the presence of a sulfone functional group (S=O) derived from polysulfone polymer and a methyl functional group (C-H) derived from PEG. SEM analysis showed that each variation of the polysulfone membrane had an upper surface structure that was close to the honeycomb structure. The pure air permeability test shows that the membrane is porous and able to pass through pure air. Selectivity test with a turbid meter showed that the membrane is selective to the feed stream that passes through it. Analysis of contact angle measurements showed that the polysulfone membrane surface was hydrophilic. Antibacterial activity analysis showed that polysulfone membrane had antibacterial ability with the largest zone of inhibition with a value 1.8 mm on the membrane with the largest concentration of ZnO.
One Step Hydrothermal Synthesis of Nickel Doped TiO2 Nanotube Budi Nursanto, Eduardus; Sinaga, Resa Mayori Ridoi; Floresyona, Dita; Rachman, Rinaldi Medali; Nugroho, Agung
Journal of Emerging Supply Chain, Clean Energy, and Process Engineering Vol 2 No 1 (2023): Journal of Emerging Supply Chain, Clean Energy, and Process Engineering
Publisher : Universitas Pertamina

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57102/jescee.v2i1.59

Abstract

TiO2 is one of the photocatalyst materials that is widely used and proven for environmental treatment. To increase the activity of TiO2, TiO2 has been modified into a nanotube shape with nickel metal doping. The TiO2 nanotubes with Ni doping have been synthesized with one step hydrothermal process. In this research, it shows that nickel doped with TiO2 led to a reduction of crystal size and band gap energy. The smaller crystalline size and lower band gap energy enhanced its photocatalytic activity. The best results for photocatalytic activity were TiO2/Ni with a crystal size of 7.30 nm and a band gap energy value of 3.12 eV. The photocatalytic activity of TiO2/Ni was tested by degrading methylene blue under mercury lamp radiation, with the best result of 92.73 % degradation of methylene blue, within 240 minutes of photocatalytic activity.
Optimalisasi kondisi aktivasi arang bonggol jagung sebagai desikan menggunakan metode Taguchi Jatmiko, Tri Hadi; Suherman, Donovan Rendi; Rachman, Rinaldi Medali; Praharasti, Anggita Sari; Prasetyo, Dwi Joko
AGROINTEK Vol 19, No 3 (2025)
Publisher : Agroindustrial Technology, University of Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/agrointek.v19i3.22878

Abstract

Preserving food can be achieved through several methods, one of which is drying. Dried foods are easier to store and distribute. Environmental factors such as temperature and humidity play a crucial role in food preservation and must be controlled to increase its shelf life. A desiccant can be used to regulate humidity levels. Activated carbon is a material that can be used as a desiccant, which can be produced from biomass such as corn cobs. This study focuses on optimizing the conditions for using corncob charcoal as a desiccant by using a Taguchi orthogonal array. The optimization process involves determining the optimal KOH concentration, immersion time, and the ratio of charcoal to KOH volume. Results showed that KOH concentration was the most significant factor in activating carbon from corn cobs, followed by the ratio and immersion time. The optimal conditions for activating carbon from corn cobs as a desiccant were found to be a KOH concentration of 2%, a ratio of 10 g charcoal to 150 mL KOH, and an immersion time of 2 hours, resulting in a water vapor adsorption capacity of 0.3949 g/g
Production Simulation Hydrogen Gas from Heavy Fuel Oil Gasification and Life Cycle Assessment (LCA) using UNISIM Design R460.1 and GABI TS Software Rachman, Rinaldi Medali; Fransisco Rupang Pangkung, Dionisius
Journal of Emerging Supply Chain, Clean Energy, and Process Engineering Vol 4 No 2 (2025): Journal of Emerging Supply Chain, Clean Energy and Process Engineering
Publisher : Universitas Pertamina

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57102/jescee.v4i2.120

Abstract

Heavy fuel oil utilization via combustion leads to negative impacts towards the environment. A cleaner way of heavy fuel oil utilization should be implemented, gasification is one. Gasification process can convert heavy fuel oil feed into valuable gas like hydrogen. Based on the simulation result, hydrogen purity (on dry basis) was obtained at 98,02% (volume). Study on temperature and addition of gasifying agent was also done. At high gasification temperature, more hydrogen tends to be produced. Steam addition also gives positive effect on hydrogen yield. Environmental impacts evaluation using life cycle assessment method has been performed. Based on the simulation, this process significantly contributes to climate change with the score of 2.630 kgCO2eq. Carbon dioxide utilization via enhanced oil recovery can overcome this problem. From economical point of view, annual net income after tax is at Rp 45.956.031.943,16 with the annual return on investment rate of 59,46%, which is economically justified.
Co-Authors Eduardus Budi Nursanto Floresyona, Dita Fransisco Rupang Pangkung, Dionisius Jatmiko, Tri Hadi Nugroho, Agung Praharasti, Anggita Sari Prasetyo, Dwi Joko Rumintang, Ribka Sinaga, Resa Mayori Ridoi Suherman, Donovan Rendi