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All Journal FLUIDA Jurnal Teknologi Sainteknol : Jurnal Sains dan Teknologi
Shoerya Shoelarta
Politeknik Negeri Bandung
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Other

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The Effect of Plasma Electrolysis for Biodiesel Synthesis Using Waste Cooking Oil as a Raw Material and KOH Catalyst Shoerya Shoelarta; Saripudin; Rahmat Dani Dwi Fedianto; Moch Adli Darojat; Sudrajat Harris Abdulloh; Irwan Hidayatulloh; lidya elizabeth
Fluida Vol. 16 No. 2 (2023): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v16i2.3987

Abstract

The high consumption of cooking oil in Indonesia is directly proportional to the production of used cooking oil waste that can pollute the environment. To overcome this problem, used cooking oil is used as a biodiesel feedstock using the plasma electrolysis method. Plasma electrolysis is a synthesis process by applying a high voltage to the process. This study aims to determine the effect of the plasma electrolysis method with variations in voltage (400 - 500 volts) and the type of reagent (methanol and ethanol) on % yield and characteristics of biodiesel. The process is carried out by reacting used cooking oil with a reagent that is given a voltage until an electric discharge occurs and two layers are formed and the calculation of the specific energy requirements for the synthesis process is carried out. The results show that at a voltage of 500 volts with methanol reagent produces a yield of 85.73% with characteristics according to the SNI 7128:2015 standard such as density 888.36 Kg/m3, viscosity 5.79 Cst, acid number 0.39 mg - KOH/g, content ester 97.56% and flash point 117oC with the exception of water content 0.373%, with a specific energy requirement of 1758,031 J/mL.
Optimasi Frekuensi dan Kuat Medan Elektromagnetik dalam Simulator Anti- Scaling CaCO3 Berbasis Induksi Elektromagnetik Nurcahyo Nurcahyo; Shoerya Shoelarta; Joko Suryadi; Akmal Rizky Asy-syawal Zaelani; Azmi Wibisono; Mufti Al Fath Munawar; Wondo Aris Nurwanto
Jurnal Teknologi Vol 26, No 2 (2026): Agustus 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i2.9845

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Continuous Adsorption of and Cr (VI) Using a KOH-activated Corn Cob Carbon-Coal Fly Ash Composite Rony Sihombing; Alfiana Adhitasari; Shoerya Shoelarta; Tifa Paramitha; Ghaniari Putri; Khumaira Maulani Wijaya
Sainteknol : Jurnal Sains dan Teknologi Vol. 24 No. 2 (2026): December 2026 (In Press)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v24i2.63139

Abstract

Industrial wastewater containing divalent cadmium (Cd₂⁺) and hexavalent chromium (Cr (VI)) poses a serious environmental threat because of the toxicity, persistence, and bioaccumulative nature of these heavy metals. This study aimed to evaluate the performance of a composite adsorbent, prepared from KOH-activated corn cob carbon (CCAC) and calcined coal fly ash (FA) at a mass ratio of 5:1, for the continuous adsorption of Cd₂⁺ and Cr (VI). The adsorbent was characterized using Fourier Transform Infrared (FTIR) spectroscopy, while continuous adsorption experiments were performed in an up-flow acrylic column at an initial metal concentration of 100 mg/L, evaluating the effect of flow rate (5–25 mL/min) on Cd₂⁺ removal and comparing it with Cr (VI) removal from real industrial wastewater at 5 mL/min. FTIR analysis confirmed that KOH activation and calcination modified the surface functional groups of the CCAC and FA, respectively, increasing the availability of oxygen-containing active sites. The composite adsorbent achieved a high and consistent Cd₂⁺ removal efficiency of 91.13–91.51%, with an adsorption capacity of 4.18–4.19 mg/g, across all tested flow rates. In contrast, Cr (VI) removal was very low (0.797%), attributed to electrostatic repulsion between the anionic Cr (VI) species and the negatively charged adsorbent surface at near-neutral pH, as well as competition from co-existing ions in the real wastewater matrix. These findings indicate that the FA/CCAC composite is a promising, low-cost, waste-derived adsorbent for continuous Cd₂⁺ removal, while further surface modification or pH adjustment is required to enhance its performance for Cr (VI) removal.
Co-Authors Akmal Rizky Asy-syawal Zaelani Alfiana Adhitasari Azmi Wibisono Elizabeth, Lidya Ghaniari Putri Hidayatulloh, Irwan Khumaira Maulani Wijaya Moch Adli Darojat Mufti Al Fath Munawar Nurcahyo Nurcahyo Paramitha, Tifa Rahmat Dani Dwi Fedianto rony sihombing Saripudin Sudrajat Harris Abdulloh Suryadi, Joko Wondo Aris Nurwanto