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All Journal Konversi Jurnal Teknik Kimia dan Lingkungan
Isnaini, Muhammad Dody
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Materials Science & Nanotechnology

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Catalytic co-pyrolysis of coal and polypropylene plastic into liquid fuel Sunarno, Sunarno; Reni Yenti, Silvia; Mutamima, Anisa; Huwaidah Husna, Fathiyah; Rahmat Wicakso, Doni; Isnaini, Muhammad Dody
Konversi Vol 13, No 1 (2024): April 2024
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v13i1.16043

Abstract

The decline in fossil fuel sources has stimulated research in the field of renewable fuels. Efforts are currently being made to find alternative energy sources that have high efficiency and are environmentally friendly. By looking at the existing problems, research on the co-pyrolysis of coal and polypropylene (PP) plastic into liquid fuel is interesting to do. The co-pyrolysis process was carried out at 400oC and nitrogen gas was flowed with a flow rate of 100 mL/min for 60 minutes with various ratio of raw material coal/PP plastic (100/0, 75/25, 50/50, 25/75), and ratio of CaO catalyst/raw material (0%, 10%, 15%, 20% w/w). The results showed that with the reduction in the ratio of coal/plastic, the yield of liquid fuel increased. Co-pyrolysis of coal: PP plastic with a ratio of 25:75 with the addition of 20% CaO catalyst obtained 37.56% liquid fuel yield with the characteristics of density of 0.839 g/mL, viscosity of 2.51 cSt, calorific value of 46.813 MJ/kg and pH of 2.9.
Synthesis of Functional Groups on Surface-Modified Activated Carbon for Nitrate Removal from Tofu Home Industry Wastewater Aprilla, Dini; Sari, Indah Permata; Irawan, Chairul; Tuhuloula, Abubakar; Nata, Iryanti Fatyasari; Ariani, Ariani; Isnaini, Muhammad Dody
Jurnal Teknik Kimia dan Lingkungan Vol. 10 No. 1 (2026): April 2026
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v10i1.7872

Abstract

This research successfully converted spent coffee grounds (SCG) into powdered activated carbon (AC) through carbonization at 400°C. The surface functional groups of this carbon were subsequently modified using hydrochloric acid as an activating agent to enhance its adsorption properties. The purpose of this research was to evaluate the performance of this modified activated carbon (MAC) as an adsorbent for reducing nitrate content in tofu industry wastewater, which is characterized by high concentrations of nitrate ions. The MAC was characterized using SEM and FTIR analysis to determine its surface morphology and functional groups, which are critical for adsorption process of capturing atoms, ions, and molecules on a materials surface. The batch adsorption experiments using AC and MAC as adsorbent were then performed for reducing nitrate content in tofu industry wastewater. Batch adsorption experiments were conducted under optimal conditions: a pH of 7±0.2, room temperature, a stirring rate of 150 rpm, and an adsorbent dose of 1 g/L. The results demonstrated a significant decrease in nitrate concentration from 28.6 mg/L to 1.2 mg/L, achieving a 95.80% removal efficiency at an equilibrium contact time of 180 minutes. The performance of the MAC was comparable to, and even more favorable than, that of unmodified activated carbon (UAC) used as a control that only achieved 58.74% percentage removal of nitrate. This remarkable nitrate removal efficiency is attributed to the distinct morphology and enhanced surface properties imparted by the hydrochloric acid modification. Therefore, modified activated carbon from coffee grounds shows high potential as an effective adsorbent for wastewater treatment.
Co-Authors Abubakar Tuhuloula Aprilla, Dini Ariani Ariani Chairul Irawan Huwaidah Husna, Fathiyah Indah Permata Sari Iryanti Fatyasari Nata, Iryanti Fatyasari Mutamima, Anisa Rahmat Wicakso, Doni Reni Yenti, Silvia Sunarno Sunarno