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Agung Ari Wibowo
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INDONESIA
Jurnal Teknik Kimia dan Lingkungan
Published by Politeknik Negeri Malang
ISSN : 25798537     EISSN : 25799746     DOI : http://dx.doi.org/10.33795/jtkl
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Materials Science & Nanotechnology
JTKL editors welcome manuscripts in the form of research articles, literature review, or case reports that have not been accepted for publication or even published in other scientific journals. Articles published in cover key areas in the development of chemical and environmental engineering sciences, such as: Energy Waste treatment Unit operation Thermodynamic Process simulation Development and application of new material Chemical engineering reaction Biochemical Biomass Corrosion technology The "JURNAL TEKNIK KIMIA DAN LINGKUNGAN" journal is a peer-reviewed Open Access scientific journal published by Politeknik Negeri Malang. This journal first appeared in October 2017. The main purpose of the journal was to support publication of the results of scientific and research activities in the field of Chemical and Environmental Engineering. It is published twice a year in April and October.
Arjuna Subject : Teknik Kimia (semua kategori) - Kimia Proses dan Teknologi
Articles 142 Documents
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Kinetic Study of Co-pyrolysis of Kelakai (Stenochlaena palustris) and Low-rank Coal (Lignite) Fadhillah, Hilda Nur; Wijayanti, Hesti; Mardina, Primata; Juwita, Rinna; Nata, Iryanti Fatyasari; Putra, Meilana Dharma; Madani, Zikri Daffa Aulia; Hendrawan, Rangga Dwi
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7195

Abstract

Recently, fossil fuels have still become a main source of energy and chemicals. Biomass conversion has become a promising technology to convert biomass into bio-energy and bio-chemicals. Kelakai, as a potential biomass, is abundant in wetland areas such as Kalimantan (Indonesia) and many other Asian regions, so that low-rank coal (lignite). Co-pyrolysis, the combined pyrolysis of biomass and lignite, is an attractive technique considering to its potential to enhance the efficiency of pyrolysis products. In this study, the thermal decomposition behavior and kinetic of co-pyrolysis of kelakai and lignite at various mass ratio composition (1:0, 3:1, 1:1, 1:3, and 0:1) were investigated. The experiments were performed on a thermogravimetric analyzer (TGA). The TGA result indicated that the kelakai highly decomposed at 257-400℃, while lignite was 286-500℃. Their blends were in between. In addition, thermogravimetric data were subsequently applied to a kinetic analysis based on the Arrhenius equation, with a first-order reaction. The kinetic analysis results, including activation energy and pre-exponential factor, were determined for the kelakai and lignite mixture were found to be in the range of 10.22-10.98 kJ/mol and 0.0651-0.1351 min-1, respectively. Knowledge of thermal decomposition characteristics of kelakai and its kinetics is essential for optimizing pyrolysis design. The co-pyrolysis kelakai and lignite resulted in the highest bio-oil yield of  26.86 wt% at the ratio of  0:1 and the lowest yield of 12.51 wt% for the ratio of 1:0, when using mixed ratios of kelakai and lignite, the highest yield was 24.60% (1:3) and the lowest yield was 21.18 wt% (1:1).
Optimization of Biodiesel Production from Sunflower Oil Using Sodalite-Based Catalyst via Taguchi Method Hamid, Abdul; Jakfar, Amin; Rahmawati, Zeni; Armansyah, Muhammad Doni; Wahyuni, Tri; Purbaningtias, Tri Esti; Febriana, Ike Dayi; Abdullah, Mohammad; Ilmah, Aurista Miftahatul; Rohmah, Faizatur
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7345

Abstract

The growing demand for alternative fuels has highlighted biodiesel as sustainable substitute for fossil diesel. In this study, biodiesel was produced from sunflower seed oil using heterogeneous catalyst synthesized from natural kaolin into sodalite via hydrothermal process. The synthesized catalyst was characterized using XRD, FTIR and SEM-EDS, confirming the transformation of kaolinite to sodalite. The transesterification reaction was conducted under varying methanol-to-oil molar ratios (1:12, 1:18, and 1:24) and temperatures (60, 65, and 70°C). A Taguchi orthogonal array (L9) was employed to statistically evaluate the effects of these parameters on methyl ester yield. Experimental results showed that both methanol ratio and reaction temperature significantly influenced biodiesel yield, with the highest yield of 90.44% obtained at 70°C and 1:18 molar ratio. Signal-to-noise ratio and ANOVA analysis indicated that the methanol-to-oil ratio was the most dominant factor (46.05%) compared to temperature (40.55%). The resulting biodiesel exhibited a flash point of 158°C, acid value of 0.06 mg-KOH/g, and iodine value of 84.06 g-I₂/100g, satisfying most ASTM D6751 and SNI 7182:2015 standards, though viscosity and density exceeded standard limits. Emission testing showed 16% reduction in CO emissions with increasing biodiesel blends, while NO and NOx emissions slightly increased.
Innovation and Characterization of Zeolite from Matoa Fruit for Adsorption of Heavy Metals Cu(II) Rahman, Ainul Alim; Fadlil, Firmanullah; Tuheteru, Hajirum; Halijah, Siti
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7390

Abstract

Matoa fruit is abundant in Papua and has not been optimally utilised. Matoa fruit consists of ash approximately 3.74%. The high ash and silica content make it highly suitable as a raw material for zeolite production. Zeolite can be used as a zeolite material to adsorb heavy metal Cu(II). Heavy metal pollution continues to increase with industrial growth. Heavy metals can harm human health. Innovation must continue addressing heavy metal pollution, such as Cu(II), to produce more efficient, cost-effective, and environmentally friendly technologies. This study aims to determine the ability of matoa fruit zeolite to adsorb heavy metal Cu(II). The characterization of zeolite was done using XRD (X-Ray Diffraction) and SEM (Scanning Electron Microscope). The synthesis process involved preparing sodium aluminate and sodium silicate solutions, followed by controlled crystallisation at 105°C for 24 hours. The zeolites were tested for adsorption with the independent variable being zeolite mass, while the dependent variables were contact time of 48 hours and stirring time of 4 hours. SEM analysis confirmed the cubic morphological characteristics of matoa fruit zeolite, classifying the product as matoa fruit zeolite. The main findings of the study showed that matoa fruit zeolite can reduce Cu metal levels in sewage-polluted water with 88.85% adsorption at 0.5 g in 50 ml of test solution.
Optimization of Agitation Speed and Aeration Rate for Fungal Protein Production from Tofu Whey Using Aspergillus oryzae in a Stirred Tank Bioreactor Keryanti, Keryanti; Manfaati, Rintis; Fauzan, Rizky; Ramadhani, Fauziah; Krista, Gustin Mustika; Ferawati, Yohana Fransiska; Santoso, Budi
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.v10i1.7813

Abstract

Fungal protein, derived from microbial biomass, offers a sustainable protein source and can be produced through fermentation. However, the utilization of tofu whey, an abundant agro-industrial by-product in Indonesia, as a substrate for fungal protein remains underexplored. This study optimizing both agitation speed and aeration rate for Aspergillus oryzae fermentation in a stirred-tank bioreactor. Fermentation was conducted in a 5 L stirred-tank bioreactor with a 3 L working volume for 48 hours at an initial pH of 5 and a temperature of 35℃. Agitation speeds of 150, 200, 250, and 300 rpm were tested at a constant aeration rate of 1.0 vvm to determine the optimum mixing condition. The agitation speed that yielded the highest dry cell weight was then used as the basis for further aeration experiments (0, 0.5, 1.0, and 1.5 vvm). The optimum conditions were obtained at 150 rpm and 1.0 vvm, resulting in a dry cell weight of 7.1 g/L and a protein content of 6.83% (w/w). These findings demonstrate the potential of valorizing tofu whey into fungal protein while highlighting the need for further multi-parameter optimization to enhance protein levels toward single-cell protein standards.
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.
Hybrid Composite of Biomass-Derived Activated Carbon and Mg/Al Hydrotalcite for Caffeine Adsorption from Aqueous Solutions Nofiyanti, Estin; Ghofur, Noer Laelly Barorroh Taufik Abdul; Utami, Dian
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.v10i1.8795

Abstract

This study investigated the adsorption performance of activated carbon (AC) derived from jengkol (Pithecellobium jiringa) peel and its composites with Mg/Al hydrotalcite (HT) for caffeine removal from aqueous solutions. The adsorbents were characterized using FTIR, XRD, and SEM-EDX, confirming the presence of –OH groups, M–O–M bonding, and layered porous morphology. Batch adsorption experiments evaluated the effects of contact time, pH, and initial concentration. AC showed the highest removal efficiency (96.44% at 3 ppm), while ACHT 12 demonstrated stable performance at moderate concentrations and fit well to the Langmuir isotherm (R2 = 0.9609) and pseudo-second-order kinetics (R2 = 0.9912). ACHT 21 followed the Freundlich model (R2 = 0.7758), indicating heterogeneous multilayer adsorption. Optimal adsorption occurred in acidic conditions (pH 3–5), which reflects the characteristics of pharmaceutical wastewater. The results confirm the potential of jengkol-based adsorbents as low-cost, sustainable alternatives for caffeine-contaminated water treatment.
Biogas Generation from Liquid Waste of Tapioca Starch Processing via a Single Stage of Anaerobic Digestion and Microbial Electrolysis Cell: The Effect of Trace Element Iron Addition Prabowo, Bianca Amartya; Syaichurrozi, Iqbal; Ibrahim, Achmad Faizal; Tsaqif , Farhan Fadlurohman; Satria, Muhamad Ariel; Fachriza, Muhammad Doni; Pitaloka, Alia Badra
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.v10i1.8807

Abstract

The industries of tapioca starch processing result in a substantial amount of liquid waste (TSPW), characterized by high concentrations of organic compounds. Because of its chemical oxygen demand (COD), the tapioca wastewater is not permitted to be thrown away directly into the surrounding. The new method of combination of anaerobic digestion (AD) and microbial electrolysis cell (MEC) is proposed to be applied to convert COD in the tapioca wastewater to biogas. The main objective of this study is to examine the impact of FeCl3 addition on MEC-AD performance in converting tapioca wastewater to biogas. The FeCl3 dose varied to 0 (control), 200, 400, 600, and 800 mg/L. The results revealed that FeCl3 doses of 0, 200, 400, 600, and 800 mg/L generated total biogas yields of 197.1, 276.11, 261.2, 239.48, and 202.2 mL/g-CODadded, respectively. Then, the FeCl3 doses of 0, 200, 400, 600, and 800 mg/L achieved COD removals of 62, 71, 66, 65, and 63%, respectively. Furthermore, the FeCl3 doses of 0, 200, 400, 600, and 800 mg/L had total solid (TS) removals of 33, 51, 48, 35, and 27%, respectively. Hence, the optimal FeCl3 dose in MEC-AD of tapioca wastewater is 200 mg/L. Through the modified Gompertz model, the FeCl3 dose of 200 mg/L had the highest  value (275.94 mL/g-CODadded) and the highest  value (186.61 mL/g-CODadded/day).
Xylanase Production by Aspergillus niger Using Agro-Industrial Residues and Tween Surfactants: A Non-Parametric Analysis Hakim, Arif Rahman; Azkiya, Noor Isnaini; Ningsih, Wahyuni; Mufid, Mufid; Wardani, Arum Kusuma; Al Mukharromah, Nisa’ Ulana
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.v10i1.8854

Abstract

Xylanase plays a key role in hydrolyzing xylan, yet large-scale enzyme production remains limited by the high cost of purified xylan substrates. Although lignocellulosic agricultural residues offer a promising low-cost alternative, their effectiveness as substrates for Aspergillus niger and the influence of process additives on enzyme performance are not fully understood. This study addresses this gap by evaluating sugarcane bagasse and palm kernel cake as economical substrates and examining how substrate type, substrate concentration, and surfactant selection affect xylanase specific activity. Fermentation experiments were conducted using substrate concentrations of 1.5–3.0% (w/v) supplemented with Tween 20, Tween 60, or Tween 80, followed by statistical analysis using the Kruskal–Wallis test and Bonferroni-corrected Mann–Whitney U tests. Substrate concentration (p = 0.016) and surfactant type (p < 0.001) significantly influenced specific activity, whereas substrate type did not (p = 0.224). The highest activity (4.380 ± 0.052 IU/mg; median = 1.9113) was achieved using 3.0% palm kernel cake with Tween 20. These findings demonstrate that optimizing substrate load and surfactant choice is crucial for enhancing xylanase production from low-cost agro-industrial residues, providing practical insights for cost-efficient enzyme bioprocess development.
Isotherm and Kinetic Adsorption of Nitrogen–Doped Carbon for Remazol Brilliant Blue R Dye Susanto, Susanto; Priadi, Handoko Desta; Muhammad, Mahhathir; Jalaluddin, Agus; Prasdiantika, Ricka
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.v10i1.8871

Abstract

Industrial textile effluents containing Remazol Brilliant Blue R (RBBR) represent a significant environmental challenge due to their persistent nature and resistance to conventional biological treatment methods. This research explores the development of nitrogen-enriched carbon materials derived from palm oil empty fruit bunch (PEFB) cellulose as an effective adsorbent for RBBR elimination from contaminated water systems. The synthesized material was produced through thermal treatment at 700°C, enabling the formation of pyridinic nitrogen groups that improve surface alkalinity and create electron-rich active sites. Material characterization employed XRD, FTIR, and SEM-EDS techniques to evaluate structural and chemical properties. Laboratory-scale adsorption studies examined the influence of starting dye concentrations (100-500 mg/L) and reaction duration (10-120 minutes). Results demonstrated optimal fitting with the Freundlich isotherm model (qₘ = 434.78 mg/g) and pseudo-second-order kinetics, suggesting heterogeneous multilayer adsorption dominated by chemical bonding mechanisms. The proposed interaction mechanism involves electrostatic attraction between RBBR sulfonate functionalities and protonated pyridinic nitrogen sites under pH 6 conditions.
Modification of Rice Straw Cellulose with Acrylamide using Ammonium Persulfate Initiator by Microwave Assisted Distantina, Sperisa; Citra, Insan Idealina; Putri, Putu Amelia Indira; Mujtahid, Kaavessina
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.v10i1.9125

Abstract

In this study, rice straw powder was grafted with acrylamide (AA) using amonium persulfate (APS) as an initiator to obtaine rice straw cellulose-graft-polyacrylamide (RS-g-PAA). The resulting RS-g-PAA was then mixed with carrageenan to form bead gel. This research aimed to determine the influence of the amount of acrylamide and ammonium persulfate as an initiator on the swelling capacity of bead gels. The mixture of 1 g of rice straw cellulose, AA (5, 10, 15 g), APS (0.05, 0.10, 0.15 g), and 50 mL aquadest was irradiated using microwave at 540 W for 30 s with cooling cycles. The aqueous mixture of RS-g-PAA and carrageenan was injected into palm oil layer and then crosslinked using KCl and CaCl₂. The results of FTIR show that the successful grafting by the appearance of amide groups in the RS-g-PAA structure. The bead gel with 15 g AA showed the highest swelling capacity of 1806.12% in aquadest and 1611.58% in urine solution. Bead gels from APS of 0.10 g produced the highest swelling capacity of 1218.15% in aquadest and 975.20% in urine solution. Therefore, the bead gels based on RS-g-PAA and carrageenan demonstrate strong potential as an environmentally friendly superabsorbent polymers.

Page 14 of 15 | Total Record : 142

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