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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 133 Documents
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Kinetics Study in Essential Oil Extraction from Basil Leaves by Microwave Assisted Hydrodistillation Putri, Ditta Kharisma Yolanda; Udroto, Firsta Retnaningtyas; Fatimah, Dianavita; Fachri, Boy Arief; Rahmawati, Istiqomah; Mumtazah, Zuhriah; Palupi, Bekti; Al Fajri, Maktum Muharja
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i1.4930

Abstract

Essential oil is compounds that contained in plants and have many benefits. Basil is an aromatic plant that can produce essential oils. Essential oils can be extracted from basil leaves using Microwave Assisted Hydrodistillation (MAHD) method. To determine the efficiency of the MAHD method, it’s necessary to study the kinetics of the extraction method. It’s because kinetic studies can be used to identify the optimal point in the process where the highest efficiency is obtained, so the extraction process can be optimized. The aim of this research is to evaluate the suitable kinetic model for the basil leaf extraction process using the MAHD method. This extraction using 100 grams of basil leaves and 200mL aquadest, heated at various microwave power 150W, 300W, and 450W. The extractions were carried out for 70 minutes with 10 min intervals. The results showed that the largest oil yield was obtained when using 450W power, which was 0.190 grams. Based on the experimental data obtained, the most suitable kinetic model is second-order model. This can be analyzed from the highest R2 (0.9946 – 0.9999) and the lowest RMSE (0.0062 – 0.0349). Increasing the irradiation power will affect the extraction rate and parameter values of each kinetic model.
Redesigning the Coagulation Process for Treating Water Produced from Petroleum Drilling in Water Treatment Injection Plants Muharja, Maktum; Darmayanti, Rizki Fitria; Sonomoto, Kenji
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i1.5156

Abstract

This study aims to optimize the coagulation process for treating wastewater produced from petroleum drilling. The research includes redesigning the flocculator to enhance the coagulation process. The initial quality of the wastewater, characterized by parameters such as turbidity and Total Suspended Solids (TSS), did not meet the environmental quality standards stipulated by the Indonesian government. Poly Aluminum Chloride (PAC) coagulant and Polyacrylic Acid (PAA) flocculant were utilized at varying doses of 10–150 ppm and 0.25–25 ppm, respectively. The study identified the key challenges in the current coagulation and flocculation processes, including inefficiencies in pollutant removal and high operational costs. Optimal doses of 10 ppm for coagulants and 0.25 ppm for flocculants were determined, resulting in daily operational cost savings of IDR 15,865,030. The economic analysis was conducted to project the potential cost savings based on the optimized dosages, indicating a reduction in chemical costs and operational expenses. Moreover, the optimal injection distance for PAA flocculant was found to be approximately 3.5 meters from the static mixer. A new design for the flocculator was proposed, incorporating these findings to improve the overall treatment efficiency. The redesigned flocculator prototype features a 6-meter-long horizontal tube, 1.5 meters in diameter, with 15 partitions spaced 40 cm apart, and a water level difference between the inlet and outlet of around 0.67 cm. These findings suggest that coagulation redesign and optimization, along with clarifier engineering, can significantly reduce operational costs and enhance water quality for injection into the earth.
Utilization of Red Dragon Fruit (Hylocereus polyrhizus) Peel Waste as an Alternative Indicator for Acid - Base Titration Azkiya, Noor Isnaini; Sukmawanta, Shafara Najla Marinda; Lusiani, Cucuk Evi
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i1.6169

Abstract

Titration indicators are organic (generally) or inorganic compounds used in titrations to determine and indicate the end point of a titration. Indicators that are widely used in acid-base titrations are synthetic indicators such as phenolphthalein (PP), methyl red (MM), methyl orange (MO), and phenol red (MF). Apart from being relatively expensive, the use of these indicators also produces chemical waste which can pollute the environment. The solution to overcome this problem is to utilize natural ingredients as a substitute for synthetic indicators. The natural indicator used in this research was the peel of red dragon fruit (Hylocereus polyrhizus). Red dragon fruit peel contains flavonoid compounds, one of which is anthocyanin. Anthocyanins are polar so they can be dissolved in polar solvents such as ethanol. This research aims to determine the effect of the type of solvent and length of maceration time in anthocyanin extraction as an indicator for strong acid-strong base titration, and to determine the effect of storage time on the stability of red dragon fruit peel extract. In the maceration process, a variable ratio of solvent to red dragon fruit peel was used 1:5 (w/v). The solvents used were ethanol, methanol, and acetone acidified with 5 mL of HCl 1% (v/v). Identification of anthocyanin compounds was carried out using FT-IR and UV-Vis. In this study, the highest anthocyanin content was found in the acetone solvent 9x10-4 mg/100 g and the lowest was in the methanol solvent at 6x10-4 mg/100 g. Furthermore, the most similar application to a commercial titration indicator is the use of methanol and acetone solvents with a 24-hour extraction time.
Optimization of Operating Conditions in Lignin Isolation Process of Rice Straw Using Box-Behnken Design Methodology Anggerta, Lintang Alivia; Dewi, Listiyana Candra
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i1.6886

Abstract

Exposure to sunlight causes ultraviolet (UV) radiation, which can damage the body cells. Those negative effects can be prevented by using sunscreen, which contains lignin. Lignin has been proven to absorb or reflect      UV radiation effectively. Rice straw was being used as a non-synthetic active ingredient in sunscreen production. This research shows that during the operating conditions of the isolation process, several variables affect yield production, such as the mass of rice straw, temperature and time of isolation. Therefore, this research was carried out to optimize the lignin isolation process using the Box-Behnken Design (BBD) methodology.  Rice straw dregs that have undergone sample preparation were subsequently isolated through hydrolysis using 5% (w/v) NaOH. After that, the product was carried out to the next process, namely acidification, which used 72% (v/v) H2SO4. The resulting precipitate was then filtered and dried in an oven. Subsequently, the fiber content of the product was analyzed using the Van Soest analysis method, while the process conditions were evaluated using the BBD methodology. In this research, the highest lignin yield obtained was 17.04%, and the optimal process conditions used were 30 g mass of straw, 140°C, and 3 hours reaction time.
Precipitation Method for LTA Zeolite Synthesis and Structural Characterization Andita, Jessica Shierly; Putri, Amalia Eka; Siswati, Nana Dyah; Suprihatin, Suprihatin; Nurcholis, Fachrul
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The demand for large-scale industrial applications of zeolite has driven the development of synthetic zeolite as an alternative to natural zeolite, which is limited by availability and production constraints. This study investigates the synthesis of LTA (Linde Type A) zeolite using a precipitation method, focusing on the effects of stirring time and aging time on zeolite yield and crystallinity. The synthesis process involved preparing sodium aluminate and sodium silicate solutions, followed by controlled crystallization at 80°C for 8h. The resulting zeolite was analyzed using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) to determine its phase purity, morphology, and Si/Al ratio. The results showed that optimal zeolite yield (24.75%) was obtained with 3h of stirring and 24h of aging. SEM analysis confirmed the cubic morphology characteristic of LTA zeolite, while EDS analysis determined an Si/Al ratio of 1.44, classifying the product as LTA zeolite. These findings highlight the significance of controlled stirring and aging conditions in optimizing zeolite synthesis for industrial applications.
Adsorption Kinetics and Process Parameter Effects on Oil Uptake by Tamarind Fruit-Shell Activated Carbon Ernawati, Lusi; Anifah, Eka Masrifatus; Musyarofah, Musyarofah; Reza, Mutia; Waluyo, Joko; Sapawe, Norzahir
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.v9i2.7596

Abstract

Oil contamination presents a major challenge to wastewater treatment systems due to its detrimental effects. This research explores the effectiveness of activated carbon derived from tamarind fruit shells as an adsorbent for removing oil from wastewater. The activated carbon was prepared using three different chemical agents: phosphoric acid, zinc chloride, and sodium hydroxide. Characterization of the resulting carbon materials was performed using XRD, FTIR, SEM, and BET analysis. Batch adsorption experiments were conducted to evaluate the influence of initial oil concentration, adsorbent dosage, contact time, temperature, and pH. The BET specific surface area, pore size and total pore volume for the optimum adsorption capacity of activated carbon using H3PO4 are obtained at 617.59 m2.g-1, 37.14 cm3.g-1 and 0.812 g.g-1, respectively. Optimal adsorption occurred at an oil concentration of 5000 mg.L-1, a dosage of 1 g.L-1, a contact time of 60 minutes, a temperature of 60°C, and neutral pH (7). Across all activating agents, the Langmuir isotherm best described the adsorption equilibrium, while adsorption kinetics followed the pseudo-second-order model. Among the samples, activated carbon treated with H3PO4 demonstrated the highest adsorption capacity (1070 mg.g-1), followed by ZnCl2 (879 mg.g-1), and NaOH (643 mg.g-1). These results indicate that tamarind shell-derived activated carbon is a cost-effective and efficient solution for oil removal in wastewater treatment applications.
Comparative Study of Biomethane Purification Process using Analytical Hierarchy Process Putri, Theodora Mega; Simanjuntak, Berlian; Rumahorbo, Eyunike; Panggabean, Kristy
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.v9i2.7428

Abstract

The selection of purification technology for upgrading biogas to biomethane involves complex considerations, as each technology -such as pressure swing adsorption (PSA), membrane separation (MS), or chemical absorption (CA) - offers distinct advantages and disadvantages. The Analytical Hierarchy Process (AHP), provides a systematic framework to simplify and resolve such complexities. This research aims to apply AHP to critically compare purification technologies for biomethane. AHP method is implemented in four steps which includes determination of AHP structure (goal, criteria, sub-criteria and alternatives), formation of pairwise comparison matrices based on literature study and expert opinion, normalization and consistency calculation, and prioritization of alternatives. The criteria considered in AHP analysis of this study are technology capacity, cost, and environmental impact. Overall, PSA received the highest weight for state of technology. In terms of separation performance, CA achieved the highest scores for methane purity and methane retention. From a cost and environmental impact perspective, MS performed best.  However, despite its advantages, MS application is limited by its relatively lower maturity and limited scalability.  By evaluating alternatives based on AHP framework, PSA was identified as the top-priority option, with total weight score of 0.426, followed by MS with total weight score of 0.387 and CA with total weight score of 0.181. This study has successfully demonstrate the application of AHP to select purification technologies for converting biogas to biomethane.
Characterization of Bio-Oil and Bio-Asphalt Produced Through Catalytic Pyrolysis of Different Biomass Feedstocks Dewajani, Heny; Irfin, Zakijah; Iswara, M. Agung Indra; Ramadhana, Rucita; Wahyudi, Moch. Ikhsan; Riris, Farikhatul Iza
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.v9i2.7610

Abstract

Asphalt is an aggregate binder in road pavement construction derived from the residue of the petroleum fractionation process, a non-renewable natural resource. Reliance on petroleum asphalt leads to resource scarcity and increased production costs. One alternative to reduce this dependence is the use of bio-asphalt substitutes, which utilize renewable natural resources derived from biomass. The abundance of biomass such as coconut shells, sawdust, and coffee husk in East Java, Indonesia, makes it a promising resource for bio-asphalt synthesis. This study analyzes the effect of biomass types and catalyst mass ratios on the characteristics of bio-asphalt from bio-oil pyrolysis and its mixture with petroleum asphalt, specifically the penetration (pen) 60/70. The research stages include biomass preparation, zeolite catalyst activation, biomass pyrolysis into bio-oil, evaporation into bio-asphalt, and mixture analysis. Optimal characteristics were achieved using a 6% w/w coconut shell biomass catalyst, resulting in a bio-oil yield of 47.27% and a density of 1.060 g/mL. The bio-asphalt yield was 3.41% when mixed with petroleum asphalt pen 60/70. The bio-asphalt exhibited a penetration value of 66.35, a softening point of 52°C, and a density of 1.042 g/cm³, in accordance with the Indonesian National Standard (SNI) 8135:2015.
PID-Controlled Pyrolysis of Medical Mask Waste for Enhanced Alternative Fuel Production Lusiani, Cucuk Evi; Dewi, Ernia Novika; Hardjono, Hardjono; Naryono, Eko; Febriani, Nahdiyah Nur; Nurlaila, Istiqomah Hanifa
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.v9i2.8685

Abstract

The escalating volume of plastic-based medical mask waste, exacerbated by the COVID-19 pandemic, presents an urgent environmental challenge that can be addressed through sustainable valorization. This study proposes a novel, integrated approach by evaluating the effectiveness of a Proportional-Integral-Derivative (PID) temperature control system to minimize thermal fluctuations critical for consistent product selectivity of the pyrolysis process. A rigorous comparative evaluation of the Cohen-Coon (CC) and Internal Model Control (IMC) tuning methods demonstrated IMC's superiority, achieving a significantly shorter settling time of 114 minutes and a low overshoot of 0.45, ensuring stable isothermal operation. Pyrolysis process conducted under this optimized control condition (at 250°C for 5 hours) resulted in high liquid fuel yields and improved physical characteristics (density 785.8 kg/m3, viscosity 1.546 cSt). Gas Chromatography-Flame Ionization Detector (GC-FID) confirmed that the liquid fuel exhibits hydrocarbon fractions highly similar to commercial kerosene and diesel. These findings underscore that the precision of the IMC-PID method is the key technical enabler for enhancing both process stability and the subsequent quality and yield of valuable liquid fuel derived from medical mask waste.
Enhancing Dye-Sensitized Solar Cell Efficiency Using Photosynthetic Pigments from Navicula sp. TAD Telussa, Ivonne; Maahury, Mirella Fonda; Lilipaly, Eka Rahmat Mahayani Anthonia Putera; Latuihamallo, Threbelin Anacovic Lawdrian
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.v9i2.7179

Abstract

Microalgae Navicula sp. TAD is a microscopic plant that has the potential to serve as an alternative source of pigments, requiring relatively short cultivation time, making it suitable for use as a sensitizer in dye-sensitized solar cells. This research aimed to isolate, characterize, and identify the photosynthetic pigments of Navicula sp. TAD, and subsequently test its photoelectric capability as a sensitizer material in solar cells. The study involved cultivating Navicula sp. TAD cells to obtain biomass, isolating pigments from dry biomass, purifying pigments using column chromatography techniques, characterizing pigments by scanning visible light absorption patterns, and fabricating solar cells with TiO2 paste, followed by testing the photoelectric capabilities of the solar cells. From the research, pigments such as β-carotene, chlorophyll a, xanthophyll, and chlorophyll c were obtained, with chlorophyll a and carotenoid contents of 29.9698 μg/mL and 18.4255 μg/mL, respectively. Solar cells sensitized with photosynthetic pigments showed the best photoelectric performance with crude pigment extract at a concentration of 30×10³ ppm, yielding Short-circuit current density (ISC) 1.93×10⁻⁵ A;  open-circuit voltage (VOC) 0.0465 V; fill factor (FF).58; and efficiency (η) 8.33×10⁻² %. Meanwhile, variations in pigment concentration of chlorophyll and xanthophyll at a ratio of 0:100 yielded ISC 9.96×10⁻⁵ A; VOC 0.1004 V; FF 0.45; and η 7.24×10⁻¹ %.

Page 13 of 14 | Total Record : 133

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