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Resti Nurmala Dewi
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Jurusan Teknik Kimia Universitas Syiah Kuala, Jl. Tgk. Syech Abdur Rauf No.7, Kopelma Darussalam, Banda Aceh, INDONESIA
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JURNAL REKAYASA KIMIA & LINGKUNGAN
Published by Universitas Syiah Kuala
ISSN : 14125064     EISSN : 23561661     DOI : https://doi.org/10.23955/rkl.v18i2.34018
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Engineering
The Journal of Chemical Engineering and Environment is an open access journal that publishes papers on chemical engineering and environmental engineering. The following topics are included in these sciences: Food and biochemical engineering Catalytic reaction engineering Clean energy technology Environmental and safety technology Fundamentals of chemical engineering and applied industrial engineering Industrial chemical engineering Material science engineering Process and control engineering Polymer and petrochemical technology Membrane technology Agro-industrial technology Separation and purification technology Environmental modelling Environmental and information sciences Water and waste water treatment and management Material flow analysis Mechanisms of clean development
Arjuna Subject : Teknik Kimia (semua kategori) - Bioengineering
Articles 319 Documents
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Optimization of Acid Degumming of Crude Rice Bran Oil (CRBO) on Phospholipid Removal Using Response Surface Methodology (RSM) Damayanti, Astrilia; megawati, megawati; Winaningsih, Ima; Wicakso, Doni Rahmat; Nuryoto, Nuryoto; Rumbino, Yusuf; Prasetyo, Ridwan Anung; Rizki, Muhammad Prabu
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.43691

Abstract

Rice bran, a byproduct of milling rice, has 60% nutritional content and potential for processing into higher-selling goods like rice bran oil (RBO). Degumming is the first stage of refining crude oil. This research aims to remove phospholipids in crude rice bran oil (CRBO) by optimizing acid degumming. Three variables were optimized in this study using Design Expert v13's response surface methodology (RSM) employing central composite design (CCD) experimental design: the amount of phosphoric acid (0.1, 0.15, and 0.2 %w/w), the degumming temperature (50, 70, and 90 C), and the degumming time (20, 30, 40 minutes). The experimental values and predicted results did not correlate well with percentages (%) of error, with more than 50% occurring in 4 of 19 runs. The model's p-value of 0.4939 ( 0.05) is non-significant, with the coefficient determination, R2 being 0.5026. Optimization with desirability value ( 0.5) results showed a phospholipid removal response of 40.479% under conditions of adding 0.1%w/w phosphoric acid, temperature of 83.21 C, and degumming time of 40 minutes, which were determined by Derringers methodology..
Advanced Applications of Pozzolan-Derived Silica: Hydrophobic Agent Synthesis Desfitri, Erda Rahmilaila; Mustikaningtias, Endah; Rizaldi, Fajri Akbar; Sari, Ellyta; Desmiarti, Reni
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.43525

Abstract

The Sumatera Barat province of Indonesia, particularly Padang Pariaman Regency, is rich in pozzolan, a natural resource characterized by high silica (SiO) and alumina (AlO) content. Despite its abundance, pozzolan remains underutilized, primarily used in conventional applications such as cement substitutes and brick production. This study investigates the extraction, purification, and application of pozzolan-derived silica for advanced industrial uses, focusing on synthesising hydrophobic materials. Silica was extracted from pozzolan using alkali and acid treatments, achieving a high-purity cristobalite phase with 93.86% SiO content based on the X-ray diffraction (XRD) and X-ray fluorescence) XRF analysis. The cristobalite phase was combined with polydimethylsiloxane (PDMS) to develop a hydrophobic agent. Hydrophobic performance was evaluated using water contact angle (WCA) measurements, with two coating methodsswab coating and dip-coatingemployed to test the materials. Results revealed that the cristobalite phase achieved the highest hydrophobicity when applied via dip-coating, reaching a WCA 114. Fourier Transform Infrared (FT-IR) analysed the characteristics of a hydrophobic compound. Furthermore, varying PDMS concentrations influenced hydrophobic performance, with 0.4 grams of PDMS yielding the optimal WCA of 105.31 before diminishing returns were observed at higher concentrations due to aggregation effects. This research demonstrates the viability of pozzolan-derived silica as a sustainable and cost-effective raw material for hydrophobic agent synthesis. The findings highlight its potential applications in advanced industries, including water-repellent coatings, glass, ceramics, and catalysts. By advancing the utilization of natural pozzolan resources, this study contributes to sustainable material development and aligns with global efforts to enhance resource efficiency and innovation.
Biosynthesis of Silver Nanoparticles Using Black Pepper (Piper nigrum L.) Essential Oil as a Bioreductor Erliyanti, Nove Kartika; Wira, Guardiola Rosa; Maharani, Hijria Putri; Pujiastuti, Caecilia; Panjaitan, Renova
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.44324

Abstract

The development of environmentally friendly methods for nanoparticle synthesis has gained increasing attention. Black pepper essential oil contains secondary metabolites that act as both reducing and stabilizing agents, making it a promising green alternative in silver nanoparticle (AgNP) synthesis. This study aims to investigate the effect of pH and synthesis time on the yield and characteristics of AgNP synthesized using black pepper essential oil via the sonochemical method. AgNP synthesis was carried out using the sonochemical method by adding black pepper essential oil to a silver nitrate solution. AgNP were synthesized at pH levels of 8, 9, and 10 with reaction times of 30, 60, and 90 minutes. The obtained AgNP were analyzed for yield, UV-Vis absorbance, and particle size distribution. The results demonstrated that yield increased with higher pH and longer synthesis time, reaching a maximum of 58.12% at pH 10 and 90 minutes. UV-Vis analysis confirmed the presence of AgNP with absorption peaks between 400500 nm. The particle size ranged from 9.66 to 348 nm, indicating size variability influenced by synthesis conditions. These findings highlight the potential of black pepper essential oil as a green and sustainable approach for AgNP synthesis, offering eco-friendly benefits for various applications.
Estimation of Critical Properties of Eucalyptol, Alpha-Terpineol, Limonene, and Caryophyllene in Eucalyptus Oil (Melaleuca leucadendra) Using the Group Contribution Method Prasetyo, Muhammad Dewa; Muljani, Srie; Sari, Amilia Putri Puspita
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.42409

Abstract

Critical property estimation of compounds in eucalyptus oil has been conducted using the Group Contribution method to improve the accuracy of calculations of critical temperature (Tc), critical volume (Vc), critical pressure (Pc), and normal boiling point (Tb). This study updates the previous research by adding a comparative analysis of estimation errors between methods. Eucalyptus oil was extracted using microwave hydrodistillation followed by vacuum distillation to determine experimental data, then estimated using the Joback, Constantinou-Gani (CG), Wilson-Japerson (WJ), and Marrero-Pardillo (MP) methods. The results show that the Wilson-Japerson method provides the most accurate Pc estimation with %AAE of 12.7819%, the Marrero-Pardillo method is best for Vc with %AAE of 5.3393%, the Marrero-Pardillo method provides the most accurate Tc estimation with %AAE of 2.7143%. The Joback method is most suitable for Tb with a %AAE of 20.0828%. The application of the results of this study in the essential oil industry is crucial in optimizing the extraction and distillation process, increasing the efficiency of separation units, developing refining technology, and formulating essential oil-based products. The method with the best accuracy can be used in the design of distillation equipment and thermodynamic reactors, thereby improving production efficiency and product quality in the pharmaceutical, cosmetic, and natural chemical industries.
Design of Storage Warehouse with Environmentally Friendly Concept: Case Study of ABC Fuel Terminal Pratama, Ibnu Lukman; Baharrudin, Rafief
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.42258

Abstract

This article presents the design of a storage warehouse at the ABC fuel terminal using an environmentally friendly approach. The concept integrates renewable energy, sustainable building design, ventilation systems, natural lighting, automation, and efficient layout arrangements. A quantitative method is applied to calculate the site area systematically based on field conditions. The total design area is 467.26 m, with dimensions of 30.5 m in length and 15.32 m in width. To minimize environmental impact, the warehouse design incorporates several sustainable features. Solar panels serve as a renewable energy source to reduce reliance on conventional electricity. A transparent polycarbonate roof allows natural daylight to illuminate the interior, reducing the need for artificial lighting during the day. Rotary ventilation systems enhance air circulation, decreasing the dependency on air conditioning and promoting a comfortable working environment. Environmentally friendly Material Handling Equipment (MHE), such as electric or alternative-fuel forklifts, is proposed to lower emissions and energy use. Furthermore, the application of the 3R (Reduce, Reuse, Recycle) principles ensures minimal waste generation, efficient resource usage, and the reuse of viable materials. The warehouse layout adopts a specialized storage system that significantly improves the efficiency of item search, placement, and retrieval. Together, these strategies contribute to a sustainable and efficient warehouse design.
Optimization of Biodiesel Synthesis from Avocado Seeds Using Response Surface Methodology (RSM) Nicander, Priscillia stevanies; Muljani, Srie; Darma, Apriandi Putra
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.42035

Abstract

The synthesis of biodiesel from avocado seed oil has been successfully conducted. This study aimed to determine the optimized parameters for the transesterification reaction using Response Surface Methodology (RSM). The transesterification reaction was carried out with variations in the methanol mole ratio of 1:4, 1:6, and 1:8 at temperatures of 40 C, 50 C, and 60 C, utilizing 1 wt% KOH relative to the oil. The avocado seed oil, obtained from the extraction process, has a free fatty acid content of 1.95%. The RSM results indicated that the optimized parameters for biodiesel production were at a temperature of 60 C with a methanol mole ratio of 1:6. The final yield achieved was 82%, calculated based on the initial weight of the oil. The biodiesel produced had a cetane number of 75, a density of 877.4 kg/m, and a viscosity of 4.768 cSt. These values meet the SNI standards, which require a minimum cetane number of 51, a density of 850890 kg/m, and a viscosity of 2.36 cSt.
Improving Carrageenan Extraction Efficiency and Stability Using KOH, NaOH, and Anti-Caking Agents Heriyanto, Heri; Dewi Yasya, Annisa; Rahma Putri, Azzahra; Suhendi, Endang; Kanani, Nufus; Pujiastuti, Hendrini
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.42031

Abstract

This study investigates the impact of varying concentrations of potassium hydroxide (KOH) and sodium hydroxide (NaOH), along with anti-caking agents, on the quality of carrageenan extracted from Eucheuma cottonii seaweed. FTIR analysis revealed that KOH-extracted carrageenan retained key functional groups, including sulfate esters and glycosidic bonds, essential for its classification as kappa-carrageenan. KOH also proved more effective than NaOH in reducing moisture content, preserving structural integrity, and meeting the Indonesian National Standards (SNI) for carrageenan quality. The addition of anti-caking agents further optimized product stability, particularly in moisture control. The result shows that KOH was more effective than NaOH in improving carrageenan yield, with a yield of 46% achieved using 12% KOH and 4 g TCP. Anti-caking agents like tricalcium phosphate improved the products moisture control and stability. Future research should focus on refining extraction methods to enhance both product quality and yield.
Enhancement of Functional Characteristics of Beneng Taro Noodles by Incorporating Garlic Nanoparticles as Bioactive Compounds Agustina, Sri; Altisa, Reysa Previana; Rahadatul'aisy, Nadiya; Fithri, Anjenny Syfha Nabhila; Rahma, Elvira Aulia
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.41818

Abstract

Functional noodles were prepared using Beneng Taro starch and garlic nanoparticles, employing a nanocomposite technology method. The incorporation of garlic nanoparticles into the starch matrix was confirmed through FTIR analysis, which indicated an association with protein content in the functional noodles, providing health benefits. The addition of garlic nanoparticles increased the protein content of the noodles by up to 13.19% (w/w), enhancing their nutritional profile. Higher protein levels contribute to longer cooking times due to the extended denaturation process, while bioactive compounds such as allicin and flavonoids offer antioxidant and antimicrobial properties, which may reduce the risk of chronic diseases and improve overall health. Functional noodles with 2,5% (w/w) garlic nanoparticles required less than 5 minutes to cook, while concentrations of 5% and 12,5% led to cooking times of up to 17 and 30 minutes, respectively. Additionally, the bioactive compounds in garlic nanoparticles contributed to an extended shelf life by exhibiting antimicrobial and antioxidant properties. These findings highlight the potential of garlic nanoparticles to improve the nutritional and functional properties of food products, making them a promising option for health-oriented consumers.
Synthesis of Microgel Sulfated Carboxymethyl Cellulose (SCMC) by Double Crosslinked Alginate from Lindur Fruit (Bruguiera gymnorrhiza) for Diabetic Ulcer Healing Hutapea, Jobin Armando; Zaki, Nesfitra Dzakwan; Syahrum, Silvina Faradilla; Putra, Surya Andika; Marbun, Sarah Aknesia; Tarigan, Indra Lasmana
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.40112

Abstract

Microgels have been recognized as promising scaffolds for diabetic wound care due to their favorable properties in promoting wound healing. This study aims to synthesize a microgel using sulfated carboxymethyl cellulose (SCMC) derived from Lindur fruit (Bruguiera gymnorrhiza) for potential application in diabetic ulcer treatment. The synthesis was conducted through a double-crosslinking reaction, and the resulting microgel was characterized using infrared (IR) spectroscopy, scanning electron microscopy (SEM), and in vivo analysis in male mice (Mus musculus). The results demonstrated that the yield of Ca-alginate isolate ranged from 18.67% to 19.46%, with a purity of 19.5%33.1%, viscosity of 31.1931.46 cP, and stable pH at 7. The Ca-alginate isolate exhibited antioxidant activity at 50 ppm with an inhibition percentage of 22.3%. The modification of SCMC was successfully achieved, as confirmed by the presence of characteristic absorption peaks at 1220 cm (asymmetric SO stretching) and 870 cm (symmetric COS stretching vibrations), indicating successful sulfate group incorporation. The microgel swelling ratio was recorded at 660% for microgel A, 700% for microgel B, and 720% for microgel C, with microgel C exhibiting the highest swelling capacity. In vivo wound healing assessment revealed that microgel C facilitated more rapid wound closure, with wound sizes reducing progressively from 0.9 cm on day 3 to 0.5 cm on day 5, 0.3 cm on day 7, and 0.1 cm on day 14. These findings suggest that SCMC-based microgel with alginate derived from Lindur fruit holds significant potential as an innovative formulation for diabetic wound management
Assessment of Sail River Water Quality in Pekanbaru City Using the STORET and Pollution Index (IP) Methods Fitria, Dewi; Suci, Nabila Rahma; Darmayanti, Lita
Jurnal Rekayasa Kimia & Lingkungan Vol 20, No 1 (2025): Jurnal Rekayasa Kimia & Lingkungan (June, 2025)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v20i1.40087

Abstract

The Sail River acts as the main drainage in Pekanbaru City. Several community activities around the Sail River, such as residential areas, plantations, livestock, shops, markets, and schools, cause decreasing in water quality in the Sail River. For this reason, it is necessary to analyze the water quality of the Sail River using the STORET method and the Pollution Index. The physical (temperature, TSS, TDS), chemical (pH, COD, DO, Pb), and biological (total coliform) parameters were analyzed. The results of the water quality analysis obtained were compared with Class II Water Quality Standards based on PP No. 22 of 2021. The results of the analysis of the quality status of the Sail River downstream based on the STORET method over the last five years show a "heavily polluted" condition, while the results of the IP method analysis show a "moderately polluted" condition. Based on the STORET and Pollution Index methods results, sail river needs a pollution control policy and management to overcome the pollution.

Page 31 of 32 | Total Record : 319

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