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Jurnal Teknik Kimia USU
Published by TALENTA PUBLISHER
ISSN : -     EISSN : 23374888     DOI : https://doi.org/10.32734/jtk.v11i1
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Jurnal Teknik Kimia USU merupakan jurnal elektronik yang mempublikasikan karya ilmiah di bidang teknik kimia yang diterbitkan oleh Departemen Teknik Kimia, Fakultas Teknik, Universitas Sumatera Utara. Jurnal ini tidak terbatas pada mahasiswa dan dosen Universitas Sumatera Utara, tetapi terbuka untuk mahasiswa, dosen dan peneliti dari instansi lain.
Arjuna Subject : Teknik Kimia (semua kategori) - Teknik Kimia (Lain-Lain)
Articles 337 Documents
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Pengaruh Jumlah Sel Elektroda Terhadap Produksi Gas Hidrogen dengan Proses Elektrolisis sebagai Sumber Energi Fuel Cell Erlinawati; Mahesi, Trin Zikir; Saputra, Richo; Febriana, Ida; Effendy A, Sahrul
Jurnal Teknik Kimia USU Vol. 14 No. 1 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i1.18064

Abstract

Hydrogen is an environmentally friendly, carbon-free renewable energy source that can be generated through reactions with oxygen to produce electricity. One method of producing hydrogen is via water electrolysis. The aim of this study was to determine the optimal conditions for hydrogen gas production, specific energy consumption, and the use of hydrogen gas as an energy source for Proton Exchange Membrane (PEM) fuel cells, using potassium hydroxide (KOH) at concentrations of 0.1 M, 0.2 M, 0.3 M, and 0.4 M. The electrolysis process was conducted at a voltage of 10 volts for 30 minutes. The results showed that the highest hydrogen gas production, 0.8927 L, was achieved with 18 electrode cells and a KOH concentration of 0.3 M. The optimal specific energy consumption was 33,269 joules under the same conditions. The maximum efficiency of the PEM fuel cell was 47.25%, while the minimum efficiency was 44.80%
Penyediaan Biofilm Berbasis Pektin Kulit Buah Cempedak (Artocarpus champaden L.) Terisi Carboxymethyl Cellulose dengan Variasi Konsentrasi Gliserol Untuk Menurunkan Susut Bobot Buah Mangga Batu Bara, Fachreza Amri; Pratama, Muhammad A.; Ginting, Muhammad Hendra S.; Harahap, Hamidah; Dalimunthe, Nisaul Fadilah; Al Fath, Muhammad Thoriq
Jurnal Teknik Kimia USU Vol. 14 No. 1 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i1.18721

Abstract

Cempedak peel contains 38.85% pectin compounds and has the potential to become biofilm raw material. The characteristics of pectin-based biofilm can be improved by the addition of a glycerol plasticizer. This study aims to determine the effect of variations in glycerol concentration (0%; 3%; 5%; 7% and 9%) on biofilm charactersitics and biofilm application on the shelf life of mango fruit. Pectin was extracted using 5% citric acid at 85°C or 90 minutes. Biofilms were applied on mango fruit for 8 days. Analysis of pectin compounds showed a yield 22.09%; ash content 7.40%; equivalent weight 588.235 mg; methoxyl content 6.20%; galacturonic acid content 36.12%. Analysis of physical properties and biofilm application on mango fruit showed a density value of 2.833 g/mL; water solubility 79.41%; mango weight loss of 33.47%; and a deacrease in vitamin C of 5%. SEM-EDX analysis showed the pectin particles were homogeneous fine grains and dominated by the element of oxygen (O) 88.84%. FTIR analysis of cempedak fruit peel pectin and biofilm showed functional groups of O-H; C-H (methyl); C=O; C-O; C-C.
Inovasi Edible Coating Buah Mangga Berbasis Kitosan Kulit Udang dengan Aditif Ekstrak Daun Asam Jawa sebagai Antimikroba Pratama, Deska Rizki; Berutu, Aidha Sekar; Husin, Fahrizal; Panjaitan, Maychel Yohana; Taslim
Jurnal Teknik Kimia USU Vol. 14 No. 1 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i1.19093

Abstract

Edible coating is a thin layer that can be consumed which protects the surface of the fruit from environmental influences. This study evaluates the effectiveness of shrimp shell chitosan-based edible coating with tamarind leaf extract as an antimicrobial, along with glycerol and tween 80, in preserving mango quality during 15 days of storage. The variables evaluated were the concentration of tamarind leaf extract (0.5, 1.0, and 1.5%) and mango storage duration (0, 3, 6, 9, 12, and 15 days). While the amount of chitosan used was constant. The parameters measured included total microbial count, weight loss, fruit skin color, total soluble solids, titratable acidity, and vitamin C content. The results showed that the combination of shrimp shell chitosan and tamarind leaf extract as an antimicrobial significantly reduced the degradation of mango quality, with the 0.5% concentration of tamarind leaf extract being the most effective in maintaining quality and extending shelf life of mango until 15 days.
Pengaruh Konsentrasi Methylene Blue dan NaClO pada Proses Degradasi Photocatalytic Fuel Cell Menggunakan Elektroda Cu-TiO2/ZnO Putri Meylani, Cicilia; Sarah Dampang; Muhammad Fahmi Hakim; Fitri Yuliasari; David Kevin; Tarishah Setyowati Putri
Jurnal Teknik Kimia USU Vol. 14 No. 2 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i2.20525

Abstract

The contamination of synthetic dyes such as methylene blue has become a serious issue in textile industry wastewater due to its resistance to natural degradation. Photocatalytic Fuel Cell (PFC) technology is an effective and environmentally friendly method for degrading toxic dyes in wastewater. In this study, a dual-chamber PFC was developed using a photoanode composed of a Cu-TiO₂/ZnO semiconductor composite synthesized via the sol-gel method. The objective was to develop an efficient composite electrode and evaluate the effect of methylene blue and sodium hypochlorite (NaClO) concentrations on degradation efficiency. The composite was prepared with 5 wt% Cu, calcined at 200 °C, and deposited onto a glass substrate. Characterization using Scanning Electron Microscopy (SEM) revealed that the resulting nanoparticles exhibited a spherical morphology with diameters ranging from 0.22 µm to 4.33 µm. UV-Vis Diffuse Reflectance Spectroscopy (DRS) analysis showed that the band gap energy decreased from 3.18 eV (TiO₂/ZnO) to 2.29 eV after Cu doping. The experimental results demonstrated that the addition of NaClO enhanced the photocatalytic activity of the Cu-TiO₂/ZnO composite for methylene blue degradation, achieving an optimal degradation rate of 78% after 120 minutes of operation.
Optimasi dan Sintesis Selulosa Dialdehid Berbasis Limbah Tandan Kosong Kelapa Sawit Sitinjak, Elvri Melliaty; Masmur, Indra; Shuwanto, Hardy; Dina, Sari Farah; Hutajulu, Poltak Evencus; Saragih, Gimelliya; Siahaan, Immanuel; Damanik, Fadhila Natania; Doloksaribu, Rahel Argana
Jurnal Teknik Kimia USU Vol. 14 No. 2 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i2.20686

Abstract

Empty Fruit Bunches of Oil Palm (EFB) represent one of the most problematic biomass wastes in Indonesia due to their massive volume, inefficient management, and underutilization of their chemical potential, leading to significant environmental, economic, and technical impacts. The degradation or processing of such large-scale waste generally requires a long period of time. This study focuses on converting the cellulose content in EFB into dialdehyde cellulose (DAC), which can be applied as a wet strength agent. The aim is to reduce EFB waste by isolating cellulose from EFB biomass and subsequently converting it into DAC, which can be utilized as a wet strength additive in paper or tissue products. The oxidation of EFB cellulose into DAC was optimized using sodium periodate (NaIO₄) as the oxidizing agent, with varying reaction times of 3, 6, and 9 hours. The synthesized DAC was qualitatively analyzed using the Fehling’s test and solubility observations, followed by functional group identification via FTIR and morphological characterization using SEM. Among the samples, DAC-6 exhibited the most optimal characteristics, with a degree of oxidation reaching 82.1% and a carbonyl content of 52.8%. FTIR analysis confirmed the presence of carbonyl functional groups in all DAC samples, indicating successful oxidation of hydroxyl groups in cellulose. DAC-6 showed the most prominent carbonyl absorption peak at a wavenumber of 1748 cm⁻¹.
Pengaruh Penambahan Bio-filler Serbuk Pelepah Pisang pada Sifat Termal, Reologi, dan Mekanik Komposit Termoplastik Berbasis Polipropilena Nisa, Khadijah Sayyidatun; Aryanti, Fitria Ika; Wedian, Ariya
Jurnal Teknik Kimia USU Vol. 14 No. 2 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i2.20963

Abstract

This study examines the effect of banana stem powder (SPP) addition on the thermal, rheological, and mechanical properties of polypropylene (PP) composites with the addition of stearic acid. The composites were made with variations of PP:SPP of 100:0%, 98:2%, 96:4%, and 94:6% by weight. Differential Scanning Calorimetry testing showed the highest melting temperature of 165.4°C at 4% SPP, while the highest crystallinity of 42.64% was obtained at 2% SPP. The highest flow rate was obtained at 2% SPP of 8.83 g/10 min, and there was a decrease in the flow rate at 4% and 6% SPP. The tensile strength test results showed a decrease, from 30.10 MPa in pure PP to 23.40 MPa at 2% SPP. The results indicate that SPP can improve the thermal and rheological properties of the composite within certain limits, but excessive addition decreases the mechanical strength.
Sintesis Nanohibrida Silika-urea Berbasis Abu Bagasse sebagai Pupuk Lepas Lambat Ramah Lingkungan Siti Muslimah; Nazriati; Neena Zakia
Jurnal Teknik Kimia USU Vol. 14 No. 2 (2025): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v14i2.21629

Abstract

The urea–silica nanohybrid is an innovative slow-release fertilizer designed to enhance nitrogen use efficiency in agriculture. This study synthesized the nanohybrid using silica sourced from bagasse ash via the sol-gel method. Silica was extracted by reacting the ash with sodium hydroxide to form sodium silicate, which was then converted into silicic acid through ion exchange using a cation resin. Ammonium hydroxide was added to adjust the pH to 5, forming a gel at room temperature. The gel was aged for 18 hours to strengthen its structure, then freeze-dried to produce hydrophilic silica aerogel. To form the nanohybrid, 1 g of silica aerogel was mixed with urea at varying concentrations, stirred for 24 hours, filtered, and dried at 40 °C. Characterization using Fourier Transform Infrared Spectroscopy (FTIR) confirmed the presence of Si–O–Si and Si–OH groups, along with urea-specific bands (C=O and N–H), indicating successful integration of urea into the silica matrix.

Page 34 of 34 | Total Record : 337

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