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Andriayani
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Sumatera Utara, Jl. Bioteknologi No. 1, Medan 20155, Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Neuroscience Physics Social Sciences

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The Construction of Oven Designed by Heat Exchanger in Drying Porang at SME Coco Prima Sebayang, Kerista; Ginting, Herli; Andriayani, Andriayani; Harahap, Agus Salim
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 2 (2019): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (961.372 KB) | DOI: 10.32734/abdimastalenta.v4i2.3549

Abstract

The small-medium enterprise (SME) Coco Prima has been under nurtured of LPPM USU since 2018. Ever since, it has been improving its productivity and diversifying its productivity into drying products. Currently, this SME manages porang as one of new export commodity. The problem faced by partners is a large and fast drying methodology. Porang or iles-iles are rotten raw materials that only last for three days after harvesting due to the unpleasant odors resulted more than three days, and subsequently, they cannot be processed. Drying under sunlight requires to four days reaching about 70% degree of dryness. Due to unfavorable weather conditions, the raw material becomes sweaty and moldy and produces black colour and soft textures. Therefore, a 3x3x2 cubic meter of drying oven has been constructed along with shelves and heat exchanges supported by liquid petroleum gas (LPG) gas. The heat exchange is designed accordingly to provide lower temperature in the oven, so that the air pressure within it is more efficient and less heat is wasted during reheating process. The heating is sufficient by using LPG and fan 18’. The oven is consisted of two layers in which between the layers are given glass wool as a heat barrier to the environment. It is also designed with a small vent exactly on the middle of the top with the intention to flow water vapour out from the vent, while the cold air is touched by that water vapour in the oven, it converts downward on the heat exchanger repeatedly. From this applied system, 750 kg iles-iles was heated within two days with a tube-of-12 kg LPG gas.
Teacher Upgrading Skill in Preparing Materials and Examination Based on Images in Sibolga City Andriayani, Andriayani; Zuhra, Cut Fatimah; Maghfirah, Awan; Yanti, Maulida; Gea, Saharman; Pasaribu, Khatarina Meldawati; Piliang, Averrous Fazlurrahman
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2020): ABDIMAS TALENTA : Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (277.089 KB) | DOI: 10.32734/abdimastalenta.v5i2.5495

Abstract

There are 61 primary/ibtidaiyah schools, 18 junior high schools, and 18 senior high schools in the city of Sibolga, which is located in Teluk Tapian Nauli, with a total number of teachers of about 2000. This is in line with the vision of Sibolga city (2016-2021) in order to create a stable, advanced, and successful Sibolga City by producing highly competitive quality human beings in order to create a harmonious, peaceful, secure and unified society. As mentioned above, one of its mission points is to prepare human resources (HR) that have integrity, reliable, competitive, expert in science and technology so that they able to compete in the global job market. As the education stakeholder, Sibolga Education and Culture Official has plan many outstanding work programs such as made a collaboration in partnership with the Universitas Sumatera Utara community service team. As a result, based on field observations and discussions, it was known that one of the obstacle that facing by the teachers in Sibolga is not being able to provide teaching materials and also picture-based examination questions as contained in the question grid. Currently, there are several technology-driven applications that can be used to make images or graphics creating process easier. Two of them are, GeoGebra Classic that used to create graphics and images in mathematics and Chemdraw that used to create structure images that related to chemistry. In addition word optimization training was also conducted to optimize teacher on preparing teaching materials with Ms. word.
Synthesis of Fluorescent Carbon Dots from Soybean Residuals Using Hydrothermal Method Ayu, Dinda G.; Gea, Saharman; Andriayani, Andriayani; Goei, Ronn
Jurnal Akademika Kimia Vol. 12 No. 2 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2023.v12.i2.pp71-77

Abstract

Soybean residuals are biowaste composed of carbon chains and amine groups bounded in peptide linkages. The component was identified through FTIR analysis which showed the vibration of the diamide bond (N=C=N) at wave number 2132cm-1. Owing to the existence of these components, soybean has the potential to be used as a precursor to synthesize carbon nano-material, such as Carbon Dots (C - Dots). In this study, the synthesis of C - Dots material from soybean residuals was carried out using the facile hydrothermal method at a temperature of 200 oC for 6 hours. Afterward, the as-synthesized C - Dots were analyzed for their optical property, structure, and morphology. Based on the analysis of the UV - Vis and photoluminescent spectra, C - Dots exhibited absorbance peaks of 292 nm and 301 nm in the UV light region, and fluorescence emission peaks of 468 nm, with blue luminescence characteristics. The observation was supported by the morphological analysis using the HR - TEM, C - Dots exist in a spherical shape with an average particle size of 3.467 nm and a lattice distance of 0.363 nm. Besides, the C - Dots exhibited a good quantum yield of 28.15 %. From the results of the analysis, it is known that the synthesis of C - Dots material has been successfully carried out with particle size < 10 nm.
The Effect of Chemical Activation Using Base Solution With Various Concentrations Towards Sarulla Natural Zeolite Saharman Gea; Agus Haryono; Andriayani Andriayani; Junifa Layla Sihombing; Ahmad Nasir Pulungan; Tiamina Nasution; Rahayu Rahayu; Yasir Arafat Hutapea
Elkawnie Vol. 6 No. 1 (2020)
Publisher : Faculty of Science and Technology Universitas Islam Negeri Ar-Raniry

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v6i1.6913

Abstract

Abstract : Material characteristics analysis of Sarulla natural zeolite (SNZ) with base activation has been carried out. The base used was NaOH at various concentrations; 0.2 M, 0.5 M, and 2 M. Base activated catalysts were characterized by X-ray Fluorescence (XRF), X-ray diffractometer (XRD), Fourier-transform Infrared (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM) and gas adsorption analysis using BET method. The procedures applied have caused differences in adsorption and desorption rates as well as the crystallinity values of the catalytic materials. Moreover, the ratio of Si/Al contents has also changed at the lowest concentration. On the other hand, the crystallinity of catalysts has decreased at the highest concentration of base applied. The results are reinforced in FTIR characterization which shows the changes of silanol bonds to become silicate and aluminate. Furthermore, morphological analysis of the catalysts shows that homogenous surface was obtained at low concentration, while rough/lumpy surfaces was obtained at higher concentration.Abstrak : Analisis terhadap karakteristik material dari zeolit alam Sarulla (SNZ) dengan metode aktivasi basa telah dilakukan. Basa yang digunakan ialah NaOH dengan berbagai konsentrasi; 0,2 M; 0,5 M, dan 2 M. Katalis yang telah diaktivasi dengan basa kemudian dikarakterisasi dengan Analisis X-ray Fluorescence (XRF), X-ray diffractometer (XRD), Fourier-transform Infrared (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM) dan Gas Adsorption menggunakan metode BET. Dari hasil penelitian, ditemukan perbedaan pada tingkat adsorpsi dan desorpsi, begitu juga dengan kristalinitas pada material katalis. Lebih jauh, rasio konten Si/Al juga berubah pada basa dengan konsentrasi terendah. Di sisi lain, tingkat kristalinitas dari katalis mengalami penurunan pada basa dengan konsentrasi tertinggi. Hasil ini diperkuat dengan data FTIR yang menunjukkan perubahan ikatan silanol menjadi silikat dan aluminat. Lebih jauh, analisis morfologi pada katalis menunjukkan bahwa permukaan yang homogen didapatkan dari penggunaan basa dengan konsentrasi rendah. Sebaliknya, basa dengan konsentrasi tinggi memberikan bentuk permukaan katalis yang tidak homogen serta kasar.
STRUCTURAL AND ELECTROCHEMICAL PROPERTIES OF CHITOSAN/GQDS/ZIF-67 COMPOSITES Sonia, Nessa Gina; Nainggolan, Irwana; Andriayani, Andriayani
Lantanida Journal Vol 14 No 2 (2026): July-December 2026
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v14i2.35174

Abstract

The development of materials based on Zeolitic Imidazolate Framework-67 (ZIF-67) has attracted attention in the field of electrochemical sensors due to their large surface area, good porosity, and the presence of Co²⁺ active sites, which play a role in enhancing electrochemical activity and electron transfer at the sensor surface. To improve the stability and conductivity of these materials, ZIF-67 is combined with biopolymers and carbon nanomaterials to form functional composites with optimized sensor performance. In this study, chitosan/graphene quantum dots/ZIF-67 (CS/GQDs/ZIF-67) composites were successfully synthesized via stirring and ultrasonication-assisted mixing. Variations in ZIF-67 concentration were tested at 500, 1000, 1500, 2000, and 2500 mg/L to determine the optimal composition for electrochemical response. At the same time, electrochemical properties were analyzed by cyclic voltammetry (CV). XRD analysis revealed the formation of a crystalline structure in the CS/GQDs/ZIF-67 composite. Interactions among the components in the composite were confirmed through FTIR analysis. Meanwhile, FE-SEM results showed that the surface morphology had become more homogeneous, and EDX analysis confirmed the presence of Co, C, O, and N in the composite structure. CV testing showed that increasing the scan rate increased the anodic peak current, with the optimum scan rate at 125 mV/s. In addition, the optimal ZIF-67 concentration was 1500 mg/L, yielding the highest anodic peak current of 1.0466 x 10-4 A, indicating enhanced electrochemical activity and electron transfer. Overall, the CS/GQDs/ZIF-67 composite shows good potential as an electrode modification material for the development of cyclic voltammetry-based electrochemical sensors.
Preparation and Characterization of Chitosan/Reduced Graphene Oxide Film as a Sensing Material Ardiansyah Sembiring; Irwana Nainggolan; Andriayani
Journal of Technomaterial Physics Vol. 5 No. 2 (2023): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v5i2.13306

Abstract

Sensing materials are crucial in a wide range of fields, including environmental monitoring, healthcare, security, and industrial applications. By leveraging their specific properties, sensing materials enable the development of innovative sensing devices and systems for improved detection, monitoring, and control of various parameters in our environment. This study aimed to prepare the chitosan/reduced graphene oxide film as sensing materials using a simple casting method. The reduced graphene oxide (rGO) was mixed with chitosan (CS), consisting of a concentration ratio of 200, 250, 300, 350, and 400 ppm. Three characterizations were used to describe the formed CS/rGO films, namely, Fourier transform infrared (FTIR), X-ray diffraction (XRD), and cyclic voltammetry (CV). FTIR and XRD analysis results were successfully performed, which showed that the process of loading of rGO and the film fabrication occurred in the physical interaction. The CV test also showed that the CS/rGO modified electrode has high sensitivity in PBH pH 7 and can be applied as a sensing material.
Co-Authors Agus Haryono Agus Salim Harahap Ahmad Nasir Pulungan Ardiansyah Sembiring Averroes F Piliang AVERROES FAZLUR RAHMAN PILIANG Ayu, Dinda G. Cut Fatimah Zuhra Febri Sindika Ginting, Herli Goei, Ronn Hadi Kurniawan, Hadi Herlince Sihotang, Herlince Irwana Nainggolan Junifa Layla Sihombing Kerista Sebayang Maghfirah, Awan Nofrijon Sofyan, Nofrijon NONI OKTARI Noni Oktari Nur Azizah Pasaribu, Khatarina Meldawati Piliang, Averrous Fazlurrahman Purwoko, Agus Rahayu Rahayu Raja, Saur Lumban Rizky Kurniawan Saharman Gea Saharman Gea Saharman Gea Saur L. Raja, Saur Saur Lumban Raja Sonia, Nessa Gina SRI RAHAYU Sri Rahayu Tiamina Nasution Yanti, Maulida Yasir Arafat Hutapea