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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) CHEDS: Journal of Chemistry, Education, and Science JURNAL KIMIA SAINTEK DAN PENDIDIKAN Jurnal ABDIMAS MUTIARA
Gultom, Erdiana
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Materials Science & Nanotechnology Medicine & Pharmacology Nursing Physics Other

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PROCESSING OF SAWDOW WASTE OF MAHONI AND JATI WOOD AS A MATERIAL GYPSUM CEILING FILLERS WITH POLIVINYL ADHESIVE ALCOHOL Zai, Liver; Halawa, Estetika Niat Iman; Tarigan, Malemta; Gultom, Erdiana; Purwandari, Vivi; Jiamin, Ong Amanda
JURNAL KIMIA SAINTEK DAN PENDIDIKAN Vol. 7 No. 1 (2023): JURNAL KIMIA SAINTEK DAN PENDIDIKAN
Publisher : Program Studi Kimia - Universitas Sari Mutiara Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51544/kimia.v7i1.3986

Abstract

Along with the increase in population, the need for building materials, namely wood, will increase, thus triggering rampant illegal logging, which will cause floods, landslides, and global warming. One of the efforts made to reduce the use of wood is to make gypsum composite boards. This study aims to utilize mahogany wood waste and jati wood powder as gypsum board fillers. Research has been carried out on processing waste sawdust from mahogany and jati wood as a filling material for making gypsum ceilings with polyvinyl alcohol adhesive by mixing and compacting using a hot compressor at 70o C. Good quality with a density value of 0.82 g /cm3 and absorption capacity of 38.4% complied with SNI 03-2105-2006. Mechanical properties with variations in impact strength (95:5:10) of 19.014 J/m2, flexural strength of variation (95:5) of 395, 446 N/m2, and fracture strength of variation (95:5:5) of 1.7758 N/m2. A Gypsum board was obtained, which did not meet SNI 03-6384-2000 on the gypsum board specification for the results of testing for flexural strength and fracture strength.
INCREASING TRANSPARENT SOAP PRODUCTION BY UTILIZING VIRGIN COCONUT OIL (VCO) AND ORANGE PEEL EXTRACTTO INCREASE ANTIOXIDANT PROPERTIES Hestina; Gultom, Erdiana; Zai, Liver Iman Putra; Mendrofa, Yelsin Alfidar
JURNAL KIMIA SAINTEK DAN PENDIDIKAN Vol. 7 No. 2 (2023): JURNAL KIMIA SAINTEK DAN PENDIDIKAN
Publisher : Program Studi Kimia - Universitas Sari Mutiara Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51544/kimia.v7i2.4809

Abstract

Orange peel may be a plant that produces fundamental oils that are utilized as cancer prevention agents. Straightforward soap is one of the cleanser innovations that creates cleanser more alluring and includes a smoother froth. In this ponder utilizing the refining strategy to get fundamental oil extricates from orange peels. At that point, in this ponder utilizing virgin coconut oil as an fixing in making cleanser, where virgin coconut oil (VCO) is an oil determined from coconut starch quintessence containing tall lauric corrosive which serves to smooth and moisturize the skin.  The examination conducted in this think about was the investigation of water substance, cleanser pH, tall froth, free antacid, cancer prevention agents, and FTIR. The strategy utilized in analyzing antioxidant movement in this think about is the DPPH strategy. In this ponder, water substance was gotten as much as 18%, 26%, 28%, and 30%. The pH esteem in this consider contains a esteem of 8 and free soluble base test values were gotten at 0.2%, 0.3%, 0.2% and 0.1%. For the test esteem of antioxidant action of basic oils gotten by 63.95%, in straightforward cleanser with the expansion of fundamental oils gotten by 64.14%, in straightforward cleanser without the expansion of basic oils gotten by 45.23%. For tall yields froth is gotten on normal 7 cm. The esteem of pH and free antacid substance in this think about has met the Indonesian National Standard (SNI) for straightforward strong cleanser.
PEMBUATAN DAN KARAKTERISASI CARBON DOTS DARI TANAMAN KUNYIT PUTIH DENGAN METODE HIDROTERMAL Hestina, Hestina; Gultom, Erdiana; Waruru, Imania
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 2 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i2.10073

Abstract

Carbon Dots merupakan nanopartikel yang memiliki intensitas fluoresensi tinggi, sifat optik yang baik, biokompatibilitas tinggi, sifat kimia stabil dan mudah diaplikasikan. CDot dapat digunakan untuk biosensor. CDot dapat disintesis dari bahan alami atau sintetis.  CDot yang disintesis dari bahan alami lebih ramah lingkungan dan berbiaya rendah. Salah satu sumber CDots alami adalah kunyit putih. Senyawa yang terkandung dalam kunyit putih antara lain saponin, alkaloid, triterpenoid, flavonoid, tanin dan polifenol. Kunyit putih dapat digunakan sebagai antibakteri. Teknik maserasi dan metode hidrotermal digunakan untuk mensintesis Cdots. Berdasarkan hasil penelitian diperoleh CDot kunyit putih yang berhasil disintesis. Hasil analisis FTIR pada ekstrak kunyit putih dan Cdots menunjukkan adanya gugus O-H, C-H, C=O, O-CH3. Hasil analisa UV-Vis pada panjang gelombang 200-800 nm dengan intensitas tertinggi 348 nm. Analisis antibakteri terhadap Staphylococcus aureus dengan indeks mikroba 0,5 mm
SINTESIS DAN KARAKTERISASI CARBON DOTS DARI KULIT SEMANGKA DENGAN METODE HIDROTERMAL Gultom, Erdiana; Hestina, Hestina; Hulu, Kurniawati
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 2 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i2.10223

Abstract

Tingkat konsumsi semangka semakin meningkat, Pernyataan ini sesuai dengan data Badan Pusat Statistik (2020) produksi semangka tahun 2018 sebanyak 481.744 ton, tahun 2019 sebanyak 523.300 ton, dan tahun 2020 sebanyak 523.335 ton. Meningkatnya jumlah konsumsi semangka sebanding dengan limbah yang dihasilkan. Oleh karena itu, sangat penting untuk mengolah limbah tersebut menjadi material yang lebih bernilai, salah satunya adalah carbon dot. Titik karbon ini banyak digunakan sebagai pendeteksi ion logam berat, sensor, penghantaran obat, katalis, dan fotovoltaik. Sintesis titik karbon dari limbah kulit semangka menggunakan metode hidrotermal pada suhu 150oC dengan variasi waktu 1,2,3 jam. Hasil uji optik titik karbon dengan senter laser biru, pada sampel pertama tidak terjadi perubahan warna, sampel kedua mengalami perubahan warna menjadi biru kehijauan sedangkan sampel ketiga menjadi kuning kehijauan. Adanya perubahan warna membuktikan bahwa titik karbon telah berhasil disintesis. Karakterisasi titik karbon dengan UV-Vis menunjukkan bahwa puncak serapan pada panjang gelombang 200-400 nm menunjukkan puncak serapan titik karbon. Pengujian FTIR menunjukkan bahwa pada setiap sampel ditemukan gugus fungsi O-H, C=C
The Effect of Visual, Audiotory, and Kinesthetic (VAK) Learning Models on Science Learning Outcomes Sinaga, Eka Margareta; Rozi, Fahrur; Silalahi, Eka Kartika; Gultom, Erdiana; Sihombing , Betty Agatha
Jurnal Penelitian Pendidikan IPA Vol 11 No 8 (2025): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i8.12160

Abstract

Low learning outcomes in IPAS (Natural and Social Sciences) among elementary school students are often caused by limited student engagement and learning methods that do not accommodate diverse learning styles. This study aims to determine the effect of the VAK (Visual, Auditory, Kinesthetic) learning model on the learning outcomes of fourth-grade students in IPAS subjects at SD Negeri 067246 Medan Tuntungan. The research employed a quantitative approach with a one-group pretest-posttest design, involving 30 purposively selected students from class IVB. Instruments used were learning outcome tests and student response questionnaires. The test assessed students’ knowledge before and after the implementation of the VAK model, while the questionnaire gathered students' responses toward the applied learning model. Data were analyzed using a paired sample t-test with SPSS version 22. Results showed an increase in the average score from 56.27 (pretest) to 85.33 (posttest). The t-test yielded a significant value of 0.000 < 0.05, indicating a statistically significant improvement in learning outcomes after the use of the VAK model. Furthermore, 60% of students responded positively to the learning process. These results suggest that the VAK model supports student engagement and accommodates various learning styles in IPAS learning.
Co-Authors Adiansyah Andika Wahyu Agung Aritonang, Barita Deboy Anugerah Gea Eka Kartika Silalahi Eka Margareta Sinaga Fahrur Rozi Halawa, Estetika Niat Iman Hestina Hestina, Hestina Hulu, Kurniawati Jhonialman Tafonao Jiamin, Ong Amanda Joko Mendrofa Liver Iman Putra Zai Mahyuni Harahap Mendrofa, Yelsin Alfidar Nova Florentina Ambarwati Purwandari, Vivi Riah Ukur Ginting Riah Ukur Ginting, Riah Ukur Sihombing , Betty Agatha Sowua Putra Hia Suniati Zabua Tarigan, Malemta Todo Marnaek Nababan Vivi Purwandari Waruru, Imania Winta Lase Zai, Liver Zai, Liver Iman Putra