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All Journal Jurnal Riset Kimia KOVALEN: Jurnal Riset Kimia Stannum : Jurnal Sains dan Terapan Kimia Indonesian Journal of Community Empowerment and Service Jurnal Pengabdian Masyarakat Bangsa
Nurwidiyani, Ria
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Adsorption Study of Carbon Chitosan Composite Beads from Ketapang Fruit Shell (Terminalia catappa L) on Methylene Blue Dyes Nurwidiyani, Ria; Sigiro, Chelin Dion; Putranto, Agus Martono Hadi; Triawan, Deni Agus
Stannum : Jurnal Sains dan Terapan Kimia Vol 6 No 2 (2024): October 2024
Publisher : Department of Chemistry - Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jstk.v6i2.5631

Abstract

Carbon chitosan composite beads were synthesized using chitosan and activated carbon from Ketapang fruit shells (Terminalia catappa L) using PVA as a crosslinker. The adsorbent was synthesized with a chitosan: activated carbon ratio of 0.8 grams versus 0.2 grams. Material characterization using FTIR shows the presence of C-O, N-H, C-N, C=O, C-H, and -OH functional groups. Adsorption of carbon chitosan composite beads on methylene blue achieved maximum results at a contact time of 75 minutes using an adsorbent mass of 0.15 grams with an adsorption percentage reaching 97%. The adsorption kinetics follows a pseudo second order kinetic model with a k value of 1.3467 mg-s-.
Profil Morfologi dan Difraksi Arang Hasil Pirolisis Beberapa Jenis Kayu Lokal Provinsi Bengkulu, Indonesia: Morphology and Diffraction Study of Charcoal By-Products from the Pyrolysis of Several Local Woods from Bengkulu Province, Indonesia Nurwidiyani, Ria; Triawan, Deni Agus; Rahman, Arief Aulia; Yudha, Sal Prima
KOVALEN: Jurnal Riset Kimia Vol. 10 No. 3 (2024): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2024.v10.i3.17289

Abstract

Wood, as a basic material for the furniture industry, creates waste problems in the form of wood sawdust. Wood sawdust is a material that can be utilized by processing it through a pyrolysis process to produce liquid smoke and charcoal. Charcoal resulting from sawdust pyrolysis of Azadirachta excelsa, Durio zibhetinus, Swietenia mahagoni, and Coffea sp. wood has different characteristics. Pyrolysis was carried out at 300–350 °C for 6 hours. Characterization was carried out using SEM-EDS and XRD. Based on the research, it is known that the character of the charcoal resulting from pyrolysis using XRD shows that the charcoal composition of each wood has similar characteristics, as indicated by the presence of a broad peak at 2 theta 25° indicating that the charcoal formed has an amorphous structure. In comparison, the 2 theta peaks of 17° and 29° respectively, indicate the presence of lignin and CaCO₃ in charcoal. The morphological structure of the charcoal surface based on the results of SEM analysis shows a similarity in morphology between Swietenia mahagoni and Coffea sp. Wood charcoal with small pore diameters and distances apart, as well as between Durio zibhetinus and Azadirachta excelsa wood charcoal, which resembles a honeycomb structure. The composition of charcoal resulting from pyrolysis shows that the largest component of charcoal is carbon with a percentage of 45.4-56%, calcium with a percentage of 10-15.2%, and oxygen with a percentage of 22.5-38.4%, with minor components in the form of aluminum, boron, silicon, and potassium.
Pendampingan Pembuatan Kompos Kulit Kopi pada Petani Kopi di Desa Watas Marga Kecamatan Curup Selatan Kabupaten Rejang Lebong Triawan, Deni Agus; Nurwidiyani, Ria; Notriawan, Doni; Mawarti, Siska
Jurnal Pengabdian Masyarakat Bangsa Vol. 3 No. 1 (2025): Maret
Publisher : Amirul Bangun Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59837/jpmba.v3i1.2163

Abstract

Tingginya produksi kopi di Kabupaten Rejang Lebong Provinsi Bengkulu menghasilkan kulit kopi yang cukup besar (40% - 50%). Kegiatan pengabdian ini bertujuan untuk melakukan pendampingan pembuatan kompos pada masyarakat petani kopi di Desa Watas Marga, Rejang Lebong guna mengoptimalkan potensi kulit kopi yang merupakan hasil samping pada proses pengolahan kopi. Kegiatan dilakukan melalui beberapa tahapan diantaranya penyampaian informasi, diskusi dan tanya jawab seputar proses pembuatan kompos dilanjutkan dengan praktik pembuatan kompos dari kulit kopi. Pembuatan kompos didasarkan dengan bantuan bakteri pengompos yaitu starter EM4. Komposisi kompos yang dibuat dengan dengan variasi kulit kopi : kotoran sapi berturut-turut 80:20 dan 50:50. Hasil kegiatan menunjukkan bahwa antusias masyarakat sangat tinggi ditunjukkan dengan keaktifan saat penyampaian informasi maupun saat praktik pembuatan kompos. Kompos yang dihasilkan memiliki kandungan hara yang sesuai untuk pupuk pertanian. Evaluasi saat kegiatan dapat diketahui bahawa terjadi peningkatan pemahaman peserta setelah kegiatan dibandingkan sebelum kegiatan. Kegiatan pengabdian ini dapat menjadi solusi dalam optimalisasi potensi kulit kopi dan dapat meningkatkan pendapatan masyarakat jika diproduksi dalam skala yang lebih besar.
Pelatihan Pembuatan Es Krim Homemade Sederhana di Desa Taba Air Pauh Kecamatan Tebat Karai Kabupaten Kepahiang Nurwidiyani, Ria; Angasa, Eka; Sutanto, Teja Dwi; Arman, Etriyanto
Indonesian Journal of Community Empowerment and Service (ICOMES) Vol. 5 No. 1 (2025): June 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/icomes.v5i1.41437

Abstract

Pelatihan pembuatan es krim homemade sederhana di Desa Taba Air Pauh Kecamatan Tebat Karai Kabupaten Kepahiang telah dilakukan. Kegiatan ini bertujuan untuk memberikan pengetahuan kimia sederhana serta pelatihan pembuatan es krim untuk anak-anak dan ibu rumah tangga. Es krim termasuk kedalam produk olahan susu yang digemari masyarakat karena memiliki nilai gizi yang tinggi. Meskipun begitu penggunaan bahan tambahan pangan pada es krim harus diwaspadai karena apabila dikonsumsi berlebihan dapat mengakibatkan gangguan kesehatan dalam jangka waktu yang panjang. Oleh karena itu pada pengabdian ini peserta diberikan pelatihan tentang pembuatan es krim homemade yang aman untuk dikonsumsi melalui metode ceramah dan praktek langsung. Hasil kegiatan ini menunjukkan bahwa peserta telah memahami proses pembuatan es krim homemade serta manfaatnya. Diharapkan kegiatan ini memberikan pengetahuan dan bisa meningkatkan ekonomi masyarakat disekitar Desa Taba Air Pauh Kecamatan Tebat Karai Kabupaten Kepahiang
Classification using FTIR and UV-Vis spectra combined with chemometrics and GC-MS profiles of Brucea javanica fruit extracts with different extracting solvents Triawan, Deni Agus; Banon, Charles; Nurwidiyani, Ria; Adfa, Morina
Jurnal Riset Kimia Vol. 16 No. 2 (2025): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v16i2.816

Abstract

Brucea javanica L. Merr. has long been used for its antimalarial, anti-diabetic, antibacterial, and antioxidant effects. Its bioactivity depends on both its chemical constituents and the type of solvent employed during extraction. Integrating FTIR and UV-Vis spectral data with chemometric approaches enables classification of fruit extracts based on the solvent used, while GC-MS analysis provides detailed compound identification. Using sonication, extraction with methanol, ethyl acetate, and n-hexane produced yields of 30.61% ± 0.80, 19.20% ± 0.75, and 18.12% ± 0.89, respectively. FTIR spectra were recorded over 600–4000 cm⁻¹, and UV-Vis spectra were measured across 200–800 nm. Analysis showed that ethyl acetate and n-hexane extracts exhibited similar profiles, which differed from that of the methanol extract. PCA successfully distinguished all three extracts, with cumulative PC1 and PC2 values above 70%. FTIR-based PCA provided better separation due to its broader fingerprint region compared to UV-Vis spectra. GC-MS results revealed that the compound profiles were largely similar across the extracts, although more compounds were detected in the methanol extract than in the ethyl acetate or n-hexane extracts.
Co-Authors Agus Martono Hadi Putranto Arman, Etriyanto Charles Banon Eka Angasa Mawarti, Siska Morina Adfa Notriawan, Doni Sal Prima Yudha Sigiro, Chelin Dion Sugeng, Santoso Teja Dwi Sutanto Triawan, Deni Agus