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All Journal JOURNAL ONLINE OF PHYSICS SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Jurnal Pengabdian Magister Pendidikan IPA Equilibrium Journal of Chemical Engineering Archipelago Engineering CHEMTAG Journal of Chemical Engineering Journal of Green Chemical and Environmental Engineering
Geraldi Rahanra
Universitas Pattimura
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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PERHITUNGAN NILAI ENERGI CELAH PITA MINYAK KAYU PUTIH MENGGUNAKAN DATA PENGUKURAN SPEKTROFOTOMETER UV-VIS Jaya, Gede Wiratma; Nggolaon, Delpina; Rumpakwakra, Ervina; Rachmah, Alif Nur Laili; Rahanra, Geraldi; Taipabu, Muhammad Ikhsan; Trisnantari, Tamaratritania Citta; Badaruddin, Sabrianah
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 2 (2025): JOP (Journal Online of Physics) Vol 10 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i2.41575

Abstract

Minyak kayu putih merupakan salah produk pengolahan yang sering dimanfaatkan dalam kehidupan sehari-hari. Penelitian minyak kayu putih sebagian besar fokus pada uji kualitas berdasarkan Standar Nasional Indonesia (SNI) 3954:2014 dan 06-3954-2001. Penelitian ini bertujuan untuk mengetahui energi celah pita minyak kayu putih dari berbagai macam produk. Sampel penelitian sebanyak tiga sampel yang berasal dari produk peyulingan di Pulau Buru (sampel A), toko oleh-oleh (sampel B), dan swalayan (sampel C) di Kota Ambon. Ketiga sampel dilakukan pengukuran serapan panjang gelombang menggunakan spektrofotometer UV-Vis. Hasil pengukuran digunakan untuk menghitung nilai energi celah pita menggunakan metode Tauc Plot dengan transisi langsung Energi celah pita untuk sampel A, B, dan C masing-masing sebesar 3,404 eV, 3,348 eV, dan 3,722 eV. Hasil perhitungan menunjukkan minyak kayu putih memiliki potensi sebagai material pendukung dalam Dye Sensitized Solar Cell (DSSC). Hal ini dikarenakan nilai energi celah pita yang dihasilkan masih berada di area semikonduktor.
SUPERIOR PERFORMANCE IN REACTIVE DISTILLATION METHOD FOR INDUSTRIAL APPLICATION: A CASE STUDY OF ETHYL LACTATE PRODUCTION Taipabu, Muhammad Ikhsan; Rahanra, Geraldi; Rachmah, Alif Nur Laili; Badaruddin, Sabrianah; Trisnantaria, Tamaratritania C.; Tan, Clarissa
ALE Proceeding Vol 7 (2025): Archipelago Engineering (ALE)
Publisher : Fakultas Teknik Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ale.7.2025.97-104

Abstract

Ethyl lactate, a biodegradable and environmentally friendly solvent, offers a sustainable alternative to conventional petroleum-based solvents. This study presents a comprehensive evaluation of ethyl lactate production through both conventional and intensified process designs using rigorous process simulation. The reactive distillation column (RDC) was identified as the most efficient configuration, achieving notable reductions in total capital cost (57.3%) and total operating cost (40.2%) compared to traditional setups. The NRTL thermodynamic model was employed to accurately capture non-ideal behavior among reactive components, and kinetic parameters were validated against experimental data. The results demonstrate that RDC-based process intensification significantly enhances economic performance while promoting sustainable chemical manufacturing, positioning it as a promising approach for future green solvent production.
Edukasi ecoprint dengan teknik pounding berbasis kearifan lokal, sebagai pewarnaan ramah lingkungan di Mamala, Maluku Tengah Trisnantari, Tamaratritania Citta; Rachmah, Alif Nur Laili; Rahanra, Geraldi; Taipabu, Muhammad Ikhsan; Badaruddin, Sabrianah; Rumpakwakra, Ervina; Jaya, Gede Wiratma; Nggolaon, Delpina; Alzagladi, Safina Utari
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 9, No 5 (2025): September
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v9i5.34077

Abstract

Abstrak Penggunaan pewarna sintetis dalam industri tekstil dapat menimbulkan risiko pencemaran lingkungan dan membahayakan kesehatan manusia. Oleh karena itu, ecoprint hadir sebagai alternatif pewarnaan ramah lingkungan yang memanfaatkan warna alami dari tumbuhan. Kegiatan Pengabdian kepada Masyarakat (PkM) ini bertujuan memberikan edukasi tentang bahaya pewarna sintetis, memperkenalkan ecoprint dengan teknik pounding, serta memanfaatkan kearifan lokal berupa tumbuhan sekitar sebagai pewarna alami. Mitra kegiatan ini adalah SMAS Muhammadiyah Mamala, Maluku Tengah, dengan peserta sebanyak 32 orang (30 siswa dan 2 guru). Metode pelaksanaan mencakup ceramah, diskusi, demonstrasi, dan praktik langsung pembuatan ecoprint pada tas katun menggunakan daun lokal seperti pakis dan pepaya jepang. Evaluasi dilakukan melalui pre-test dan post-test serta observasi selama kegiatan berlangsung. Hasil evaluasi menunjukkan peningkatan pemahaman peserta terhadap dampak pewarna sintetis dan prinsip ecoprint. Sebanyak 30 peserta menyatakan ingin kembali mencoba praktik ecoprint. Secara umum, peserta menunjukkan antusiasme tinggi dan mampu menghasilkan motif ecoprint yang unik. Meskipun terdapat kendala seperti keterbatasan alat dan hasil cetakan yang kurang jelas, kegiatan berjalan lancar dan memberi dampak positif terhadap peningkatan kesadaran lingkungan serta keterampilan kreatif peserta. Edukasi ecoprint ini berpotensi dikembangkan sebagai bagian dari kewirausahaan berbasis sekolah dengan pendekatan edukatif dan berkelanjutan. Kata kunci: ecoprint; teknik pounding; edukasi lingkungan; kearifan lokal; pewarna alami. Abstract The use of synthetic dyes in the textile industry poses significant risks to both environmental and human helath. As a sustainable alternative, ecoprint utilizes natural pigments from plant materials to create textile patterns without generating hazardous chemical waste. This community service program aimed to raise awareness about the environmental hazards of synthetic dyes, introduce the pounding technique in ecoprinting, and promote the use of local plant resources as natural dyes rooted in local wisdom. The activity was carried out at SMAS Muhammadiyah Mamala, Central Maluku, involving 32 participants (30 students and 2 teachers). The program combined educational lectures, discussions, demonstrations, and hands-on workshops in which participants applied the pounding technique to cotton tote bags using local foliage such as ferns and Japanese papaya leaves. Evaluation through pre- and post-tests, along with direct observation, indicated a significant improvement in participants’ understanding of eco-friendly dyeing practices. Most participants expressed strong interest in continuing ecoprinting activities. Despite minor challenges—such as limited tools and difficulties in achieving sharp prints—the program was successfully implemented. It fostered environmental awareness, creativity, and practical skills among students. This initiative demonstrates strong potential to be further developed into a school-based entrepreneurship model with ecological and educational value. Keywords: ecoprint; pounding technique; environmental education; local wisdom; natural dyes.
Inovasi Produksi Pati Sagu bagi Industri Rumah Tangga melalui Penerapan Sistem Terintegrasi di Negeri Rutong, Kota Ambon Rumpakwakra, Ervina; Geraldi Rahanra; Marcia Violetha Rikumahu; Brahma Jesayas Bua; Melvia Natalia Aponno
Jurnal Pengabdian Magister Pendidikan IPA Vol 8 No 4 (2025): Oktober-Desember 2025
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpmpi.v8i4.12930

Abstract

Provinsi Maluku memiliki potensi sagu yang melimpah sebagai sumber pangan lokal strategis untuk mendukung program swasembada pangan nasional. Namun, pengolahan sagu di Negeri Rutong masih dilakukan dengan cara tradisional menggunakan peralatan sederhana sehingga proses produksi memerlukan waktu lama, kapasitas terbatas, serta mutu produk kurang optimal. Kegiatan pengabdian masyarakat ini bertujuan untuk meningkatkan efisiensi dan kualitas produksi pati sagu melalui penerapan alat produksi terintegrasi yang terdiri atas pemarut, press, dan bak penampung. Metode pelaksanaan pengabdian meliputi sosialisasi, pelatihan, penerapan teknologi, serta pendampingan dan evaluasi. Hasil inovasi yang dilakukan menjadikan mitra “Duta Sagu” lebih terampil mengoperasikan alat modern, efisiensi waktu produksi, dan menghasilkan pati sagu yang lebih bersih, karena serat kasar dapat terpisah dengan baik, serta kadar air lebih terkontrol sehingga hasil pati sagu akan lebih optimal. Dengan demikian, teknologi ini relevan untuk mendukung penguatan pangan lokal berbasis sagu untuk peningkatan produktivitas sekaligus mendorong peningkatan ekonomi masyarakat
Optimization of Biodegradable Films from Avocado Seed Starch Using Response Surface Methodology Rachmah, Alif Nur Laili; Badaruddin, Sabrianah; Trisnantari, Tamaratritania Citta; Rahanra, Geraldi; Sekaringgalih, Ratri
Journal of Green Chemical and Environmental Engineering Vol. 2 No. 1 (2026): Journal of Green Chemical and Environmental Engineering
Publisher : Candela Edutech Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63288/jgcee.v2i1.23

Abstract

This study aimed to develop and optimize biodegradable films based on avocado seed starch (Persea americana) using glycerol as a plasticizer and chitosan and carrageenan as fillers. The film formulation was optimized using Response Surface Methodology (RSM) with a Box–Behnken Design to evaluate the effects of formulation variables on biodegradability and mechanical properties. The biodegradability values ranged from 31.93 % to 51.94 %, indicating that all films were biodegradable. Increasing glycerol and carrageenan concentrations significantly increased biodegradability, while higher chitosan concentration improved tensile strength but reduced biodegradability. The optimal formulation was obtained at 2.96 % glycerol, 1.56 % chitosan, and 2.85 % carrageenan, with a predicted biodegradability of 53.11 %. The results indicate a trade-off between mechanical strength and biodegradability, where higher plasticizer content enhances degradation but reduces tensile strength. This study demonstrates that RSM optimization is effective in producing biodegradable films with balanced mechanical and environmental performance, highlighting the potential of avocado seed starch as a sustainable packaging material.
RESPONS PERTUMBUHAN CHLORELLA sp. TERHADAP PENAMBAHAN LIMBAH CAIR ORGANIK PADA MEDIUM KULTIVASI Geraldi Rahanra; Ivonne Telussa; Ervina Rumpakwakra; Alif Nur Laili Rachmah; Sabrianah Baddarudin; Tamaratritania Citta Trisnantari; Muhammad Ikhsan Taipabu
CHEMTAG Journal of Chemical Engineering Vol 7, No 1 (2026): CHEMTAG Journal of Chemical Engineering
Publisher : Universitas 17 Agustus 1945 (UNTAG) Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56444/cjce.v7i1.7040

Abstract

Limbah cair pengolahan sagu dan tahu mengandung nutrien yang berpotensi dimanfaatkan untuk kultivasi Chlorella sp. Karakterisasi meliputi pH, Chemical Oxygen Demand (COD), total karbon (TC), total nitrogen (TN), dan total fosfor (TP), kemudian limbah cair ditambahkan ke dalam medium NaCl salinitas 28 ppt. Kultivasi dilakukan selama 24 hari pada intensitas cahaya 5000 lux dengan fotoperiode 12:12 jam. Air limbah pengolahan tahu menunjukkan kandungan nutrien lebih tinggi dibandingkan air limbah pengolahan sagu, dengan COD masing-masing 23,49 mg/L dan 12,65 mg/L. Konsentrasi sel maksimum diperoleh pada medium kontrol (MK) sebesar 38 × 10⁵ sel/mL (hari ke-21), diikuti perlakuan suplementasi air limbah pengolahan tahu (MLT) sebesar 34 × 10⁵ sel/mL dan air limbah pengolahan sagu (MLS) sebesar 24,9 × 10⁵ sel/mL. Suplementasi limbah cair tidak meningkatkan pertumbuhan dibandingkan kontrol, yang dapat dipengaruhi oleh kondisi pH asam, rasio C:N yang rendah, serta salinitas tinggi yang berpotensi menimbulkan stres osmotik. Meskipun demikian, kedua jenis limbah tetap mampu mendukung pertumbuhan mikroalga dan menunjukkan potensi integrasi kultivasi mikroalga dengan pengolahan limbah cair secara berkelanjutan.
Peningkatan keterampilan siswa melalui pelatihan pengolahan limbah ampas sagu menjadi pupuk organik cair di SMAS Muhammadiyah Mamala, Maluku Tengah Alif Nur Laili Rachmah; Sabrianah Badaruddin; Tamaratritania Citta Trisnantari; Geraldi Rahanra; Muhammad Ikhsan Taipabu; Charis Gladi Iman Makoy
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 10, No 2 (2026): April
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v10i2.38675

Abstract

Abstrak Desa Mamala, Kabupaten Maluku Tengah, menghasilkan limbah ampas sagu dalam jumlah besar yang belum dimanfaatkan secara optimal dan berpotensi mencemari lingkungan. Padahal, limbah tersebut memiliki kandungan bahan organik yang tinggi sehingga berpotensi diolah menjadi pupuk organik cair (POC) yang ramah lingkungan dan bernilai ekonomi. Kegiatan pengabdian kepada masyarakat ini dilaksanakan oleh tim dosen dan mahasiswa Program Studi Teknik Kimia Universitas Pattimura dengan tujuan meningkatkan pengetahuan, keterampilan, serta kesadaran lingkungan siswa dan guru SMAS Muhammadiyah Mamala. Metode pelaksanaan meliputi koordinasi dengan pihak sekolah, sosialisasi pemanfaatan limbah ampas sagu, pelatihan pembuatan POC, serta evaluasi malalui penyebaran kuesioner. Hasil kegiatan menunjukkan peningkatan pemahaman dan keterampilan peserta, yang ditunjukkan oleh respon positif (sangat setuju dan setuju) sebesar 93,75%–100% pada sebagian besar indikator. . Antusiasme peserta sampasma pelatihan juga mendorong munculnya inisiatif pemanfaatan POC di lingkungan sekolah. Program ini berkontribusi dalam meningkatkan kesadaran lingkungan, memperkuat pembampasjaran berbasis potensi lokal, serta mendukung penerapan ekonomi sirkular di masyarakat. Kata kunci: ampas sagu; limbah organik; keterampilan siswa; pelatihan; pupuk organik cair. Abstract Mamala Village, Central Maluku Regency, produces a large amount of sago pulp waste that has not been optimally utilized and has the potential to cause environmental pollution. In fact, this waste contains high organic matter and has the potential to be processed into liquid organic fertilizer (LOF), which is environmentally friendly and economically valuable. This community service activity was conducted by lecturers and students from the Department of Chemical Engineering, Pattimura University, with the aim of improving the knowledge, skills, and environmental awareness of students and teachers at SMAS Muhammadiyah Mamala. The implementation methods included coordination with the school, socialization on the utilization of sago pulp waste, technical training on the production of LOF, and evaluation through questionnaires. The results of the activity indicate an improvement in participants’ understanding and skills, as evidenced by positive responses (strongly agree and agree) ranging from 93.75% to 100% across most indicators. . Participants’ enthusiasm during the training also encouraged initiatives to utilize LOF within the school environment. This program contributes to enhancing environmental awareness, strengthening learning based on local potential, and supporting the implementation of a circular economy in the community. Keywords: sago waste; organic waste; student skills; training; liquid organic fertilizer.
Gamma Spectrometric Analysis of Natural Radionuclides and Radiological Hazards in Ilmenite Sand Tibalia, Esther Mutiara Santallum Ekklesia; Hapsari, Farida Diyah; Trisnantari, Tamaratritania Citta; Rahanra, Geraldi; Taipabu, Muhammad Ikhsan
Equilibrium Journal of Chemical Engineering Vol 10, No 1 (2026): Volume 10, No 1 July 2026 (First Online)
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v10i1.116251

Abstract

Ilmenite sand, categorized as Naturally Occurring Radioactive Material (NORM), contains radionuclides derived from the uranium and thorium decay series. The present work investigates radionuclide concentrations in ilmenite sand collected from a mineral processing facility to evaluate associated radiological hazards using gamma spectrometry. Activity measurements were performed with a gamma spectrometry system calibrated for energy and efficiency using a Eu-152 reference source. Environmental background radiation was measured separately to correct spectral data during analysis. Prior to measurement, samples were dried, homogenized, and sealed in airtight containers to establish radioactive equilibrium between parent radionuclides and their progeny. Radionuclide activities were quantified based on characteristic gamma-ray peak energies. The measured activity concentrations were 472.98 Bq/kg for Ra-226, 302.20 Bq/kg for Th-232, and 10.68 Bq/kg for K-40. Radiological hazard parameters, including radium equivalent activity (Raeq), external hazard index (Hex), internal hazard index (Hin), and absorbed dose rate, were subsequently calculated. The estimated annual effective dose was 0.492 mSv/year, remaining below the recommended public exposure limit of 1 mSv/year. These findings indicate that, despite relatively elevated radionuclide activities, the resulting radiation exposure levels remain within acceptable safety limits. Overall, gamma spectrometry demonstrates reliable capability for radionuclide identification and radiological risk assessment in mineral-based materials.
Co-Authors Alif Nur Laili Rachmah Alif Nur Laili Rachmah Alzagladi, Safina Utari Badaruddin, Sabrianah Brahma Jesayas Bua Charis Gladi Iman Makoy Ervina Rumpakwakra Gede Wiratma Jaya Hapsari, Farida Diyah Ivonne Telussa Marcia Violetha Rikumahu Melvia Natalia Aponno Muhammad Ikhsan Taipabu Muhammad Ikhsan Taipabu Nggolaon, Delpina Ratri Sekaringgalih Taipabu, Muhammad Ikhsan Tamaratritania Citta Trisnantari Tan, Clarissa Tibalia, Esther Mutiara Santallum Ekklesia Trisnantari, Tamaratritania Citta