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All Journal TEKNIK JURNAL KIMIA SAINS DAN APLIKASI Publikasi Pendidikan JURNAL TEKNOLOGI LINGKUNGAN CHEMICA Jurnal Teknik Kimia Jurnal Teknologi Pangan Jurnal Teknik Kimia Eksergi: Chemical Engineering Journal Majalah Ilmiah MOMENTUM E-Dimas: Jurnal Pengabdian kepada Masyarakat Indonesia Chimica Acta Journal Of Chemical Process Engineering (JCPE) Turbo : Jurnal Program Studi Teknik Mesin JAST : Jurnal Aplikasi Sains dan Teknologi Jurnal Teknik Kimia Jurnal Metalurgi dan Material Indonesia RADIAL: JuRnal PerADaban SaIns RekAyasan dan TeknoLogi Jurnal Inovasi Teknik Kimia Journal of Community Empowerment for Health Jurnal Abdi Insani JURNAL FLYWHEEL Nusantara Science and Technology Proceedings International Journal Of Science, Technology & Management (IJSTM) International Journal of Eco-Innovation in Science and Engineering (IJEISE) AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Pengbdian Teknik Mesin Biomedical and Mechanical Engineering Journal Envirotek : Jurnal Ilmiah Teknik Lingkungan Innovative: Journal Of Social Science Research Jurnal Teknik Kimia dan Lingkungan Maddana: Jurnal Pengabdian Kepada Masyarakat Jurnal Akademik Pengabdian Masyarakat Journal Of Chemical Process Engineering Journal Serambi Engineering (JSE) JURNAL REKAYASA KIMIA & LINGKUNGAN Dharmakayana: Journal of scientists, engineers, educators and scientific activists related to society development RADIAL: Jurnal Peradaban Sains, Rekayasa dan Teknologi
Luluk Edahwati
Department Of Mechanical Engineering, Universitas Pembangunan Nasional Veteran Jawa Timur, Surabaya 60294, Indonesia
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ANALISA PENGARUH VARIASI MATERIAL ABRASIF TERHADAP KEKASARAN PERMUKAAN DAN KEKUATAN ADHESI PADA BAJA KARBON SEDANG Moch Miftakhurrohman; Luluk Edahwati
JURNAL ILMIAH MOMENTUM Vol 20 No 2 (2024): Vol 20, No 2
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/jim.v20i2.11811

Abstract

Pemberian lapisan coating merupakan salah satu cara untuk melindungi suatu material dari proses korosi agar mempunyai masa pakai lebih lama. Keberhasilan dari proses coating sangat bergantung pada proses surface preparation, proses ini akan mempengaruhi daya lekat cat dari suatu material. Salah satu teknik surface preparation yang umum digunakan adalah sandblasting. Penelitian ini bertujuan untuk mengoptimalkan nilai kekasaran permukaan pada material baja AISI 4340 dan mendapatkan nilai kekuatan adhesi yang optimal. Pada penelitian ini material abrasif yang dipakai adalah aluminium oxide dan pasir silika sementara untuk proses coating menggunakan cat primer jenis epoxy. Hasil penelitian menunjukkan bahwa spesimen yang di blasting menggunakan aluminium oxide memiliki nilai yang paling besar yaitu 65,5μm. Setelah proses blasting dan proses coating dilakukanlah pengujian daya lekat cat menggunakan alat portable adhesive tester dengan nilai tertinggi diperoleh spesimen yang di blasting menggunakan material abrasif aluminium oxide yaitu 12,87 MPa. Berdasarkan hasil pengujian, dapat disimpulkan bahwa daya lekat cat sangat dipengaruhi oleh jenis bahan abrasif yang digunakan. Aluminium oxide memberikan daya lekat yang lebih baik dibandingkan pasir silika, dengan ini pemilihan jenis abrasif sangat penting untuk mencapai daya lekat optimal, dan yang relevan untuk aplikasi di industri minyak dan gas.
Synthesis of Ca–Si–K–P Composite from Carbide Lime and Rice Husk using Precipitation Method Reyhan Firmansyah; Ayu Fakhira Yuliananda; Srie Muljani; Luluk Edahwati
International Journal of Eco-Innovation in Science and Engineering (IJEISE) Vol. 7 No. 01 (2026): IJEISE
Publisher : UPN Veteran Jatim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/ijeise.v7i01.215

Abstract

The development of compositionally multinutrient composite offers a promising pathway to overcome the limitations of conventional fertilizer systems that predominantly focus on N–P–K. In this study, a Ca–Si–K–P composite was synthesized via a controlled precipitation route utilizing carbide lime waste and rice husk ash as sustainable precursors. The effects of precipitation pH (7–11) and calcination temperature (600–1000 °C) on oxide composition and yield were systematically investigated. The results demonstrate that increasing pH from 7 to 11 significantly enhances CaO content, reaching its optimum at pH 9–11, while SiO₂ content decreases by up to ~20–30% under highly alkaline conditions due to increased silicate solubility. The K₂O fraction remains relatively low (<10 wt%) across all conditions, primarily due to dissolution losses and thermal volatilization, whereas P₂O₅ exhibits minor variation (<5 wt%) within the studied pH range. Increasing calcination temperature from 600 to 1000 °C leads to a relative increase in SiO₂ content by approximately 10–15%, accompanied by a decrease in CaO fraction and partial loss of K₂O and P₂O₅ at temperatures ≥900 °C. The product yield exceeds 100% due to KOH addition during pH adjustment and shows a decreasing trend with temperature, dropping by approximately 10–20% from 600 to 1000 °C as a result of dehydration and decarbonation processes. Overall, alkaline precipitation conditions (pH 9–11) combined with moderate calcination temperatures (700–800 °C) provide the most favorable balance between compositional homogeneity and yield. These findings highlight the potential of waste-derived resources and precipitation engineering in producing composition controlled Ca–Si–K–P composites, offering significant prospects for application as advanced multinutrient fertilizer precursors.
Synthesis and Characterization of Submicron Hydroxyapatite from Calcium Nitrate Tetrahydrate: Implications of pH Variations in the Precipitation Process Devi Diyah Ayu Prameswari; Chaterine Oktavia Anggaraeni; Luluk Edahwati; Sri Redjeki; Shinta Soraya Santi
Jurnal Kimia Sains dan Aplikasi Vol 28, No 7 (2025): Volume 28 Issue 7 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.7.368-373

Abstract

Hydroxyapatite (HAp) is the primary mineral component of bone and tooth tissue. Submicron-sized HAp offers enhanced osteoconductive properties, enabling it to serve effectively as a scaffold to support osteoblast activity and new bone formation. In this study, HAp was synthesized from calcium nitrate tetrahydrate using the precipitation method. The main variable investigated was the pH, adjusted by the addition of ammonium hydroxide, which influenced the yield and Ca/P ratio of the resulting HAp. The synthesized HAp was characterized using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Atomic Absorption Spectroscopy (AAS Flame), UV-Vis spectrophotometry, and X-Ray Diffraction (XRD). The optimal HAp product was obtained at pH 11 and sintered at 800 °C, yielding a Ca content of 2.56% and a P content of 4.28%, resulting in a Ca/P ratio of 1.6719; consistent with the theoretical stoichiometric value of 1.67. This was supported by XRD analysis, which showed the highest intensity peak at 2θ = 31.74°, confirming the presence of hydroxyapatite. SEM analysis revealed a particle size of 460.8 nm and a porosity of 20.15%. These findings demonstrate that hydroxyapatite can be successfully synthesized via precipitation using calcium nitrate tetrahydrate under optimal conditions of pH > 11.
Role of pH and Kepok Banana Peel Pectin in ?--Tricalcium Phosphate Formation from Windowpane Oyster (Placuna placenta) Shells Muhammad Taqiyyuddin; Fransisca Adya Zahiroh; Luluk Edahwati; Nur Ikhtiarini; Srie Muljani; Reva Edra Nugraha
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 3 (2026)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v10i3.1137

Abstract

?--tricalcium phosphate (?--TCP) has potential as a bone material because it is biodegradable, biocompatible, bioresorbable, and osteoconductive. This study aims to synthesize ?-tricalcium phosphate (?-TCP) from windowpane oyster shells and to determine the effect of adding kepok banana peel pectin on particle size and pH on the Ca/P ratio. Synthesis was performed with pH variations ranging from 9 to 11 and pectin concentrations of 0.08-0.16%, using a sintering time of 3 hours at 1100ºC via the precipitation method. The resulting ?-tricalcium phosphate was characterized using XRF, FTIR, XRD, and SEM analyses. XRF results showed that variations in pH and pectin concentration affected the Ca/P ratio. All samples had a Ca/P ratio higher than the ?-TCP standard (1.5). XRD analysis revealed the formation of peaks identical to the JCPDS ?-TCP standard no. 09-0169. However, the formation of calcium pyrophosphate (CPP), hydroxyapatite (HAp), and calcium oxide (CaO) phases was also observed in the results of this study. XRD analysis yielded an average crystal size of 37.48 nm and a degree of crystallinity of 53.55%. FTIR results for all samples showed characteristic phosphate group bands consistent with the ?-TCP phase. SEM characterization showed that at pH 10 with the addition of 0.12% pectin, the morphology ranged from semi-spherical to granular with relatively uniform particle size and low agglomeration, with an average particle size of 1.8237 ?m and a PDI of 0.08. The sample at pH 10 and a concentration of 0.12% exhibited the highest crystallinity and the smallest particle size. Although the Ca/P ratio did not meet the standard, it was 2.03, the XRD and FTIR test results confirmed the presence of phases and groups identical to those found in ?-TCP. Contribution to Sustainable Development Goals (SDGs):SDG 3: Good Health and Well-BeingSDG 9: Industry, Innovation, and InfrastructureSDG 12: Responsible Consumption and ProductionSDG 13: Climate ActionSDG 14: Life Below Water
Effect of In Situ Gelatin Addition on Synthesis and Characteristics of Limestone Based Hydroxyapatite using Sol-Gel Method Nazila Alfi Rahmah; Mohammad Rafli Alif Wahyudi; Luluk Edahwati
TEKNIK Vol 46, No 3 (2025)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i3.67466

Abstract

Hydroxyapatite (HAp) is a major component of bone and tooth tissues used to repair and rebuild malfunctioning bone. Hydroxyapatite synthesis widely utilizes materials that have a high calcium content. In this study, limestone was used as an economical calcium precursor. Gelatin was added in situ during the sol-gel process to improve biomechanical properties such as porosity and reduce 5the particle size. The variables used during hydroxyapatite synthesis were gelatin concentrations of 30%, 40% and 50% with pH variations of 10, 11 and 12. The best yield was 30% gelatin concentration with pH 12. HAp products were characterized using Fourier Transform Infra-Red (FTIR) to confirm that there are core functional groups that compose hydroxyapatite, namely PO43-, CO(3)(2-)and OH-. SEM-EDX analysis revealed granular crystal morphology with particle dimensions below 600 nm and the highest porosity of 60.73% at pH 10. These results indicate that the in situ addition of gelatin during the sol-gel process successfully produced hydroxyapatite with biomechanical properties suitable for implant applications, especially in teeth, with optimal porosity and adequate particle size to support cell growth.
Peningkatan Literasi Energi Terbarukan melalui Edukasi Panel Surya pada Siswa SMP Negeri 8 Probolinggo Rizqa Ruviana; Luluk Edahwati; Musyaroh Musyaroh; Tria Puspa Sari; Fatkhurrohman Fatkhurrohman; M Danny Pratama Lamura; Anisah Nurul Izzah
Publikasi Pendidikan Vol 16, No 2 (2026)
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70713/publikan.v16i2.82850

Abstract

Low renewable energy literacy among students remains a challenge in supporting energy transition and sustainable development. This community service program aimed to improve renewable energy literacy through solar panel education and training for students at SMP Negeri 8 Probolinggo. A quantitative descriptive approach with a pretest posttest design was employed. The program involved 30 ninth grade students who participated in interactive workshops on renewable energy concepts, counseling on the role of green energy in reducing carbon emissions, and hands-on practice in basic solar panel installation and maintenance. Program outcomes were evaluated using a five-point Likert-scale questionnaire consisting of 20 statements grouped into seven assessment parameters. The results showed consistent improvements across all parameters, with percentage increases ranging from 10.7% to 39.3%. The highest improvement was observed in the maintenance and evaluation of solar panels, while the lowest increase occurred in students’ attitudes toward supporting renewable energy. These findings indicate that practice-based educational interventions are effective in enhancing students’ knowledge, basic technical skills, and environmental awareness. This program contributes to the achievement of Sustainable Development Goals, particularly SDG 4 (Quality Education), SDG 7 (Affordable and Clean Energy), and SDG 13 (Climate Action).
Balancing Mechanical Properties, Water Resistance, and Soil Degradability of Rice Flour/CMC-Based Biodegradable Drinking Straws Alya Keisha Intan Chayrunisya; Qanitah Nibras Firmaniya; Srie Muljani; Luluk Edahwati; Caecilia Pujiastuti
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The development of biodegradable drinking straws requires a balance between mechanical integrity, flexibility, water resistance, and post-use degradability. This study investigated the effects of rice flour-to-carboxymethyl cellulose (CMC) ratio and plasticizer conditions on the functional performance of biodegradable drinking straws. Five rice flour:CMC ratios (1:3, 1.5:2.5, 2:2, 2.5:1.5, and 3:1) were combined with two plasticizers (glycerol and sorbitol) at three loadings (1.5, 2.0, and 3.0 mL), resulting in 30 formulations. The resulting straws were evaluated for tensile strength, elongation at break, water resistance, and soil-burial degradation. Tensile strength ranged from 0.588 to 3.822 MPa, with the highest value obtained at a rice flour : CMC ratio of 1:3 containing 1.5 mL sorbitol. Elongation at break ranged from 12.545 to 88.964%, with the maximum achieved at a ratio of 3:1 containing 2.0 mL glycerol, demonstrating a clear strength–flexibility trade-off. Water resistance varied from 25 to 74%, while soil-burial mass loss reached 86.2–100% after 21 days. The different formulations maximizing tensile strength, flexibility, and water resistance indicate that plasticizer performance is strongly dependent on matrix composition rather than plasticizer identity alone.   
Synthesis and Characterization of Calcium Peroxide from Eggshell Waste as a Citric Acid Potential Adsorbent Material Sulaiman, Yusri Risyad; Joanne Rizma Pramitha; Luluk Edahwati; Muljani, Srie; Susilowati
Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) Volume 19, No 1: June 2026
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/ta9jfg36

Abstract

This study presents a sustainable approach for synthesizing calcium peroxide (CaO₂) nanoparticles from biogenic eggshell waste as a potential adsorbent for wastewater treatment. Increasing water pollution caused by industrial and domestic activities has driven the demand for low-cost and environmentally friendly adsorbents. In this study, eggshells from various poultry sources were calcined at 900°C to produce CaO, followed by hydration and chemical precipitation using H₂O₂ to synthesize CaO₂. The resulting materials were dried at different temperatures (60–100°C) to evaluate the effect of thermal treatment on structural properties and adsorption performance. X-ray diffraction (XRD) analysis confirmed the formation of CaO₂ with nanoscale crystallite sizes ranging from 15.3 to 28.85 nm. Brunauer–Emmett–Teller (BET) analysis showed specific surface areas between 10.18 and 19.67 m²/g. Adsorption experiments using acetic acid revealed that performance was significantly influenced by precursor type and drying temperature. The highest adsorption capacity (347.54 mg/g) and removal efficiency (34.75%) were achieved using CaO₂ derived from free-range chicken eggshells at 80°C. This enhanced performance is attributed to the natural biogenic structure, mineral composition, and pore distribution. Overall, eggshell waste is a promising, sustainable, and cost-effective precursor for producing high-performance CaO₂ nanoparticles for wastewater treatment
Co-Authors A. Khanifah Achmad Fanani Adeniah Setiabudi Adiman, Thareq Muhammad Fathan Agung F. Kulianto Ahmad Khairul Faizin Ahmad Khairun Faizin Alya Keisha Intan Chayrunisya Andini, Atika Anggriawan, Rizqi Rendri Aninda Ikaputri Anisah D. Ramadhani Anisah Nurul Izzah Aprilianty, Syasmitha Lucky Ardiza, R.Muhammad Rizky Atika Andini Ayu Fakhira Yuliananda Bayu Sastra Dewangga Caecilia Pujiastuti Chaterine Oktavia Anggaraeni Devi Diyah Ayu Prameswari Dewangga, Bayu S. Dewi Maya Maharani Dian Nuraini Dita Prariesta DWI LESTARI, WAHYU Dyah Siswanti Dyah Suci Perwitasari Edahwati, Wahyu Dwi Lestari Erwan Adi Saputro Faizin, Ahmad Khairul Falah, Ra Niyatul Fatkhurrohman Fatkhurrohman Fauziah Hilda Alvira Fauziah Hilda Alvira Fauziah, Maria Rizky Ferdi Kurniawan Feriyanto, Ahmad Fransisca Adya Zahiroh Gobel, Fendy Faizal Harya, Gyska Indah Herdiana Septiani Herdiana Septiani Ika Nawang Puspitawati Ikaputri, Aninda Indah N. F. Indah Nur Fauziyah Issafira, Radissa Dzaky Jayan Sentanuhady Joanne Rizma Pramitha Kalimatus S Kartika Pratiwi Kurniawan, Ferdi L.Urip Widodo, Yohandrik Novel Karaman Lusy Larasati A Lusy Larasati A M Danny Pratama Lamura Maria Rizky Fauziah Maria Vindri Vincensia Saru Moch Miftakhurrohman Mochammad Alief Setyanugraha Moh Nur Fuadzi Mohammad Rafli Alif Wahyudi Mr. Sutiyono Muhammad Ikhsan Muhammad Taqiyyuddin Munandar, Siswanto Musyaroh, Musyaroh Mutiya Zevi Nana Dyah Siswati, Anwar Zain and Mohammad Nandini, Atika Nazila Alfi Rahmah Ndaru Adyono Ndaru Adyono Ndaru Adyono Ndaru Adyono, Ndaru Nikmatuz Zahra Nikmatuz Zahra Novel Karaman Novel Karaman Nur Fuadzi, Moh Nur Ikhtiarini Prayoga, Ferdiyan Tri Puspa Sari, Tria Qanitah Nibras Firmaniya Ra Niyatul Falah Radissa Dzaky Issafira Radissa Dzaky Issafira Radissa Dzaky Issafira Radissa Dzaky Issafira Radissa Dzaky Issafira Radissa Dzaky Issafira Radissa Dzaky Issafira Rahmah, Nazila Alfi Rahmaniar Naulita Hutagalung Reva Edra Nugraha Reyhan Firmansyah Rifaldo Pido Rizaldi, Ryan Rizqa Ruviana Rizqa Ruviana Rizqi Rendri Anggriawan Rizqi Rendri Anggriawan Rizqi Rendri Anggriawan S D Nurherdiana S Sutiyono S, Sutiyono Sari, Tria Puspa Saru, Maria Vindri Vincensia Setyanugraha, Moch. Alief Shinta Soraya Santi Siti Robiatuz Zahrotun Nukhuf Soemargono Soemargono Sri Muljani Sri Redjeki Srie Muljani SRIE MULJANI Srie Muljani Srie Muljani Suhaili Sulaiman, Yusri Risyad Suprihatin Susilowati Susilowati MT Susilowati Susilowati Sutiyono Sutiyono . sutiyono sutiyono Sutiyono Sutiyono Titi Susilowati Tria Puspa Sari Tutuk Harsini Wahyu Dwi Lestari Wahyu Dwi Lestari Wahyu Dwi Lestari Edahwati Wahyudi, Mohammad Rafli Alif Widya Wijayanti Wiliandi Saputro Wiliandi Saputro Wiliandi Saputro Wiliandi Saputro Wiliandi Saputro Wiliandi Saputro Wiliandi Saputro Willie Prasidha Zevi, Mutiya