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All Journal Rekayasa Mesin Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Journal of Research and Technology IJEMS (Indonesian Journal of Environmental Management and Sustainability) Chemistry Indonesian Journal of Chemical Research ASEAN Journal of Community Engagement Abdimasku : Jurnal Pengabdian Masyarakat Nusantara Science and Technology Proceedings Community Empowerment Envirous AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Pengbdian Teknik Mesin Madani: Jurnal Pengabdian Masyarakat dan Kewirausahaan Journal Serambi Engineering (JSE) JURNAL REKAYASA KIMIA & LINGKUNGAN
Pujiastuti, Caecilia
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Ultrasound Microwave Assisted Extraction On Citronella Leaves Using Ionic Solvent: Ultrasound Microwave Assisted Extraction Pada Daun Serai Wangi Menggunakan Pelarut Ionik Wicaksono, Akhmad Permadi; Afandi, Fadila Ardiansyah; Pujiastuti, Caecilia; Erliyanti, Nove Kartika; Panjaitan, Renova
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 8 No. 1 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2024.008.01.06

Abstract

Leaves of citronella (Cymbopogon nardus L.) have pretty much essential oil. Essential oil from citronella leaves is generally extracted by conventional methods. Conventional method is still less effective. The problem can be overcome by using non-conventional methods in the form of UMAE (Ultrasound-Microwave Assisted Extraction). UMAE is an extraction process assisted by ultrasound and microwaves. NaCl solution can be used as a solvent in the UMAE method because NaCl has a large dielectric constant. The aim of this study was to examine the effect of extraction time and the addition of salt on the yield and color of essential oils produced using the UMAE. The extraction process begins with the raw material preparation stage, such as harvesting, size reduction, and drying. Then, pre-treatment was carried out using ultrasound for 5 minutes at 35oC with the addition of 2, 4, 6, 8, and 10% (w/v) salt. Pre-treatment results were followed by the extraction process using microwaves for 30, 45, 60, 75, and 90 minutes. The best results were obtained with the addition of 6% salt and 60 minutes of extraction time with a feed to solvent ratio of 0.1 with a yield of 1.975%. and the color is yellow.
Pengaruh Laju Alir Terhadap Penurunan Kadar Logam Berat Cr pada Limbah Industri Batik dengan Metode Ion Exchange Menggunakan Resin Amberlite IR 120Na Panjaitan, Legipson; Putri, Megawati Setiawan; Pujiastuti, Caecilia
Envirous Vol. 4 No. 1 (2023): Jurnal Envirous
Publisher : UPN "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/envirous.v4i1.149

Abstract

Proses pembuatan batik melewati beberapa tahap, salah satunya adalah tahap pewarnaan. Pewarna yang digunakan adalah pewarna sintetik yang tahan terhadap degradasi dan mengandung logam berat, sehingga pembuangan limbah industri batik menyebabkan pencemaran lingkungan. Oleh karena itu, diperlukan upaya untuk mengurangi kandungan logam berat pada limbah industri batik untuk mengurangi potensi pencemaran lingkungan. Ion Exchange adalah teknik untuk memisahkan berbagai campuran ion atau molekul yang dapat terionisasi. Ion-ion ini bersaing dengan ion fase gerak untuk berikatan dengan fase diam. Pada penelitian ini limbah dari industri batik digunakan sebagai sampel yang diukur kandungan logamnya dan penukar ion digunakan resin Amberlite IR 120Na. Pada penelitian ini digunakan pompa untuk mengalirkan sampel melalui kolom penukar ion dengan ketinggian resin 20 cm menggunakan variasi laju alir 50 ml/menit. 100 mL/menit; 150 mL/menit; 200 mL/menit; dan 250 mL/menit. Limbah yang sudah melewati kolom penukar ion diukur kadar logam Cr yang tersisa. Kondisi terbaik penurunan logam Cr diperoleh pada laju alir 50 ml/menit, laju reduksi logam Cr mencapai 97,33%. Kandungan logam hasil Cr setelah proses ion exchange memenuhi baku mutu.
Pembuatan Pupuk Kalsium Nitrat Dengan Bahan Baku Cangkang Telur Ayam Dan Asam Nitrat Hamzah, Maditya Amirul; Zain, Tama Rahmandha; Sumada, Ketut; Pujiastuti, Caecilia
Envirous Vol. 4 No. 1 (2023): Jurnal Envirous
Publisher : UPN "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/envirous.v4i1.151

Abstract

Cangkang Telur Ayam sebagai bahan baku utama karena ketersediaanya melimpah dan cangkang telur ayam banyak mengandung kalsium karbonat. Pada penelitian ini yang berjudul Pembuatan Pupuk Kalsium Nitrat dengan menggunakan cangkang telur ayam dan Asam Nitrat yang bertujuan untuk mendapatkan Pupuk Kalsium Nitrat yang memenuhi Standar Nasional Indonesia dan untuk menentukan pengaruh volume asam nitrat dan waktu reaksi terhadap kualitas Pupuk Kalsium Nitrat. Hasil penelitian ini volume dan waktu reaksi berpengaruh pada hasil Pupuk Kalsium Nitrat yang dihasilkan dimana semakin banyak volume asam nitrat yang ditambahkan maka semakin banyak juga cangkang telur ayam yang bereaksi maka kadar kalsium pada pupuk juga besar. Pengaruh waktu reaksi pada penelitian ini yaitu jika semakin lama waktu reaksi maka kadar nitrat pada Pupuk Kalsium Nitrat akan semakin besar sedangkan kadar kalsium pada Pupuk Kalsium Nitrat akan semakin kecil. Kesimpulan dari penelitian ini yaitu hasil Analisa XRF menunjukan bahwa kandungan kalsium karbonat pada cangkang telur ayam yaitu 91.2%. Pada penelitian ini juga di dapatkan kondisi terbaik dengan kondisi waktu reaksi 50 menit dan volume asam nitrat sebagai pelarut 30 ml yaitu kadar kalsium sebesar 82% dan kandungan nitrat 9.1%. Dari hasil tersebut Pupuk Kalsium Nitrat belum memenuhi Standart Nasional Indonesia (SNI) terutama pada kandungan nitrat.
Synthesis and Characterization of Calcium Phosphate Using Two Stages of Process Anggoro, Achmad Rahditya Viman; Arianti, Rahma Dea Rerindra; Pujiastuti, Caecilia; Sumada, Ketut; Muljani, Srie
Jurnal Rekayasa Kimia & Lingkungan Vol 19, No 1 (2024): Jurnal Rekayasa Kimia & Lingkungan (June 2024 )
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v19i1.37829

Abstract

Calcium phosphate, a naturally occurring biomaterial found in human and animal bones and teeth, possesses desirable properties such as strength, biocompatibility, and the ability to stimulate tissue growth. This study investigates the synthesis of calcium phosphate through a precipitation method without calcination. The process involves dissolving raw materials in phosphoric acid, followed by precipitation using KOH as the precipitating agent. The resulting precipitate was then calcined for 3 hours. The calcium phosphate product was characterized using XRF, XRD, and SEM-EDX techniques. The results indicate a Ca-P molar ratio ranging from 1.855 to 2.302, with the predominant phase identified as -calcium pyrophosphate. SEM analysis reveals a plate-like morphology with agglomerated particles ranging in size from 888 nm to 7.79 m. The synthesized calcium phosphate holds potential for various biomedical applications due to its unique properties and composition.
Modernization of hydroponic farming using rice husk for community food security in Karang Langit, Lamongan Pujiastuti, Caecilia; Muchamad, Raka Selaksa Charisma; Rohmah, Aisyah Alifatul Zahidah; Chakim, M. Ghufron; Fajrin, Alifah Nur Aini; Rizal, Achmad; Azka, Salsabilla
Community Empowerment Vol 10 No 8 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.14476

Abstract

Rice husk waste is an abundant agricultural byproduct in Karang Langit Village, Lamongan, but its utilization is still limited, posing a potential environmental problem. This community service program aims to modernize agricultural practices by utilizing rice husk as a hydroponic growing medium to support food security and promote a circular economy. The methods applied include community coordination, carbonization of rice husks, preparation of the hydroponic system, and both theoretical and practical hands-on training. Evaluation results show a significant increase in participants’ knowledge by 32%. A total of 85% of participants successfully prepared a viable rice-husk-based growing medium, and 75% were able to cultivate and harvest leafy vegetables in the trial phase. Additionally, a farmer group was formed and is committed to independently continuing hydroponic practices after the program’s conclusion. These results confirm that utilizing rice husk as a hydroponic medium not only enhances community skills and self-sufficiency but also opens new economic opportunities. This model is recommended for replication in other agricultural areas to support local food security and environmental sustainability.
Synthesis of Cellulose Nanocrystals from Rice Husk Using Nitric Acid Hydrolysis Fernanda, Moza Ayu; Novianah, Delia Indah; Siswati, Nana Dyah; Pujiastuti, Caecilia
Indonesian Journal of Chemical Research Vol 13 No 2 (2025): Edition for September 2025
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2025.13-moz

Abstract

Rice husk residue has excellent potential as a raw material for making cellulose nanocrystals because of its relatively high cellulose content. This research focuses on determining the most effective hydrolysis conditions, especially the reaction time and nitric acid (HNO₃) content, in the synthesis of cellulose nanocrystals. This study also aims to determine the effect of variations in nitric acid concentration and hydrolysis time on the amount of product produced (yield) and the final size of cellulose nanocrystals. The process of making these nanocrystals involves three main stages, namely the removal of lignin using a 17,5% NaOH solution, followed by annealing using a 10% H₂O₂ solution, and finally breaking the cellulose bonds (acid hydrolysis) with a concentrated nitric acid solution of between 2% and 6% for different time periods (30 to 15 minutes). Product characterization using FT-IR and SEM has been carried out to confirm the presence of cellulose and determine the size of the nanocrystals formed. Experimental results show that the smallest cellulose crystal size achieved is between 0,93 to 65,10 μm, which was obtained through hydrolysis using 6% nitric acid for 150 minutes.
Recovery of Silica from Steel Slag Waste Using Extraction and Acid Precipitation Methods Betafachreza, Aditya Fadhilaskha; Putra, Boni Mulia; Pujiastuti, Caecilia
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 9 No. 3 (2025)
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.v9i3.793

Abstract

Steelmaking processes generate large amounts of slag waste that contain silica, which can be recovered and converted into valuable products. In this study, silica (SiO?) was extracted from steel slag waste through alkaline extraction using sodium hydroxide (NaOH) followed by acid precipitation. The experimental parameters included NaOH concentrations of 0.5, 1.0, 1.5, 2.0, and 2.5 M, and extraction temperatures of 60, 70, 80, 90, and 100 °C. Each extraction was carried out for 60 minutes with continuous stirring at 300 rpm. The X-ray diffraction (XRD) analysis confirmed that the product exhibited a broad peak at 2? around 20–30°, which is characteristic of amorphous silica. The results indicated that both NaOH concentration and temperature had a positive correlation with silica yield. As the NaOH concentration and extraction temperature increased, the percentage of extracted silica also increased. The optimum condition was achieved at 100 °C and 2.5 M NaOH, yielding silica with a purity of 91.10%. These findings highlight the potential of utilising steel slag waste as a low-cost raw material for producing amorphous silica. Furthermore, the process demonstrates a sustainable approach to waste valorization while providing high-purity silica for potential applications in industrial materials, adsorbents, and nanotechnology. Contribution to Sustainable Development Goals (SDGs):SDG 12: Responsible Consumption and ProductionSDG 13: Climate ActionSDG 15: Life on Land
Study on the Effectiveness of CO2 Absorption in Biogas Purification Using Bittern and Alkaline Solutions Hafiza, Putri Nur; Amalia, Felisa Rizky; Suprihatin; Pujiastuti, Caecilia; Triana, Nurul Widji
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 9 No. 3 (2025)
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.v9i3.801

Abstract

Biogas is a renewable energy source with great potential to replace fossil fuels; however, the presence of CO? and H?S reduces its quality and combustion efficiency, making purification necessary. This study aimed to evaluate the effectiveness of CO? absorption using Bittern and alkaline solutions (3N KOH, 3N NaOH) with absorbent volumes ranging from 600 to 1000 ml. The absorption process was carried out in a bubble column, and the gas composition was analyzed using an Orsat apparatus and titration method. The results indicated that increasing absorbent volume reduced CO? concentration to 10–15% and H?S to below 1.2%, while increasing CH? content to more than 80%, in accordance with SNI 8019:2014 biogas standards. Stepwise absorption (Bittern–KOH/NaOH) was more effective than single absorbents, yielding up to 87% CH? and reducing CO? to 10%. XRF analysis of the precipitate showed calcium (84.58%) and magnesium (14%) dominance, confirming carbonate and sulfate precipitation. These findings demonstrate that Bittern and alkaline solutions are effective absorbents for biogas purification, with stepwise absorption providing the most optimal improvement in biogas quality. Contribution to Sustainable Development Goals (SDGs):SDG 7: Affordable and Clean EnergySDG 13: Climate Action
Inovasi Kemasan Produk Kerupuk Kulit Kopi di Desa Galengdowo, Kabupaten Jombang Royyan, Irham Alva; Pujiastuti, Caecilia
ABDIMASKU : JURNAL PENGABDIAN MASYARAKAT Vol 7, No 1 (2024): JANUARI 2024
Publisher : LPPM UNIVERSITAS DIAN NUSWANTORO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62411/ja.v7i1.1910

Abstract

Usaha Mikro Kecil dan Menengah (UMKM) merupakan sektor ekonomi yang sangat penting bagi negara, karena berperan sebagai tulang punggung perekonomian yang menyangkut kehidupan banyak orang. Salah satu tantangan yang dihadapi UMKM adalah kurangnya sumber daya dan pengetahuan untuk mengembangkan desain kemasan yang menarik dan fungsional. Kemasan memiliki peran penting dalam menentukan harga jual serta citra dari produk. Harga jual meningkat saat kemasannya menarik, dan citra produk menjadi lebih baik di mata konsumen jika dikemas dengan baik. Metode pengabdian kepada masyarakat ini meliputi survei, wawancara, dan analisis data untuk mengumpulkan informasi tentang praktik produksi kerupuk kulit kopi di Desa Galengdowo serta persepsi konsumen terhadap kemasan produk. Hasil penelitian menunjukkan bahwa inovasi kemasan yang fokus pada aspek estetika, keamanan pangan, dan fungsionalitas dapat menjadi strategi efektif untuk meningkatkan daya saing produk. Studi ini dapat menjadi acuan bagi pelaku industri kecil dan menengah di sektor serupa untuk mengoptimalkan inovasi kemasan produk guna meningkatkan daya saing dan nilai tambah produk lokal.
KINETIKA REAKSI PEMBENTUKAN TRIKALSIUM PHOSPHATE (Ca3(PO4)2) DARI KALSIUM KARBONAT BERBAHAN BAKU CANGKANG KUPANG PUTIH Pujiastuti, Caecilia; Nofitasari, Luluk; Erfani, Rif’atul Firda
Journal of Research and Technology Vol. 6 No. 1 (2020): JRT Volume 6 No 1 Jun 2020
Publisher : 2477 - 6165

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55732/jrt.v6i1.149

Abstract

The development of the health sector to search alternatife material bone’s repair is increasing. Bone is a natural composite containing 60% minerals, 30% matrix, and 10% water. The component of bone mineral is calcium phosphate. Tricalcium phosphate is the type of calcium phospate that used because it has chemical component’s as like bone’s component. In this study, white mussel shell was chosen as a source of calcium and H3PO4 as a solvent. The aim of this research was determining reaction kinetics of tricalcium phospate synthesis from white mussel shells. The research was started by dissolving 50 grams of white mussel shell in 1 L of H3PO4 3% at reaction time with variation 2, 4, 6, 8, 10 minutes and reaction temparature with variation 40, 50, 60, 70, 80oC and then filtered. The filtrate was analyzed for the content of phosphoric acid while the residue was calcined at 900oC for 5 hours to remove the water. The reaction rate increased with increasing time and temperature. The highest phosphate acid conversion was obtained at a temperature of 80 ° C, with a reaction time of 10 minutes is 90.92%. The controlling step that controlled tricalcium phosphate synthesis from white mussel shell followed pseudo first-order equation with the Arrhenius equation.The results of XRD analysis found that89%of Ca3(PO4)2was formed.
Co-Authors Achmad Rizal Afandi, Fadila Ardiansyah Aisyah Alifatul Zahidah Rohmah Alifah Nur Aini Fajrin Amanda, Nabila Ayu Anataya Putri Azzahra, Firliandiva Angelia Tantyono Anggoro, Achmad Rahditya Viman Anggraeni, Verendria Putri Caesar Anugerah Dany Priyanto, Anugerah Dany Arianti, Rahma Dea Rerindra Arief S, Purwanto Azka, Salsabilla Betafachreza, Aditya Fadhilaskha Egita Yulisningtyas Erfani, Rif’atul Firda Erliyanti, Nove Erliyanti, Nove Kartika Fernanda, Moza Ayu Hafiza, Putri Nur Hamzah, Maditya Amirul Ira Pareira Ketut Sumada Kusuma, Prasdinata Meidaus Lisa Rizky Amalia M. Ghufron Chakim Monica, Clarissa Putri Muhammad Septianto Nana Dyah Siswati, Anwar Zain and Mohammad Ni Ketut Sari Nofitasari, Luluk Novianah, Delia Indah Nur Suroya, Nala Panjaitan, Legipson Pradana, Alfian Rizki Puput Srianah, Puput Srianah Putra, Boni Mulia Putri, Megawati Setiawan Rachmawati, Fadiatul Raka Selaksa Charisma Muchammad Renova Panjaitan Royyan, Irham Alva Soemargono Soemargono SRIE MULJANI Suprianti, Lilik Suprihatin Syahrani, Alza Nadilla Trianna, Nurul Widji Wicaksono, Akhmad Permadi Widya P, Vika Yustina Ngatila Yustina Ngatilah Zain, Tama Rahmandha