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All Journal Rekayasa Mesin Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat AGRITEPA: Jurnal Ilmu dan Teknologi Pertanian Jurnal IPTEK Konversi 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 G-Tech : Jurnal Teknologi Terapan 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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Synthesis and Characterization of Magnesium Oxide from Salt Waste (Bittern) Amelia, Rizkyquina Arsya; Hastuti, Listyorini; Pujiastuti, Caecilia
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 1 (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.v10i1.868

Abstract

Salt waste (bittern) is a byproduct of the salt processing industry that is rich in magnesium, but is often not optimally utilized and is discharged into the environment. This study aims to produce magnesium oxide (MgO) from salt waste through a synthesis and characterization process. The synthesis process begins with the precipitation of magnesium hydroxide (Mg(OH)2) using sodium hydroxide (NaOH), which is then calcined at various temperatures and times to convert it to MgO. The calcination temperature variations used include 300–700°C, and calcination times between 2 and 6 hours. Product characterization was carried out using the XRF method for chemical composition analysis, XRD to determine the crystal structure, and SEM to observe particle morphology. The results showed that calcination temperature and time have a significant effect on MgO formation. The optimal temperature to produce the highest MgO is 500°C, with the best calcination time of 3 hours. Under these conditions, the resulting MgO has a crystal size of approximately 42 nm and a uniform and porous particle morphology. This research proves that salt waste has great potential to be utilized as a raw material for magnesium oxide, which not only reduces environmental pollution but also provides economic added value. Contribution to Sustainable Development Goals (SDGs):SDG 9: Industry, Innovation, and InfrastructureSDG 12: Responsible Consumption and ProductionSDG 14: Life Below Water
Penurunan Kadar Pb dan Cd dengan Metode Ion exchange Secara Batch dengan Recycle pada Limbah Cair Industri Cat Nur Suroya, Nala; Anataya Putri Azzahra, Firliandiva; Pujiastuti, Caecilia; Panjaitan, Renova
Jurnal Serambi Engineering Vol. 11 No. 2 (2026): April 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Limbah cair merupakan sisa buangan dalam suatu proses yang tidak digunakan lagi. Limbah cair tersebut tidak boleh dibuang sembarangan. Terdapat baku mutu yang mengatur kadar maksimal dalam pembuangan limbah cair. Pengolahan limbah cair perlu dilakukan agar data memenuhi baku mutu tersebut, salah satunya menggunakan metode ion exchange. Metode ion exchange dapat menurunkan kadar logam berat dalam suatu limbah cair. Logam berat tersebut memiliki efek toksik jika terakumulasi dalam tubuh makhluk hidup. Ion exchange menggunakan resin penukar ion untuk menukar logam berat seperti timbal dan kadmium. Resin yang digunakan dalam penelitian adalah resin kation asam kuat Trillite KH 80. Untuk memaksimalkan pertukaran ion variabel yang dijalankan yaitu tinggi resin, laju alir dan recycle. Tinggi resin yang digunakan secara berturut turut 20; 24; 28; 32; 36 cm yang akan dimasukkan dalam kolom penukar ion dengan diameter 7 cm. Laju alir yang digunakan dalam mengalirkan limbah cair yaitu 60; 70; 80; 90; 100 mL/menit. Recycle dilakukan sebanyak 1-3 kali. Logam berat yang diamati yaitu timbal dan cadmium. Hasil penelitian menunjukkan tinggi resin 36 cm, laju alir 60 mL/menit dengan recycle 3 kali merupakan hasil terbaik. Kadar akhir timbal yang didapat sebesar 1,3 mg/L dan kadar akhir cadmium sebesar 0,03 mg/L.
Synthesis of Calcium Phosphate from Snail Shell Waste Using the Hydrothermal Method Rochman, Ananda Arif; Rahman, Nazila Aulya; Sani, Sani; Pujiastuti, Caecilia; Puspitawati, Ika Nawang
G-Tech: Jurnal Teknologi Terapan Vol 10 No 2 (2026): G-Tech, Vol. 10 No. 2 April 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i2.9325

Abstract

The utilization of biowaste as an alternative raw material has attracted increasing attention in biomaterial research. Snail shell waste, which is abundant and underutilized, contains a high calcium carbonate content and offers a unique, low-cost, and sustainable precursor for calcium phosphate synthesis, particularly for bone substitute applications. This study aimed to synthesize calcium phosphate from snail shell waste using the hydrothermal method and to evaluate the effects of pH and hydrothermal time on phase formation, purity, and particle size. The shells were calcined at 800 °C for 4 hours to produce calcium oxide (CaO), then reacted with phosphoric acid at pH 8–12 under hydrothermal conditions for 25–125 minutes. The precipitates were dried and sintered at 1000 °C for 5 hours. X-ray fluorescence analysis showed a CaO content of 99.20%. X-ray diffraction revealed calcium hydrogen phosphate, hydroxyapatite, and calcium carbonate phosphate hydroxide phases. The highest hydroxyapatite content (54%) was obtained at pH 8 and 25 minutes. Higher pH and longer processing time reduced purity. Scanning electron microscopy showed granular morphology, with particle sizes decreasing from 63 nm to 28 nm as pH increased. Although promising, the hydroxyapatite content does not yet meet RSNI3 ISO 13175-3:2012 requirements.
Co-Authors Achmad Rizal Afandi, Fadila Ardiansyah Aisyah Alifatul Zahidah Rohmah Alwansyah, Yuki Amru Amanda, Nabila Ayu Amelia, Rizkyquina Arsya Anataya Putri Azzahra, Firliandiva Angelia Tantyono Anggoro, Achmad Rahditya Viman Anggraeni, Verendria Putri Caesar Annisa Anwar, Miranda Anugerah Dany Priyanto, Anugerah Dany Arianti, Rahma Dea Rerindra Arief S, Purwanto Aththobarani, Muhammad Daffa' Azka, Salsabilla Betafachreza, Aditya Fadhilaskha Egita Yulisningtyas Erfani, Rif’atul Firda Erlinda, Riska Melati Erliyanti, Nove Erliyanti, Nove Kartika Fajrin, Alifah Nur Aini Fernanda, Moza Ayu Hafiza, Putri Nur Hamzah, Maditya Amirul Hastuti, Listyorini Hidayah, Bimantara Ika Nawang Puspitawati Ira Pareira Ketut Sumada Kusuma, Prasdinata Meidaus Lisa Rizky Amalia Luqman Agung Wicaksono M. Ghufron Chakim Maharani, Hijria Putri Monica, Clarissa Putri Muchamad, Raka Selaksa Charisma Muhammad Septianto Nana Dyah Siswati, Anwar Zain and Mohammad Ni Ketut Sari Nofitasari, Luluk Nova Triani Novianah, Delia Indah Nur Suroya, Nala Panjaitan, Legipson Panjaitan, Renova Pertiwi, Beta Cahaya Pradana, Alfian Rizki Puput Srianah, Puput Srianah Putra, Andre Yusuf Trisna Putra, Boni Mulia Putri, Megawati Setiawan Rachmawati, Fadiatul Rahman, Nazila Aulya Rochman, Ananda Arif Royyan, Irham Alva Sani Soemargono Soemargono SRIE MULJANI Suprianti, Lilik Suprihatin Syahrani, Alza Nadilla Trianna, Nurul Widji Wicaksono, Akhmad Permadi Widya P, Vika Wira, Guardiola Rosa Yustina Ngatila Yustina Ngatilah Zain, Tama Rahmandha