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Agus Jatmiko
Universitas Islam Negeri Raden Intan Lampung
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Transformation of Biogenic Calcium Carbonate from Waste Eggshells into Hydroxyapatite: A Comparative Study on Crystallographic Characteristics Agus Jatmiko; Rani Nopriyanti; Dewi Idamayanti; Moch. Wisnu Arif Sektiono; Gita Novian Hermana
Jurnal Bahan Alam Terbarukan Vol. 15 No. 1 (2026): June 2026 [Nationally Accredited Sinta 3]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v15i1.39698

Abstract

Hydroxyapatite (HAp) is a calcium phosphate–based biomaterial that has been widely applied in biomedical fields due to its excellent bioactivity and biocompatibility. In this study, HAp was synthesized using a wet chemical precipitation method by utilizing eggshell waste as a calcium source, aiming to develop a sustainable and cost-effective synthesis route. The synthesized products were investigated under two different conditions, namely without calcination and with calcination at 900 °C, in order to evaluate the effect of thermal treatment on the structural and microstructural characteristics of HAp. Phase formation and crystal structure were analyzed using X-ray diffraction (XRD), while surface morphology and elemental composition were examined using scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). XRD results confirmed the formation of hydroxyapatite with a hexagonal crystal structure, and calcination treatment led to sharper diffraction peaks, indicating an improvement in crystallinity. SEM observations revealed that the synthesized HAp particles exhibited irregular shapes with a tendency to agglomerate, which is commonly observed in HAp produced via wet chemical precipitation. EDS analysis verified the presence of the main constituent elements, Ca, P, and O, with a Ca/P atomic ratio of 1.67, which is in good agreement with the theoretical stoichiometric value of hydroxyapatite. Crystallite size was evaluated using several XRD-based methods, including the Scherrer, Monshi-Scherrer, Williamson-Hall, Size-Strain Plot, and Halder-Wagner approaches. The calculated crystallite sizes were found to be within the nanometer scale, with variations depending on the assumptions and principles of each method. Overall, the results demonstrate that wet chemical precipitation using eggshell-derived calcium is an effective approach for producing hydroxyapatite with favorable structural and microstructural properties.
Pengembangan Kurikulum dan Pembelajaran Pendidikan Agama Islam di Sekolah dan Madrasah: Analisis Integratif atas Desain, Implementasi, dan Evaluasi Azizah Nurtantri; Agus Pahrudin; Agus Jatmiko; Meriyati
IERA, Islamic Education and Research Academy Vol. 7 No. 3 (2026): October 2026
Publisher : STAI Miftahul Ula Nganjuk

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59689/iera.v7i3.2207

Abstract

This article critically examines the development of Islamic Religious Education (PAI) curricula and instruction in Indonesian schools and madrasahs through an integrative lens linking curriculum design, classroom implementation, and learning assessment. Using a qualitative conceptual literature-review approach, the study analyzes academic literature published primarily between 2021 and 2026, supplemented by relevant foundational sources. The analysis identifies a recurrent misalignment between formal curriculum aims, pedagogical practice, and evidence of students’ religious and ethical development. Differences in subject organization between schools and madrasahs require differentiated instructional pathways without compromising shared educational purposes. The study proposes a contextual and iterative framework comprising needs diagnosis, coherent learning-outcome design, active instruction, multidimensional assessment, and evidence-based curriculum reflection. It argues that technological innovation should serve pedagogical and ethical objectives rather than become an end in itself. This framework provides conceptual guidance for curriculum developers and PAI educators; however, its effectiveness needs subsequent empirical testing
Co-Authors A'la Nirotul Fikri A'vi Amelia AA Sudharmawan, AA Aben Puspita Adib, Muhammad Adinda, Charisma Agitha Pricilia Agus Dwiyanto, Agus Agus Pahrudin Agustiana Agustiana Ahmad Ikhlas Ahmad Ilham Fadli Ainunisa, Ulfa Ajir, Ikhtiar Cahya Al Imron, Muhammad Al Khansa, Elsa Al-Ghifari, Dimas Amelia, Ananda Andrini, Mike Angga Pratama Anggun Juliyani Anizar Rahayu Apriyani, Hikma Armayoga, Bagas Arum, Rezki Perwita Aryati, Sri Nia Aryati, Sri Nia Asep Fathurrohman Asip Ependi Asy Syauqi, Icha Aulia Novitasari Ayun Hafifatul Mukarohmah Azad, Inamul Azet Sampurna Azizah Nurtantri Bagaskara, Figo Rangga Basyar, Syaripudin Cahniyo Wijaya Kuswanto Chairul Amriya Chairul Amriyah Chairul Amriyah Chairul Amriyah Chairul Amriyah Chairul Amriyah, Ade Vera Yantika, Ahmad Ilham Fadli, Ahmad Syafak Khoirut Tobib Chairul Anwar Dedy Irawan Desiana Desiana, Desiana Devi Kurniawati Diah Irdiyana Rizqi Dian Resti Ningsih Dinda Marsya Dona Dinda Pratiwi Dwi Suci Rahma Putri Edo Ramada Efendi, Asip Efta Afriliani Elly Kurniawati Elsa Al Khansa Ependi, Asip Erli Yana Erliyana Erliyana Eti Hadiati Fadila Rahmah Fahmi Elen Family, Ade Vera Yantika Fifi Risana Gita Novian Hermana Hadi Suprayetno, Eko Dian Hadi, A. Ikhlas Muhtar Hakim, Andi Lukman HAMIDAH Heny Wulandari Herlina Hikma Apriyani Hikma Apriyani Husnilawat Husnilawat Husnilawat, Husnilawat Husnilawati, Husnilawati Ida Fiteriani Idamayanti, Dewi Ihsan Mustofa Ihsan Mustofa Ikat Sutriani Ilham Fathoni Ilham Fatoni Ilham Jaya Kesuma Ilhami Ilhami Imam Syafe'i Imam Syafei Imam Syafe’I Imam Syafe’i Indah Nur Bella Sari Indah Permata Sari Iqbal Iqbal Irwandani Istiqomah, Dwi Jamal Fakhri Jaya Kesuma, Muhammad Ilham Joko Prasetyo Juli Yansyah, Muhammad Eko Jusmalisa, Icha Kanada Komariyah Kartika Sari Kartina, Yesilia Kartina, Yesilia Khamim Zarkasih Putro Koderi Lina Mauliana Linggaria Lova Lismayanti Lismayanti Listyawan, Haris Luthfia Hanifatus Saiyidah Luthfia Hanifatus Saiyidah M Eko Juli Yansyah M Juhri AM Massika, Shofi Mawadda, Novziah Maylia Khairunnisa Baher Meriyati Meriyati Meriyati Meriyati Meriyati Meriyati Meriyati Meriyati Mia Oktavia Oktavia Misalia Sari Moch Wisnu Arif Sektiono Mu'adz Haidar Zulkarnain Muchsin Afriadi, Muhammad Muflikhatun Muhammad Abdullah Sidiq Muhammad Adib Muhammad Al Imron Muhammad Fajar Muhammad Ilham Jaya Kesuma Muhammad Izzad Khairi Yazid Muhammad Rifkhi Maulana Mulya, Neni Mustaqim Mustaqim Mustaqim Mustaqim, Mustaqim Mustofa, Ihsan Muzekki Muzekki Muzekki, Muzekki Mu’adz Haidar Zulkarnain Na'imah Nabila Al Najla Nadhifa Arufah Chafshah Nanda Sugesti, Vina Neni Mulya Neni Mulya Novita Ana Anggraini NUR HASANAH Nur Hasanah Nur Rohfitta Nurhaida Widiani Nurul Hasanah Ovi Prasetya Winandari Pasetiyo, Andika Eko Pitri Sundary Pramodana, Dimas Raba Prasetyo, Nabil Tito Pratama, Riki Adi Pricilia, Agitha Pricilia, Agitha Purnama Sari, Nurul Purwanto, Burhan Eko Putri Rahayu, Salma Putro, Khamim Zarkasih Radjendra, Ryan Rahmadani, Melinia Rahmah, Fadila Rangga Bagaskara, Figo Rani Nopriyanti Rany Widyastuti Rany Widyastuti Ratna Wardani Refliyanto Refliyanto Reiska Primanisa Rezki Perwita Arum Rita Ningsih Riyani, Indah Robingatin Robingatin Romlah Romlah Romlah Romlah Sampurna, Azet Sari, Indah Nur Bella Sela Sopiana Setiana, Nurul Setianingrum, Diah Ayu Siti Khotimah Siti Patimah Sri Nia Aryati Subandi Subandi Sufian, Muhammad Suherman Suherman, Suherman Sukatin, Sukatin SULASTRI Sulistiono, Priyo SUNARTO Sunarto Sunarto Sundary, Pitri Sunyoto, S Sutriani, Ikat Syafi'i, Imam Syafrimen Syafril Syaiful Anwar Syaripudin Basyar Syifaul Karima Taza Nur Utami Titik Rahayu Titik Rahayu Umi Hijriah Umi Hijriah Untung Nopriansyah Utami, Taza Nur Utami, Taza Nur Viyantini Kuswanto , Anggil Wildayah Musyafa Yansyah, M Eko Juli Yaumas, Nova Erlina Yesilia Kartina Yuli Yanti Yuli, Yuli Yanti Zahratul Fitriyani Zahratul Fitriyani Zainal Abidin Αmia Kasmila