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All Journal Jurnal Ilmiah Biosaintropis (Bioscience-Tropic) Jurnal Pengabdian Pada Masyarakat JMM (Jurnal Masyarakat Mandiri) ORBITA: Jurnal Pendidikan dan Ilmu Fisika SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan KONSTAN - JURNAL FISIKA DAN PENDIDIKAN FISIKA Jurnal Pengabdian Magister Pendidikan IPA Biota EIGEN MATHEMATICS JOURNAL Indonesian Physical Review Kappa Journal Jurnal Pengabdian Masyarakat Sains Indonesia (Indonesian Journal Of Science Community Services) SPIN: Jurnal Kimia & Pendidikan Kimia Jurnal Warta Desa (JWD) Jurnal Pertambangan dan Lingkungan
Alaa, Siti
Physics Departement, Faculty Of Mathematics And Natural Sciences, University Of Mataram
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Pengolahan Limbah Cangkang Kerang Mutiara (Pinctada Maxima) Sebagai Adsorben Logam Berat Fe Susi Rahayu; Siti Alaa; Dewi Handayani; Dian W Kurniawidi
JURNAL PERTAMBANGAN DAN LINGKUNGAN Vol 3, No 2 (2022): Desember 2022
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpl.v3i2.11464

Abstract

Fe is a type of heavy metal that can cause damage to the environment and health. If the concentrations of Fe are more than 1 mg/L, it can lead to toxic effects to the human body. The level of Fe contamination in the environment needs to be controlled to diminish hazardous effects. This can be conducted by modifying a smart material to adsorb the Fe metal. The material modification was carried out by isolating pearl oyster shells (Pinctada maxima) into chitosan as Fe metal adsorbent. The main aim of this research is to identify the ability of chitosan to soak Fe up. To obtain chitosan material, the pearl shells were isolated through 3 stages, namely deproteination, demineralization, and deacetylation. The isolated chitosan powder was identified the typical group forming chitosan using FTIR and the yield of each isolation process was calculated. Meanwhile, the ability of chitosan to adsorb Fe metal was identified through testing using AAS. The results of the calculation of the yield of the chitosan isolation process showed a decrease in mass at each stage. Until the final stage, the powder yield decreases to 32.17% from the initial mass used. In addition, the FTIR results also figure out that chitosan was successfully synthesized in the presence of the OH functional group at a wave number of 3434.660 cm-1 and the NH2 functional group at a wave number of 1626.110 cm-1 with a degree of chitosan deacetylation of 80.534%. It is clear from the results of AAS where the highest adsorption capacity is 33,262 mg/g with an adsorption efficiency of 99,788%. Therefore, the pearl shells have been successfully adjusted into chitosan. Where chitosan is one of the excellent biomaterials to absorb the heavy metal.
Pengaruh Variasi Suhu Kalsinasi terhadap Struktur Kristal dan Sifat Mekanik Hidroksiapatit dari Limbah Cangkang Kerang Mutiara Susi Rahayu; Dian W. Kurniawidi; Siti Rubi’ah; Hurnah Hurnah; Abdul Gani; Siti Alaa
Kappa Journal Vol 9 No 3 (2025): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i3.33013

Abstract

Hydroxyapatite (HAp is widely known as a promising biomaterial because its chemical composition closely resembles that of human bone and teeth, making it suitable for biomedical uses such as bone tissue engineering and implant materials. This study explores how variations in calcination temperature (750–950 °C) affect the crystal structure and mechanical properties of HAp synthesized from Pinctada maxima shells—a calcium-rich biogenic waste. The crystal structure was analyzed using X-ray Diffraction (XRD), while mechanical properties were evaluated using a Tensilon testing machine. The XRD results showed a phase shift from the dominance of tricalcium phosphate (TCP) at low temperatures towards the dominant HAp phase at high calcination temperatures with improved crystallinity from 33.94% to 45.89%. The mechanical tests showed compressive strength values of 0.1981 to 0.3148 MPa and the elastic modulus of 14.941 to 26.721 MPa. The higher calcination temperature tends to increase the cristallinity, density, and compressive strength, but reduced elasticity due to a stiffer internal structure. These results indicate that changes in crystal structure have a direct effect on increasing the compressive strength and stiffnes of the material.  This study confirms the potential ofPinctada maxima shells as a sustainable calcium source for producing high-quality hydroxyapatite suitable for biomedical applications.
Simulasi Numerik Persamaan Transfer Panas Dua Dimensi Pada Silinder Komposit Multilayer dengan Sumber Panas Bergantung Waktu Siti Alaa; Dian Wijaya Kurniawidi; Susi Rahayu
Eigen Mathematics Journal Vol. 2 No. 2 Desember 2019
Publisher : University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/emj.v1i2.44

Abstract

Perpindahan panas merupakan fenomena fisika yang banyak diaplikasikan dalam bidang dirgantara, industri, nuklir, pembangkit listrik, dan otomotif. Simulasi dapat dilakukan untuk lebih memahami fenomena perpindahan panas agar dapat menghemat biaya dan risiko yang timbul. Profil perpindahan panas dalam silinder komposit multilayered dua dimensi telah berhasil ditentukan dengan menggunakan metode analitik dan numerik. Profil distribusi suhu dalam waktu yang berbeda dan difusivitas termal yang berbeda untuk dua lapisan telah berhasil  dihitung menggunakan Python 3.7 dengan Numpy library.
Co-Authors Abdul Gani Amrul Ikhsan Arif Budianto Baiq R. S. Yusuf Bakti Sukrisna Bakti Sukrisna Dewi Handayani Dian W Kurniawidi Dian W. Kurniawidi Dian Wijaya Kurniawidi Dita Wiliana Ervina Sandra Dewi Eva Nurhaliza Gaoura Valentina Handayana, I Gusti Ngurah Yudi Hasmiyatni Hasmiyatni Hurnah Hurnah I Wayan Sudiarta I Wayan Sudiarta Irma Pratiwi Iwan Sumarlan Kholik Hidayatullah Marlita Yudiawati Muhammad Fajrin Muhammad Zuhdi Nurlaili Nurlaili Nurul Qomariyah NURUL QOMARIYAH P Purwanto Putri, Dina Soes Ramadian Ridho Illahi Ridho Ahyana Ridho Ahyana SATRIYAS ILYAS Satriyogi Putramulyo Siti Rubi’ah Sri Mulyani Suhayat Minardi Susi Rahayu Syahrial Ayub Syamsuddin Syamsuddin Syamsuddin Syamsuddin Syamsuddin Teguh Ardianto, Teguh Wirawan, Rahadi Zahrah Ramadlan Mubarokah