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All Journal JPMS (Jurnal Pendidikan Matematika dan Sains) Jurnal Inovasi Pendidikan IPA Science and Technology Indonesia Jurnal Pendidikan Sains Indonesia (Indonesian Journal of Science Education) Jurnal Sains Materi Indonesia
Kamari, Azlan
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Education Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics

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Journal : Science and Technology Indonesia

 1 
Thermal Conversion of Coral Waste and its Utilization as Low-Cost Catalyst for Biodiesel Production Widianingsih, Suci; Yanti , Ika; Kamari, Azlan; Fatimah, Is
Science and Technology Indonesia Vol. 9 No. 4 (2024): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.4.866-875

Abstract

This study investigates the thermal conversion of waste coral and its utilization as a heterogeneous catalyst for biodiesel production from soybean oil. In this work, waste coral is calcined at varied temperatures of 800, 900, and 1000°C, and the effect of the calcination temperature on the physicochemical character of the solid is evaluated through Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and basicity measurement. The results show that the higher temperature facilitates the conversion of CaCO3 of the aragonite and calcite phases in raw waste coral into CaO, achieving a complete conversion at the temperature of 1000°C. Thermal conversion influences the increased surface basicity of the solid, which is associated with the higher activity for biodiesel production. Further studies on the obtained CaO as a catalyst demonstrate the catalyst dosage and the methanol-to-oil ratio as significant factors for fatty acid methyl ester production. The highest yield of 98.7% is achieved after a 3 hours reaction with 8 wt.% catalyst dosage and 9:1 methanol-to-oil ratio. The catalyst exhibits stability with an insignificantly decreased yield until the fifth usage cycle. The optimum conditions and reusability features of the calcined waste coral suggest that waste coral is a favorable CaO catalyst source for biodiesel production.
Clitoria ternatea Flower Extract Mediated Synthesis of Ni-Doped Hydroxyapatite as Photocatalyst, Antibacterial, and Drug Delivery Agent for Anticancer Drug Fatimah, Is; Nurlaela, Nunung; Fauziyyah, Anas Zahra; Sagadevan, Suresh; Hidayat, Habibi; Haneef, Mehru Nisha Muhamad; Daud, Muhammad Fauzi; Kamari, Azlan; Oh, Won-Chun
Science and Technology Indonesia Vol. 10 No. 2 (2025): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.2.360-373

Abstract

In the present study, green synthesis of nickel-doped hydroxyapatite using Clitoria ternatea flower extract, and activity testing as photocatalyst, antibacterial agent and drug delivery agent were performed. Synthesis was conducted by hydrothermal treatment of co-precipitated precursors previously mediated with the extract. As drug delivery agent, immobilization of 5-fluorouracil (5FU) onto the prepared sample was performed by spray-drying method. Physicochemical characterization techniques of X-ray diffraction, UV-Visible Diffuse Reflectance Spectrophotometry, transmission electron microscopy, Raman and Fourier-Transform Infra-red spectroscopy were performed to determine the structural and surface properties of material. Photocatalytic activity evaluation for tetracycline removal showed that material has capability to reduce concentration by photocatalytic degradation and photocatalytic oxidation. The degradation efficiency of material was 83.78%. The prepared material exhibited a significant activity against Staphylococcus aureus and Escherichia coli bacteria. The material also expressed the potency as a drug-delivery agent of 5-fluorouracil as shown by the reduced CT26 cell viability of more than 85% during 48 hours.
Co-Authors Anti Kolonial Prodjosantoso Budi Hastuti Daud, Muhammad Fauzi Eli Rohaeti Endang Widjajanti Fauziyyah, Anas Zahra Habibi Hidayat, Habibi Haneef, Mehru Nisha Muhamad Is Fatimah Martanisa, Mutiah Nisriyah, Safarin Nurlaela, Nunung Oh, Won-Chun Priyadi*, Danang Restu Utami, Restu Romadhoni*, Siti Dzakiya Sagadevan, Suresh Saptono Hadi, Saptono Setyowati, Widiastuti Agustina Eko SRI ATUN Suci Widianingsih Yanti , Ika