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All Journal Jurnal Bahan Alam Terbarukan PROSIDING SEMINAR KIMIA ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry JURNAL ATOMIK Walisongo Journal of Chemistry Jurnal Kumparan Fisika AKM: Aksi Kepada Masyarakat
Husna Syaima
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Mulawarman, Samarinda 75123, Indonesia
Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Energy Environmental Science Materials Science & Nanotechnology Physics Social Sciences Other

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MINI-REVIEW MENGENAI PEMANFAATAN MATERIAL BERBASIS POLIMER KOORDINASI BERPORI UNTUK PENYIMPANAN HIDROGEN Syaima, Husna; Intifadhah, Sahara Hamas
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

This review aims to summarize the various types of Metal-Organic Frameworks (MOFs) and their utilization for hydrogen storage. MOFs have high surface area, flexibility, good stability and tunability, various active sites, and abundant raw materials. These characteristics make MOFs worthy of being considered as a new material in hydrogen storage applications. The potential for using MOFs is very broad because its properties can be determined from the choice of metal and linker. Hydrogen gas storage commonly requires high pressure tanks whereas in liquid form, it requires cryogenic temperatures due to its very low boiling point, the challenge is to synthesize MOF with high hydrogen adsorption capacity under mild conditions. Moreover, it is crucial to learn about the relationship among the pore volume and surface area of MOFs, physisorption of hydrogen, and adsorption condition.
EXPERIMENTAL CHARACTERIZATION TECHNIQUES FOR TRANSITION METAL COMPLEX ANALYSIS Syaima, Husna
JURNAL ATOMIK Vol 9 No 1 (2024)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v9i1.1368

Abstract

Due to their diverse properties and functionalities, metal complexes are central to various applications spanning chemistry, materials science, and beyond. The elucidation of metal complexes through rigorous analysis is paramount for understanding their structure, properties, and potential applications. This review article provides an overview of the techniques employed for analyzing metal complexes and highlights the importance of instrumental techniques utilized. Techniques such as X-ray crystallography, thermogravimetric analysis (TGA) and differential thermal analysis (DTA), Fourier-transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), and X-ray diffraction (XRD) are discussed in detail, showcasing their roles in probing different aspects of metal complex chemistry. By employing these analytical techniques, researchers can gain valuable insights into metal complexes' composition, structure, thermal stability, and electronic properties, driving innovation and progress in various scientific and technological fields. Continuous advancements in analytical techniques further enhance capabilities in metal complex analysis, paving the way for ground-breaking discoveries and transformative advancements in chemistry and related disciplines.
Mini-Review: The Influence of Coating and Doping on The Crystal Volume and Discharge Capacity of Lithium Iron Phosphate-Based Materials as Battery Cathode Intifadhah, Sahara Hamas; Syaima, Husna
Jurnal Kumparan Fisika Vol. 7 No. 2: Agustus 2024
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.7.2.74-83

Abstract

ABSTRAK   Baterai ion litium adalah jenis baterai isi ulang yang memiliki kapasitas tinggi, potensi elektrokimia yang baik, dan daya tahan yang kuat. Perkembangan LiFePO4 sebagai material katoda baterai ion litium semakin meningkat dengan adanya beberapa teknik tambahan dalam proses sintesis untuk meningkatkan performa seperti teknik pelapisan dan penyisipan atom. Hal tersebut mempengaruhi volume kristal, serta sifat elektrokimia material berbasis LiFePO4. Metode pelapisan yang menunjukkan peningkatan nilai kapasitansi material berbasis LiFePO4. Sedangkan pada metode penyisipan atom, beberapa penelitian menggunakan atom Ce, Ru, Co, Na, Si, Mn, Zn dan In untuk disisipkan di atom Fe, Li, atau P pada material berbasis LiFePO4. Hasil yang diperoleh dari beberapa penelitian tentang sintesis material katoda LiFePO4 menunjukkan adanya peningkatan kapasitas discharging dan peningkatan volume kristal olivine, sehingga teknik pelapisan dan penyisipan ini dapat digunakan untuk peningkatan performa elektrokimia.   Kata  kunci: LiFePO4, Pelapisan, Penyisipan, Volume Kristal, Kapasitansi   ABSTRACT   Lithium-ion batteries are a type of rechargeable battery that has high capacity, good electrochemical potential, and strong durability. The development of LiFePO4 as a cathode material for lithium-ion batteries has been increasing with the addition of several techniques in the synthesis process to enhance performance, such as coating and atom insertion techniques. These techniques affect the crystal volume and the electrochemical properties of LiFePO4-based materials. Coating methods have shown improvements in the capacitance values of LiFePO4-based materials. Meanwhile, in atom insertion methods, some studies have used Ce, Ru, Co, Na, Si, Mn, Zn, and In atoms to be inserted into Fe, Li, or P atoms in LiFePO4-based materials. Results from several studies on the synthesis of LiFePO4 cathode materials have shown an increase in discharge capacity and an increase in the volume of olivine crystals, indicating that coating and insertion techniques can be used to improve electrochemical performance.   Keywords: LiFePO4, Doping, Coating, Crystal Volume, Capacity
OPTIMASI PEMBENTUKAN NANOPARTIKEL PERAK DENGAN BIOREDUKTOR DARI EKSTRAK DAUN TAHONGAI ( Kleinhovia hospita Linn.) -, Rahayuningsih; Hindryawati, Noor; Syaima, Husna
JURNAL ATOMIK Vol 9 No 2 (2024)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v9i2.1397

Abstract

The synthesis of Silver Nanoparticles was carried out by bottom-up method by reducing Ag+ ions to Ag0 using Tahongai leaves (Kleinhovia hospital Linn) which contain secondary metabolites such as alkaloids, flavanoids and phenolics as bioreductors that reduce AgNO3 solution as a precursor. The purpose of this study was to determine whether tahongai leaves can be used as a bioreductor in the synthesis of silver nanoparticles. The concentration variation of tahongai leaf extract bioreductor was 25 %; 50 %; and 75 %. Changes in silver nanoparticles can be marked by changes in the color of the solution and by UV-Vis Spectrophotometer absorption. The results of this study showed a change in color of AgNO3 solution from clear to brownish yellow which indicates the formation of silver nanoparticles, and through UV-Vis Spectrophotometer analysis showed absorption at wavelengths of 420 to 430 which indicates relatively stable nanoparticles so it can be concluded that tahongai leaf extract can be used as a bioreductor for the synthesis of silver nanoparticles.
DEPOLIMERISASI LIMBAH POLIETILEN TEREFTALAT (PET) MENJADI ASAM TEREFTALAT (SUMBER LINKER MOF-5) DENGAN METODE HIDROLISIS ASAM BASA Mid, Arsy Aprilia; Syaima, Husna; Hindryawati, Noor
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Terephthalic acid is an important ligand in the manufacture of MOF-5 which has been obtained from the depolymerization of PET (polyethylene terephthalate) recycled from PET plastic waste. Depolymerization of PET polymers into terephthalic acid ligands (linkers) is carried out using the acid-base hydrolysis method at room temperature using H2SO4 and NaOH. The yield was obtained at 40.95% (8.19 grams). PET monomers in the form of terephthalic acid were then tested by Thin Layer Chromatography (TLC) using n-hexane and ethyl acetate solvents (1:2). The TLC results showed the same stain spot between depolymerized terephthalic acid and commercial terephthalic acid. Depolymerized terephthalic acid and commercial terephthalic acid were then analyzed using Fourier Transform Infrared (FTIR) which showed the presence of functional groups C=O, C-O, C-H, and O-H and analyzed with a UV-Visible Spectrophotometer and obtained a maximum wavelength in both materials of 306 nm. Keywords: Terephthalic Acid, depolymerization, polyethylene terephthalate
ADSORPSI ZAT WARNA RHODAMIN B MENGGUNAKAN KOMPOSIT Fe3O4-AMPAS KOPI Astuti, Resky Widya; Alimuddin, Alimuddin; Syaima, Husna
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Adsorption of Rhodamin B Dye with Fe3O4-Coffee Grounds Composite has been carried out. The purpose of this study is to determine the optimum time, optimum pH, maximum adsorption capacity and type of adsorption isotherm in rhodamin B dye with Fe3O4-Coffee grounds composite. The first stage of making Fe3O4-Coffee grounds composite using the coprecipitation method with FeCl3‧6H2O and Fe(SO4)2‧7H2O was weighed with a molar ratio of 3:2, then combined with coffee grounds. The results showed that the optimum time was obtained at 20 minutes, at the optimum pH at pH 10, and the maximum adsorption capacity obtained was 40.19 mg/g. The results of the determination of the type of isoterm in the adsorption of rhodamin b were obtained by the type of Langmuir isoterm. Keywords: Rhodamine B, Adsorption, Composite Fe3O4-coffee grounds
PENGEMBANGAN KOMPOSIT ZIF-8 DENGAN LOGAM OKSIDA Sardi, Adelia Maritza; Syaima, Husna
PROSIDING SEMINAR KIMIA Vol 3 No 2 (2025): Prosiding SNKT 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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This review article discusses the effectiveness of composite synthesis methods for ZIF-8 with metal oxides and their applications in various fields. ZIF-8 is a popular metal-organic framework due to its stability; however, it has limitations, such as low conductivity, limited catalytic activity, and poor recyclability. To address these issues, various methods for synthesizing ZIF-8-metal oxide composites have been developed in recent years. These composites demonstrate significant potential to enhance performance in applications like photocatalysis and energy storage, as metal oxide-based materials can provide higher energy density and improved conductivity. This review presents a recent comparison of different synthesis methods to provide further insights into developing these materials for industrial applications. Keywords : Metal Oxide, ZIF-8, ZIF-8 Composite Synthesis
MINI-REVIEW: VARIASI AGEN DEPROTONASI DALAM SINTESIS ZIF-8 DAN APLIKASINYA Fausiah, Ulfa; Syaima, Husna
PROSIDING SEMINAR KIMIA Vol 3 No 2 (2025): Prosiding SNKT 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Mini-review this discusses recent studies related to the synthesis of ZIF-8 with variations of deprotonation agents and their applications. ZIF-8 with the molecular formula C8H12N4Zn is generally synthesized from Zn(NO3)2.6H2O (zinc nitrate hexahydrate) or other metal salts as a central metal source bonded to C4H6N2 (2-methylimidazole) as an organic compound and water as a solvent. In recent years, research on ZIF-8 has continued to grow with various modifications made by researchers. The synthesis process generally involves the use of expensive and flammable organic solvents in the synthesis medium and results in harmful effects to the environment due to its toxic nature. This raises urgency in ZIF-8 synthesis innovation, one of which is with a green synthesis method using water-based solvents. In the synthesis of ZIF-8, deprotonation agents such as NH4OH, TEA, NAOH and others are often used. The use of this deprotonation agent allows the formation of ZIF-8 with good crystal size, surface area, pore volume and % yield from ZIF-8 produced both synthetic ZIF-8 can be used in various fields such as antibiotic adsorption, catalysts, and separation. Keywords : synthesis, deprotonation, ZIF-8, antibiotic
Rice Husk Ash: A Promising Heavy Metal Adsorbent For Wastewater Treatment Kumalasari, Meiyanti Ratna; Beladona, Siti Unvaresi Misonia; Gracia, Amanda Natania; Sugiyani, Tina; Wulandari, Oktavia Rahmi; Imelya, Marsya; Syaima, Husna; Hanif, Qonita Awliya
Walisongo Journal of Chemistry Vol. 7 No. 1 (2024): Walisongo Journal of Chemistry
Publisher : Department of Chemistry Faculty of Science and Technology UIN Walisongo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/wjc.v7i1.18852

Abstract

The primary polluter of the environment is liquid waste. Silica is one substance that can be utilized to minimize water pollution. Silica can be produced from agricultural biomass waste, such as rice husk ash. This study investigated the preparation of rice husk ash and the optimal synthesis method for producing bio-silica. A literature review of studies on rice husk ash, heavy metals, and adsorbents was conducted. The findings indicated that boiling rice husk at 800°C and washing with HCl produced high-purity silica. XRD (X-ray diffraction), FT-IR (Fourier transform infrared) spectrophotometers, and ED-XRF (Energy Dispersive X-ray fluorescence) were employed to characterize the rice husk ash. The precipitation, sol-gel, acidification, and hydrothermal methods were compared for bio-silica synthesis. The synthesized bio-silica can be used as a heavy metal absorbent for various metal ions, including Pb2+, Zn2+, Mn2+, Cu2+, As3+, As5+, and Cd2+.
Co-Authors -, Rahayuningsih Ahmad, Atika Aulia Akbar, Muhammad Marion Allo, Veliyana Londong Anisa Nurul Hanifa Arief, M. Syaiful Ariffah Ana Fathonah Astuti, Resky Widya Duratulhikmah, Nur Fadhilah Fausiah, Ulfa Gaanty Pragas Maniam, Gaanty Pragas Ganjar Fadillah Gracia, Amanda Natania Hiyahara, Irfan Ashari Imelya, Marsya Indriani, Isah Waliah Intifadhah, Sahara Hamas Irfan Ashari Hiyahara Larasati, Zarra Udyani Mid, Arsy Aprilia Moh Syaiful Arif Nanang Tri Widodo Nanang Tri Widodo Noor Hindryawati, Noor Pramudita Putri Kusuma Putra, Narundana Perdana Qonita Awliya Hanif Rahayuningsih Rahayuningsih, Rahayuningsih Rahmat Gunawan Ratna Setyaningsih RR Dirgarini Julia Nurlianti Subagyono Salsabila, Aidilia Putri Sardi, Adelia Maritza Sari, Meiyanti Ratna Kumala Sentot Budi Rahardjo Siti Unvaresi Misonia Beladona Sugiyani, Tina Teguh Endah Saraswati Teguh Wirawan, Teguh Wulandari, Oktavia Rahmi Wulandari, Siti Aprilia Zahra, Marinda Afifatu