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All Journal Chemica: Jurnal Ilmiah Kimia dan Pendidikan Kimia Hydrogen: Jurnal Kependidikan Kimia
Ramdhan, Mohamad Alief
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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Synthesis of Silicon/Silica/Carbon Composite from Rice Husk via Mechanical Milling Method as Anode Lithium-Ion Batteries Ramdhan, Mohamad Alief; Muliawati, Nindya Tri
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 3 (2025): June 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i3.16618

Abstract

Silicon (Si) and silicon dioxide (SiO₂), with high theoretical capacities of 4200 mAh g⁻¹ and 1965 mAh g⁻¹ respectively, have attracted considerable interest as potential anode materials for lithium-ion batteries (LIBs), especially when derived from abundant and renewable sources like rice husk (RH). However, their practical applications are hindered by major challenges, such as significant volume expansion (100%–300%) during charge/discharge cycles and inherently low electrical conductivity (~10⁻¹ S m⁻¹). This study aims to develop a low-cost, sustainable, and high-performance Si/SiO₂/C composite anode material from rice husk using a combination of mechanical milling and AlCl₃/NaCl-activated aluminothermic reduction. The work specifically explores the effects of single-step versus two-step milling processes on the structural integrity and electrochemical performance of the resulting composites. The two-step milling method, a relatively new and more controlled approach, effectively eliminated unwanted metal oxide by-products, as confirmed by X-ray diffraction (XRD) analysis. In contrast, the single-step process resulted in residual impurities. Electrochemical tests revealed that the two-step Si/SiO₂/C composite delivered a significantly higher specific capacity of 280.01 mAh g⁻¹ after 50 cycles, compared to 146.15 mAh g⁻¹ from the single-step method. These results highlight the potential of rice husk-derived Si/SiO₂/C composites as eco-friendly and efficient anode materials for next-generation LIBs.
Eco-Friendly Ultrasound-Assisted Synthesis of Silver Nanoparticles Mediated by Tea Leaf Extracts and Their Potential Applications Muliawati, Nindya Tri; Fajar, Malik; Sholeha, Novia Amalia; Ramdhan, Mohamad Alief; Laila, Farida; Sujarnoko, Tekad Urip Pambudi; Yulianti, Wina; Supardan, Atep Dian; Listiasari, Faranita Ratih; Resmeiliana, Ika
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 5 (2025): October 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i5.18213

Abstract

The green synthesis of silver nanoparticles (AgNP) presents notable benefits, such as environmental sustainability, simplicity, cost-effectiveness, and scalability for industrial applications. This study utilized green tea leaves (Camellia sinensis), which are abundant in catechins and polyphenols, as natural reducing and stabilizing agents. Ultrasonic-assisted synthesis was utilized to improve extraction and reduction processes, as acoustic cavitation induced by ultrasonic waves facilitates efficient mass transfer, accelerates nucleation, and enhances nanoparticle dispersion. This method provides an environmentally sustainable and economically viable alternative to conventional AgNP synthesis, enhancing the sustainability of nanoparticle production. The successful synthesis of AgNP was evidenced by the distinct color change of the tea extract from green to brown, accompanied by the formation of a brown colloidal suspension, in accordance with the Surface Plasmon Resonance (SPR) phenomenon. The UV-Vis spectrophotometric analysis confirmed AgNP formation, evidenced by a characteristic absorption peak at approximately 430 nm. The synthesized AgNPs were utilized as a colorimetric sensor for Fe³⁺ ions in aqueous solutions, demonstrating distinct color changes and SPR band shifts upon interaction with the metal. This illustrates their capability as environmentally friendly nanomaterials for the swift and precise detection of heavy metals, aiding in sustainable environmental monitoring. This research integrates ultrasonic-assisted synthesis with green tea extract, presenting a viable approach for the large-scale, environmentally sustainable production of nanoparticles.
Pengembangan SmartClimaPack Bioplastik dari Pati Onggok, Selulosa Jagung, dan Minyak Sereh John, Grace Putri; Assyafaqi, Aqila Ulinnuha; Rahmi, Fadila Tul; Supriadi, Gilang Reynaldy; Ramdhan, Mohamad Alief; Hermawan, Faris; Muliawati, Nindya Tri
Chemica: Jurnal Ilmiah Kimia dan Pendidikan Kimia Vol 26, No 2 (2025): CHEMICA
Publisher : Jurusan Kimia FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/chemica.v26i2.76936

Abstract

ABSTRAKPlastik konvensional telah banyak digunakan dalam kehidupan modern, namun produksinya masih bergantung pada sumber daya fosil yang bersifat non-biodegradable dan berdampak buruk bagi lingkungan. Oleh karena itu, penelitian ini bertujuan untuk mengembangkan SmartClimaPack bioplastik berbahan dasar pati onggok dan selulosa tongkol jagung yang diperkaya minyak atsiri sereh sebagai kemasan aktif biodegradable untuk memperpanjang umur simpan buah klimaterik. Bioplastik dibuat melalui proses ekstraksi minyak sereh dan delignifikasi tongkol jagung, kemudian dikarakterisasi dengan uji kadar air, ketahanan air, biodegradabilitas, dan FTIR. Hasil menunjukkan bahwa bioplastik memiliki kadar air sebesar 15,77%, ketahanan air 91,00%, nilai swelling 9,0%, dan persentase degradasi mencapai 76% dalam 13 hari. Analisis FTIR mengonfirmasi adanya gugus fungsional yang saling berinteraksi melalui ikatan hidrogen pada matriks bioplastik. Dengan demikian, SmartClimaPack berpotensi menjadi kemasan aktif ramah lingkungan yang tidak hanya melindungi produk, tetapi juga memperpanjang umur simpan buah.Kata Kunci: Bioplastik, Pati, Selulosa, SmartClimaPackABSTRACTConventional plastics have been widely used in modern life; however, their production still relies on fossil-based resources that are non-biodegradable and environmentally harmful. Therefore, this study aims to develop SmartClimaPack, a bioplastic derived from cassava starch residue and corn cob cellulose enriched with lemongrass essential oil, designed as an active biodegradable packaging to extend the shelf life of climacteric fruits. The bioplastic was produced through lemongrass oil extraction and corn cob delignification, followed by evaluations of moisture content, water resistance, swelling, biodegradability, and FTIR analysis. The results revealed that the bioplastic exhibited a moisture content of 15.77%, water resistance of 91.00%, swelling value of 9.0%, and biodegradation rate of 76% within 13 days. FTIR analysis confirmed the presence of functional groups interacting through hydrogen bonding within the bioplastic matrix. Thus, SmartClimaPack demonstrates strong potential as an eco-friendly active packaging material that not only provides physical protection but also extends fruit shelf life.
Co-Authors Assyafaqi, Aqila Ulinnuha Atep Dian Supardan Fajar, Malik Faris Hermawan, Faris John, Grace Putri Laila, Farida Listiasari, Faranita Ratih Muliawati, Nindya Tri Rahmi, Fadila Tul Resmeiliana, Ika Sholeha, Novia Amalia Supriadi, Gilang Reynaldy Tekad Urip Pambudi Sujarnoko Wina Yulianti