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All Journal BERKALA SAINSTEK Konversi
Ajiz, Hendrix Abdul
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Education Mathematics Physics

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Peningkatan Stabilitas Busa dengan Nanofluida Silika Untuk Meningkatkan Produksi Gas Alam Ajiz, Hendrix Abdul; Mawarani, Lizda Johar; Widiyastuti, Widiyastuti; Setyawan, Heru
BERKALA SAINSTEK Vol 8 No 1 (2020)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v8i1.15401

Abstract

Pemanfaatan gas alam sebagai sumber energi alternatif masih belum optimal karena masalah beban cairan pada sumur gas, surfaktan merupakan solusi yang menjanjikan untuk mengatasi masalah tersebut, namun dengan kondisi sumur gas yang ekstrem diperlukan stabilizer untuk meningkatkan stabilitasnya. Penelitian ini mempelajari pengaruh pencampuran surfaktan dan stabilizer berupa silika (SiO2) nanopartikel yang disintesa dari sodium silikat (Na2SiO3) untuk mendapatkan kondisi optimum nanofluida SiO2 terhadap waktu paruh busa yang menunjukkan kestabilannya. Silika nanopartikel disintesa dengan metode sol-gel dan dipertahankan dalam fase koloid stabil yang kemudian didispersikan ke dalam larutan surfaktan tanpa perlu penambahan bahan penyambung. Nanofluida SiO2 kemudian dimatangkan dengan variasi waktu dan konsentrasi silika. Dari hasil yang diperoleh menunjukkan bahwa peningkatan waktu pematangan dan konsentrasi silika memengaruhi nilai tegangan permukaan yang berakibat menurunkan waktu paruh busa. Penurunan kestabilan busa terjadi karena peristiwa adsorbsi fisik molekul surfaktan oleh silika nanopartikel yang ditunjukkan oleh nilai tegangan permukaan, karena silika yang bersifat hidrofilik akan membentuk ikatan fisik dengan surfaktan, semakin meningkatnya waktu pematangan dan konsentrasi silika yang didispersikan kedalam larutan akan meningkatkan adsorbsi molekul surfaktan pada permukaan silika dan menyebabkan terjadinya peningkatan nilai tegangan permukaan nanofluida. Stabilitas busa terbaik diperoleh pada sampel dengan waktu pematangan selama 6 jam dan konsentrasi silika 0,001% menghasilkan waktu paruh selama 1170 menit yang jika dibandingkan dengan surfaktan tanpa penambahan silika nanopartikel hanya memeroleh waktu paruh selama 90 menit, sehingga penggunaan silika nanopartikel sebagai stabilizer memberikan efek yang signifikan terhadap kestabilan busa.
Unveiling the role of cellulose solvent systems in direct and sustainable silica amination: a new pathway beyond aminopropyl agents Ajiz, Hendrix Abdul; Widiyastuti, Widiyastuti; Setyawan, Heru; Muljani, Srie; Suryandari, Ade Sonya; Erliyanti, Nove Kartika
Konversi Vol 14, No 2 (2025): OCTOBER 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v14i2.23610

Abstract

The functionalization of silica surfaces using sustainable amine sources is critical for advancing environmentally friendly materials in CO2 capture technologies. In this study, bio-based organosilanes derived from coconut fiber cellulose were explored as a green alternative to conventional aminosilane. Two solvent systems DMSO/NH4OH and NaOH/urea were utilized to dissolve and regenerate cellulose, enabling direct grafting onto silica surfaces. Comparative analysis revealed that while DMSO/NH4OH-dissolved cellulose exhibited a modest amine loading of 23.43% wt, comparable to aminopropyl-based modification (22.41% wt), the NaOH/urea system significantly improved the grafting efficiency, reaching 40.52% wt. This enhancement is attributed to urea’s amphiphilic properties, which facilitate both hydrophobic interactions and carbamate formation. The use of a sulfur-free NaOH/urea system not only improves performance but also aligns with green chemistry principles. These results demonstrate the potential of biomass-derived cellulose as a viable modifying agent for silica, paving the way for scalable, low-toxicity, and circular-economy-based material design strategies.
Process intensification of silica amination through ultrasound-assisted impregnation: toward highly efficient amino-functionalized particles Ajiz, Hendrix Abdul; Widiyastuti, Widiyastuti; Setyawan, Heru; Suryandari, Ade Sonya; Erliyanti, Nove Kartika
Konversi Vol 15, No 1 (2026): APRIL 2026
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v15i1.25507

Abstract

Amine-functionalized porous silica is a highly promising material for sustainable carbon capture; however, increasing amine loading is often limited by pore blocking and diffusion resistance of the modifying agents. This study proposes an ultrasound-assisted ex-situ impregnation strategy to enhance aminopropyl grafting efficiency within macroporous silica matrices. Macroporous silica particles were synthesized via a sol-gel spray drying route using an anionic surfactant template and subsequently functionalized with alkoxy-aminopropyl ligands. The results demonstrate that the synergistic effects of ultrasonic irradiation and macroporous morphology significantly improve ligand distribution homogeneity, suppress particle agglomeration, and promote aminopropyl penetration into the internal pore network while minimizing pore blocking induced by self-condensation. FTIR and TG-DTA analyses confirm a substantial increase in aminopropyl loading up to 0.9610 mmol g-1 silica, nearly twice that achieved by conventional impregnation, despite a reduction in specific surface area due to pore filling. Overall, this approach provides an efficient and scalable pathway for producing amine-rich silica adsorbents with enhanced accessibility and strong potential for sustainable CO2 capture applications.
Co-Authors Erliyanti, Nove Kartika Heru Setyawan Lizda Johar Mawarani SRIE MULJANI Suryandari, Ade Sonya Widiyastuti Widiyastuti