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Andi Haslinah
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Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics

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Fabrication of Hydrophobic Graphene-Cellulose Composite Paper Using Rice Husk Ash Silica Sariwahyuni; Herlina Rahim; Hanim Istatik Badi'ah; Andi Haslinah; Mega Fia Lestari
Science Journal Get Press Vol 2 No 4 (2025): October, 2025
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v2i4.233

Abstract

This study presents the fabrication and characterization of a sustainable graphene–cellulose composite paper reinforced with rice husk ash (RHA)–derived amorphous silica. Silica was extracted via alkaline leaching–acid precipitation, yielding a porous, high-purity amorphous phase well-suited for reinforcement. Composite papers were prepared by incorporating varying loadings of graphene nanoplatelets (0.5–2 wt%) and silica (5–15 wt%) into cellulose pulp, followed by ultrasonication, vacuum filtration, and hot pressing. Structural and morphological analyses (FTIR, XRD, SEM) confirmed effective dispersion and strong filler–matrix interactions. The incorporation of graphene and silica significantly enhanced surface hydrophobicity, raising the water contact angle from 62.5° for neat cellulose to 152.7°—indicative of a near-superhydrophobic state. Mechanical testing revealed an optimal formulation (1 wt% graphene + 10 wt% silica) that improved tensile strength by 42% and Young’s modulus by 36% compared to neat cellulose. Higher filler concentrations slightly reduced tensile strength due to filler agglomeration. This work demonstrates a valorization pathway for low-cost agricultural residues to produce eco-friendly composite materials with superior mechanical and surface properties, suitable for applications in packaging, filtration, or protective coatings.
Synthesis and Characterization of Graphene Oxide-Based Composite Membranes for Enhanced Seawater Desalination Process Efficiency Andi Haslinah; Lieza Corsita; Setiarto Pratigto; Indah Tri Rizky; Adianti Putri Alitonang
Science Journal Get Press Vol 3 No 1 (2026): January, 2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i1.354

Abstract

Graphene oxide (GO) is a promising nanomaterial for membrane-based desalination due to its tunable interlayer structure and abundant surface functionalities. This study synthesized and characterized a graphene oxide titanium dioxide (GO–TiO₂) composite membrane via vacuum-assisted filtration to enhance seawater desalination performance. Characterization using XRD, FTIR, SEM, and contact angle analysis confirmed uniform TiO₂ incorporation, which expanded GO interlayer spacing from 0.77 nm to 0.90 nm, increased hydrophilicity, and improved structural stability. Forward osmosis (FO) tests using 3.5 wt% NaCl feed solution showed that the GO–TiO₂ membrane achieved over 99% salt rejection and a 125% increase in water flux compared to pristine GO membranes. TiO₂ acted as a nano-spacer and hydrophilic agent, reducing GO restacking and facilitating water transport. These results indicate that the GO–TiO₂ composite membrane offers enhanced permeability, selectivity, and durability, making it a promising candidate for sustainable seawater desalination.
Co-Authors Adianti Putri Alitonang Badi'ah, Hanim Istatik Herlina Rahim Indah Tri Rizky Lieza Corsita Mega Fia Lestari Sariwahyuni Setiarto Pratigto