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All Journal AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment)
Srie Muljani
Chemical Engineering, Faculty of Science and Technology, UPN “Veteran” Jawa Timur, Surabaya, Indonesia
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Education Energy Environmental Science

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Sustainable Fabrication of Green Chemistry Silica-Carbon Composites Derived from Coconut Coir and Dicalite Using Ion Exchange Method Lely Amoi; Adinda Dwi Febriana; Srie Muljani; Suprihatin; Nurul Widji Triana
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 1 (2026)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v10i1.937

Abstract

This research aimed to synthesise sustainable silica–carbon composites derived from coconut coir and dicalite diatomite using an ion-exchange-assisted sol–gel method and to evaluate the effects of gel-forming pH and carbonisation temperature on the resulting composite characteristics. The investigated parameters included gel formation pH 5 and carbonization temperature (400–800 °C). FTIR, XRD, and SEM–EDX analyses were applied to determine functional groups, phase structure, elemental composition, and surface morphology. The results revealed that the composite synthesised at pH 5 and carbonised at 800 °C exhibited the optimal structural properties. This condition produced a homogeneous morphology, balanced silica–carbon integration, reduced sodium residue, and a stable amorphous phase without crystalline formation. Higher carbonization temperatures enhanced siloxane network condensation and improved interfacial bonding between silica and carbon phases. The synthesis guidelines for silica-carbon composite fabrication should therefore emphasise controlled acidic gel formation and high-temperature carbonisation to produce structurally stable, well-integrated materials suitable for adsorption and environmental applications. Contribution to Sustainable Development Goals (SDGs):SDG 12: Responsible Consumption and ProductionSDG 13: Climate ActionSDG 9: Industry, Innovation and Infrastructure
Synthesis and Characterization of Calcium Phosphate-Based Material Containing P and K Based on Acetylene Gas Waste Raw Material Using Dissolution and Precipitation Methods Citra Siwi Estiningtyas; Apprinda Wahyudyah Winali; Srie Muljani; Suprihatin Suprihatin; Ely Kurniati
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 3 (2026)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29165/ajarcde.v10i3.1154

Abstract

Acetylene gas waste possesses considerable potential for reutilization because of its high calcium content, although inadequate management may lead to adverse environmental effects. This research was conducted to synthesize and characterize multinutrient phosphate-based materials derived from acetylene gas waste through dissolution and precipitation techniques. The synthesis involved reacting calcium hydroxide obtained from acetylene gas waste with phosphoric acid (H?PO?), followed by a precipitation process using NH?OH and KOH solutions. The experimental variables included pH values ranging from 7 to 11 and H?PO? concentrations between 15% and 55%. Characterization of the synthesized products was performed using X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), and X-Ray Diffraction (XRD) to evaluate elemental composition, crystal morphology, and crystalline structures. The findings revealed that higher pH values and increased H?PO? concentrations had a significant influence on both the yield and quality of the precipitated products. The maximum yield of 90% was achieved at an H?PO? concentration of 55% and pH 10. SEM observations revealed that the products exhibited a finer, more homogeneous crystal morphology, while XRF analysis confirmed that calcium was the dominant element, accompanied by phosphorus and potassium, indicating the successful synthesis of calcium phosphate-based materials. Furthermore, XRD analysis confirmed the formation of crystalline calcium phosphate compounds. Overall, the study highlights the potential application of acetylene gas waste as an alternative raw material for the production of sustainable and environmentally friendly phosphate fertilizers. Contribution to Sustainable Development Goals (SDGs):SDG 9: Industry, Innovation and InfrastructureSDG 12: Responsible Consumption and ProductionSDG 13: Climate Action
Co-Authors Adinda Dwi Febriana Apprinda Wahyudyah Winali Citra Siwi Estiningtyas Ely Kurniati Lely Amoi Nurul Widji Triana Suprihatin Suprihatin Suprihatin