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

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Production of Calcium Nitrate Fertilizer from Calcium Hydroxide Waste: Effects of Reaction Temperature and Nitric Acid Concentration Devina Anindya Sabella; Dyah Ayu Nyata Ningrum; Sintha Soraya Santi; Suprihatin; Caecilia Pujiastuti
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 10 No. 2 (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.v10i2.1110

Abstract

Calcium hydroxide (Ca(OH)?) waste generated from the acetylene gas industry contains a high calcium content and has potential to be utilized as an alternative raw material for calcium nitrate fertilizer production. This study presents a novel approach for the valorization of Ca(OH)? industrial waste into a value-added calcium nitrate fertilizer through a reaction and crystallization process. The effects of reaction temperature and nitric acid concentration on calcium nitrate production were investigated. The Ca(OH)? waste was initially reduced to a particle size of 100 mesh, then reacted with nitric acid at concentrations of 1, 1.25, 1.5, 1.75, and 2 N and at reaction temperatures of 50, 60, 70, 80, and 90°C for 1 hour. The obtained calcium nitrate solution was filtered, neutralized using 25% NH?OH until pH 7, and crystallized at 150°C to obtain calcium nitrate crystals. The raw material was characterized using X-ray fluorescence (XRF), while the calcium nitrate product was analyzed using inductively coupled plasma (ICP), spectrophotometry, and yield calculation. The XRF analysis showed that Ca(OH)? waste contained 98.71% calcium. At a reaction temperature of 70°C and a nitric acid concentration of 1.5 N, calcium nitrate was successfully produced with the highest calcium (Ca) and nitrogen (N) content of 21.91% and 16.74%, respectively, and produced a yield of 69.564%, which is in accordance with the Indonesian National Standard (SNI 02-2806-1992) for calcium nitrate fertilizer, which stipulates a Ca content of 19–22% and an N content of 15.5%. This study was conducted without experimental replication; therefore, statistical significance analysis was not performed. The findings demonstrate that Ca(OH)? waste from the acetylene industry can be effectively valorized into calcium nitrate fertilizer, providing an alternative strategy for industrial waste utilization and supporting circular economy principles. Contribution to Sustainable Development Goals (SDGs):SDG 2: Zero HungerSDG 8: Decent Work and Economic GrowthSDG 9: Industry, Innovation, and InfrastructureSDG 12: Responsible Consumption and ProductionSDG 13: Climate Action
Synthesis of CaO-MgO Catalyst from Dolomite via Dissolution and Precipitation Processes Amelia Salsabilla Cantika; Moh. Rizal Febriyanto; Ketut Sumada; Ardika Nurmawati; Caecilia Pujiastuti; Erwan Adi Saputro
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.v10i3.1155

Abstract

Dolomite is an abundant carbonate mineral containing calcium and magnesium compounds that can serve as a precursor for heterogeneous catalyst synthesis. This study investigated the effects of NaOH volume (90-170 mL) and dehydration temperature (300-700°C) on the synthesis and physicochemical properties of calcium-magnesium-based materials prepared via a dissolution-precipitation method, which was selected over conventional calcination because it enables systematic control of the precipitation process through adjustment of the NaOH volume. XRF analysis showed that the raw dolomite contained 88.81% CaO and 9.70% MgO. Two-way ANOVA confirmed that NaOH volume, dehydration temperature, and their interaction significantly affected catalyst basicity (p < 0.001), with the highest value (1.960 mmol/g) obtained at 150 mL NaOH and 500°C. SEM analysis of catalysts with low, medium, and high basicity revealed increasingly well-developed and uniformly distributed particle morphologies toward the optimum condition, while EDX identified calcium, magnesium, and oxygen as the predominant elements. BET characterization of the material exhibiting the highest basicity showed a specific surface area of 126.585 m2/g and an average pore diameter of 21.545 nm. These findings demonstrate that NaOH volume and dehydration temperature play important roles in tailoring the physicochemical properties of the catalyst materials. The optimized synthesis condition provides useful guidance for preparing calcium-magnesium-based materials with high basicity and favorable textural properties and serves as a foundation for future phase identification and catalytic performance evaluation. Contribution to Sustainable Development Goals (SDGs):SDG 9: Industry, Innovation and InfrastructureSDG 12: Responsible Consumption and ProductionSDG 13: Climate Action
Co-Authors Amelia Salsabilla Cantika Ardika Nurmawati Devina Anindya Sabella Dyah Ayu Nyata Ningrum Erwan Adi Saputro Ketut Sumada Moh. Rizal Febriyanto Sintha Soraya Santi Suprihatin