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All Journal Dharma Bakti AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Serambi Engineering Jnanadharma
Caecilia Pujiastuti
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Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences Other

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Journal : Serambi Engineering

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Pengaruh Filler Nano Precipitated Calcium Carbonate dan Gliserol Terhadap Bioplastik Pati Jagung , Resa Damayanti; Meldi Ramahdani Intan Pertiwi; Titi Susilowati; Caecilia Pujiastuti; Susilowati
Jurnal Serambi Engineering Vol. 10 No. 1 (2025): Januari 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Precipitated calcium carbonate (PCC) with a size of less than 100 nm has been shown to improve the hardness and strength of a material, making it suitable as a filler in the production of bioplastics. Biodegradable plastics are plastics that can be used like conventional plastics, but can be broken down by microorganisms after use, making them environmentally friendly. The aim of this study is to investigate the effect of adding nanoprecipitated calcium carbonate (PCC) filler and glycerol on the mechanical properties and biodegradation of corn starch-based bioplastics, and to produce biodegradable plastic that meets the Indonesian National Standard (SNI). The method used is melt intercalation to produce bioplastics from corn starch with the addition of nano-PCC and glycerol. The best results were obtained with 12% Nano-PCC and 20% glycerol, which gave a tensile strength of 3.54 MPa, 12% Nano-PCC and 50% glycerol, which gave an elongation percentage of 23.7%, and 4% Nano-PCC and 60% glycerol, which gave 100% biodegradation within 30 days. A higher concentration of Nano-PCC filler increases the tensile strength, improves the elongation percentage and reduces the degradation rate of the plastic. A higher concentration of glycerol decreases tensile strength, increases elongation and increases the degradation rate of the plastic.
Conversion of Magnesium from Bittern with Sodium Phosphate Addition through Precipitation Process Dodik Hendra Saputra; Evlyansa Bunga Rizka Ananda; Dyah Suci Perwitasari; Caecilia Pujiastuti
Jurnal Serambi Engineering Vol. 10 No. 3 (2025): Juli 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Bittern, a by-product of the salt production process, contains high concentrations of magnesium ions, which have significant economic potential and use value in various fields. The objective of this study is to recover magnesium from bittern using sodium phosphate (Na₃PO₄) through the process of chemical precipitation. The reaction between magnesium and phosphate produces magnesium phosphate compounds, which are commercially valuable in the industrial and agricultural sectors. The present study analysed the effect of several process parameters, including pH, temperature and reaction time, on magnesium recovery efficiency. Optimum conditions were obtained at pH 9 with the addition of a 15% concentrated Na₃PO₄ solution. The precipitate formed was then characterised using X-Ray Fluorescence (XRF) to confirm the presence of magnesium phosphate. The findings demonstrate that this method facilitates the effective recovery of magnesium from bittern, exhibiting both high efficiency and good selectivity. This approach has the potential to provide a sustainable solution for the treatment of bittern effluent, whilst concomitantly producing environmentally friendly value-added products.
Co-Authors , Resa Damayanti Arya Widira Adi Nugraha Cyrilla Indri Parwati Dodik Hendra Saputra Dyah Suci Perwitasari Evlyansa Bunga Rizka Ananda Indri Parwati Meldi Ramahdani Intan Pertiwi Pakpahan, Octavia Marsha Sudarsono Susilowati Titi Susilowati