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All Journal OPSI Industrial and Domestic Waste Management
Juwarin Pancawati
Department of Environmental Studies, Universitas Sultan Ageng Tirtayasa, Serang, Banten 42435, Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Environmental Science Industrial & Manufacturing Engineering

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Environmentally Friendly Silver Nanoparticle Synthesis Using Gandaria (Bouea macrophylla) Leaf Waste Extract for Mercury Detection in Facial Cream Products Bramantyo Hario Nugroho; Juwarin Pancawati; Yus Rama Denny
Industrial and Domestic Waste Management Volume 6 - Issue 2 - 2026
Publisher : Tecno Scientifica Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53623/idwm.v6i2.1287

Abstract

This study aimed to synthesize and characterize silver nanoparticles (AgNPs) using the stem bark extract of Gandaria (Bouea macrophylla) and to evaluate their selectivity for mercury (Hg) detection. The Gandaria stem bark was extracted using methanol as the solvent through the maceration method. Silver nanoparticles were synthesized using extract concentrations of 1%, 2%, and 4%. Characterization of the AgNPs using UV–Visible spectrophotometry showed that the highest absorbance was observed at the 4% extract concentration, whereas the lowest absorbance was recorded at the 1% concentration. The selectivity test demonstrated that the synthesized AgNPs were highly selective toward Hg in HgCl₂ solution compared with Pb in PbCl₂ solution and Ca in CaCl₂ solution. AgNPs synthesized using the 4% extract concentration could be used as a preliminary qualitative colorimetric detection material for identifying mercury in facial whitening creams available on the market. Based on Particle Size Analyzer (PSA) and Scanning electron microscopy with energy dispersive X-ray spectrometry (SEM–EDX) analyses, the AgNPs synthesized using the 4% Gandaria stem bark extract were confirmed to fall within the nanoparticle size range.
Implementation of cleaner production in the refined sugar industry to reduce landfilling in waste management at sugar industry in Cilegon Prio Utomo; Fatah Sulaiman; Juwarin Pancawati
OPSI Vol 19 No 1 (2026): OPSI - June 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Industri UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/opsi.v19i1.15669

Abstract

Sugar Industry in this study  is a company located in Cilegon City, Banten Province, operating in the refined sugar industry. The objective of this study is threefold: first, to identify the flow of materials, products, and non-products in the refined sugar production process; second, to identify potential cleaner production alternatives applicable to the industry; and third, to determine the priority scale of cleaner production opportunities in the refined sugar industry. The research methods employed encompass a comprehensive array of approaches, including a thorough literature review, observational studies, environmental assessments, and comparative analyses. According to the findings of the research study, the total amount of waste generated in 2023 was 19,025.36 tons. Of this, 5,575.52 tons (29.3%) were landfilled, and 13,449.84 tons (70.7%) were reused by other industries. In 2024, the total waste generated was 16,579.35 tons, of which 16,568.44 tons were utilized by other industries as alternative fuel or alternative raw materials, and a mere 10.91 tons were sent to landfill. According to the 2024 data, a mere 0.07% of the total waste was landfilled, while a staggering 99.7% was reused by other companies. The implementation of cleaner production and zero-landfill principles has the potential to repurpose the waste generated.
Co-Authors Bramantyo Hario Nugroho Fatah Sulaiman Prio Utomo Yus Rama Denny