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Synthesis of Modified Polyvinyl Pyrrolidone (PVP) Silver Nanoparticles Using Soursop (Annona muricata Linn) Leaf Extract and Its Application as a Heavy Metal Colorimetric Sensor Yussi Pratiwi; Rizky Amelia; Yusmaniar
Chemistry and Materials Vol. 3 No. 1 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i1.66

Abstract

This study aims to analyze the characteristics and performance of silver nanoparticles (AgNP) synthesized using soursop leaf extract bioreductor modified with the addition of polyvinyl pyrrolidone (PVP) stabilizer as a colorimetric sensor for heavy metal ions. The synthesis of silver nanoparticles was carried out by reducing AgNO3 using soursop leaf extract (Annona muricata Linn) bioreductor modified with the addition of PVP as stabilizer. The results showed that the optimum synthesis volume ratio of AgNP synthesis was 0.7 mL of soursop leaf extract: 10 mL AgNO3 with the addition of 3% PVP stabilizer. The formation of AgNP was characterized by a change in the color of the solution from yellow to brownish with a surface plasmon resonance peak at a maximum wavelength of 438 nm. Fourier-transform infrared spectroscopy studies showed hydroxyl groups (-OH) and carbonyl groups (C=O) play a role in the reduction process of silver ions. Particle size analysis results demonstrated an average particle size of 71.5 nm with a polydispersity index value of 0.364. The results of the colorimetric analysis showed that the synthesized AgNPs proved to be highly selective towards Cu metal ions.
Effect of Mass and Contact Time of Coffee Grounds in Nickel Metal Ion Adsorption on Liquid Waste of Chemistry Laboratory Trinanda, Inez; Yussi Pratiwi; Tritiyatma Hadinugrahaningsih
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.86

Abstract

Based on Indonesian Government Regulation PP No. 22 of 2021 concerning the implementation of environmental protection and management, the quality standard for nickel in waters is 0.05 mg/L. Nickel waste is very harmful to aquatic and terrestrial ecosystems and poses risks to human health. In this study, nickel waste was treated with coffee grounds using the adsorption method. The purpose of this study was to determine the effect of variations in the mass of coffee grounds and contact time on the adsorption of nickel metal in the liquid waste generated by the UNJ Chemistry laboratory. Coffee grounds are activated with NaOH 0.01 M to increase their adsorption ability. Two tests were conducted, namely, the variation of adsorbent mass and the variation of contact time. Based on the results of testing the variation of adsorbent mass and contact time, the highest percentage of removal was obtained at 91.70% at a mass of 0.05 g with a contact time of 15 minutes. The lowest percentage of removal was 39.56% in a mass of 1.5 g with a contact time of 90 minutes. This research provides a novel approach to heavy metal waste treatment especially nickel metal ion, which can be adapted to enhance waste treatment technologies in the future.
PENINGKATAN EKONOMI MASYARAKAT MELALUI PENGUATAN MUTU PANGAN OLAHAN DAN PEMASARAN DIGITAL DI DESA PASIRNANJUNG, SUMEDANG Setia Budi; Yusmaniar; Yussi Pratiwi; Rasikha Ulhaq; Anisa Hanum; Almira Talitha Hasna; Masykur Falah Naidi; Madinah Fatma; Retno Dewi Kusumaningsih
Prosiding Seminar Nasional Pengabdian Kepada Masyarakat Vol. 6 No. 1 (2025): PROSIDING SEMINAR NASIONAL PENGABDIAN KEPADA MASYARAKAT - SNPPM2025
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstrak Perkembangan era digital telah menjadikan pemasaran online sebagai strategi utama dalam mendukung keberlanjutan usaha, termasuk bagi Usaha Mikro, Kecil, dan Menengah (UMKM) berbasis pangan olahan. Namun, masyarakat di wilayah pedesaan masih menghadapi keterbatasan dalam akses informasi dan penguasaan teknologi digital. Tujuan Program Pengabdian Kepada Masyarakat (PKM) terintegrasi Kuliah Kerja Nyata (KKN) di Perumahan Griya Sahla, Desa Pasirnanjung, Sumedang dilaksanakan untuk menjawab tantangan tersebut. Kegiatan dilaksanakan meliputi pelatihan peningkatan mutu produk pangan olahan dan strategi pemasaran digital berbasis marketplace. Hasil kegiatan menunjukkan adanya peningkatan keterampilan masyarakat dalam mengolah produk pangan yang berkualitas serta kemampuan memanfaatkan platform digital untuk memperluas pasar. Dampaknya produk lokal menjadi lebih dikenal, meningkatkan daya saing, serta berkontribusi pada peningkatan pendapatan dan perekonomian masyarakat setempat. Program ini sekaligus menunjukan peran strategis perguruan tinggi dalam mendukung pemberdayaan masyarakat berbasis potensi lokal dan transformasi digital. Abstract The development of the digital era has made online marketing a key strategy in supporting business sustainability, including for Micro, Small, and Medium Enterprises (MSMEs) engaged in the processed food industry. However, communities in rural areas still face limitations in accessing information and mastering digital technologies. The Community Service Program (PKM), integrated with the Student Community Service (KKN) in Griya Sahla Housing, Pasirnanjung Village, Sumedang, was carried out to address these challenges. The activities included training on improving the quality of processed food products and implementing digital marketing strategies through online marketplaces. The results showed an increase in community skills, including the ability to produce higher-quality food products, as well as the capacity to utilize digital platforms to expand market reach. As a result, local products have become more recognized, competitiveness has improved, and contributions to household income and the local economy have increased. This program also highlights the strategic role of universities in supporting community empowerment, leveraging local potential, and digital transformation.