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All Journal Jurnal Teori dan Aplikasi Fisika Journal of Community Empowerment
Nishfa Mufatihah
Universitas Negeri Semarang
Astronomy Education Electrical & Electronics Engineering Materials Science & Nanotechnology Physics

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Karakterisasi Absorbansi Material Expanded Polystyrene (Eps) Menggunakan Spektrofotometer Uv-Vis Nishfa Mufatihah; Ian Yulianti; Teguh Darsono; Budi Astuti
Jurnal Teori dan Aplikasi Fisika Vol. 14 No. 01 (2026): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v14i01.546

Abstract

Expanded Polystyrene (EPS) merupakan polimer termoplastik yang banyak digunakan karena sifatnya yang ringan, tahan kimia, dan mampu menyerap serta mentransmisikan radiasi elektromagnetik, termasuk cahaya tampak dan ultraviolet. Penelitian ini bertujuan untuk mengkaji pengaruh suhu pemanasan terhadap sifat optik EPS, khususnya nilai absorbansi dan indeks bias, dalam konteks aplikasinya sebagai material inti pandu gelombang optik. Tiga sampel EPS disiapkan: tanpa pemanasan, serta dipanaskan masing-masing pada suhu 150 °C dan 220 °C. Proses fabrikasi melibatkan pelarutan EPS dalam toluena, dilanjutkan dengan aplikasi larutan ke kaca objek, dan karakterisasi dilakukan menggunakan spektrofotometer UV-Vis pada rentang panjang gelombang 200-1200 nm. Hasil pengujian menunjukkan bahwa pemanasan EPS pada 150 °C menurunkan absorbansi UV dan meningkatkan kekakuan material, sementara pemanasan pada 220 °C menyebabkan peningkatan kembali absorbansi akibat pembentukan gugus kromofor, namun menurunkan fleksibilitas material. Sampel tanpa pemanasan menunjukkan absorbansi tertinggi dan indeks bias terbesar (n ≈ 1.59), serta fleksibilitas yang optimal. Berdasarkan hasil ini, EPS tanpa pemanasan dinilai paling layak untuk diaplikasikan sebagai material inti dalam sistem pandu gelombang optik berbasis polimer.     Kata kunci: Expanded Polystyrene (EPS), Indeks Bias, Spektroskopi, UV-Vis
Household Organic Waste Utilization for Hermetia illucens Larvae Cultivation in a Circular Economy Supriyadi Supriyadi; Dewi Mustikaningtyas; Andhina Putri Heriyanti; Kusmuriyanto Kusmuriyanto; Mochamad Nur Sholikhin; Nishfa Mufatihah
Journal of Community Empowerment Vol. 6 No. 1 (2026): Journal of Community Empowerment
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jce.v6i1.48235

Abstract

Waste management has become a major environmental issue in Semarang City due to population growth and rapid urban development, including in Sendangguwo Village, Tembalang District. The increasing volume of household organic waste requires sustainable management strategies to reduce waste accumulation and support environmental conservation. This community service program aimed to implement a circular economy approach through the establishment of an Organic Waste Bank and the cultivation of Hermetia illucens larvae as a form of organic waste utilization with economic value.The program was carried out in three stages: (1) socialization and education on household organic waste management through the Organic Waste Bank, (2) practical training on Hermetia illucens larvae cultivation, and (3) evaluation of program implementation. Training and mentoring methods were employed, involving the service team and partners from PT BERRSIH as resource persons and facilitators.The results showed that the program successfully established an Organic Waste Bank in Sendangguwo Village and improved community knowledge and skills in managing organic waste and cultivating larvae. The cultivated larvae can be utilized as an alternative feed source for poultry and fish, providing additional economic benefits to the community. In conclusion, the integration of an Organic Waste Bank with Hermetia illucens larvae cultivation effectively supports circular economy practices by reducing household organic waste and creating value-added products. This program contributes to environmental sustainability, community empowerment, and the development of innovative waste management practices for society.      
Co-Authors Andhina Putri Heriyanti Budi Astuti Dewi Mustikaningtyas Ian Yulianti Kusmuriyanto Kusmuriyanto Mochamad Nur Sholikhin Supriyadi Supriyadi Teguh Darsono