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All Journal Industrial Research Workshop and National Seminar Journal of Green Science and Technology
Puspita, Nina
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Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation Other

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Efektivitas Suhu Operasi dalam Peningkatan Lapisan Oksida Hasil Hard Anodizing Aluminium dalam Asam Sulfat 15% dan Asam Phospat 1% Salsabila, Intan; Rusmana, Muchamad Raihan Surya; Puspita, Nina; Fauzan, Rizky; Sihombing, Rony Pasonang
Prosiding Industrial Research Workshop and National Seminar Vol. 14 No. 1 (2023): Vol 14 (2023): Prosiding 14th Industrial Research Workshop and National Semina
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v14i1.5362

Abstract

Anodisasi merupakan metode pelapisan logam yang melibatkan konversi permukaan logam menjadi lapisan oksida melalui proses elektrolisis. Salah satu tujuan dari metode ini adalah untuk melindungi bagian logam sehingga dapat meningkatkan nilai kekerasan, ketahanan terhadap korosi, dan tahan aus. Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi suhu operasi terhadap efisiensi dan ketebalan lapisan oksida yang dihasilkan melalui proses anodisasi. Larutan elektrolit yang digunakan meliputi asam sulfat 15% dengan penambahan konsentrasi phospat 1%. Spesimen yang digunakan adalah aluminium tipe 1100 dengan tingkat kemurnian 99,00%, diberikan rapat arus sebesar 3A/dm2, waktu anodisasi berlangsung selama 30 menit pada variasi suhu 5°C; 10°C; dan 15°C. Berdasarkan analisis data didapatkan bahwa penggunaan suhu operasi yang rendah dapat meningkatkan nilai efisiensi, ketebalan lapisan oksida dan massa oksida. Nilai massa oksida dan efisiensi tertinggi diperoleh dari penelitian hard anodizing dengan suhu 5oC dan waktu anodisasi selama 30 menit, dengan hasil massa oksida sebesar 0,255 g dan efisiensi proses 69,03%. Nilai ketebalan lapisan oksida terbaik sebesar 18,43 µm diperoleh dari penelitian hard anodizing dengan suhu 5°C dan waktu anodisasi selama 30 menit.
Phosphoric Acid-Activated Carbon From Coffee Grounds and Fly Ash For Efficient Laundry Wastewater Adsorption Muhari, Emma Hermawati Muhari; Silalahi, Rafael Leonardo; Puspita, Nina; Maryani, Anisya Sri; Sihombing, Rony Pasonang; Adhitasari, Alfiana; Kurnia, Dianty Rosirda Dewi
Journal of Green Science and Technology Vol 9 No 2 (2025): Journal of Green Science and Technology Vol. 9 No.2 September 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i2.10649

Abstract

Laundry waste that is directly discharged into water bodies causes pollution due to its chemical content, such as phosphate. The adsorption method is chosen as an option to reduce the phosphate content in laundry waste due to its simple preparation and low cost. The adsorbent used is a mixture of coffee grounds and fly ash. The use of coffee grounds is based on the increasing waste from coffee shops, thus being utilized as an adsorbent. The aim of this study is to determine the effectiveness of coffee grounds and fly ash with the best combination of composition and contact time using the adsorption method. The stages begin with the preparation of coffee grounds and fly ash through carbonization and activation using H3PO4. The variations performed consisted of variations in the composition of coffee grounds and fly ash with a total of 1 gram in ratios of 1:4; 2:3; 1:1; 3:2; 4:1 and contact time variations of 15 minutes, 30 minutes, 45 minutes, 60 minutes, and 75 minutes. Based on the research results, the highest percentage of removal was found in the composition variation of coffee grounds and fly ash with a ratio of 1:4 for 75 minutes.
Co-Authors Alfiana Adhitasari Fauzan, Rizky Kurnia, Dianty Rosirda Dewi Maryani, Anisya Sri Muhari, Emma Hermawati Muhari Rusmana, Muchamad Raihan Surya Salsabila, Intan Sihombing, Rony Pasonang Silalahi, Rafael Leonardo