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Srie Muljani
Universitas Pembangunan Nasional “Veteran” Jawa Timur
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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Pemanfaatan Adsorben Dari Cangkang Telur Ayam Broiler Untuk Menurunkan Kadar Cu Pada Limbah Elektroplating Aiman Najib Ilham; Hanif Surya Priyatama; Srie Muljani; Caecilia Pujiastuti; Dyah Suci Perwitasari
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Limbah elektroplating mengandung logam berat seperti tembaga (Cu) yang bersifat toksik dan berbahaya bagi lingkungan serta kesehatan manusia. Penelitian ini bertujuan untuk memanfaatkan cangkang telur ayam broiler sebagai adsorben alternatif yang ekonomis dan ramah lingkungan dalam menurunkan kadar Cu pada limbah elektroplating. Cangkang telur diaktivasi menggunakan HCl 0,1 M selama 24 jam, kemudian dikeringkan pada suhu 100°C. Proses adsorpsi dilakukan dengan variasi massa adsorben (2, 4, 6, 8, dan 10 gram) dan waktu kontak (20, 40, dan 60 menit) pada volume larutan 20 mL dengan konsentrasi awal Cu 958,03 mg/L. Analisis kadar Cu menggunakan Spektroskopi Serapan Atom (AAS). Hasil penelitian menunjukkan bahwa efisiensi adsorpsi meningkat seiring bertambahnya massa adsorben dan waktu kontak. Kondisi optimum dicapai pada massa adsorben 6 gram dan waktu kontak 60 menit dengan persentase recovery sebesar 99,5764% dan kadar akhir Cu 4,058 mg/L. Model isoterm Langmuir (R² = 0,8911) lebih sesuai dibandingkan Freundlich (R² = 0,846) dalam menggambarkan proses adsorpsi, yang mengindikasikan adsorp si terjadi pada permukaan homogen dengan pembentukan monolayer. Rasio optimum adsorben terhadap larutan adalah 1 : 3,33 (gram/mL). Penelitian ini membuktikan bahwa cangkang telur ayam teraktivasi asam berpotensi sebagai adsorben yang efektif dan efisien untuk pengolahan limbah elektroplating.
Balancing Mechanical Properties, Water Resistance, and Soil Degradability of Rice Flour/CMC-Based Biodegradable Drinking Straws Alya Keisha Intan Chayrunisya; Qanitah Nibras Firmaniya; Srie Muljani; Luluk Edahwati; Caecilia Pujiastuti
Jurnal Serambi Engineering Vol. 11 No. 3 (2026): Juli 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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The development of biodegradable drinking straws requires a balance between mechanical integrity, flexibility, water resistance, and post-use degradability. This study investigated the effects of rice flour-to-carboxymethyl cellulose (CMC) ratio and plasticizer conditions on the functional performance of biodegradable drinking straws. Five rice flour:CMC ratios (1:3, 1.5:2.5, 2:2, 2.5:1.5, and 3:1) were combined with two plasticizers (glycerol and sorbitol) at three loadings (1.5, 2.0, and 3.0 mL), resulting in 30 formulations. The resulting straws were evaluated for tensile strength, elongation at break, water resistance, and soil-burial degradation. Tensile strength ranged from 0.588 to 3.822 MPa, with the highest value obtained at a rice flour : CMC ratio of 1:3 containing 1.5 mL sorbitol. Elongation at break ranged from 12.545 to 88.964%, with the maximum achieved at a ratio of 3:1 containing 2.0 mL glycerol, demonstrating a clear strength–flexibility trade-off. Water resistance varied from 25 to 74%, while soil-burial mass loss reached 86.2–100% after 21 days. The different formulations maximizing tensile strength, flexibility, and water resistance indicate that plasticizer performance is strongly dependent on matrix composition rather than plasticizer identity alone.   
Co-Authors Aiman Najib Ilham Alya Keisha Intan Chayrunisya Caecilia Pujiastuti Dyah Suci Perwitasari Hanif Surya Priyatama Luluk Edahwati Qanitah Nibras Firmaniya