Herwiyoso, Razzan (2025) Pengaruh Jumlah Membran Dan Besar Tegangan Pada Adsorpsi Terhadap Efektivitas Recovery Emas Pada Sistem Elektrolisis Berbasis Nano Chitosan Oligosaccharida. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Meningkatnya permintaan emas (Au) menuntut pengembangan metode recovery yang efisien dan ramah lingkungan sebagai alternatif proses konvensional toksik seperti sianidasi. Penelitian ini bertujuan untuk mengevaluasi efektivitas sistem elektrolisis berbasis membran Nano Chitosan Oligosaccharides (nano-COS), yang disintesis dari limbah cangkang udang, untuk recovery emas dari larutan berkadar rendah. Bijih emas refraktori dari Gorontalo dipraperlakuan melalui roasting dan acid baking sebelum diekstraksi menggunakan aqua regia, menghasilkan larutan leaching dengan konsentrasi emas awal 1,17 mg/L. Proses adsorpsi dalam sel elektrolisis diuji dengan memvariasikan jumlah membran (5 dan 10 membran) dan tegangan (0,9 V, 1,2 V, dan 1,5 V). Hasil penelitian menunjukkan kondisi optimal dicapai pada tegangan 0,9 V dengan 10 membran, menghasilkan efisiensi recovery emas tertinggi sebesar 92,31%. Peningkatan jumlah membran terbukti meningkatkan ketersediaan situs aktif, sementara kenaikan tegangan di atas 0,9 V justru menurunkan efisiensi akibat reaksi samping seperti elektrolisis air. Analisis isoterm mengindikasikan bahwa proses adsorpsi paling sesuai dengan model Freundlich (R² = 0,99704), yang menunjukkan mekanisme adsorpsi pada permukaan heterogen. Kapasitas adsorpsi maksimum teoretis (qmax), yang diestimasi menggunakan model Langmuir, mencapai 0,05419 mg/g. Secara keseluruhan, penelitian ini berhasil mendemonstrasikan bahwa sistem elektrolisis berbasis membran nano-COS merupakan alternatif yang sangat potensial, efektif, dan berkelanjutan untuk recovery emas dari larutan berkadar rendah.
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The continuously increasing demand for gold (Au) necessitates the development of efficient and environmentally benign recovery methods to replace toxic conventional processes such as cyanidation. This study aims to analyze the influence of membrane quantity and applied voltage on the effectiveness of gold recovery in an electrolysis based system utilizing a Nano Chitosan Oligosaccharides (nano-COS) membrane, synthesized from shrimp shell waste. Refractory gold ore from Gorontalo was pre-treated via roasting and acid baking before being extracted by aqua regia leaching, yielding a solution with an initial gold concentration of 1.17 mg/L. The adsorption process was conducted in an electrolysis cell by varying the number of membranes (5 and 10 membrane) and the applied voltage (0.9 V, 1.2 V, and 1.5 V). The results indicated that optimal conditions were achieved using 10 membrane layers at an applied voltage of 0.9 V, which yielded the highest gold recovery efficiency of 92.31%. Increasing the number of membranes was found to enhance the availability of active sites, whereas an increase in voltage above 0.9 V diminished the efficiency due to parasitic side reactions, such as water electrolysis. Isotherm analysis revealed that the adsorption process was best described by the Freundlich model (R² = 0.99704) for the 5 membrane system, indicating an adsorption mechanism on a heterogeneous surface. The maximum theoretical adsorption capacity (qmax), estimated from the Langmuir model, reached 0.05419 mg/g for the 10 membrane system.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Elektrolisis, Membran, Nano Chitosan Oligosaccharides, Tegangan, Recovery emas, Electrolysis, Membrane, Nano Chitosan Oligosaccharides, Voltage, Gold Recovery |
| Subjects: | Q Science > QD Chemistry > Polymerization Q Science > QD Chemistry > QD471 Chemical compounds - Structure and formulas Q Science > QD Chemistry > QD63 Extraction |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Razzan Herwiyoso |
| Date Deposited: | 30 Jul 2025 07:51 |
| Last Modified: | 30 Jul 2025 07:51 |
| URI: | http://repository.its.ac.id/id/eprint/124418 |
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