Gustara, Ken Youdan Marcel (2025) Pengaruh Siklus Penggunaan Membran Nano Kitosan Oligosakarida (COS) terhadap Efektivitas Adsorpsi pada Recovery Emas dengan Metode Elektrolisis. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Emas adalah logam mulia dengan nilai ekonomi yang sangat tinggi sehingga menjadi salah satu komoditas paling diminati di berbagai sektor industri. Ekstraksi emas umumnya menggunakan sianida sebagai pelarut dan karbon aktif sebagai adsorben, namun metode ini berdampak negatif terhadap lingkungan karena sifat toksiknya. Sebagai alternatif yang lebih ramah lingkungan, metode biosorpsi menggunakan nano-chitosan oligosaccharide (COS), biopolimer alami dari kitin, dapat diterapkan untuk proses recovery emas. Penelitian ini bertujuan untuk mengetahui pengaruh jumlah siklus penggunaan ulang (reusable) membran nano-COS terhadap efisiensi adsorpsi emas (Au) dengan metode elektrolisis, serta mengetahui berapa siklus membran tersebut dapat dipakai. Proses recovery dilakukan dengan leaching bijih emas menggunakan larutan aqua regia (HCl:HNO₃ = 3:1) untuk melarutkan Au, diikuti adsorpsi pada membran nano-COS yang dikombinasikan dengan elektrolisis. Variabel utama yang diamati adalah jumlah siklus penggunaan membran (hingga tiga siklus) dengan konfigurasi 5 dan 10 membran, sedangkan parameter lain seperti waktu, tegangan, pH, dan temperatur dijaga konstan. Pengujian dilakukan menggunakan Atomic Absorption Spectroscopy (AAS) untuk mengetahui efisiensi adsorpsi emas, Fourier Transform Infrared Spectroscopy (FTIR) untuk mengidentifikasi perubahan gugus fungsional pada membran, serta Energy Dispersive X-ray (EDX), X-ray Fluorescence (XRF), dan X-ray Diffraction (XRD) untuk mengkarakterisasi unsur dan senyawa raw sebelum dan sesudah proses adsorpsi. Hasil uji AAS menunjukkan efisiensi adsorpsi emas menurun seiring bertambahnya siklus. Pada konfigurasi 10 membran, efisiensi turun dari 92,31% (siklus pertama) menjadi 41,03% (siklus ketiga), sedangkan pada 5 membran turun dari 50,43% menjadi 29,91%. Penelitian ini menyimpulkan bahwa membran nano-COS dapat digunakan hingga tiga siklus dengan penurunan efisiensi yang signifikan.
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Gold is a precious metal with exceptionally high economic value, making it one of the most sought-after commodities across various industrial sectors. Conventional gold extraction methods typically involve the use of cyanide as a leaching agent and activated carbon as an adsorbent, which pose significant environmental hazards due to their toxic nature. As a more environmentally friendly alternative, the biosorption method using nano-chitosan oligosaccharide (COS), a natural biopolymer derived from chitin, can be applied for gold recovery. This study aims to investigate the effect of reusable nano-COS membrane cycles on the adsorption efficiency of gold (Au) using the electrolysis method, as well as to determine how many times the membrane can be reused effectively. The gold recovery process was conducted by leaching gold ore using aqua regia solution (HCl:HNO₃ = 3:1) to dissolve Au, followed by adsorption using the nano-COS membrane in combination with electrolysis. The primary variable observed was the number of membrane reuse cycles (up to three cycles) with configurations of 5 and 10 membranes, while other parameters such as time, voltage (0.9 V), pH, and temperature were kept constant. Characterization and testing were conducted using Atomic Absorption Spectroscopy (AAS) to determine gold adsorption efficiency, Fourier Transform Infrared Spectroscopy (FTIR) to identify changes in functional groups on the membrane, as well as Energy Dispersive X-ray (EDX), X-ray Fluorescence (XRF), and X-ray Diffraction (XRD) to characterize the elemental and compound composition of raw materials before and after the adsorption process. AAS results showed a decline in gold adsorption efficiency with increasing reuse cycles. In the 10-membrane configuration, the efficiency decreased from 92.31% (first cycle) to 41.03% (third cycle), while in the 5-membrane configuration, it decreased from 50.43% to 29.91%. This study concludes that the nano-COS membrane can be effectively reused for up to three cycles, with a significant reduction in adsorption efficiency.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Adsorpsi, Elektrolisis, Emas, Kitosan, Reusable Adsorption, Chitosan, Electrolysis, Gold, Reusable |
| Subjects: | T Technology > TN Mining engineering. Metallurgy > TN688 Hydrometallurgy |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Ken Youdan Marcel Gustara |
| Date Deposited: | 30 Jul 2025 09:41 |
| Last Modified: | 30 Jul 2025 09:41 |
| URI: | http://repository.its.ac.id/id/eprint/124396 |
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