Efektivitas Pengaruh Temperatur Proses Adsorpsi Dan Desorpsi Pada Hidrometalurgi Emas Berbasis Biosorpsi Menggunakan Nano Chitosan Oligosaccharide

Pradana, Raden Rifqi Renanda (2024) Efektivitas Pengaruh Temperatur Proses Adsorpsi Dan Desorpsi Pada Hidrometalurgi Emas Berbasis Biosorpsi Menggunakan Nano Chitosan Oligosaccharide. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Logam emas merupakan salah satu logam berharga yang memiliki potensi besar di Indonesia. Ekstraksi emas umumnya menggunakan sianida pada prosesnya. Tentunya hal tersebut memberikan dampak yang negatif bagi lingkungan karena sifat sianida yang beracun. Salah satu metode ekstraksi ramah lingkungan yang dapat digunakan adalah metode biosorpsi menggunakan kitosan pada proses recovery. Proses recovery adalah proses pengambilan logam berharga dari larutan hasil leaching. Proses recovery sendiri terbagi menjadi dua, yaitu adsorpsi dan desorpsi. Tujuan penelitian ini adalah untuk menganalisis pengaruh temperatur adsorpsi dan desorpsi pada proses hidrometalurgi emas agar proses biosorpsi logam emas menggunakan kitosan berjalan dengan optimal. Adsorpsi dilakukan selama 4 jam dengan kecepatan agitasi 200 rpm dan pH 1,75. Variasi yang digunakan untuk temperatur adsorpsi adalah 35 ˚C, 45 ˚C, dan 55˚C. Sedangkan variasi temperatur desorpsi yang digunakan adalah 40 ˚C, 45 ˚C, dan 50˚C. Bahan yang digunakan adalah ore yang diperoleh dari Gorontalo, Indonesia. Ore dilakukan pengujian XRD dan EDX untuk menganalisis kandungannya. Sebelum melakukan proses adsorpsi, diperlukan proses grinding, roasting, dan leaching untuk melarutkan emas. Larutan leaching dilakukan pengujian AAS dan UV-Vis untuk mengetahui konsentrasi emas di dalam larutan leaching. Sedangkan membran kitosan yang dibuat menggunakan PVA-GA-kitosan dilakukan uji FTIR. Proses adsorpsi dilakukan dengan melakukan pencelupan membran kitosan kedalam 20 ml larutan leaching. Setelah itu dilakukan pengujian UV-Vis pada larutan sisa adsorpsi dan dilakukan uji FTIR dan SEM-EDX Mapping pada membran kitosan. Proses desorpsi dilakukan dengan mencelupkan membran kitosan hasil adsorpsi ke dalam larutan desorpsi berupa EDTA 0,1 M. Dari hasil penelitian didapatkan variasi temperatur adsorp 55 oC memiliki daya adsorpsi paling baik sebesar 173,67 ppm, sedangkan variasi temperatur adsorp 35 oC memiliki daya adsorpsi paling rendah sebesar 59,16 ppm. Untuk variasi temperatur desorp, terlihat bahwa semakin tinggi temperatur, pergeseran panjang gelombang (wavelength) semakin besar. Berdasarkan hasil pengujian dan analisis temperatur desorp 50oC dengan adsorp 45oC terlihat menunjukkan pergeseran peak yang lebih lebar dari variasi temperatur yang lain disertai hasil FTIR membran yang hampir menyerupai semula.
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Gold metal is one of the valuable metals that has great potential in Indonesia. Gold extraction generally uses cyanide in the process. Of course, this has a negative impact on the environment due to the toxic nature of cyanide. One of the environmentally friendly extraction methods that can be used is the biosorption method using chitosan in the recovery process. The recovery process is the process of retrieving valuable metals from the leaching solution. The recovery process itself is divided into two, namely adsorption and desorption. The purpose of this research is to analyze the effect of adsorption and desorption temperatures on the gold hydrometallurgy process so that the gold metal biosorption process using chitosan runs optimally. Adsorption was carried out for 4 hours with an agitation speed of 200 rpm and pH 1.75. The variations used for adsorption temperature were 35 ˚C, 45 ˚C, and 55˚C. While the desorption temperature variations used were 40 ˚C, 45 ˚C, and 50˚C. The material used is ore obtained from Gorontalo, Indonesia. Ore was subjected to XRD and EDX testing to analyze its content. Prior to the adsorption process, grinding, roasting, and leaching are required to dissolve the gold. The leaching solution was subjected to AAS and UV-Vis testing to determine the concentration of gold in the leaching solution. While the chitosan membrane made using PVA-GA-chitosan was carried out FTIR test. The adsorption process was carried out by dipping the chitosan membrane into 20 ml of leaching solution. After that, UV-Vis testing was carried out on the remaining adsorption solution and FTIR and SEM-EDX Mapping tests were carried out on the chitosan membrane. The desorption process was carried out by dipping the adsorbed chitosan membrane into a desorption solution in the form of 0.1 M EDTA. From the results, it was found that the 55 oC adsorption temperature variation had the best adsorption power of 173.67 ppm, while the 35 oC adsorption temperature variation had the lowest adsorption power of 59.16 ppm. For desorp temperature variations, it can be seen that higher the temperature, the greater the wavelength shift. Based on the results of testing and analysis of desorp temperature 50 oC with adsorp 45 oC, it appears to show a wider peak shift than other temperature variations accompanied by membrane FTIR results that almost resemble the original membrane.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Adsorption, Chitosan, Desorption, Gold, Temperature, Adsorpsi, Desorpsi, Emas, Kitosan, Temperatur
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:	R. Rifqi Renanda P.
Date Deposited:	01 Aug 2024 07:20
Last Modified:	17 Sep 2024 05:42
URI:	http://repository.its.ac.id/id/eprint/110915

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