Efektivitas pH Dan Temperatur Terhadap Daya Adsorpsi Membran Kitosan Sebagai Adsorben Logam Emas Pada Proses Hidrometalurgi

Pradayan, Radithya Sandya (2023) Efektivitas pH Dan Temperatur Terhadap Daya Adsorpsi Membran Kitosan Sebagai Adsorben Logam Emas Pada Proses Hidrometalurgi. 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 pada larutan hasil leaching. Proses recovery sendiri terbagi menjadi dua, adsorpsi dan desorpsi pada larutan leaching. Tujuan penelitian ini adalah untuk menganalisis pengaruh pH dan temperatur terhadap daya adsorpsi membran kitosan serta efisiensi adsorpsi pada proses hidrometalurgi. Adsorpsi dilakukan selama 4 jam dengan kecepatan agitasi 200 rpm. Variasi yang digunakan untuk pH adalah 0,75, 1,25, dan 1,75. Sedangkan variasi temperatur yang digunakan adalah 30 oC, 37,5 oC , dan 45 oC. Bahan yang digunakan adalah ore yang diperoleh dari Gorontalo, Indonesia. Ore dilakukan pengujian XRD dan EDX untuk menganalisis kandungannya. Untuk menyiapkan larutan adsorpsi, diperlukan proses grinding, roasting, dan leaching untuk melarutkan emas. Larutan leaching dilakukan pengujian ICP-OES 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 pada membran kitosan. Pada proses desorpsi dilakukan dengan menggunakan larutan EDTA 0,1 M. Dari hasil penelitian didapatkan variasi pH 1,75 dan temperatur 45 oC memiliki daya adsorpsi paling baik sebesar 195,68 ppm dan efisiensi sebesar 46,32%, Sedangkan variasi pH 0,75 dan temperatur 30 oC memiliki daya adsorpsi dan efisiensi paling rendah sebesar 140,86 ppm dan 23,83%.
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Gold metal is one of the precious metals that has big potential in Indonesia. Gold extraction generally uses cyanide in the process. Eventually, this has a negative impact on the environment due to the toxic nature of cyanide. One of the environmentally friendly gold extraction methods that can be used is the biosorption method using chitosan in the recovery process. Recovery process is the process of taking precious metals from the leaching solution. The process itself is divided into two steps, adsorption and desorption. The purpose of this study was to analyze the effect of pH and temperature on the adsorption capacity of chitosan membranes and the adsorption efficiency in hydrometallurgical processes. Adsorption was carried out for 4 hours with an agitation speed of 200 rpm. The variations used for pH were 0,75, 1,25 and 1,75. While the temperature variations used were 30 oC, 37,5 oC and 45 oC. The materials used are gold minerals obtained from Gorontalo, Indonesia. Gold minerals are subjected to XRD and EDX testing to analyze their elemental content. To prepare the adsorption solution, processes such as leaching, roasting, and grinding are necessary to dissolve the gold into the leaching solution. The leaching solution was tested for ICP-OES and UV-Vis to determine the concentration of gold in the leaching solution. Meanwhile, the chitosan membrane made using PVA-GA-chitosan was subjected to the FTIR test. The adsorption process was carried out by immersing the chitosan membrane into the leaching solution. After that, UV-Vis testing was carried out on the remaining adsorption solution and FTIR dan SEM-EDX Mapping tests were carried out on chitosan membrane. The desorption process was carried out using 0.1 M EDTA solution. From the results of the study, it was found that variations in pH 1.75 and temperature 45 oC has the best adsorption capacity with the number 195.68 ppm and an efficiency was 46.32%. While variation of pH 0.75 and temperature 30 oC has the lowest adsorption capacity and efficiency with the number 140.86 ppm and 23.83%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Adsorpsi, Emas, Kitosan, pH, Temperatur, Adsorption, Gold, Chitosan, Temperature
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:	Radithya Sandya Pradayan
Date Deposited:	20 Jul 2023 05:50
Last Modified:	20 Jul 2023 05:50
URI:	http://repository.its.ac.id/id/eprint/98690

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