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All Journal REACTOR : Journal of Research On Chemistry And Engineering Scientica: Jurnal Ilmiah Sains dan Teknologi
Trisnawati, Iga
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Religion Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Energy Social Sciences Other

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OPTIMALISASI PRODUKSI OLIGOMER DARI KITOSAN HASIL EKSTRAKSI KEPALA UDANG MENGGUNAKAN APLIKASI IRADIASI GAMMA Trisnawati, Iga; Kurniawan, Deni; Ajri, Fauziah Ulfah; Sinurat, Febriyanti
Scientica: Jurnal Ilmiah Sains dan Teknologi Vol. 2 No. 8 (2024): Scientica: Jurnal Ilmiah Sains dan Teknologi
Publisher : Komunitas Menulis dan Meneliti (Kolibi)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.572349/scientica.v2i8.2262

Abstract

Limbah kepala dan cangkang udang sering dibuang dan menimbulkan masalah lingkungan. Limbah mengandung kitin, yang dapat diolah menjadi kitosan. Iradiasi gamma meningkatkan efisiensi produksi kitosan. Ini mempercepat ekstraksi kitin menjadi kitosan dan mendegradasi kitosan menjadi oligomer. Oligomer memiliki peran penting dalam industri dan nilai jual lebih tinggi. Penelitian ini bertujuan untuk mengoptimalkan produksi oligomer dari kitosan yang diekstraksi dari limbah udang menggunakan iradiasi gamma dengan dosis iradiasi dan konsentrasi asam asetat yang optimal sebagai langkah efisiensi proses degradasi kitosan menjadi oligomer. Kitosan dipreparasi dengan deproteinasi, demineralisasi, dan deasetilasi. Validasi kitosan dilakukan dengan uji organoleptik, sifat fisis, dan FTIR, sesuai Standar Nasional Indonesia No. 7949 Tahun 2013. Oligomer kitosan dibuat dengan ekstraksi kitosan dalam asam asetat dengan iradiasi gamma pada dosis 0, 10, 20, 30, dan 50 kGy serta konsentrasi asam asetat 2%, 5%, 10%, 15%, dan 20%. Hasil penelitian menunjukkan iradiasi 50 kGy efektif mengubah kitosan menjadi oligomer.
Efek Pre-Roasting Terhadap Parameter Kinetika Leaching Cr dari Limonit Prameswara, Gyan; Ulfah , Andi Nurfaadilah; Supriadi , Cipta Panghegar; Trisnawati, Iga; Petrus, Himawan Tri Bayu Murti
REACTOR: Journal of Research on Chemistry and Engineering Vol. 4 No. 2 (2023)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/

Abstract

Hydrometallurgical processes such as leaching of limonite ore to extract valuable metals including Ni and Co are often non-selective, including other metals in the leachate product. The leaching behavior of Cr from the chromite mineral contained in limonite ore is of concern due to the high Cr content of the leachate effluent. The pre-roasted process is frequently used to pre-treat limonite to increase the precious metal content. This study aims to determine the leaching behavior of Cr and the effect of pre-roasting on its kinetic parameters. The pre-roasting process was carried out at 280 and 610 oC for 4 hours. Observation of Cr leaching behavior was carried out in the leaching temperature range of 30-90 oC for 0-120 minutes using sulfuric acid solvent. The highest Cr recovery was achieved in pre-roasted ore leaching at 610 oC with leaching operating conditions of 2 M sulfuric acid, solid-liquid ratio of 5 g/50 mL, 200 rpm, for 120 minutes, at a leaching temperature of 90 oC, under these conditions Cr recovery reached 53.16%. The higher the roasting temperature, the lower the activation energy required for the leaching process. Cr leaching from raw and pre-roasted ore is controlled by the diffusion process through the ash layer with activation energies (EA) of 21.41, 18.64, and 14.71 kJ/mol for raw ore, pre-roasted ore 280 oC, and pre roasted ore 610 oC, respectively. The comparison of kinetics data from several roasting products for atmospheric leaching feeds will provide industry with information to integrated pyro-hydrometallurgical process to increase Cr production from laterite.
Co-Authors Ajri, Fauziah Ulfah Deni Kurniawan, Deni Gyan Prameswara Himawan Tri Bayu Murti Petrus Paliviana, Dheska Arthyka Sinurat, Febriyanti Supriadi , Cipta Panghegar Ulfah , Andi Nurfaadilah Y.M.V Mudayen