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Journal : Jurnal Sains Dasar

RECOVERY OF GOLD (Au) AND SILVER (Ag) METALS IN THE ELECTRONIC WASTE THROUGH MULTILEVEL PRECIPITATION PROCESS Marwati, Siti; Padmaningrum, Regina Tutik; Sunarto, Sunarto
Jurnal Sains Dasar Vol 4, No 2 (2015): Jurnal Sains Dasar
Publisher : Yogyakarta State University

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Abstract

This research aims to determine the percent recovery of gold (Au) and silver (Ag) in the electronic waste such as CD-RW and determine the purity of gold and silver metals in the electronic waste such as CD-RW that through multilevel precipitation process. The first step was the optimization of the concentration of thiourea and time dissolution of gold and silver in the sample. The concentration of thiourea and the time dissolution optimum obtained from conentration of gold and silver maximum. By The percent recovery of gold and silver are determined by comparing the concentration of gold and silver between in the solution sample and in the sample without dissolution that be analyzed by XRF. The scond step was the multilevel precipitation process and calcination. Precipitation and calcination of the filtrat was dissolution results in the optimum condition. Reagent used was a solution of hydrochloric acid and potassium carbonate. The precipitation gold and silver produced from the precipitation of dissolution again and then be analyzed by atomic absorption spectrophotometry. The purity was determined by comparing the weight of gold and silver between in the precipitate and in the solution.  The results of this research showed that the percent recovery of the silver in the CD-RW through the process dissolution with thiourea 10 g/L and 4 hours soaking time were 21.09 %. The purity silver preipitate were 0.15 %. The percent recovery and the purity of gold can  not be determined because the gold contained in the sample were not detected or below the limit of detection equipment. Keywords: recovery, gold, silver, electronic  waste
THERMODINAMIC PARAMETERS ON THE SORPTION OF PHOSPHATE IONS BY MONTMORILLONITE Jaslin, Ikhsan; Endang, Wijayanti; Sunarto, Sunarto
Jurnal Sains Dasar Vol 4, No 1 (2015): Jurnal Sains Dasar
Publisher : Yogyakarta State University

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Abstract

The sorption of phosphate by montmorillonite at 10, 30, and 50 oC were investigated aiming to mainly determine thermodynamic parameters for the formation of surface complexes in the adsorption of phosphate ions by montmorillonite. Data were collected by adsorption edge experiments investigating the effect of pH, adsorption isotherms enabling the effect of sorbate concentration, and acid-base titration calculating protons released or taken up by adsorption process. Data analysis was carried out using surface complexation model to fit the data collected in this study using the parameters obtained from previous study, as well as to calculate the values of ΔH and ΔS. Previous study reported that phosphate ions formed two outer-sphere surface complexes with active sites of montmorillonite through hydrogen bonding. In the first complex,  [(XH)0– H2L─]─, the phosphate was held to permanent-charge X─ sites on the tetrahedral siloxane faces, and the second complex, [[(SO─)(SOH)]– – [H2L]─] 2─ was formed through the interaction between the phosphate and variable charge surface hydroxyl groups at the edges of montmorillonite crystals and on the octahedral alumina faces. The values of ΔH for the first and second reactions are 39.756 and 3.765x10-7 kJ mol‒1 respectively. Since both reactions have positive enthalpy values, it can be concluded that the reactions are endothermic. Large energy for the first reaction is needed by X─  sites (permanent negatively charge sites of montmorillonite) to be partially desolvated, on which K+ or other surface cations are replaced by H+ ions in the surface protonated process, and are then ready to interact phosphate ions in the solution. Small values of ΔH for the second reactions indicates that hydrogen bonds formed by phosphate and SOH sites in the second reaction are easily broken out, and the phosphate can easily desorbed from the surface. The values of ΔS for the first and second reactions are 122.523 and 2.393 x10-2  J K‒1 mol‒1, which are greater than -10 kJ mol‒1 and indicates that the surface reactions occurs through dissociative mechanisms.Keywords:   montmorillonite, adsorption edge, extended constant capacitance, surface complexation model, enthalpy, reaction mechanisms
Co-Authors 08.05.52.0064 Novi Perwitasari 09.05.52.0075 Lia Yuliana 10.05.52.0010 Dwi Sulistyowati 10.05.52.0030 Christina Dewi 12.05.52.0210 Resty Andini Putri, 12.05.52.0210 12.52.02.0204 Kinayah, 12.52.02.0204 12.5202.0172 Sukowati 1352020069 Prijatno Sri Eko Putranto, 1352020069 1352020070 Teguh Purnomo, 1352020070 1352020104 Pujadi, 1352020104 1352020105 SRI HERANINGSIH, 1352020105 A, Reo A. Samik Wahab, A. Samik Abas, Abas Abdurrachman, Mirzam Adi Nugroho Adi Ratriyanto Adnan Sofyan Afiana Praditasari, Afiana Agres Vivi Susanti Agung Budi Raharjo Agung Budiharjo Agus Candra Agus Naryoso Agus Prasetyo Budi Agustian Ipa Aji Setiawan Alim, Muhamad Miftahul Alimuna, Wa Allen Yeoh, Allen Amalia Yunika Putri, 13.05.52.0204 Ana, Testian Yushli Anada Leo Virganta, Anada Leo Andi Suhardiyanto Andriani, Beti Angga Dwi Pratama, 14.05.52.0003 Angga Widhi Saputro Anggun Parameswari, Anggun Anindya Ratna Pratiwi Annisa Arum Putri Anton Styo Wibowo, Anton Styo Ardang, Rifvan Yuniar Ari Setyowati Arief, Ahmad Fikri ARIF INDIARTO, ARIF Arifin Arifin Arintina Rahayuni Ariyanti, Wahyu Arizona, Meivy Armeina Nur Rachmawati ARTINI PANGASTUTI Arum, Rizki Sekar Asri Nugraheningtyas Astuti, Satria Dwi Aulia, Vina Auliya Hakim, Muhammad Andi Avi Budi Setiawan Ayi Yustiati Azhari Azhari Azizzah, Farah B. Setiawan Baedhowi Baedhowi Bagus Indrawan, Bagus Bambang Sigit Bambang Wasito Adi Bardi Murachman Baskoro Adi Prayitno Bayu Setya Hertanto Bungaran, Andreas Cahyo, Reza Dwi cahyono, hadi Carlina Soetjiono Chairunnisa Chairunnisa Chandra Wijaya Condro Hadi Mulyono, Condro Hadi David David Dawa, Willy DEWI IRAWATI Dewi Kusuma Wardani Dhimas Arvico, 13.05.52.0138 Djarot Sadharto, Djarot Djati Mardiatno Dwi Pratama, 14.05.52.0003 Angga Dwi Ratnawati, Dwi Dyah Nur Subandriani, Dyah Nur EDWI MAHAJOENO Eka Kusumawati, Eka Eka Wahyudi Eko Haryono Eko Mujiyanto, 13.05.52.0092 Ekowati, Yunik Endah Tri Wahyuni Endang Widjayanti LFX Endarti, Tutik Dwi Enik Sulistyowati Erland, Radja Ernawan Setyono Eryani, Riris Euis Soliha F.X. 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