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All Journal Indonesian Chimica Letters
Suwardiyanto
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Chemistry

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Hydrothermal Synthesis of Hematite (α-Fe2O3) from Indonesia Iron Sand Furqonul Hakin Al Hadi; Tanti Haryati; Novita Andarini; Suwardiyanto; Sulistiyo, Yudi Aris
Indonesian Chimica Letters Vol. 2 No. 1 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v2i1.367

Abstract

High potency of Indonesian iron sand can be optimized by transforming to valuable iron oxide product namely Hematite (α-Fe2O3). Hydrothermal synthesis was carried out to transform iron oxide phase to hematite that can be analyzed by x-ray diffraction method. Utilization of ion sand as raw material produced multyphase in product reaction, while  the usage of Fe(OH)x that extracted from iron sand attained high purity of hematite. The best conditions of reaction were at 160 oC for 24 h. Higher temperature and longer time reaction transformed α- α-Fe2O3 to be γ-Al2O3 and Fe3O4 as more stable phase.
Synthesis and Characterisation of Bentonite/Poly(Acrylic Acid) Hybrid Material for Its Application as A Catalyst in Esterification of Glycerol with Acetic Acid Sholehah, Hidayati Nur Mohammad; Suwardiyanto; Tanti Haryati; Novita Andarini; Sulistiyo, Yudi Aris
Indonesian Chimica Letters Vol. 3 No. 1 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v3i1.798

Abstract

Bentonite/poly(acrylic acid) (BTAA) hybrid material commonly applied as superabsorbent was prepared via intercalation method coupled with in situ polymerisation of partially neutralised acrylic acid monomers. The structural characteristics of various BTAA ratios and their constituents were scrutinised using XRF, XRD, and FTIR. Basal spacing of BTAA hybrid materials decreased as a result of intercalation with polyacrylic acid. Interaction between bentonite and polyacrylic acid was also observed in the shifting and reduced intensity of O–H, C=O, and Si–O–Al absorption bands. Catalytic activity of BTAA was investigated through its ability to facilitate the esterification reaction of glycerol with acetic acid. The result suggests that catalytic activity is present in BTAA hybrid materials, as evidenced by the production of monoacetin and triacetin.
Effectiveness of Gold Extraction with Thiourea Solution from Gold Rocks in Mount Tumpang Pitu Pasanggaran Banyuwangi Andarini, Novita; Ramadhani, Ferlia Suci; Haryati, Tanti; Suwardiyanto
Indonesian Chimica Letters Vol. 3 No. 2 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/icl.v3i2.4107

Abstract

This research aims to determine the effect of adding an oxidizing solution in the gold extraction process using thiourea solution. The oxidizing agent used in thiourea leaching solution is FeCl3. Variations of additional volume of oxidizing solution are 0 mL, 10 mL, 20 mL, 30 mL, and 40 mL. Based on the results obtained, the addition of 30 mL oxidant FeCl3 can get optimal results. The thiourea leaching solution can extract gold as much as 46.7%.
Co-Authors Furqonul Hakin Al Hadi Novita Andarini Novita Andarini Ramadhani, Ferlia Suci Sholehah, Hidayati Nur Mohammad Tanti Haryati Yudi Aris Sulistiyo, Yudi Aris