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      Evaluation of molybdenum recovery from sulfur removed spent catalyst using leaching and solvent extraction

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          Abstract

          In this article a new spent catalyst sample preparation method was implemented for the purpose of molybdenum leaching in a single step. Further molybdenum and vanadium in the leach liquor were separated and their concentrations were enriched using the solvent extraction and stripping techniques. The impervious sulfur (S 0) layer of the spent catalyst sample was removed using carbon disulfide (CS 2). The advantages of S 0removal were evaluated by conducting different sets of the Mo leaching experiments and they were further examined by varying different conditions such as three lixiviants, hydrogen peroxide (H 2O 2) addition, and three leaching parameters. The leaching rate increased in an order, e.g. acetone washed < acetone-CS 2 washed < acetone washed-H 2O 2 < acetone-CS 2 washed-H 2O 2, for the experimental concentration range of different lixiviants with the maximum of 94.8%(w/w) Mo dissolution in a single step. Optimization of the pulp density was important as the interaction of lixiviant molecules with multiple reacting solid particles decreased the driving force of the chemical reactions. The solvent extraction followed by the stripping technique was found to be excellent as the concentration of vanadium and molybdenum enriched from 0.55 to 1.9 M and 0.0448 to 1.08 M, respectively.

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          Performance study of magnesium-sulfur battery using a graphene based sulfur composite cathode electrode and a non-nucleophilic Mg electrolyte.

          Here we report for the first time the development of a Mg rechargeable battery using a graphene-sulfur nanocomposite as the cathode, a Mg-carbon composite as the anode and a non-nucleophilic Mg based complex in tetraglyme solvent as the electrolyte. The graphene-sulfur nanocomposites are prepared through a new pathway by the combination of thermal and chemical precipitation methods. The Mg/S cell delivers a higher reversible capacity (448 mA h g(-1)), a longer cyclability (236 mA h g(-1) at the end of the 50(th) cycle) and a better rate capability than previously described cells. The dissolution of Mg polysulfides to the anode side was studied by X-ray photoelectron spectroscopy. The use of a graphene-sulfur composite cathode electrode, with the properties of a high surface area, a porous morphology, a very good electronic conductivity and the presence of oxygen functional groups, along with a non-nucleophilic Mg electrolyte gives an improved battery performance.
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            Recovery of precious metals from electronic waste and spent catalysts: A review

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              A review of metal recovery from spent petroleum catalysts and ash

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                Author and article information

                Contributors
                debabratapradhan@soa.ac.in
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                6 February 2020
                6 February 2020
                2020
                : 10
                : 1960
                Affiliations
                [1 ]Biofuels and Bioprocessing Research Center, ITER, Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar, 751030 India
                [2 ]ISNI 0000 0001 0436 1602, GRID grid.410882.7, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), ; Daejeon, 305350 South Korea
                [3 ]ISNI 0000 0001 0722 6377, GRID grid.254230.2, Nano Engineering Division, School of Engineering, Chungnam National University, ; Daejeon, 305764 South Korea
                Author information
                http://orcid.org/0000-0003-4995-6882
                Article
                58972
                10.1038/s41598-020-58972-x
                7005004
                32029820
                45d24082-a704-4a9a-ba32-bb79b9e25dd8
                © The Author(s) 2020

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 20 June 2019
                : 17 January 2020
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                © The Author(s) 2020

                Uncategorized
                pollution remediation,chemical engineering
                Uncategorized
                pollution remediation, chemical engineering

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