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Song Q, Tong X, Dai P, Xie X, Xie R, Fan P, Ma Y, Chen H. Activation Mechanism of Fe 2+ in Pyrrhotite Flotation: Microflotation and DFT Calculations. Molecules 2024; 29:1490. [PMID: 38611768 PMCID: PMC11013166 DOI: 10.3390/molecules29071490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 03/22/2024] [Accepted: 03/22/2024] [Indexed: 04/14/2024] Open
Abstract
In industrial manufacturing, pyrrhotite(Fe1-xS), once depressed, is commonly activated for flotation. However, the replacement of CuSO4 is necessary due to the need for exact control over the dosage during the activation of pyrrhotite, which can pose challenges in industrial settings. This research introduces the use of FeSO4 for the first time to efficiently activate pyrrhotite. The impact of two different activators on pyrrhotite was examined through microflotation experiments and density functional theory (DFT) calculations. Microflotation experiments confirmed that as the CuSO4 dosage increased from 0 to 8 × 10-4 mol/L, the recovery of pyrrhotite initially increased slightly from 71.27% to 87.65% but then sharply decreased to 16.47%. Conversely, when the FeSO4 dosage was increased from 0 to 8 × 10-4 mol/L, pyrrhotite's recovery rose from 71.27% to 82.37%. These results indicate a higher sensitivity of CuSO4 to dosage variations, suggesting that minor alterations in dosage can significantly impact its efficacy under certain experimental conditions. In contrast, FeSO4 might demonstrate reduced sensitivity to changes in dosage, leading to more consistent performance. Fe ions can chemically adsorb onto the surface of pyrrhotite (001), creating a stable chemical bond, thereby markedly activating pyrrhotite. The addition of butyl xanthate (BX), coupled with the action of Fe2+ on activated pyrrhotite, results in the formation of four Fe-S bonds on Fe2+. The proximity of their atomic distances contributes to the development of a stable double-chelate structure. The S 3p orbital on BX hybridizes with the Fe 3d orbital on pyrrhotite, but the hybrid effect of Fe2+ activation is stronger than that of nonactivation. In addition, the Fe-S bond formed by the addition of activated Fe2+ has a higher Mulliken population, more charge overlap, and stronger covalent bonds. Therefore, Fe2+ is an excellent, efficient, and stable pyrrhotite activator.
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Affiliation(s)
| | | | | | | | | | | | | | - Hang Chen
- Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China; (Q.S.); (X.T.); (P.D.); (X.X.); (R.X.); (P.F.); (Y.M.)
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2
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Yang T, Dangi BB, Thomas AM, Kaiser RI, Sun BJ, Staś M, Chang AHH. Gas-Phase Synthesis of the Elusive Trisilicontetrahydride Species (Si 3H 4). J Phys Chem Lett 2017; 8:131-136. [PMID: 27959543 DOI: 10.1021/acs.jpclett.6b02710] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The bimolecular gas-phase reaction of ground-state atomic silicon (Si; 3P) with disilane (Si2H6; 1A1g) was explored under single-collision conditions in a crossed molecular beam machine at a collision energy of 21 kJ mol-1. Combined with electronic structure calculations, the results suggest the formation of Si3H4 isomer(s) along with molecular hydrogen via indirect scattering dynamics through Si3H6 collision complex(es) and intersystem crossing from the triplet to the singlet surface. The nonadiabatic reaction dynamics can synthesize the energetically accessible singlet Si3H4 isomers in overall exoergic reaction(s) (-93 ± 21 kJ mol-1). All reasonable reaction products are either cyclic or hydrogen-bridged suggesting extensive isomerization processes from the reactants via the initially formed collision complex(es) to the fragmenting singlet intermediate(s). The underlying chemical dynamics of the silicon-disilane reaction are quite distinct from the isovalent carbon-ethane system that does not depict any reactivity at all, and open the door for an unconventional gas phase synthesis of hitherto elusive organosilicon molecules under single-collision conditions.
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Affiliation(s)
- Tao Yang
- Department of Chemistry, University of Hawai'i at Manoa , Honolulu, Hawaii 96822, United States
| | - Beni B Dangi
- Department of Chemistry, University of Hawai'i at Manoa , Honolulu, Hawaii 96822, United States
| | - Aaron M Thomas
- Department of Chemistry, University of Hawai'i at Manoa , Honolulu, Hawaii 96822, United States
| | - Ralf I Kaiser
- Department of Chemistry, University of Hawai'i at Manoa , Honolulu, Hawaii 96822, United States
| | - Bing-Jian Sun
- Department of Chemistry, National Dong Hwa University , Shoufeng, Hualien 974, Taiwan
| | - Monika Staś
- Department of Physical Chemistry and Molecular Modeling, Opole University , 45-052 Opole, Poland
| | - Agnes H H Chang
- Department of Chemistry, National Dong Hwa University , Shoufeng, Hualien 974, Taiwan
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Benmensour MA, Djennane-Bousmaha S, Boucekkine A. DFT study of sulfur derivatives of cumulenes and their protonated forms of interstellar interest and calculations of dissociation energies of protonated forms (SC(CH)C(n-2)S)(+) (n = 3-8). J Mol Model 2014; 20:2295. [PMID: 24935110 DOI: 10.1007/s00894-014-2295-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Accepted: 05/05/2014] [Indexed: 10/25/2022]
Abstract
A theoretical study of the sulfur cumulenes SCnS (n = 3-8), CnS ( n = 1-8) and of their protonated forms (SCnS)H(+) and (CnS)H(+) that might exist in the interstellar environment, has been carried out by means of the standard B3LYP/6-311G** method. The geometries and relative energies of singlet and triplet states according to the number of carbons have been computed. Like neutral species, we have found that the ground state of the most stable protonated forms (SC(CH)Cn-2S)(+) and ((HC)Cn-1S)(+), alternates between a triplet state for the even series and a singlet state for the odd series. We provided the data needed to simulate infrared and microwave spectra (vibration frequencies, dipole moments, and rotational constants) for each protonated species (SCnS)H(+) and (CnS)H(+) and for each neutral CnS species. The computing of dissociation energies of the most stable protonated forms (SC(CH)Cn-2S)(+) (n = 3-8) has shown that the lowest values are obtained for the dissociation of compounds with an even number of carbons, in their triplet state, which produce the observed fragments CS and C3S. The dissociation of even protonated forms requires less energy than for the odd protonated forms.
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Affiliation(s)
- Mohamed Ali Benmensour
- Laboratoire de Thermodynamique et Modélisation Moléculaire, Faculté de Chimie, U.S.T.H.B, BP 32 El Alia, 16111, Bab Ezzouar, Algiers, Algeria
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4
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Shainyan BA, Chipanina NN, Oznobikhina LP, Danilevich YS. The structure and proton affinity of N-benzyl-N-(allenyl)trifluoromethanesulfonamide: FT-IR, DFT and ab initio
study, NBO analysis. J PHYS ORG CHEM 2013. [DOI: 10.1002/poc.3147] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- B. A. Shainyan
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of the Russian Academy of Science; 1 Favorsky Str. 1 664033 Irkutsk Russia
| | - N. N. Chipanina
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of the Russian Academy of Science; 1 Favorsky Str. 1 664033 Irkutsk Russia
| | - L. P. Oznobikhina
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of the Russian Academy of Science; 1 Favorsky Str. 1 664033 Irkutsk Russia
| | - Yu. S. Danilevich
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of the Russian Academy of Science; 1 Favorsky Str. 1 664033 Irkutsk Russia
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Zhao SC, Ji KG, Lu L, He T, Zhou AX, Yan RL, Ali S, Liu XY, Liang YM. Palladium-Catalyzed Divergent Reactions of 1,6-Enyne Carbonates: Synthesis of Vinylidenepyridines and Vinylidenepyrrolidines. J Org Chem 2012; 77:2763-72. [DOI: 10.1021/jo202590w] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Shu-Chun Zhao
- State Key
Laboratory of Applied Organic Chemistry,
Lanzhou University, and State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics, Chinese Academy of Science,
Lanzhou 730000, P.R. China
| | - Ke-Gong Ji
- State Key
Laboratory of Applied Organic Chemistry,
Lanzhou University, and State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics, Chinese Academy of Science,
Lanzhou 730000, P.R. China
| | - Lei Lu
- State Key
Laboratory of Applied Organic Chemistry,
Lanzhou University, and State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics, Chinese Academy of Science,
Lanzhou 730000, P.R. China
| | - Ting He
- State Key
Laboratory of Applied Organic Chemistry,
Lanzhou University, and State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics, Chinese Academy of Science,
Lanzhou 730000, P.R. China
| | - An-Xi Zhou
- State Key
Laboratory of Applied Organic Chemistry,
Lanzhou University, and State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics, Chinese Academy of Science,
Lanzhou 730000, P.R. China
| | - Ru-Long Yan
- State Key
Laboratory of Applied Organic Chemistry,
Lanzhou University, and State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics, Chinese Academy of Science,
Lanzhou 730000, P.R. China
| | - Shaukat Ali
- State Key
Laboratory of Applied Organic Chemistry,
Lanzhou University, and State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics, Chinese Academy of Science,
Lanzhou 730000, P.R. China
| | - Xue-Yuan, Liu
- State Key
Laboratory of Applied Organic Chemistry,
Lanzhou University, and State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics, Chinese Academy of Science,
Lanzhou 730000, P.R. China
| | - Yong-Min Liang
- State Key
Laboratory of Applied Organic Chemistry,
Lanzhou University, and State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics, Chinese Academy of Science,
Lanzhou 730000, P.R. China
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6
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Petrar P, Nemes G, Silaghi-Dumitrescu I, Escudié J, Ranaivonjatovo H. An insight into the structure of model germaphosphaallenes. Mol Phys 2010. [DOI: 10.1080/00268970902780288] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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A theoretical investigation into dimethylcarbene and its diamino and diphosphino analogs: effects of cyclization and unsaturation on the stability and multiplicity. J PHYS ORG CHEM 2009. [DOI: 10.1002/poc.1540] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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8
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Affiliation(s)
- Peter K. Freeman
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331
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9
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Azizoglu A, Balci M, Mieusset JL, Brinker UH. Substituent Effects on the Ring-Opening Mechanism of Lithium Bromocyclopropylidenoids to Allenes. J Org Chem 2008; 73:8182-8. [DOI: 10.1021/jo8011144] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Akin Azizoglu
- Department of Chemistry, University of Balikesir, TR-10145, Balikesir, Turkey, Department of Chemistry, Middle East Technical University, TR-06531, Ankara, Turkey, and Chair of Physical Organic and Structural Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, A-1090 Vienna, Austria
| | - Metin Balci
- Department of Chemistry, University of Balikesir, TR-10145, Balikesir, Turkey, Department of Chemistry, Middle East Technical University, TR-06531, Ankara, Turkey, and Chair of Physical Organic and Structural Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, A-1090 Vienna, Austria
| | - Jean-Luc Mieusset
- Department of Chemistry, University of Balikesir, TR-10145, Balikesir, Turkey, Department of Chemistry, Middle East Technical University, TR-06531, Ankara, Turkey, and Chair of Physical Organic and Structural Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, A-1090 Vienna, Austria
| | - Udo H. Brinker
- Department of Chemistry, University of Balikesir, TR-10145, Balikesir, Turkey, Department of Chemistry, Middle East Technical University, TR-06531, Ankara, Turkey, and Chair of Physical Organic and Structural Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, A-1090 Vienna, Austria
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10
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Kakkar R, Dua A, Zaidi S. Density functional study of the conformations and intramolecular proton transfer in thiohydroxamic acids. Org Biomol Chem 2007; 5:547-57. [PMID: 17252138 DOI: 10.1039/b610899g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The conformational preferences of thiohydroxamic acids (N-hydroxythioamides) are investigated by the density functional B3LYP/6-311++G(3df,3pd)//B3LYP/6-31G(d) method in this work. Unlike hydroxamic acids, the thione and thiol forms are found to be equally stable in the gas phase, and the reaction pathways for the interconversion between the thione and thiol forms have been deduced to involve rotation about the C[double bond, length as m-dash]N bond of the thiol tautomer in the rate-determining step. The effect of aqueous solvation on the reactions has also been investigated. It is found that inclusion of a few explicit water molecules in an implicit solvent calculation is necessary in order to accurately account for hydrogen bonding effects. Thiohydroxamic acids, like their hydroxamic acid analogues, are found to be N-acids, both in the gas phase and in aqueous solution.
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Affiliation(s)
- Rita Kakkar
- Department of Chemistry, University of Delhi, Delhi, 110 007, India.
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11
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Dinadayalane TC, Priyakumar UD, Sastry GN. Exploration of C6H6 Potential Energy Surface: A Computational Effort to Unravel the Relative Stabilities and Synthetic Feasibility of New Benzene Isomers. J Phys Chem A 2004. [DOI: 10.1021/jp0467696] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- T. C. Dinadayalane
- Molecular Modeling Group, Organic Chemical Sciences, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - U. Deva Priyakumar
- Molecular Modeling Group, Organic Chemical Sciences, Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - G. Narahari Sastry
- Molecular Modeling Group, Organic Chemical Sciences, Indian Institute of Chemical Technology, Hyderabad 500 007, India
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