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Levanov AV, Isaikina OY. Thermal Stability and Kinetics of Decomposition of Hydrogen Polyoxides H2O3 and H2O4 in Peroxy Radical Condensates. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2022. [DOI: 10.1134/s0036024422060140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Preparation of Visible-Light Active Oxygen-Rich TiO2 Coatings Using Low Pressure Cold Spraying. COATINGS 2022. [DOI: 10.3390/coatings12040475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Visible-light active photocatalysts in the form of coatings that can be produced using large-scale methods have attracted considerable attention. Here we show a facile approach to deposit coatings using the low pressure cold spray (LPCS) from oxygen-rich amorphous titanium dioxide, which is a structurally-unconventional feedstock powder for LPCS. We synthesized amorphous TiO2, in which we introduced numerous defects, such as oxide groups (peroxy and superoxy) in volume and hydroxyl groups on the surface. Then we deposited as-prepared powder preserving the presence of active groups, which we demonstrated using Raman spectroscopy. To show the activity of the prepared coatings, we perform methylene blue degradation under visible light. Our research shows that it is worth considering the internal atomic structure and surface chemistry of the powders to be preserved after low pressure cold spraying.
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Wang S, Xu L, Wang J. Iron-Based Dual Active Site-Mediated Peroxymonosulfate Activation for the Degradation of Emerging Organic Pollutants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:15412-15422. [PMID: 34697942 DOI: 10.1021/acs.est.1c06205] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
It is still a challenge to synthesize highly efficient and stable catalysts for the Fenton-like reaction. In this study, we constructed an integrated catalyst with highly dispersed iron-based dual active sites, in which Fe2N and single-atom Fe (SA-Fe) were embedded into nitrogen- and oxygen-co-doped graphitic carbon (Fe-N-O-GC-350). Extended X-ray absorption fine structure (EXAFS) confirmed the coordination structure of iron, and line combination fitting (LCF) demonstrated the coexistence of Fe2N and SA-Fe with percentages of 75 and 25%, respectively. Iron-based dual active sites endowed Fe-N-O-GC-350 with superior catalytic activity to activate peroxymonosulfate (PMS) as evidenced by the fast degradation rate of sulfamethoxazole (SMX) (0.24 min-1) in the presence of 0.4 mM PMS and 0.1 g/L Fe-N-O-GC-350. Unlike the reported singlet oxygen and high-valent iron oxo-mediated degradation induced by the SA-Fe catalyst, both surface-bound reactive species and singlet oxygen contributed to SMX degradation, while surface-bound reactive species dominated. Density functional theory (DFT) simulation indicated that Fe2N and SA-Fe enhanced the adsorption of PMS, which played a key role in PMS activation. The Fe-N-O-GC-350/PMS system had resistance to the interference of common inorganic anions and high oxidation capacity to recalcitrant organic contaminants. This study elucidated the important role of Fe2N in PMS activation and provide a clue to design rationally catalysts with iron-based dual active sites to activate PMS for the degradation of emerging organic pollutants.
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Affiliation(s)
- Shizong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, P. R. China
- Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, P. R. China
| | - Lejin Xu
- Department of Nuclear Engineering and Technology, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, P. R. China
- Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, P. R. China
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Cao C, Vernon RE, Schwarz WHE, Li J. Understanding Periodic and Non-periodic Chemistry in Periodic Tables. Front Chem 2021; 8:813. [PMID: 33490030 PMCID: PMC7818537 DOI: 10.3389/fchem.2020.00813] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Accepted: 08/03/2020] [Indexed: 12/15/2022] Open
Abstract
The chemical elements are the "conserved principles" or "kernels" of chemistry that are retained when substances are altered. Comprehensive overviews of the chemistry of the elements and their compounds are needed in chemical science. To this end, a graphical display of the chemical properties of the elements, in the form of a Periodic Table, is the helpful tool. Such tables have been designed with the aim of either classifying real chemical substances or emphasizing formal and aesthetic concepts. Simplified, artistic, or economic tables are relevant to educational and cultural fields, while practicing chemists profit more from "chemical tables of chemical elements." Such tables should incorporate four aspects: (i) typical valence electron configurations of bonded atoms in chemical compounds (instead of the common but chemically atypical ground states of free atoms in physical vacuum); (ii) at least three basic chemical properties (valence number, size, and energy of the valence shells), their joint variation across the elements showing principal and secondary periodicity; (iii) elements in which the (sp)8, (d)10, and (f)14 valence shells become closed and inert under ambient chemical conditions, thereby determining the "fix-points" of chemical periodicity; (iv) peculiar elements at the top and at the bottom of the Periodic Table. While it is essential that Periodic Tables display important trends in element chemistry we need to keep our eyes open for unexpected chemical behavior in ambient, near ambient, or unusual conditions. The combination of experimental data and theoretical insight supports a more nuanced understanding of complex periodic trends and non-periodic phenomena.
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Affiliation(s)
- Changsu Cao
- Department of Chemistry, Tsinghua University, Beijing, China
| | | | - W. H. Eugen Schwarz
- Department of Chemistry, Tsinghua University, Beijing, China
- Department of Chemistry, University of Siegen, Siegen, Germany
| | - Jun Li
- Department of Chemistry, Tsinghua University, Beijing, China
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, China
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Feng B, Shu Y, Zhang S. Theoretical study of PhCH2O4CH2Ph: intermediate in the PhCH2O2 self-reaction. Struct Chem 2020. [DOI: 10.1007/s11224-019-01383-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gorbachevskii M, Kopitsyn DS, Kotelev MS, Ivanov EV, Vinokurov VA, Novikov AA. Amplification of surface-enhanced Raman scattering by the oxidation of capping agents on gold nanoparticles. RSC Adv 2018; 8:19051-19057. [PMID: 35539670 PMCID: PMC9080636 DOI: 10.1039/c8ra00417j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Accepted: 05/07/2018] [Indexed: 11/21/2022] Open
Abstract
Surface-enhanced Raman spectroscopy is a powerful analytical method, and is especially useful for the detection of nitrogen- and sulfur-containing organic substances in trace amounts. SERS substrates with high enhancement factors can be produced via the aggregation of gold nanoparticles, leading to the formation of ‘hot spots’ – regions of highest electric field intensity and Raman scattering enhancement. Thus, the availability of gold surfaces in ‘hot spots’ for the adsorption of analyte molecules strongly influences the enhancement factor of a substrate. We studied the kinetics of oxidation of dyes with hydrogen peroxide in the presence of citrate-capped gold nanoparticles and discovered the amplification of surface-enhanced Raman scattering, probably due to the oxidation of citrate ligands and the additional adsorption of dye molecules onto vacant spots on the gold surface. Maximum amplification was observed with 3% (v/v) hydrogen peroxide in the reaction medium. Under optimized conditions, model analytes can be detected at concentrations as low as 1 × 10−9 M, which is ten times lower than the detection limit without hydrogen peroxide addition. The intensity of a surface-enhanced Raman scattering signal can be amplified by the peroxide-induced oxidation of citrate capping agents on gold nanoparticles.![]()
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Borden WT, Hoffmann R, Stuyver T, Chen B. Dioxygen: What Makes This Triplet Diradical Kinetically Persistent? J Am Chem Soc 2017; 139:9010-9018. [PMID: 28613073 DOI: 10.1021/jacs.7b04232] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Experimental heats of formation and enthalpies obtained from G4 calculations both find that the resonance stabilization of the two unpaired electrons in triplet O2, relative to the unpaired electrons in two hydroxyl radicals, amounts to 100 kcal/mol. The origin of this huge stabilization energy is described within the contexts of both molecular orbital (MO) and valence-bond (VB) theory. Although O2 is a triplet diradical, the thermodynamic unfavorability of both its hydrogen atom abstraction and oligomerization reactions can be attributed to its very large resonance stabilization energy. The unreactivity of O2 toward both these modes of self-destruction maintains its abundance in the ecosphere and thus its availability to support aerobic life. However, despite the resonance stabilization of the π system of triplet O2, the weakness of the O-O σ bond makes reactions of O2, which eventually lead to cleavage of this bond, very favorable thermodynamically.
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Affiliation(s)
- Weston Thatcher Borden
- Department of Chemistry and the Center for Advanced Scientific Computing and Modeling, University of North Texas , 1155 Union Circle, #305070, Denton, Texas 76203-5017, United States
| | - Roald Hoffmann
- Department of Chemistry and Chemical Biology, Cornell University , Baker Laboratory, Ithaca, New York 14853-1301, United States
| | - Thijs Stuyver
- Algemene Chemie, Vrije Universiteit Brussel , Pleinlaan 2, 1050 Brussels, Belgium.,Research Foundation-Flanders (FWO-Vlaanderen) , Egmontstraat 5, 1000 Brussels, Belgium
| | - Bo Chen
- Department of Chemistry and Chemical Biology, Cornell University , Baker Laboratory, Ithaca, New York 14853-1301, United States
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Levanov AV, Isaikina OY, Lunin VV. Enthalpies of the formation and decomposition of hydrogen trioxide HOOOH in an aqueous solution. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2016. [DOI: 10.1134/s0036024416110145] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Structure of hydrogen tetroxide in gas phase and in aqueous environments: relationship to the hydroperoxyl radical self-reaction. Struct Chem 2015. [DOI: 10.1007/s11224-015-0717-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Levanov AV, Isaykina OY, Amirova NK, Antipenko EE, Lunin VV. Photochemical oxidation of chloride ion by ozone in acid aqueous solution. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:16554-16569. [PMID: 26077317 DOI: 10.1007/s11356-015-4832-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 06/02/2015] [Indexed: 06/04/2023]
Abstract
The experimental investigation of chloride ion oxidation under the action of ozone and ultraviolet radiation with wavelength 254 nm in the bulk of acid aqueous solution at pH 0-2 has been performed. Processes of chloride oxidation in these conditions are the same as the chemical reactions in the system O3 - OH - Cl(-)(aq). Despite its importance in the environment and for ozone-based water treatment, this reaction system has not been previously investigated in the bulk solution. The end products are chlorate ion ClO3(-) and molecular chlorine Cl2. The ions of trivalent iron have been shown to be catalysts of Cl(-) oxidation. The dependencies of the products formation rates on the concentrations of O3 and H(+) have been studied. The chemical mechanism of Cl(-) oxidation and Cl2 emission and ClO3(-) formation has been proposed. According to the mechanism, the dominant primary process of chloride oxidation represents the complex interaction with hydroxyl radical OH with the formation of Cl2(-) anion-radical intermediate. OH radical is generated on ozone photolysis in aqueous solution. The key subsequent processes are the reactions Cl2(-) + O3 → ClO + O2 + Cl(-) and ClO + H2O2 → HOCl + HO2. Until the present time, they have not been taken into consideration on mechanistic description and modelling of Cl(-) oxidation. The final products are formed via the reactions 2ClO → Cl2O2, Cl2O2 + H2O → 2H(+) + Cl(-) + ClO3(-) and HOCl + H(+) + Cl(-) ⇄ H2O + Cl2. Some portion of chloride is oxidized directly by O3 molecule with the formation of molecular chlorine in the end.
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Affiliation(s)
- Alexander V Levanov
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskiye Gory 1, building 3, 119991, Moscow, Russia.
| | - Oksana Ya Isaykina
- A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prospect 29, 119991, Moscow, Russia
| | - Nazrin K Amirova
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskiye Gory 1, building 3, 119991, Moscow, Russia
| | - Ewald E Antipenko
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskiye Gory 1, building 3, 119991, Moscow, Russia
| | - Valerii V Lunin
- Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskiye Gory 1, building 3, 119991, Moscow, Russia
- A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky prospect 29, 119991, Moscow, Russia
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Strle G, Cerkovnik J. A Simple and Efficient Preparation of High-Purity Hydrogen Trioxide (HOOOH). Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Strle G, Cerkovnik J. A Simple and Efficient Preparation of High‐Purity Hydrogen Trioxide (HOOOH). Angew Chem Int Ed Engl 2015; 54:9917-20. [DOI: 10.1002/anie.201504084] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Gregor Strle
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, P.O. Box 537, 1000 Ljubljana (Slovenia)
| | - Janez Cerkovnik
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, P.O. Box 537, 1000 Ljubljana (Slovenia)
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Sprague MK, Irikura KK. Thermochemistry of HO2 + HO2 → H2O4: Does HO2 Dimerization Affect Laboratory Studies? J Phys Chem A 2015; 119:7052-62. [DOI: 10.1021/acs.jpca.5b04265] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Matthew K. Sprague
- Chemical
Sciences Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8320, United States
| | - Karl K. Irikura
- Chemical
Sciences Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8320, United States
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Hydrogen polyoxides H2O3 and H2O4 as components of peroxy radical condensate obtained from electro-dissociated water vapor. Chem Phys 2015. [DOI: 10.1016/j.chemphys.2014.11.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Levanov AV, Isaikina OY, Antipenko EE, Lunin VV. Mechanism of the formation of hydrogen tetroxide and peroxide via low-temperature interaction between hydrogen atoms and molecular oxygen. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2014. [DOI: 10.1134/s0036024414090222] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Denis PA, Huelmo CP. New trends along hydrogen polyoxides: unusually long oxygen–oxygen bonds in H2O6and H2O7. Mol Phys 2014. [DOI: 10.1080/00268976.2014.928385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Levanov AV, Isaykina OY, Antipenko EE, Lunin VV. Formation of hydrogen polyoxides as constituents of peroxy radical condensate upon low-temperature interaction of hydrogen atoms with liquid ozone. J Phys Chem A 2014; 118:62-9. [PMID: 24325583 DOI: 10.1021/jp410938b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The composition of low-temperature condensates obtained by the reaction of hydrogen atoms with liquid ozone has been determined from the Raman spectra and data on the molar ratio of O2 to H2O2 in the decomposition products. The main constituents are hydrogen tetroxide H2O4, trioxide H2O3, and peroxide H2O2 in comparable amounts and also water H2O. The mechanism and quantitative kinetic model of their formation have been proposed. H2O4, H2O3, and H2O2 are formed in the diffusion-controlled reactions between OH and HO2 in the liquid ozone layer and stabilized by transfer to the solid phase. OH and HO2 radicals are generated via a sequence of the reactions initiated by the interaction H + O3(liq). The model adequately reproduces the properties of the real condensates.
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Affiliation(s)
- Alexander V Levanov
- Department of Chemistry, M.V. Lomonosov Moscow State University , Leninskiye Gory 1, building 3, 119991 Moscow, Russia
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Cerkovnik J, Plesničar B. Recent advances in the chemistry of hydrogen trioxide (HOOOH). Chem Rev 2013; 113:7930-51. [PMID: 23808683 DOI: 10.1021/cr300512s] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Janez Cerkovnik
- Department of Chemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana , 1000 Ljubljana, Slovenia
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Stabilization of metastable hydrogen trioxide (HOOOH) and the hydrotrioxyl radical (HOOO) by complexation with sulfuric acid. A theoretical study. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.01.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Hollman DS, Schaefer HF. In search of the next Holy Grail of polyoxide chemistry: Explicitly correlated ab initio full quartic force fields for HOOH, HOOOH, HOOOOH, and their isotopologues. J Chem Phys 2012; 136:084302. [DOI: 10.1063/1.3684231] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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