1
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Li B, Qu R, Wang T, Guo R, Tian J, Li S, Abukhadra MR, Mahmoud RK, Wang Z. Experimental insights and modeling innovations: Deciphering Fe(VI) oxidation in imidazole ionic liquids through QSAR and RFR. JOURNAL OF HAZARDOUS MATERIALS 2024; 476:134980. [PMID: 38905978 DOI: 10.1016/j.jhazmat.2024.134980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 06/09/2024] [Accepted: 06/18/2024] [Indexed: 06/23/2024]
Abstract
In this investigation, we conducted a detailed analysis of the oxidation of 16 imidazole ionic liquid variants by Fe(VI) under uniform experimental setups, thereby securing a dataset of second-order reaction rate constants (kobs). This methodology ensures superior data consistency and comparability over traditional methods that amalgamate disparate data from varied studies. Utilizing 16 chemical structural parameters obtained via Density Functional Theory (DFT) as descriptors, we developed a Quantitative Structure Activity Relationship (QSAR) model. Through rigorous correlation analysis, Principal Component Analysis (PCA), Multiple Linear Regression (MLR), and Applicability Domain (AD) evaluation, we identified a pronounced negative correlation between the molecular orbital gap energy (Egap) and kobs. MLR analysis further underscored Egap as a pivotal predictive variable, with its lower values indicating heightened oxidative reactivity towards Fe(VI) in the ionic liquids, leading the QSAR model to achieve a predictive accuracy of 0.95. Furthermore, we integrated an advanced machine learning approach - Random Forest Regression (RFR), which adeptly highlighted the critical factors influencing the oxidation efficiency of imidazole ionic liquids by Fe(VI) through elaborate decision trees, feature importance assessment, Recursive Feature Elimination (RFE), and cross-validation strategies. The RFR model demonstrated a remarkable predictive performance of 0.98. Both QSAR and RFR models pinpointed Egap as a key descriptor significantly affecting oxidation efficiency, with the RFR model presenting lower root mean square errors, establishing it as a more reliable predictive tool. The application of the RFR model in this study significantly improved the model's stability and the intuitive display of key influencing factors, introducing promising advanced analytical tools to the field of environmental chemistry.
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Affiliation(s)
- Beibei Li
- College of Environmental Sciences and Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, PR China; State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Ruijuan Qu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Ting Wang
- College of Environmental Sciences and Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, PR China
| | - Ruixue Guo
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Jie Tian
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | - Shuyi Li
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China
| | | | | | - Zunyao Wang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Jiangsu Nanjing 210023, PR China.
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2
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Enami S, Numadate N, Hama T. Atmospheric Intermediates at the Air-Water Interface. J Phys Chem A 2024; 128:5419-5434. [PMID: 38968003 PMCID: PMC11264275 DOI: 10.1021/acs.jpca.4c02889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Revised: 06/10/2024] [Accepted: 06/14/2024] [Indexed: 07/07/2024]
Abstract
The air-water interface (AWI) is a ubiquitous reaction field different from the bulk phase where unexpected reactions and physical processes often occur. The AWI is a region where air contacts cloud droplets, aerosol particles, the ocean surface, and biological surfaces such as fluids that line human epithelia. In Earth's atmosphere, short-lived intermediates are expected to be generated at the AWI during multiphase reactions. Recent experimental developments have enabled the direct detection of atmospherically relevant, short-lived intermediates at the AWI. For example, spray ionization mass spectrometric analysis of water microjets exposed to a gaseous mixture of ozone and water vapor combined with a 266 nm laser flash photolysis system (LFP-SIMS) has been used to directly probe organic peroxyl radicals (RO2·) produced by interfacial hydroxyl radicals (OH·) + organic compound reactions. OH· emitted immediately after the laser flash photolysis of carboxylic acid at the gas-liquid interface have been directly detected by time-resolved, laser-induced florescence techniques that can be used to study atmospheric multiphase photoreactions. In this Featured Article, we show some recent experimental advances in the detection of atmospherically important intermediates at the AWI and the associated reaction mechanisms. We also discuss current challenges and future prospects for atmospheric multiphase chemistry.
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Affiliation(s)
- Shinichi Enami
- Department
of Chemistry, Graduate School of Science and Technology, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Naoki Numadate
- Department
of Chemistry, Graduate School of Science and Technology, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Tetsuya Hama
- Komaba
Institute for Science and Department of Basic Science, The University of Tokyo, Meguro, Tokyo 153-8902, Japan
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3
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Broterson YB, Núñez-de la Rosa Y, Guillermo Cuadrado Durango L, Rossi Forim M, Hammer P, Aquino JM. CoFe 2O 4 as a source of Co(II) ions for imidacloprid insecticide oxidation using peroxymonosulfate: Influence of process parameters and surface changes. CHEMOSPHERE 2024; 352:141278. [PMID: 38266880 DOI: 10.1016/j.chemosphere.2024.141278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 01/13/2024] [Accepted: 01/20/2024] [Indexed: 01/26/2024]
Abstract
Nanometric cobalt magnetic ferrite (CoFe2O4) synthesized by distinct methods was used for in situ chemical activation of peroxymonosulfate (PMS) under neutral conditions to oxidize imidacloprid (IMD) insecticide. The effect of CoFe2O4 load (0.125-1.0 g L-1) and PMS concentration (250-1000 μM) was investigated as well as the influence of phosphate buffer and Co(II) ions. PMS activation by Co(II) ions, including those leached from CoFe2O4 (>50 μg L-1), exhibited a strong influence on IMD oxidation and, apparently, without substantial contributions from the solid phase. Within the prepared solid materials (i.e., using sol-gel and co-precipitation methods), high oxidation rates (ca. 0.5 min-1) of IMD were attained in ultrapure water. Phosphate buffer had no significant influence on the IMD oxidation rate and level, however, its use and solution pH have shown to be important parameters, since higher PMS consumption was observed in the presence of buffered solutions at pH 7. IMD byproducts resulting from hydroxylation reactions and rupture of the imidazolidine ring were detected by mass spectrometry. At optimum conditions (0.125 g L-1 of CoFe2O4 and 500 μM of PMS), the CoFe2O4 nanoparticles exhibited an increase in the charge transfer resistance and an enhancement in the surface hydroxylation after PMS activation, which led to radical (HO● and SO4●-) and nonradical (1O2) species. The latter specie led to high levels of IMD oxidation, even in a complex water matrix, such as simulated municipal wastewater at the expense of one-order decrease in the IMD oxidation rate.
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Affiliation(s)
- Yoisel B Broterson
- Federal University of São Carlos (UFSCar), Department of Chemistry, 13565-905, São Carlos, SP, Brazil
| | - Yeison Núñez-de la Rosa
- Federal University of São Carlos (UFSCar), Department of Chemistry, 13565-905, São Carlos, SP, Brazil
| | | | - Moacir Rossi Forim
- Federal University of São Carlos (UFSCar), Department of Chemistry, 13565-905, São Carlos, SP, Brazil
| | - Peter Hammer
- São Paulo State University (UNESP), Institute of Chemistry, Department of Physical Chemistry, 14800-900, Araraquara, SP, Brazil
| | - José M Aquino
- Federal University of São Carlos (UFSCar), Department of Chemistry, 13565-905, São Carlos, SP, Brazil.
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4
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Korotenko V, Zipse H. The stability of oxygen-centered radicals and its response to hydrogen bonding interactions. J Comput Chem 2024; 45:101-114. [PMID: 37747356 DOI: 10.1002/jcc.27221] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 08/10/2023] [Accepted: 08/11/2023] [Indexed: 09/26/2023]
Abstract
The stability of various alkoxy/aryloxy/peroxy radicals, as well as TEMPO and triplet dioxygen (3 O2 ) has been explored at a variety of theoretical levels. Good correlations between RSEtheor and RSEexp are found for hybrid DFT methods, for compound schemes such as G3B3-D3, and also for DLPNO-CCSD(T) calculations. The effects of hydrogen bonding interactions on the stability of oxygen-centered radicals have been probed by addition of a single solvating water molecule. While this water molecule always acts as a H-bond donor to the oxygen-centered radical itself, it can act as a H-bond donor or acceptor to the respective closed-shell parent.
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Affiliation(s)
| | - Hendrik Zipse
- Department of Chemistry, LMU Munich, Munich, Germany
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5
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Liu S, Edara PC, Schäfer AI. Influence of organic matter on the photocatalytic degradation of steroid hormones by TiO 2-coated polyethersulfone microfiltration membrane. WATER RESEARCH 2023; 245:120438. [PMID: 37716301 DOI: 10.1016/j.watres.2023.120438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 07/28/2023] [Accepted: 07/31/2023] [Indexed: 09/18/2023]
Abstract
Water treatment in photocatalytic membrane reactors (PMR) holds great promise for removing micropollutants from aquatic environments. Organic matter (OM) that is present in any water matrix may significantly interfere with the degradation of steroid hormone (SH) micropollutants in PMRs. In this study, the interference of various OM types, humic acid (HA), Australian natural organic matter (AUS), worm farm extract (WF), tannic acid (TA), and gallic acid (GA) with the SH degradation at its environmentally relevant concentration (100 ng/L) in a flow-through PMR equipped with a polyethersulphone-titanium dioxide (PES-TiO2) membrane operated under UV light (365 nm) was investigated. Results of this study showed that OM effects are complex and depend on OM type and concentration. The removal of β-estradiol (E2) was enhanced by HA at its levels below 5 mgC/L while the enhancement was abated at higher HA concentrations. The E2 removal was inhibited by TA, and GA, while no significant interference observed for AUS, and WF. The data demonstrated diverse roles of OM that acts in PMRs as a light screening agent, a photoreactive species scavenger, an adsorption alteration trigger, and a photosensitizer. The time-resolved fluorescence measurement showed that HA, acting as a photosensitizer, promoted the sensitization of TiO2 by absorbing light energy and transferring energy/electron to the TiO2 substrate. This pathway dominated the mechanism of the enhanced E2 degradation by HA. The favorable effect of HA was augmented as increasing the light intensity from 0.5 to 10 mW/cm2 and was weakened at higher light intensities due to the increased scavenging reactions and the limited amount of HA. This work clarifies the underlying mechanism of the OM interference on photocatalytic degradation of E2 by the PES-TiO2 PMR.
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Affiliation(s)
- Siqi Liu
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Pattabhiramayya C Edara
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Andrea I Schäfer
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
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6
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Zhou R, Liu J, Zhou C, Zhang X. Phototransformation of Lignin-related Compounds in Chromophoric Dissolved Organic Matter Solutions. WATER RESEARCH 2023; 245:120586. [PMID: 37717330 DOI: 10.1016/j.watres.2023.120586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 08/25/2023] [Accepted: 09/04/2023] [Indexed: 09/19/2023]
Abstract
Lignin is a major terrestrial source of chromophoric dissolved organic matter (CDOM), and studying the phototransformation of lignin monomers and their related compounds can enhance our understanding of CDOM intramolecular interactions. Coniferyl aldehyde (Coni) and sinapaldehyde (Sina) form ground-state complexes with CDOM, with equilibrium constants of 7,800 (± 1,800) and 20,000 (± 2,000) M-1, respectively. In comparison, vanillin (Van) exhibits minimal affinity for CDOM complexation. The bimolecular reaction rate constants between singlet oxygen (1O2) and these phenolic carbonyl compounds ranged from 0.46 (± 0.02) to 1.8 (± 0.1) × 107 M-1s-1, which is approximately one order of magnitude lower than their reaction rate constants (0.51 (± 0.02)-1.25 (± 0.02) × 108 M-1s-1) with the triplet excited state of CDOM (3CDOM*). In acidic CDOM solutions (pH 5.0), 1O2, H2O2, and organic peroxyl radicals had negligible impact on the transformation. Comparing the initial transformation rate in the presence and in the absence of NaN3 or furfuryl alcohol led to an overestimation of the contribution of 1O2 to the transformation of Van, Coni, or Sina. 3CDOM* scavengers could not fully inhibit the transformation of Coni or Sina. The remaining transformation is considered to arise from either the unquenched intra-CDOM phase 3CDOM* or a fraction of Coni⊂CDOM or Sina⊂CDOM complex, which underwent intramolecular photoinduced chemical reactions.
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Affiliation(s)
- Ruiya Zhou
- School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, P.R. China
| | - Juan Liu
- School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, P.R. China
| | - Chi Zhou
- Hubei Water Resources Research Institute, Wuhan, 430070, P.R. China.
| | - Xu Zhang
- School of Resources and Environmental Science, Wuhan University, Wuhan, 430079, P.R. China.
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7
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Chu C, Yan Y, Ma J, Jin S, Spinney R, Dionysiou DD, Zhang H, Xiao R. Implementation of laser flash photolysis for radical-induced reactions and environmental implications. WATER RESEARCH 2023; 244:120526. [PMID: 37672949 DOI: 10.1016/j.watres.2023.120526] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/06/2023] [Accepted: 08/24/2023] [Indexed: 09/08/2023]
Abstract
Confronted with the imperative crisis of water quality deterioration, the pursuit of state-of-the-art decontamination technologies for a sustainable future never stops. Fitting into the framework of suitability, advanced oxidation processes have been demonstrated as powerful technologies to produce highly reactive radicals for the degradation of toxic and refractory contaminants. Therefore, investigations on their radical-induced degradation have been the subject of scientistic and engineering interests for decades. To better understand the transient nature of these radical species and rapid degradation processes, laser flash photolysis (LFP) has been considered as a viable and powerful technique due to its high temporal resolution and rapid response. Although a number of studies exploited LFP for one (or one class of) specific reaction(s), reactions of many possible contaminants with radicals are largely unknown. Therefore, there is a pressing need to critically review its implementation for kinetic quantification and mechanism elucidation. Within this context, we introduce the development process and milestones of LFP with emphasis on compositions and operation principles. We then compare the specificity and suitability of different spectral modes for monitoring radicals and their decay kinetics. Radicals with high environmental relevance, namely hydroxyl radical, sulfate radical, and reactive chlorine species, are selected, and we discuss their generation, detection, and implications within the frame of LFP. Finally, we highlight remaining challenges and future perspectives. This review aims to advance our understandings of the implementation of LFP in radical-induced transient processes, and yield new insights for extrapolating this pump-probe technique to make significant strides in environmental implications.
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Affiliation(s)
- Chu Chu
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Yiqi Yan
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Junye Ma
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Shengye Jin
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Richard Spinney
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio, 45221, USA
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, Ohio, 45221, USA; Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Haijun Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Ruiyang Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China.
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8
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Li X, Bai Y, Shi X, Chang S, Tian S, He M, Su N, Luo P, Pu W, Pan Z. A review of advanced oxidation process towards organic pollutants and its potential application in fracturing flowback fluid. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:45643-45676. [PMID: 36823463 DOI: 10.1007/s11356-023-25191-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 01/03/2023] [Indexed: 04/15/2023]
Abstract
Fracturing flowback fluid (FFF) including various kinds of organic pollutants that do harms to people and new treatments are urgently needed. Advanced oxidation processes (AOPs) are suitable methods in consideration with molecular weight, removal cost and efficiency. Here, we summarize the recent studies about AOP treatments towards organic pollutants and discuss the application prospects in treatment of FFF. Immobilization and loading methods of catalysts, evaluation method of degradation of FFF, and continuous treatment process flow are discussed in this review. In conclusion, further studies are urgently needed in aspects of catalyst loading methods, macromolecule organic evaluation methods, industrial process, and pathways of macromolecule organics' decomposition.
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Affiliation(s)
- Xing Li
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu, 610500, China
| | - Yang Bai
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu, 610500, China
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China
| | - Xian Shi
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Shuang Chang
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China
| | - Shuting Tian
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China
| | - Meiming He
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu, 610500, China
| | - Na Su
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu, 610500, China
| | - Pingya Luo
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu, 610500, China
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China
| | - Wanfen Pu
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu, 610500, China.
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, China.
| | - Zhicheng Pan
- National Postdoctoral Research Station, Haitian Water Group Co., Ltd, Chengdu, 610041, China
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9
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γ–radiolytic degradation of rosuvastatin in the air–saturated aqueous solution. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2023.110885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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10
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Galeotti M, Salamone M, Bietti M. Electronic control over site-selectivity in hydrogen atom transfer (HAT) based C(sp 3)-H functionalization promoted by electrophilic reagents. Chem Soc Rev 2022; 51:2171-2223. [PMID: 35229835 DOI: 10.1039/d1cs00556a] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The direct functionalization of C(sp3)-H bonds represents one of the most investigated approaches to develop new synthetic methodology. Among the available strategies for intermolecular C-H bond functionalization, increasing attention has been devoted to hydrogen atom transfer (HAT) based procedures promoted by radical or radical-like reagents, that offer the opportunity to introduce a large variety of atoms and groups in place of hydrogen under mild conditions. Because of the large number of aliphatic C-H bonds displayed by organic molecules, in these processes control over site-selectivity represents a crucial issue, and the associated factors have been discussed. In this review article, attention will be devoted to the role of electronic effects on C(sp3)-H bond functionalization site-selectivity. Through an analysis of the recent literature, a detailed description of the HAT reagents employed in these processes, the associated mechanistic features and the selectivity patterns observed in the functionalization of substrates of increasing structural complexity will be provided.
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Affiliation(s)
- Marco Galeotti
- Dipartimento di Scienze e Tecnologie Chimiche, Università "Tor Vergata", Via della Ricerca Scientifica, 1 I-00133 Rome, Italy.
| | - Michela Salamone
- Dipartimento di Scienze e Tecnologie Chimiche, Università "Tor Vergata", Via della Ricerca Scientifica, 1 I-00133 Rome, Italy.
| | - Massimo Bietti
- Dipartimento di Scienze e Tecnologie Chimiche, Università "Tor Vergata", Via della Ricerca Scientifica, 1 I-00133 Rome, Italy.
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11
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Cao Z, Yu X, Zheng Y, Aghdam E, Sun B, Song M, Wang A, Han J, Zhang J. Micropollutant abatement by the UV/chloramine process in potable water reuse: A review. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127341. [PMID: 34634702 DOI: 10.1016/j.jhazmat.2021.127341] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 09/20/2021] [Accepted: 09/22/2021] [Indexed: 06/13/2023]
Abstract
The need in using reclaimed water increased significantly to address the water shortage and its continuing quality deterioration in sustaining societal development. Degrading micropollutants in wastewater treatment plant effluents is one of the most important tasks in supplying safe drinking water, which is often achieved by full advanced treatment technologies (FATs), including reverse osmosis (RO) and the UV-based advanced oxidation process (AOP). As an emerging AOP, UV/chloramine process shows many noteworthy advantages in the scenario of potable water reuse, including membrane biological fouling control by chloramine, producing highly reactive radicals (e.g., Cl•, HO•, Cl2•-, and reactive nitrogen-containing species) to degrade the RO permeated pollutants, and acting as long-lasting disinfectant in the potable water distribution system. In addition, chloramine is often designedly produced by taking advantage of the ammonia in source. Thus, UV/chloramine processes gather much attention from researcher and published papers on UV/chloramine process have drastically increased since 2016, which were thoroughly reviewed in this paper. The fundamentals of chloramine photolysis, including the photolysis kinetics, the quantum yield, the generation and transformation of radicals and the final products, were scrutinized. Further, the impacts of reaction conditions such as pH, chloramine dosage and water matrix on the degradation of micropollutants by the UV/chloramine process are discussed. Moreover, the formation potential of disinfection by-products is debated. The opportunity of application of the UV/chloramine process in real-world practice is also presented, emphasizing the need for extensive efforts to remove currently prevalent knowledge roadblocks.
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Affiliation(s)
- Zhenfeng Cao
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, Shandong 266237, PR China
| | - Ximing Yu
- Taiwei Energy Group Co., Ltd., Jinan, Shandong 250001, PR China
| | - Yuzhen Zheng
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, Shandong 266237, PR China
| | - Ehsan Aghdam
- Department of Civil and Environmental Engineering, the Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Bo Sun
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, Shandong 266237, PR China; Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
| | - Mingming Song
- School of Environmental Science & Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong 250353, PR China
| | - Aijie Wang
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China
| | - Jinglong Han
- School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China
| | - Jian Zhang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao, Shandong 266237, PR China.
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12
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Zhou Y, Cao Q, Yang Y, Ma D, Zhu Q, Ma J. Effect of (H 2O) n ( n = 0–3, 13) on the NH 3 + OH reaction in the gas and liquid phases. RSC Adv 2022; 12:28010-28019. [PMID: 36320266 PMCID: PMC9524257 DOI: 10.1039/d2ra04931g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Accepted: 09/20/2022] [Indexed: 11/25/2022] Open
Abstract
We studied the effect of water clusters on the NH3 + OH reaction at both the DFT and CCSD(T) levels. The calculated rate constants for the pure reaction are 2.07 × 10−13 and 1.35 × 10−13 cm3 molecule−1 s−1 in the gas and liquid phases, respectively, and the gas-phase rate constants are consistent with the corresponding experimental result (1.70 × 10−13 cm3 molecule−1 s−1), while the liquid-phase rate constants are slightly smaller than the experimental value (5.84 × 10−12 cm3 molecule−1 s−1). In the gas phase, the presence of (H2O)n (n = 1–3) decreases the rate constant compared to the pure NH3 + OH reaction, and these results are in agreement with many reported H2O-catalyzed reactions. For the liquid phase reaction, compared with the case of n = 0–3, when the size of the water molecule cluster surrounding the OH radical is n = 13, the rate constant of the title reaction increases. Our study also shows that proton transfer is also a factor which accelerates the liquid phase NH3 + OH reaction. We used DFT and CCSD(T) methods with PCM solvation model to study the water cluster effect and solvation effect on the NH3 + OH reaction.![]()
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Affiliation(s)
- Yujie Zhou
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, China
| | - Qi Cao
- Reactor Operation and Application Research Sub-Institute, Nuclear Power Institute of China, Chengdu 610041, China
| | - Yu Yang
- Reactor Operation and Application Research Sub-Institute, Nuclear Power Institute of China, Chengdu 610041, China
| | - Dandan Ma
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, China
| | - Quan Zhu
- School of Chemical Engineering, Sichuan University, Chengdu, 610065, PR China
- Engineering Research Center of Combustion and Cooling for Aerospace Power, Ministry of Education, Sichuan University, Chengdu, 610065, PR China
| | - Jianyi Ma
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, China
- Engineering Research Center of Combustion and Cooling for Aerospace Power, Ministry of Education, Sichuan University, Chengdu, 610065, PR China
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13
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Waggoner AR, Abdulrahman Y, Iverson AJ, Gibson EP, Buckles MA, Poole JS. Reaction of hydroxyl radical with arenes in solution—On the importance of benzylic hydrogen abstraction. J PHYS ORG CHEM 2021. [DOI: 10.1002/poc.4278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
| | - Yahya Abdulrahman
- Department of Chemistry and Biochemistry St. Cloud State University St. Cloud Minnesota USA
| | - Alexis J. Iverson
- Department of Chemistry and Biochemistry St. Cloud State University St. Cloud Minnesota USA
| | - Ethan P. Gibson
- Department of Chemistry Ball State University Muncie Indiana USA
| | - Mark A. Buckles
- Department of Chemistry Ball State University Muncie Indiana USA
| | - James S. Poole
- Department of Chemistry Ball State University Muncie Indiana USA
- Department of Chemistry and Biochemistry St. Cloud State University St. Cloud Minnesota USA
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14
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Zhang P, Yang Y, Duan X, Liu Y, Wang S. Density Functional Theory Calculations for Insight into the Heterocatalyst Reactivity and Mechanism in Persulfate-Based Advanced Oxidation Reactions. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03099] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Panpan Zhang
- School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Yangyang Yang
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Xiaoguang Duan
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Yunjian Liu
- School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Shaobin Wang
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, South Australia 5005, Australia
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15
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Chu X, Qian W, Lu B, Wang L, Qin J, Li J, Rauhut G, Trabelsi T, Francisco JS, Zeng X. The Triplet Hydroxyl Radical Complex of Phosphorus Monoxide. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202011512] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xianxu Chu
- College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China
| | - Weiyu Qian
- College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China
| | - Bo Lu
- College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China
| | - Lina Wang
- Department of Chemistry Fudan University Shanghai 200433 China
| | - Jie Qin
- School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Theoretical and Computational Chemistry Chongqing University Chongqing 401331 China
| | - Jun Li
- School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Theoretical and Computational Chemistry Chongqing University Chongqing 401331 China
| | - Guntram Rauhut
- Institute for Theoretical Chemistry University of Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Tarek Trabelsi
- Department of Earth and Environment Science and Department of Chemistry University of Pennsylvania Philadelphia Pennsylvania 19104-6243 USA
| | - Joseph S. Francisco
- Department of Earth and Environment Science and Department of Chemistry University of Pennsylvania Philadelphia Pennsylvania 19104-6243 USA
| | - Xiaoqing Zeng
- College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China
- Department of Chemistry Fudan University Shanghai 200433 China
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16
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Chu X, Qian W, Lu B, Wang L, Qin J, Li J, Rauhut G, Trabelsi T, Francisco JS, Zeng X. The Triplet Hydroxyl Radical Complex of Phosphorus Monoxide. Angew Chem Int Ed Engl 2020; 59:21949-21953. [PMID: 33073924 DOI: 10.1002/anie.202011512] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Indexed: 01/07/2023]
Abstract
Phosphorus monoxide (. PO) is a key intermediate in phosphorus chemistry, and its association with the hydroxyl radical (. OH) to yield metaphosphorous acid (cis-HOPO) contributes to the chemiluminescence in the combustion of phosphines. When photolyzing cis-HOPO in an Ar-matrix at 2.8 K, the simplest dioxophosphorane HPO2 and an elusive hydroxyl radical complex (HRC) of . PO form. This prototypical radical-radical complex reforms into cis-HOPO at above 12.0 K by overcoming a barrier of 0.28±0.02 kcal mol-1 . The vibrational spectra of this HRC and its D- and 18 O-isotopologues suggest a structure of . OH⋅⋅⋅OP. , for which a triplet spin multiplicity with a binding energy of -3.20 kcal mol-1 has been computed at the UCCSD(T)-F12a/aug-cc-pVTZ level.
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Affiliation(s)
- Xianxu Chu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Weiyu Qian
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Bo Lu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Lina Wang
- Department of Chemistry, Fudan University, Shanghai, 200433, China
| | - Jie Qin
- School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing, 401331, China
| | - Jun Li
- School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing, 401331, China
| | - Guntram Rauhut
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Tarek Trabelsi
- Department of Earth and Environment Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania, 19104-6243, USA
| | - Joseph S Francisco
- Department of Earth and Environment Science and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania, 19104-6243, USA
| | - Xiaoqing Zeng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
- Department of Chemistry, Fudan University, Shanghai, 200433, China
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17
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Lee JW, Lim S, Maienshein DN, Liu P, Ngai MY. Redox-Neutral TEMPO Catalysis: Direct Radical (Hetero)Aryl C-H Di- and Trifluoromethoxylation. Angew Chem Int Ed Engl 2020; 59:21475-21480. [PMID: 32830430 PMCID: PMC7720849 DOI: 10.1002/anie.202009490] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/12/2020] [Indexed: 12/15/2022]
Abstract
Applications of TEMPO. catalysis for the development of redox-neutral transformations are rare. Reported here is the first TEMPO. -catalyzed, redox-neutral C-H di- and trifluoromethoxylation of (hetero)arenes. The reaction exhibits a broad substrate scope, has high functional-group tolerance, and can be employed for the late-stage functionalization of complex druglike molecules. Kinetic measurements, isolation and resubjection of catalytic intermediates, UV/Vis studies, and DFT calculations support the proposed oxidative TEMPO. /TEMPO+ redox catalytic cycle. Mechanistic studies also suggest that Li2 CO3 plays an important role in preventing catalyst deactivation. These findings will provide new insights into the design and development of novel reactions through redox-neutral TEMPO. catalysis.
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Affiliation(s)
- Johnny W Lee
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery, State University of New York, Stony Brook, NY, 11794, USA
| | - Sanghyun Lim
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery, State University of New York, Stony Brook, NY, 11794, USA
| | - Daniel N Maienshein
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Ming-Yu Ngai
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery, State University of New York, Stony Brook, NY, 11794, USA
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18
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Huang Q, Fang C. Degradation of 3,3',4,4'-tetrachlorobiphenyl (PCB77) by dielectric barrier discharge (DBD) non-thermal plasma: Degradation mechanism and toxicity evaluation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 739:139926. [PMID: 32540661 DOI: 10.1016/j.scitotenv.2020.139926] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 06/01/2020] [Accepted: 06/01/2020] [Indexed: 06/11/2023]
Abstract
Polychlorinated biphenyls (PCBs) are a kind of persistent organic pollutants (POPs) with stable chemical properties which can be enriched in a biological body for a long time. They are often carelessly released into natural environment and thus constantly posing a potential threat to human health. However, because of lack of effective ways of degrading PCBs, researchers are still striving to explore new approaches to remove them from the environment. In this work, we employed atmospheric-pressure non-thermal dielectric barrier discharge (DBD) plasma to treat 3,3',4,4'-tetrachlorobiphenyl (PCB77) in aqueous solution and investigated the removal efficiency under different DBD conditions using different discharging gases. As a result, we showed that He-DBD had the highest removal efficiency with hydroxyl radical playing the major role in the degradation, while O2-DBD also gave rise to relatively high efficiency with ozone making an important contribution. After 2 min of treatments by He-DBD and O2-DBD, over 75% of PCB77 was degraded with removal rate of 23.65 mg/L and 22.19 mg/L per minute, respectively. Besides, the toxicological evaluation for the DBD treatment was also provided, confirming that the PCB77 degradation products had negligible biotoxicity. This work therefore provides a new effective approach to treatment of persistent organic pollutants (POPs) in the environment.
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Affiliation(s)
- Qing Huang
- CAS Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China.
| | - Cao Fang
- CAS Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China
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19
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Lee JW, Lim S, Maienshein DN, Liu P, Ngai M. Redox‐Neutral TEMPO Catalysis: Direct Radical (Hetero)Aryl C−H Di‐ and Trifluoromethoxylation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009490] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Johnny W. Lee
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery State University of New York Stony Brook NY 11794 USA
| | - Sanghyun Lim
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery State University of New York Stony Brook NY 11794 USA
| | | | - Peng Liu
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Ming‐Yu Ngai
- Department of Chemistry and Institute of Chemical Biology and Drug Discovery State University of New York Stony Brook NY 11794 USA
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20
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Gao L, Mao Q, Luo S, Cao L, Xie X, Yang Y, Deng Y, Wei Z. Experimental and theoretical insights into kinetics and mechanisms of hydroxyl and sulfate radicals-mediated degradation of sulfamethoxazole: Similarities and differences. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 259:113795. [PMID: 31918128 DOI: 10.1016/j.envpol.2019.113795] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 10/17/2019] [Accepted: 12/10/2019] [Indexed: 06/10/2023]
Abstract
Hydroxyl radical (•OH)- and sulfate radical ()-based advanced oxidation technologies (AOTs) have been proven an effective method to remove antibiotics in wastewater treatment plants (WWTPs). This study aims to gain insights into kinetics and mechanisms of neutral sulfamethoxazole (SMX) degradation, a representative antibiotic, by •OH and using an experimental and theoretical approach. First, the second-order rate constants (k) of SMX with •OH and were determined to be (7.27 ± 0.43) × 109 and (2.98 ± 0.32) × 109 M-1 s-1 in UV/H2O2 and UV/persulfate (UV/PS) systems, respectively. The following theoretical calculations at the M06-2X level of theory revealed that addition of radicals to the benzene ring is the most favorable first-step reaction for both •OH and , but that exhibits higher energy barriers and selectivity than •OH due to steric hindrance. We further analyzed subsequent reactions and, interestingly, our findings closely corroborated HOMO/LUMO distributions of SMX to the oxidation pathways. Finally, the estimation of energy consumption for UV alone, •OH-, and -mediated oxidation processes was compared. These comparative results, for the first time, provide insights into the similarities and differences of degradation of SMX by •OH/ at the molecular level and can help improve antibiotics removal using radical based AOTs in WWTPs.
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Affiliation(s)
- Lingwei Gao
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China; Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China
| | - Qiming Mao
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China
| | - Shuang Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China.
| | - Linying Cao
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China
| | - Xiande Xie
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China
| | - Yuan Yang
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China
| | - Yunfeng Deng
- School of Materials Science and Engineering and Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072, China
| | - Zongsu Wei
- Centre for Water Technology (WATEC), Department of Engineering, Aarhus University, Hangøvej 2, DK-8200, Aarhus N, Denmark.
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21
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Chen C, Lu B, Zhao X, Qian W, Liu J, Trabelsi T, Francisco JS, Qin J, Li J, Wang L, Zeng X. Capture of the Sulfur Monoxide–Hydroxyl Radical Complex. J Am Chem Soc 2020; 142:2175-2179. [DOI: 10.1021/jacs.9b12152] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Changyun Chen
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China
| | - Bo Lu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China
| | - Xiaofang Zhao
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China
| | - Weiyu Qian
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China
| | - Jie Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China
| | - Tarek Trabelsi
- Department of Earth and Environment Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
| | - Joseph S. Francisco
- Department of Earth and Environment Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6243, United States
| | - Jie Qin
- School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, 401331 Chongqing, China
| | - Jun Li
- School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, 401331 Chongqing, China
| | - Lina Wang
- Department of Chemistry, Fudan University, 200433 Shanghai, China
| | - Xiaoqing Zeng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China
- Department of Chemistry, Fudan University, 200433 Shanghai, China
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22
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Mao Q, Zhou Y, Yang Y, Zhang J, Liang L, Wang H, Luo S, Luo L, Jeyakumar P, Ok YS, Rizwan M. Experimental and theoretical aspects of biochar-supported nanoscale zero-valent iron activating H 2O 2 for ciprofloxacin removal from aqueous solution. JOURNAL OF HAZARDOUS MATERIALS 2019; 380:120848. [PMID: 31319334 DOI: 10.1016/j.jhazmat.2019.120848] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 06/23/2019] [Accepted: 06/29/2019] [Indexed: 06/10/2023]
Abstract
Ciprofloxacin has been frequently detected in water environment, and its removal has become a significant public concern. Biochar-supported nanoscale zero-valent iron (BC/nZVI) to activate hydrogen peroxide (H2O2) has many advantages on promoting the removal of organic contaminants. In this paper, the BC/nZVI activating H2O2 degradation of ciprofloxacin was systematically investigated by experimental and theoretical approaches. The morphologies and property analysis showed that nZVI particles distributed uniformly on the biochar surface, which mainly include -OH, >CO and COC and CO groups. Different reaction conditions were compared to define the optimal conditions for ciprofloxacin removal in BC/nZVI/H2O2 system. More than 70% of ciprofloxacin was removed in the optimal conditions: acidic condition (pH 3∼4), low doses of H2O2 (20 mM), and temperature of 298 K. The hydroxyl radical (•OH) oxidation was the primary pathway in BC/nZVI/H2O2 degradation of ciprofloxacin process. The theoretical calculation indicated that hydrogen atom abstraction (HAA) pathways were the dominant oxidation pathways contributing 92.3% in overall second‒order rate constants (k) of •OH and ciprofloxacin. The current results are valuable to evaluate the application of BC/nZVI activating H2O2 degradation of ciprofloxacin and other fluoroquinolone antibiotics in water treatment plants.
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Affiliation(s)
- Qiming Mao
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Yaoyu Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Yuan Yang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Jiachao Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Lifen Liang
- School of Environmental and Chemical Engineering, Foshan University, Foshan, 528000, China
| | - Hailong Wang
- Biochar Engineering Technology Research Center of Guangdong Province, School of Environmental and Chemical Engineering, Foshan University, Foshan, Guangdong 528000, China; Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou, Zhejiang 311300, China
| | - Shuang Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.
| | - Lin Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.
| | - Paramsothy Jeyakumar
- Environmental Sciences, School of Agriculture and Environment, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Yong Sik Ok
- Korea Biochar Research Center, O-Jeong Eco-Resilience Institute (OJERI) & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Muhammad Rizwan
- Department of Environmental Sciences and Engineering, Government College University, Allama Iqbal Road, 38000 Faisalabad, Pakistan
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23
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Moores LC, Kaur D, Smith MD, Poole JS. Regioselectivity of Hydroxyl Radical Reactions with Arenes in Nonaqueous Solutions. J Org Chem 2019; 84:3260-3269. [PMID: 30779577 DOI: 10.1021/acs.joc.8b03188] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The regioselectivity of hydroxyl radical addition to arenes was studied using a novel analytical method capable of trapping radicals formed after the first elementary step of reaction, without alteration of the product distributions by secondary oxidation processes. Product analyses of these reactions indicate a preference for o- over p-substitution for electron donating groups, with both favored over m-addition. The observed distributions are qualitatively similar to those observed for the addition of other carbon-centered radicals, although the magnitude of the regioselectivity observed is greater for hydroxyl. The data, reproduced by high accuracy CBS-QB3 computational methods, indicate that both polar and radical stabilization effects play a role in the observed regioselectivities. The application and potential limitations of the analytical method used are discussed.
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Affiliation(s)
- Lee C Moores
- Department of Chemistry , Ball State University , Muncie , Indiana 47306 , United States
| | - Devinder Kaur
- Department of Chemistry , Ball State University , Muncie , Indiana 47306 , United States
| | - Mathew D Smith
- Department of Chemistry , Ball State University , Muncie , Indiana 47306 , United States
| | - James S Poole
- Department of Chemistry , Ball State University , Muncie , Indiana 47306 , United States
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24
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Rodriguez-Muñiz GM, Miranda MA, Marin ML. A Time-Resolved Study on the Reactivity of Alcoholic Drinks with the Hydroxyl Radical. Molecules 2019; 24:E234. [PMID: 30634584 PMCID: PMC6359750 DOI: 10.3390/molecules24020234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2018] [Revised: 12/28/2018] [Accepted: 01/07/2019] [Indexed: 01/19/2023] Open
Abstract
Reactive oxygen species (ROS) can provoke damage to cells, where their concentrations are regulated by antioxidants. As the hydroxyl radical (•OH) is the most oxidizing ROS, we have focused our attention on the use of a mechanistically based time-resolved methodology, such as laser flash photolysis, to determine the relative reactivity of alcoholic beverages towards •OH as an indicator of their antioxidant potential. The selected drinks were of two different origins: (i) those derived from grapes such as red wine, white wine, white vermouth, marc and brandy and (ii) spirits not derived from grapes: triple sec, gin, whisky, and rum. Initially, we determined the quenching rate constant of ethanol with •OH and then we explored the reactivity of the different beverages, which was higher than expected based on their alcoholic content. This can be attributed to the presence of antioxidants and was especially remarkable for the grape-derived drinks.
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Affiliation(s)
- Gemma M Rodriguez-Muñiz
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, E-46022 Valencia, Spain.
| | - Miguel A Miranda
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, E-46022 Valencia, Spain.
| | - M Luisa Marin
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, E-46022 Valencia, Spain.
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25
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Lei Y, Zhu C, Lu J, Zhu Y, Zhang Q, Chen T, Xiong H. Photochemical oxidation of di-n-butyl phthalate in atmospheric hydrometeors by hydroxyl radicals from nitrous acid. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:31091-31100. [PMID: 30187409 DOI: 10.1007/s11356-018-3091-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 08/27/2018] [Indexed: 06/08/2023]
Abstract
The photochemical oxidation of di-n-butyl phthalate (DBP) by •OH radicals from nitrous acid (HONO) in atmospheric hydrometeors was explored by two techniques, steady-state irradiation, and laser flash photolysis (LFP). The effects of atmospheric liquid parameters on DBP transformation were systematically evaluated, showing that DBP does not react with HONO directly and •OH-initiated reactions are crucial steps for consumption and transformation of DBP. Two reaction channels are operative: •OH addition and hydrogen atom abstraction. The overall rate constant for the reaction of DBP with •OH is 5.7 × 109 M-1 s-1, and its specific rate constant for addition is 3.7 × 109 M-1 s-1 determined by using laser flash photolysis technique. Comparing the individual reaction rate constant for aromatic ring addition with the total rate constant, the majority of the •OH radicals (about 65%) attack the aromatic ring. The major transformation products were identified by GC-MS, and the trends of their yields derived from both ring addition and H-abstraction with time are discussed. These results provide important insights into the photochemical transformation of DBP in atmospheric hydrometeors and contribute to atmospheric aerosol chemistry.
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Affiliation(s)
- Yu Lei
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Chengzhu Zhu
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China.
| | - Jun Lu
- Center of Analysis and Measurement, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Yongchao Zhu
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Qiuyue Zhang
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Tianhu Chen
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Hongbin Xiong
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China.
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26
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Johnson EM, Waggoner AR, Xia S, Luk HL, Hadad CM, Poole JS. Reactivity of Hydroxyl Radical in Nonaqueous Phases: Addition Reactions. J Phys Chem A 2018; 122:8326-8335. [DOI: 10.1021/acs.jpca.8b08463] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Erica M. Johnson
- Department of Chemistry, Ball State University, Muncie, Indiana 47306, United States
| | - Abygail R. Waggoner
- Department of Chemistry, Ball State University, Muncie, Indiana 47306, United States
| | - Shijing Xia
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Hoi Ling Luk
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Christopher M. Hadad
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - James S. Poole
- Department of Chemistry, Ball State University, Muncie, Indiana 47306, United States
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27
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Zhou Y, Liu X, Zhao Y, Luo S, Wang L, Yang Y, Oturan MA, Mu Y. Structure-based synergistic mechanism for the degradation of typical antibiotics in electro-Fenton process using Pd–Fe3O4 model catalyst: Theoretical and experimental study. J Catal 2018. [DOI: 10.1016/j.jcat.2018.07.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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28
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Luo S, Gao L, Wei Z, Spinney R, Dionysiou DD, Hu WP, Chai L, Xiao R. Kinetic and mechanistic aspects of hydroxyl radical‒mediated degradation of naproxen and reaction intermediates. WATER RESEARCH 2018; 137:233-241. [PMID: 29550726 DOI: 10.1016/j.watres.2018.03.002] [Citation(s) in RCA: 102] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Revised: 02/23/2018] [Accepted: 03/02/2018] [Indexed: 05/07/2023]
Abstract
Hydroxyl radical (•OH) based advanced oxidation technologies (AOTs) are effective for removing non‒steroidal anti-inflammatory drugs (NSAIDs) during water treatment. In this study, we systematically investigated the degradation kinetics of naproxen (NAP), a representative NSAID, with a combination of experimental and theoretical approaches. The second-order rate constant (k) of •OH oxidation of NAP was measured to be (4.32 ± 0.04) × 109 M-1 s-1, which was in a reasonable agreement with transition state theory calculated k value (1.08 × 109 M-1 s-1) at SMD/M05-2X/6-311++G**//M05-2X/6-31+G** level of theory. The calculated result revealed that the dominant reaction intermediate is 2‒(5‒hydroxy‒6‒methoxynaphthalen‒2‒yl)propanoic acid (HMNPA) formed via radical adduct formation pathway, in which •OH addition onto the ortho site of the methoxy-substituted benzene ring is the most favorable pathway for the NAP oxidation. We further investigated the subsequent •OH oxidation of HMNPA via a kinetic modelling technique. The k value of the reaction of HMNPA and •OH was determined to be 2.22 × 109 M-1 s-1, exhibiting a similar reactivity to the parent NAP. This is the first study on the kinetic and mechanistic aspects of NAP and its reaction intermediates. The current results are valuable in future study evaluating and extending the application of •OH based AOTs to degrade NAP and other NSAIDs of concern in water treatment plants.
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Affiliation(s)
- Shuang Luo
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Lingwei Gao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Zongsu Wei
- Laboratory for the Chemistry of Construction Materials (LC(2)), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, 90095, USA
| | - Richard Spinney
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, 43210, USA
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering (ChEE), University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Wei-Ping Hu
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia‒Yi, 62102, Taiwan
| | - Liyuan Chai
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Ruiyang Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China.
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29
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Enami S, Hoffmann MR, Colussi AJ. Extensive H-atom abstraction from benzoate by OH-radicals at the air-water interface. Phys Chem Chem Phys 2018; 18:31505-31512. [PMID: 27827491 DOI: 10.1039/c6cp06652f] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Much is known about OH-radical chemistry in the gas-phase and bulk water. Important atmospheric and biological processes, however, involve little investigated OH-radical reactions at aqueous interfaces with hydrophobic media. Here, we report the online mass-specific identification of the products and intermediates generated on the surface of aqueous (H2O, D2O) benzoate-h5 and -d5 microjets by ∼8 ns ˙OH(g) pulses in air at 1 atm. Isotopic labeling lets us unambiguously identify the phenylperoxyl radicals that ensue H-abstraction from the aromatic ring and establish a lower bound (>26%) to this process as it takes place in the interfacial water nanolayers probed by our experiments. The significant extent of H-abstraction vs. its negligible contribution both in the gas-phase and bulk water underscores the unique properties of the air-water interface as a reaction medium. The enhancement of H-atom abstraction in interfacial water is ascribed, in part, to the relative destabilization of a more polar transition state for OH-radical addition vs. H-abstraction due to incomplete hydration at the low water densities prevalent therein.
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Affiliation(s)
- Shinichi Enami
- National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
| | - Michael R Hoffmann
- Linde Center for Global Environmental Science, California Institute of Technology, California 91125, USA.
| | - Agustín J Colussi
- Linde Center for Global Environmental Science, California Institute of Technology, California 91125, USA.
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30
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Fomenko IS, Gushchin AL, Shul’pina LS, Ikonnikov NS, Abramov PA, Romashev NF, Poryvaev AS, Sheveleva AM, Bogomyakov AS, Shmelev NY, Fedin MV, Shul’pin GB, Sokolov MN. New oxidovanadium(iv) complex with a BIAN ligand: synthesis, structure, redox properties and catalytic activity. NEW J CHEM 2018. [DOI: 10.1039/c8nj03358g] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The combination of a new oxidovanadium(iv) complex1with pyrazine-2-carboxylic acid (PCA; a cocatalyst) affords a catalytic system for the efficient oxidation of saturated hydrocarbons.
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Affiliation(s)
- Iakov S. Fomenko
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences
- Novosibirsk 630090
- Russia
| | - Artem L. Gushchin
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences
- Novosibirsk 630090
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
| | - Lidia S. Shul’pina
- Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- Moscow 119991
- Russia
| | - Nikolay S. Ikonnikov
- Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- Moscow 119991
- Russia
| | - Pavel A. Abramov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences
- Novosibirsk 630090
- Russia
| | - Nikolay F. Romashev
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences
- Novosibirsk 630090
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
| | - Artem S. Poryvaev
- Novosibirsk State University
- 630090 Novosibirsk
- Russia
- International Tomography Center, Siberian Branch of Russian Academy of Sciences
- 630090 Novosibirsk
| | - Alena M. Sheveleva
- Novosibirsk State University
- 630090 Novosibirsk
- Russia
- International Tomography Center, Siberian Branch of Russian Academy of Sciences
- 630090 Novosibirsk
| | - Artem S. Bogomyakov
- International Tomography Center, Siberian Branch of Russian Academy of Sciences
- 630090 Novosibirsk
- Russia
| | - Nikita Y. Shmelev
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences
- Novosibirsk 630090
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
| | - Matvey V. Fedin
- International Tomography Center, Siberian Branch of Russian Academy of Sciences
- 630090 Novosibirsk
- Russia
| | - Georgiy B. Shul’pin
- Department of Dynamics of Chemical and Biologicl Processes, Semenov Institute of Chemical Physics, Russian Academy of Sciences
- Moscow 119991
- Russia
- Chair of Chemistry and Physics, Plekhanov Russian University of Economics
- Moscow 117997
| | - Maxim N. Sokolov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences
- Novosibirsk 630090
- Russia
- Novosibirsk State University
- 630090 Novosibirsk
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31
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Yang Z, Su R, Luo S, Spinney R, Cai M, Xiao R, Wei Z. Comparison of the reactivity of ibuprofen with sulfate and hydroxyl radicals: An experimental and theoretical study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 590-591:751-760. [PMID: 28302308 DOI: 10.1016/j.scitotenv.2017.03.039] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 02/28/2017] [Accepted: 03/05/2017] [Indexed: 05/17/2023]
Abstract
Hydroxyl radical (•OH) and sulfate radical anion (SO4•-) based advanced oxidation technologies (AOTs) are effective methods to treat trace organic contaminants (TrOCs) in engineered waters. Although both technologies result in the same overall removal of TrOCs, the mechanistic differences between these two radicals involved in the oxidation of TrOCs remain unclear. In this study, we experimentally examined the degradation kinetics of neutral ibuprofen (IBU), a representative TrOC, by •OH and SO4•- at pH3 in UV/H2O2 and UV/persulfate systems, respectively. The second-order rate constants (k) of IBU with •OH and SO4•- were determined to be 3.43±0.06×109 and 1.66±0.12×109M-1s-1, respectively. We also theoretically calculated the thermodynamic and kinetic behaviors for reactions of IBU with •OH and SO4•- using the density functional theory (DFT) M06-2X method with 6-311++G** basis set. The results revealed that H-atom abstraction is the most favorable pathway for both •OH and SO4•-, but due to the steric hindrance SO4•- exhibits significantly higher energy barriers than •OH. The theoretical calculations corroborate our experimental observation that SO4•- has a smaller k value than •OH in reacting with IBU. These comparative results are of fundamental and practical importance in understanding the electrophilic interactions between radicals and IBU molecules, and to help select preferred radical oxidation processes for optimal TrOCs removal in engineered waters.
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Affiliation(s)
- Zhihui Yang
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Rongkui Su
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Shuang Luo
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Richard Spinney
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA
| | - Meiqiang Cai
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China
| | - Ruiyang Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China.
| | - Zongsu Wei
- Grand Water Research Institute - Rabin Desalination Laboratory, The Wolfson Faculty of Chemical Engineering, Technion - Israel Institute of Technology, Technion City, Haifa 32000, Israel.
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32
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Yamasaki R, Takatsuji Y, Morimoto M, Ishikawa S, Fujinami T, Haruyama T. Sustainable process for functional group introduction onto HOPG by exposing OH and 1O2 using a radical vapor reactor (RVR) without any chemical reagents. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.03.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Jin L, Lv M, Wei Y, Lu J, Min S. Reactivity of 5-carboxycytosine toward addition and hydrogen abstraction by ·OH in acetonitrile: a computational study. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2017.1279286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Lingxia Jin
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi Sci-Tech University, Hanzhong, P.R. China
| | - Mengdan Lv
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi Sci-Tech University, Hanzhong, P.R. China
| | - Yawen Wei
- Periodical Offices of Chang’an University, Chang’an University, Xi’an, P.R. China
| | - Jiufu Lu
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi Sci-Tech University, Hanzhong, P.R. China
| | - Suotian Min
- Shaanxi Key Laboratory of Catalysis, School of Chemical & Environment Science, Shaanxi Sci-Tech University, Hanzhong, P.R. China
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34
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Luo S, Wei Z, Spinney R, Yang Z, Chai L, Xiao R. A novel model to predict gas-phase hydroxyl radical oxidation kinetics of polychlorinated compounds. CHEMOSPHERE 2017; 172:333-340. [PMID: 28088023 DOI: 10.1016/j.chemosphere.2017.01.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 01/01/2017] [Accepted: 01/03/2017] [Indexed: 06/06/2023]
Abstract
In this study, a novel model based on aromatic meta-substituent grouping was presented to predict the second-order rate constants (k) for OH oxidation of PCBs in gas-phase. Since the oxidation kinetics are dependent on the chlorination degree and position, we hypothesized that it may be more accurate for k value prediction if we group PCB congeners based on substitution positions (i.e., ortho (o), meta (m), and para (p)). To test this hypothesis, we examined the correlation of polarizability (α), a quantum chemical based descriptor for k values, with an empirical Hammett constant (σ+) on each substitution position. Our result shows that α is highly linearly correlated to ∑σo,m,p+ based on aromatic meta-substituents leading to the grouping based predictive model. With the new model, the calculated k values exhibited an excellent agreement with experimental measurements, and greater predictive power than the quantum chemical based quantitative structure activity relationship (QSAR) model. Further, the relationship of α and ∑σo,m,p+ for PCDDs congeners, together with highest occupied molecular orbital (HOMO) distribution, were used to validate the aromatic meta-substituent grouping method. This newly developed model features a combination of good predictability of quantum chemical based QSAR model and simplicity of Hammett relationship, showing a great potential for fast and computational tractable prediction of k values for gas-phase OH oxidation of polychlorinated compounds.
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Affiliation(s)
- Shuang Luo
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Zongsu Wei
- Grand Water Research Institute-Rabin Desalination Laboratory, Wolfson Faculty of Chemical Engineering, Technion-Israel Institute of Technology, Technion City, Haifa, 32000, Israel
| | - Richard Spinney
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, 43210, United States
| | - Zhihui Yang
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Liyuan Chai
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Ruiyang Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China.
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35
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Kinetic and mechanism studies of musk tonalide reacted with hydroxyl radical and the risk assessment of degradation products. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.06.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Effect of organic co-solvents in the evaluation of the hydroxyl radical scavenging activity by the 2-deoxyribose degradation assay: The paradigmatic case of α-lipoic acid. Biophys Chem 2017; 220:1-6. [DOI: 10.1016/j.bpc.2016.10.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 10/26/2016] [Accepted: 10/26/2016] [Indexed: 11/18/2022]
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37
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Yang Z, Luo S, Wei Z, Ye T, Spinney R, Chen D, Xiao R. Rate constants of hydroxyl radical oxidation of polychlorinated biphenyls in the gas phase: A single-descriptor based QSAR and DFT study. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2016; 211:157-164. [PMID: 26748251 DOI: 10.1016/j.envpol.2015.12.044] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 12/21/2015] [Accepted: 12/21/2015] [Indexed: 06/05/2023]
Abstract
The second-order rate constants (k) of hydroxyl radical (·OH) with polychlorinated biphenyls (PCBs) in the gas phase are of scientific and regulatory importance for assessing their global distribution and fate in the atmosphere. Due to the limited number of measured k values, there is a need to model the k values for unknown PCBs congeners. In the present study, we developed a quantitative structure-activity relationship (QSAR) model with quantum chemical descriptors using a sequential approach, including correlation analysis, principal component analysis, multi-linear regression, validation, and estimation of applicability domain. The result indicates that the single descriptor, polarizability (α), plays an important role in determining the reactivity with a global standardized function of lnk = -0.054 × α ‒ 19.49 at 298 K. In order to validate the QSAR predicted k values and expand the current k value database for PCBs congeners, an independent method, density functional theory (DFT), was employed to calculate the kinetics and thermodynamics of the gas-phase ·OH oxidation of 2,4',5-trichlorobiphenyl (PCB31), 2,2',4,4'-tetrachlorobiphenyl (PCB47), 2,3,4,5,6-pentachlorobiphenyl (PCB116), 3,3',4,4',5,5'-hexachlorobiphenyl (PCB169), and 2,3,3',4,5,5',6-heptachlorobiphenyl (PCB192) at 298 K at B3LYP/6-311++G**//B3LYP/6-31 + G** level of theory. The QSAR predicted and DFT calculated k values for ·OH oxidation of these PCB congeners exhibit excellent agreement with the experimental k values, indicating the robustness and predictive power of the single-descriptor based QSAR model we developed.
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Affiliation(s)
- Zhihui Yang
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Shuang Luo
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Zongsu Wei
- Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH, 43210, USA
| | - Tiantian Ye
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Richard Spinney
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH, 43210, USA
| | - Dong Chen
- Indiana University-Purdue University Fort Wayne, Fort Wayne, Indiana, 46805, USA
| | - Ruiyang Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, 410083, China.
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38
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Gozzi F, Oliveira SC, Dantas RF, Silva VO, Quina FH, Machulek A. Kinetic studies of the reaction between pesticides and hydroxyl radical generated by laser flash photolysis. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:1580-1584. [PMID: 25974279 DOI: 10.1002/jsfa.7258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 04/07/2015] [Accepted: 05/11/2015] [Indexed: 06/04/2023]
Abstract
BACKGROUND Due to contamination of the environment by pesticides and their mishandling, there is the need for treatment of contaminated sites and correct disposal of materials containing them. Thus, studies with advanced oxidation processes are expanding and can determine the rate constant of the hydroxyl radical with organic compounds of great importance in environmental contamination. In this context, the use of laser flash photolysis has been shown to be viable for the determination of these constants. RESULTS The reaction rate constants of different pesticides with HO(•) in degassed acetonitrile have been determined. They were 1.6 × 10(9) M(-1) s(-1), 0.6 × 10(9) M(-1) s(-1), 1.2 × 10(9) M(-1) s(-1), 2.4 × 10(9) M(-1) s(-1) and 2.2 × 10(9) M(-1) s(-1) for the pesticides carbaryl, propoxur, fenoxycarb, ethoxysulfuron and chlorimuron-ethyl, respectively. These values are about an order of magnitude smaller than the diffusion controlled rate and correlate with the relative rates of disappearance of the pesticides in the photo-Fenton reaction in water. CONCLUSION The correlation of the relative rate constants determined by laser flash photolysis with the relative rates of photo-Fenton degradation of the pesticides is compelling evidence for the participation of the hydroxyl radical in the degradation of these pesticides in the latter system.
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Affiliation(s)
- Fábio Gozzi
- Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Senador Filinto Muller 1555, CP 549, Campo Grande, MS, 79074-460, Brazil
| | - Silvio C Oliveira
- Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Senador Filinto Muller 1555, CP 549, Campo Grande, MS, 79074-460, Brazil
| | - Renato F Dantas
- School of Technology, University of Campinas UNICAMP, Paschoal Marmo 188, 13484-332, Limeira, SP, Brazil
| | - Volnir O Silva
- Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes 748, CP 26077, São Paulo, SP, 05513-970, Brazil
| | - Frank H Quina
- Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes 748, CP 26077, São Paulo, SP, 05513-970, Brazil
| | - Amilcar Machulek
- Institute of Chemistry, Federal University of Mato Grosso do Sul, Av. Senador Filinto Muller 1555, CP 549, Campo Grande, MS, 79074-460, Brazil
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39
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Gao Y, Ji Y, Li G, An T. Theoretical investigation on the kinetics and mechanisms of hydroxyl radical-induced transformation of parabens and its consequences for toxicity: Influence of alkyl-chain length. WATER RESEARCH 2016; 91:77-85. [PMID: 26773489 DOI: 10.1016/j.watres.2015.12.056] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Revised: 12/31/2015] [Accepted: 12/31/2015] [Indexed: 05/06/2023]
Abstract
As emerging organic contaminants (EOCs), the ubiquitous presence of preservative parabens in water causes a serious environmental concern. Hydroxyl radical ((•)OH) is a strong oxidant that can degrade EOCs through photochemistry in surface water environments as well as in advanced oxidation processes (AOPs). To better understand the degradation mechanisms, kinetics, and products toxicity of the preservative parabens in aquatic environments and AOPs, the (•)OH-initiated degradation reactions of the four parabens were investigated systematically using a computational approach. The four studied parabens with increase of alkyl-chain length were methylparaben (MPB), ethylparaben (EPB), propylparaben (PPB), and dibutylparaben (BPB). Results showed that the four parabens can be initially attacked by (•)OH through (•)OH-addition and H-abstraction routes. The (•)OH-addition route was more important for the degradation of shorter alkyl-chain parabens like MPB and EPB, while the H-abstraction route was predominant for the degradation of parabens with longer alkyl-chain for example PPB and BPB. In assessing the aquatic toxicity of parabens and their degradation products using the model calculations, the products of the (•)OH-addition route were found to be more toxic to green algae than original parabens. Although all degradation products were less toxic to daphnia and fish than corresponding parental parabens, they could be still harmful to these aquatic organisms. Furthermore, as alkyl-chain length increased, the ecotoxicity of parabens and their degradation products was found to be also increased.
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Affiliation(s)
- Yanpeng Gao
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Resources Utilization and Protection, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuemeng Ji
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Resources Utilization and Protection, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Guiying Li
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Resources Utilization and Protection, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
| | - Taicheng An
- State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Resources Utilization and Protection, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
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40
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Zhao J, Li P, Li X, Xia C, Li F. Straightforward synthesis of functionalized chroman-4-ones through cascade radical cyclization-coupling of 2-(allyloxy)arylaldehydes. Chem Commun (Camb) 2016; 52:3661-4. [DOI: 10.1039/c5cc09730d] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A novel and direct approach to synthesize a series of phosphonate, azide and hydroxy functionalized chroman-4-ones has been developed. The transformation appears to proceed via an intramolecular addition of in situ generated acyl radical onto alkene, followed by a radical/radical cross coupling.
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Affiliation(s)
- Jingjing Zhao
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- China
| | - Pan Li
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- China
| | - Xinjian Li
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- China
| | - Chungu Xia
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- China
| | - Fuwei Li
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou
- China
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41
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Santos MSF, Alves A, Madeira LM. Chemical and photochemical degradation of polybrominated diphenyl ethers in liquid systems - A review. WATER RESEARCH 2016; 88:39-59. [PMID: 26465809 DOI: 10.1016/j.watres.2015.09.044] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Revised: 07/24/2015] [Accepted: 09/27/2015] [Indexed: 06/05/2023]
Abstract
Polybrominated diphenyl ethers (PBDEs) are brominated flame retardants which have received a great deal of attention due to their persistence, potential to bioaccumulate and possible toxic effects. PBDEs have been globally detected in humans, wildlife and environment, highlighting the urgency of looking for effective removal technologies to mitigate their spread and accumulation in the environment. Among all environmental compartments, the water has raised particular attention. This paper aims to provide information about the suitability of the main degradation processes investigated to date (photolysis, zerovalent iron and TiO2 photocatalysis) for the degradation of PBDEs in water matrices. The most relevant criteria behind the design of a system for such purpose are discussed in detail for each individual process. The comparative analysis suggests that the oxidative degradation by TiO2 is the most appropriated technology to treat waters contaminated with PBDEs because higher debromination and mineralization degrees are achieved, preventing the formation/accumulation of lower brominated PBDE congeners and promoting the cracking of aromatic cores.
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Affiliation(s)
- Mónica S F Santos
- LEPABE - Laboratory for Process, Environmental, Biotechnology and Energy Engineering, Faculty of Engineering, University of Porto, R. Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal.
| | - Arminda Alves
- LEPABE - Laboratory for Process, Environmental, Biotechnology and Energy Engineering, Faculty of Engineering, University of Porto, R. Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal
| | - Luis M Madeira
- LEPABE - Laboratory for Process, Environmental, Biotechnology and Energy Engineering, Faculty of Engineering, University of Porto, R. Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal.
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42
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Xiao R, Ye T, Wei Z, Luo S, Yang Z, Spinney R. Quantitative Structure--Activity Relationship (QSAR) for the Oxidation of Trace Organic Contaminants by Sulfate Radical. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:13394-13402. [PMID: 26451961 DOI: 10.1021/acs.est.5b03078] [Citation(s) in RCA: 142] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The sulfate radical anion (SO4•–) based oxidation of trace organic contaminants (TrOCs) has recently received great attention due to its high reactivity and low selectivity. In this study, a meta-analysis was conducted to better understand the role of functional groups on the reactivity between SO4•– and TrOCs. The results indicate that compounds in which electron transfer and addition channels dominate tend to exhibit a faster second-order rate constants (kSO4•–) than that of H–atom abstraction, corroborating the SO4•– reactivity and mechanisms observed in the individual studies. Then, a quantitative structure activity relationship (QSAR) model was developed using a sequential approach with constitutional, geometrical, electrostatic, and quantum chemical descriptors. Two descriptors, ELUMO and EHOMO energy gap (ELUMO–EHOMO) and the ratio of oxygen atoms to carbon atoms (#O:C), were found to mechanistically and statistically affect kSO4•– to a great extent with the standardized QSAR model: ln kSO4•– = 26.8–3.97 × #O:C – 0.746 × (ELUMO–EHOMO). In addition, the correlation analysis indicates that there is no dominant reaction channel for SO4•– reactions with various structurally diverse compounds. Our QSAR model provides a robust predictive tool for estimating emerging micropollutants removal using SO4•– during wastewater treatment processes.
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Affiliation(s)
- Ruiyang Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University , Changsha, China , 410083
- Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution , Changsha, China , 410083
| | - Tiantian Ye
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University , Changsha, China , 410083
- Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution , Changsha, China , 410083
| | | | - Shuang Luo
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University , Changsha, China , 410083
- Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution , Changsha, China , 410083
| | - Zhihui Yang
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University , Changsha, China , 410083
- Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution , Changsha, China , 410083
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Xiao R, Zammit I, Wei Z, Hu WP, MacLeod M, Spinney R. Kinetics and Mechanism of the Oxidation of Cyclic Methylsiloxanes by Hydroxyl Radical in the Gas Phase: An Experimental and Theoretical Study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:13322-13330. [PMID: 26477990 DOI: 10.1021/acs.est.5b03744] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The ubiquitous presence of cyclic volatile methylsiloxanes (cVMS) in the global atmosphere has recently raised environmental concern. In order to assess the persistence and long-range transport potential of cVMS, their second-order rate constants (k) for reactions with hydroxyl radical ((•)OH) in the gas phase are needed. We experimentally and theoretically investigated the kinetics and mechanism of (•)OH oxidation of a series of cVMS, hexamethylcyclotrisiloxane (D3), octamethycyclotetrasiloxane (D4), and decamethycyclopentasiloxane (D5). Experimentally, we measured k values for D3, D4, and D5 with (•)OH in a gas-phase reaction chamber. The Arrhenius activation energies for these reactions in the temperature range from 313 to 353 K were small (-2.92 to 0.79 kcal·mol(-1)), indicating a weak temperature dependence. We also calculated the thermodynamic and kinetic behaviors for reactions at the M06-2X/6-311++G**//M06-2X/6-31+G** level of theory over a wider temperature range of 238-358 K that encompasses temperatures in the troposphere. The calculated Arrhenius activation energies range from -2.71 to -1.64 kcal·mol(-1), also exhibiting weak temperature dependence. The measured k values were approximately an order of magnitude higher than the theoretical values but have the same trend with increasing size of the siloxane ring. The calculated energy barriers for H-atom abstraction at different positions were similar, which provides theoretical support for extrapolating k for other cyclic siloxanes from the number of abstractable hydrogens.
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Affiliation(s)
- Ruiyang Xiao
- Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University , Changsha, Hunan 410083, China
- Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution , Changsha, Hunan 410083, China
| | - Ian Zammit
- Department of Environmental Science and Analytical Chemistry, Stockholm University , Svante Arrhenius väg 8, Stockholm SE-11418, Sweden
| | | | - Wei-Ping Hu
- Department of Chemistry and Biochemistry, National Chung Cheng University , Minxiong, Chia-Yi 62102, Taiwan
| | - Matthew MacLeod
- Department of Environmental Science and Analytical Chemistry, Stockholm University , Svante Arrhenius väg 8, Stockholm SE-11418, Sweden
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El-Agamey A, El-Hagrasy MA, Suenobu T, Fukuzumi S. Influence of pH on the decay of β-carotene radical cation in aqueous Triton X-100: A laser flash photolysis study. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2015; 146:68-73. [PMID: 25837728 DOI: 10.1016/j.jphotobiol.2015.02.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Revised: 02/17/2015] [Accepted: 02/19/2015] [Indexed: 11/25/2022]
Abstract
The identification of the spectral information of carotenoid neutral radicals is essential for studying their reactivities towards O2 and thereby evaluating their role in the antioxidant-prooxidant properties of the corresponding carotenoid. Recently, it was reported that β-carotene neutral radical (β-CAR) has an absorption maximum at 750 nm. This contradicts the results of many reports that show carotenoid neutral radicals (CAR) absorb in the same or near to the spectral region as their parent carotenoids. In this manuscript, the influence of pH on the decay of β-carotene radical cation (β-CAR-H(+)), generated in an aqueous solution of 2% Triton X-100 (TX-100), was investigated, employing laser flash photolysis (LFP) coupled with kinetic absorption spectroscopy, to identify the absorption bands of the β-carotene neutral radicals. By increasing the pH value of the solution, the decay of β-CAR-H(+) is enhanced and this enhancement is not associated with the formation of any positive absorption bands over the range 550-900 nm. By comparing these results with the literature, it can be concluded that β-carotene neutral radicals most probably absorb within the same spectral range as that of β-carotene. The reaction pathways of the reaction of β-CAR-H(+) with (-)OH have been discussed.
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Affiliation(s)
- Ali El-Agamey
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan; Chemistry Department, Faculty of Science, Damietta University, New Damietta, Damietta, Egypt
| | - Maha A El-Hagrasy
- Chemistry Department, Faculty of Science, Damietta University, New Damietta, Damietta, Egypt
| | - Tomoyoshi Suenobu
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Shunichi Fukuzumi
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
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45
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Bataineh H, Pestovsky O, Bakac A. Iron(II) Catalysis in Oxidation of Hydrocarbons with Ozone in Acetonitrile. ACS Catal 2015. [DOI: 10.1021/cs501962m] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hajem Bataineh
- Ames Laboratory and Chemistry
Department, Iowa State University, Ames, Iowa 50011, United States
| | - Oleg Pestovsky
- Ames Laboratory and Chemistry
Department, Iowa State University, Ames, Iowa 50011, United States
| | - Andreja Bakac
- Ames Laboratory and Chemistry
Department, Iowa State University, Ames, Iowa 50011, United States
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Rodriguez-Muñiz GM, Gomis J, Arques A, Amat AM, Marin ML, Miranda MA. Hydroxyl Radical as an Unlikely Key Intermediate in the Photodegradation of Emerging Pollutants. Photochem Photobiol 2014; 90:1467-9. [PMID: 25065677 DOI: 10.1111/php.12325] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 07/24/2014] [Indexed: 11/27/2022]
Affiliation(s)
- Gemma M. Rodriguez-Muñiz
- Instituto Universitario Mixto de Tecnología Química-Departamento de Química (UPV-CSIC); Valencia Spain
| | - Juan Gomis
- Grupo de Procesos de Oxidación Avanzada; Departamento de Ingeniería Textil y Papelera; Universidad Politécnica de Valencia; Alcoy Spain
| | - Antonio Arques
- Grupo de Procesos de Oxidación Avanzada; Departamento de Ingeniería Textil y Papelera; Universidad Politécnica de Valencia; Alcoy Spain
| | - Ana M. Amat
- Grupo de Procesos de Oxidación Avanzada; Departamento de Ingeniería Textil y Papelera; Universidad Politécnica de Valencia; Alcoy Spain
| | - M. Luisa Marin
- Instituto Universitario Mixto de Tecnología Química-Departamento de Química (UPV-CSIC); Valencia Spain
| | - Miguel A. Miranda
- Instituto Universitario Mixto de Tecnología Química-Departamento de Química (UPV-CSIC); Valencia Spain
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47
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Liu G. Recalcitrance of cyanuric acid to oxidative degradation by OH radical: theoretical investigation. RSC Adv 2014. [DOI: 10.1039/c4ra04687k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Electron deficiency of the triazine ring makes the reactions between cyanuric acid and OH radical energetically unfavorable.
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48
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Li DD, Han RM, Liang R, Chen CH, Lai W, Zhang JP, Skibsted LH. Hydroxyl radical reaction with trans-resveratrol: initial carbon radical adduct formation followed by rearrangement to phenoxyl radical. J Phys Chem B 2012; 116:7154-61. [PMID: 22650146 DOI: 10.1021/jp3033337] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In the reaction between trans-resveratrol (resveratrol) and the hydroxyl radical, kinetic product control leads to a short-lived hydroxyl radical adduct with an absorption maximum at 420 nm and a lifetime of 0.21 ± 0.01 μs (anaerobic acetonitrile at 25 °C) as shown by laser flash photolysis using N-hydroxypyridine-2(1H)-thione (N-HPT) as a "photo-Fenton" reagent. The transient spectra of the radical adduct are in agreement with density functional theory (DFT) calculations showing an absorption maximum at 442 or 422 nm for C2 and C6 hydroxyl adducts, respectively, and showing the lowest energy for the transition state leading to the C2 adduct compared to other radical products. From this initial product, the relative long-lived 4'-phenoxyl radical of resveratrol (τ = 9.9 ± 0.9 μs) with an absorption maximum at 390 nm is formed in a process with a time constant (τ = 0.21 ± 0.01 μs) similar to the decay constant for the C2 hydroxyl adduct (or a C2/C6 hydroxyl adduct mixture) and in agreement with thermodynamics identifying this product as the most stable resveratrol radical. The hydroxyl radical adduct to phenoxyl radical conversion with concomitant water dissociation has a rate constant of 5 × 10(6) s(-1) and may occur by intramolecular hydrogen atom transfer or by stepwise proton-assisted electron transfer. Photolysis of N-HPT also leads to a thiyl radical which adds to resveratrol in a parallel reaction forming a sulfur radical adduct with a lifetime of 0.28 ± 0.04 μs and an absorption maximum at 483 nm.
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Affiliation(s)
- Dan-Dan Li
- Department of Chemistry, Renmin University of China, Beijing 100872, PR China
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49
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Rodríguez-Muñiz GM, Marin ML, Lhiaubet-Vallet V, Miranda MA. Reactivity of nucleosides with a hydroxyl radical in non-aqueous medium. Chemistry 2012; 18:8024-7. [PMID: 22649034 DOI: 10.1002/chem.201201090] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Indexed: 12/27/2022]
Abstract
DNA damage: The reactivity of HO(.) with silylated 2'-deoxyribonucleosides was investigated in acetonitrile by means of a time-resolved technique. The obtained rate constants were in general slightly lower than those reported for the natural nucleosides in water. Analysis of the reaction mixture by UPLC-MS revealed that HO(.) attack occurred at the nucleobase (see scheme).
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Affiliation(s)
- Gemma M Rodríguez-Muñiz
- Instituto de Tecnología Química UPV-CSIC, Universidad Politécnica de Valencia, Consejo Superior de Investigaciones Científicas, Avenida de los Naranjos, s/n, 46022 Valencia, Spain
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50
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Li Y, Wen B, Ma W, Chen C, Zhao J. Photocatalytic degradation of aromatic pollutants: a pivotal role of conduction band electron in distribution of hydroxylated intermediates. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:5093-5099. [PMID: 22497472 DOI: 10.1021/es300655r] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The modulation of the yield distribution of intermediates formed in the photocatalytic degradation of organic pollutants is of extreme importance for the application of photocatalysis in environmental cleanup, as different intermediates usually exhibit distinct biological toxicity and secondary reactivity. In this paper, we report that the distribution of monohydroxylated intermediates (m-, p- and o-) formed during the photocatalytic oxidation of aromatic compounds changes with the variation of reaction conditions, such as O(2) partial pressure and substrate concentration. By detailed product analysis, theoretical calculation, and oxygen isotope labeling experiments, we show that these changes are due to the selective reduction of HO-adduct radicals (the precursors of hydroxylated intermediates) by conduction band electrons (e(cb)(-)) back to the original substrate, that is, p- and o-HO-adduct radicals are more susceptible to e(cb)(-) than the m- one. Our experiments give an example that, even under oxidative conditions, the yield distribution of isomeric intermediates can be modulated by e(cb)(-)-initiated reduction. This study also illustrates that the unique redox characteristics of photocatalysis, that is, both oxidation and reduction reactions take place on or near the surface of a single nanoparticle, can provide opportunities for the reaction control.
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Affiliation(s)
- Yue Li
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China
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