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Mai E, Malakar P, Batignani G, Martinati M, Ruhman S, Scopigno T. Orchestrating Nuclear Dynamics in a Permanganate Doped Crystal with Chirped Pump-Probe Spectroscopy. J Phys Chem Lett 2024; 15:6634-6646. [PMID: 38888442 DOI: 10.1021/acs.jpclett.4c00801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
Pump-probe spectroscopy is a powerful tool to investigate light-induced dynamical processes in molecules and solids. Targeting vibrational excitations occurring on the time scales of nuclear motions is challenging, as pulse durations shorter than a vibrational period are needed to initiate the dynamics, and complex experimental schemes are required to isolate weak signatures arising from wavepacket motion in different electronic states. Here, we demonstrate how introducing a temporal delay between the spectral components of femtosecond beams, namely a chirp resulting in the increase of their duration, can counterintuitively boost the desired signals by 2 orders of magnitude. Measuring the time-domain vibrational response of permanganate ions embedded in a KClO4 matrix, we identify an intricate dependence of the vibrational response on pulse chirps and probed wavelength that can be exploited to unveil weak signatures of the doping ions─otherwise dominated by the nonresonant matrix─or to obtain vibrational excitations pertaining only to the excited state, suppressing ground-state contributions.
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Affiliation(s)
- Emanuele Mai
- Dipartimento di Fisica, Sapienza, Universitá di Roma, Roma I-00185, Italy
- Istituto Italiano di Tecnologia, Center for Life Nano Science @Sapienza, Roma I-00161, Italy
| | - Partha Malakar
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Giovanni Batignani
- Dipartimento di Fisica, Sapienza, Universitá di Roma, Roma I-00185, Italy
- Istituto Italiano di Tecnologia, Center for Life Nano Science @Sapienza, Roma I-00161, Italy
| | - Miles Martinati
- Dipartimento di Fisica, Sapienza, Universitá di Roma, Roma I-00185, Italy
| | - Sanford Ruhman
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Tullio Scopigno
- Dipartimento di Fisica, Sapienza, Universitá di Roma, Roma I-00185, Italy
- Graphene Laboratories, Istituto Italiano di Tecnologia, Genova I-16163, Italy
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2
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Castro JI, Payan-Valero A, Valencia-Llano CH, Insuasty D, Rodríguez Macias JD, Ordoñez A, Valencia Zapata ME, Mina Hernández JH, Grande-Tovar CD. Evaluation of the Antibacterial, Anti-Cervical Cancer Capacity, and Biocompatibility of Different Graphene Oxides. Molecules 2024; 29:281. [PMID: 38257194 PMCID: PMC10821421 DOI: 10.3390/molecules29020281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 12/22/2023] [Accepted: 12/27/2023] [Indexed: 01/24/2024] Open
Abstract
Cancer stands as one of the deadliest diseases in human history, marked by an inferior prognosis. While traditional therapeutic methods like surgery, chemotherapy, and radiation have demonstrated success in inhibiting tumor cell growth, their side effects often limit overall benefits and patient acceptance. In this regard, three different graphene oxides (GO) with variations in their degrees of oxidation were studied chemically and tissue-wise. The accuracy of the synthesis of the different GO was verified by robust techniques using X-ray photoelectron spectroscopy (XPS), as well as conventional techniques such as infrared spectroscopy (FTIR), RAMAN spectroscopy, and X-ray diffraction (XRD). The presence of oxygenated groups was of great importance. It affected the physicochemical properties of each of the different graphene oxides demonstrated in the presence of new vibrational modes related to the formation of new bonds promoted by the graphitization of the materials. The toxicity analysis in the Hep-2 cell line of graphene oxide formulations at 250 µg/mL on the viability and proliferation of these tumor cells showed low activity. GO formulations did not show high antibacterial activity against Staphylococcus aureus and Escherichia coli strains. However, the different graphene oxides showed biocompatibility in the subdermal implantation model for 30, 60, and 90 days in the biomodels. This allowed healing by restoring hair and tissue architecture without triggering an aggressive immune response.
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Affiliation(s)
- Jorge Ivan Castro
- Tribology, Polymers, Powder Metallurgy and Solid Waste Transformations Research Group, Universidad del Valle, Calle 13 No. 100-00, Cali 76001, Colombia;
| | - Alana Payan-Valero
- Grupo Biomateriales Dentales, Escuela de Odontología, Universidad del Valle, Calle 4B # 36-00, Cali 76001, Colombia; (A.P.-V.); (C.H.V.-L.)
| | - Carlos Humberto Valencia-Llano
- Grupo Biomateriales Dentales, Escuela de Odontología, Universidad del Valle, Calle 4B # 36-00, Cali 76001, Colombia; (A.P.-V.); (C.H.V.-L.)
| | - Daniel Insuasty
- Departamento de Química y Biología, División de Ciencias Básicas, Universidad del Norte, Km 5 Vía Puerto Colombia, Barranquilla 081007, Colombia;
| | - Juan David Rodríguez Macias
- Programa de Medicina, Facultad de Ciencias de la Salud, Universidad Libre, Km 5 Vía Puerto Colombia, Barranquilla 081007, Colombia;
| | - Alejandra Ordoñez
- Grupo de Investigación de Fotoquímica y Fotobiología, Universidad del Atlántico, Carrera 30 Número 8-49, Puerto Colombia 081008, Colombia;
| | - Mayra Eliana Valencia Zapata
- Grupo de Materiales Compuestos, Escuela de Ingeniería de Materiales, Facultad de Ingeniería, Universidad del Valle, Calle 13 No. 100-00, Santiago de Cali 760032, Colombia; (M.E.V.Z.); (J.H.M.H.)
| | - Jose Herminsul Mina Hernández
- Grupo de Materiales Compuestos, Escuela de Ingeniería de Materiales, Facultad de Ingeniería, Universidad del Valle, Calle 13 No. 100-00, Santiago de Cali 760032, Colombia; (M.E.V.Z.); (J.H.M.H.)
| | - Carlos David Grande-Tovar
- Grupo de Investigación de Fotoquímica y Fotobiología, Universidad del Atlántico, Carrera 30 Número 8-49, Puerto Colombia 081008, Colombia;
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Chen T, Dong H, Yu Y, Chen J, Xu J, Sun Y, Guan X. Neutral Phenolic Contaminants Are Not Necessarily More Resistant to Permanganate Oxidation Than Their Dissociated Counterparts: Importance of Proton-Coupled Electron Transfer. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:17620-17628. [PMID: 37902719 DOI: 10.1021/acs.est.3c05495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2023]
Abstract
Despite decades of research on phenols oxidation by permanganate, there are still considerable uncertainties regarding the mechanisms accounting for the unexpected parabolic pH-dependent oxidation rate. Herein, the pH effect on phenols oxidation was reinvestigated experimentally and theoretically by highlighting the previously unappreciated proton transfer. The results revealed that the oxidation of protonated phenols occurred via proton-coupled electron transfer (PCET) pathways, which can switch from ETPT (electron transfer followed by proton transfer) to CEPT (concerted electron-proton transfer) or PTET (proton transfer followed by electron transfer) with an increase in pH. A PCET-based model was thus established, and it could fit the kinetic data of phenols oxidation by permanganate well. In contrast with what was previously thought, both the simulating results and the density functional theory calculation indicated the rate of CEPT reaction of protonated phenols with OH- as the proton acceptor was much higher than that of deprotonated phenols, which could account for the pH-rate profiles for phenols oxidation. Analysis of the quantitative structure-activity relationships among the modeled rate constants, Hammett constants, and pKa values of phenols further supports the idea that the oxidation of protonated phenols is dominated by PCET. This study improves our understanding of permanganate oxidation and suggests a new pattern of reactivity that may be applicable to other systems.
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Affiliation(s)
- Tiansheng Chen
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China
| | - Hongyu Dong
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, P. R. China
| | - Yanghai Yu
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China
| | - Jie Chen
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China
| | - Jihong Xu
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, P. R. China
| | - Yuankui Sun
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, P. R. China
| | - Xiaohong Guan
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China
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Wu S, Guo K, Xie R, He S, Wei W, Fang J. Enhancing the Abatement of Permanganate-inert Micropollutants: Multiple Roles of Nascent Manganese Dioxide in Permanganate Oxidation. WATER RESEARCH 2023; 245:120562. [PMID: 37708775 DOI: 10.1016/j.watres.2023.120562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 08/22/2023] [Accepted: 08/30/2023] [Indexed: 09/16/2023]
Abstract
Permanganate (Mn(VII)) is widely used as an oxidant in water treatment and usually reduced to nascent manganese dioxide (MnO2), which could promote Mn(VII) oxidation for the Mn(VII)-reactive compounds such as phenols and anilines. However, the removal of micropollutants containing diverse functional groups and the underlying mechanisms remain largely unexplored. This study reveals that Mn(VII)/nascent MnO2 was effective for the degradation of Mn(VII)-inert micropollutants, including sulfonamide antibiotics, β-blockers and trimethoprim, with observed first-order rate constants (k'obs) of 0.126 ∼ 9 min-1 at pH 4.0. The synergetic effect of Mn(VII) and nascent MnO2 on the degradation of Mn(VII)-inert micropollutants decreased significantly when pH increased from 4.0 to 9.5. MnO2 played multiple roles in micropollutant degradation, which acted as a catalyst to promote the Mn(VII) oxidation of trimethoprim and propranolol, as well as an oxidant in propranolol degradation. Besides, Mn(III) oxidation accounted for 58% of the overall degradation of propranolol, but was not important for trimethoprim oxidation. Hydroxylated products were common products formed in Mn(VII)/MnO2. Differently, trimethoprim tended to form single-ring products via MnO2-catalyzed Mn(VII) oxidation, while propranolol preferentially formed dimers via in situ formed MnO2 oxidation. This study is the first to report that MnO2 enhances the abatement of Mn(VII)-inert micropollutants during Mn(VII)-based water treatment and unravels the multiple roles of MnO2 in micropollutant degradation by Mn(VII)/MnO2.
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Affiliation(s)
- Sining Wu
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, P. R. China
| | - Kaiheng Guo
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, P. R. China.
| | - Ruijie Xie
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, P. R. China
| | - Shaoxiong He
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, P. R. China
| | - Wenrui Wei
- Guangzhou Environmental Protection Investment Group Co., Ltd., Guangzhou, 510170, China
| | - Jingyun Fang
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, P. R. China
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5
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Cayla M, Sonet D, Tarayre E, Bapt R, Bibal B. Tandem Oxidative Dearomatizations of Diphenylanthracene Atropisomers. J Org Chem 2023; 88:13067-13075. [PMID: 37673031 DOI: 10.1021/acs.joc.3c01252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
The first examples of tandem oxidative dearomatizations of 9,10-diphenylanthracene atropisomers with ortho,ortho'- formyl substituents are presented. In the presence of KMnO4, their stereoselective tandem double oxidation and spirocyclization mainly afford the syn or anti dearomatized 9,10-diphthalide anthracenes. Using Pinnick's reagent and depending on the conditions, the oxidation can mainly lead to the corresponding syn or anti diacids in good yields or to three oxidation products. An unprecedented further oxidative ring expansion toward dibenzo[b,e]oxepines is also reported.
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Affiliation(s)
- Mattéo Cayla
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Dorian Sonet
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Emilien Tarayre
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Romain Bapt
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Brigitte Bibal
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
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6
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Tavakoli M, Chiu YTT, Baldi P, Carlton AM, Van Vranken D. RMechDB: A Public Database of Elementary Radical Reaction Steps. J Chem Inf Model 2023; 63:1114-1123. [PMID: 36799778 PMCID: PMC9976277 DOI: 10.1021/acs.jcim.2c01359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
We introduce RMechDB, an open-access platform for aggregating, curating, and distributing reliable data about elementary radical reaction steps for computational radical reaction modeling and prediction. RMechDB contains over 5,300 elementary radical reaction steps, each with a single transition state at or around room temperature. These elementary step reactions are manually curated plausible arrow-pushing steps for organic radical reactions. The steps were taken from a variety of sources. Over 2,000 mechanistic steps were extracted from textbooks and/or constructed from research publications. Another 3,000 were taken from gas-phase atmospheric reactions of isoprene and other organic molecules on the MCM (Master Chemical Mechanism) Web site. Reactions are encoded in the SMIRKS format with accurate atom mapping and annotations for arrow-pushing mechanisms. At its core, RMechDB consists of a database schema with an online interactive search interface and a request portal for downloading the raw form of elementary step reactions with their metadata. It also offers an interface for submitting new reactions to RMechDB and expanding the data set through community contributions. Although there are several applications for RMechDB, it is primarily designed as a central platform of radical elementary steps with a unified and structured representation. We believe that this open access to this data and platform enables the extension of data-driven models for chemical reaction predictions and other chemoinformatics predictive tasks.
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Affiliation(s)
- Mohammadamin Tavakoli
- Department
of Computer Science, University of California,
Irvine, Irvine, California 92697, United States
| | - Yin Ting T. Chiu
- Department
of Chemistry, University of California,
Irvine, Irvine, California 92697, United States
| | - Pierre Baldi
- Department
of Computer Science, University of California,
Irvine, Irvine, California 92697, United States,E-mail:
| | - Ann Marie Carlton
- Department
of Chemistry, University of California,
Irvine, Irvine, California 92697, United States
| | - David Van Vranken
- Department
of Chemistry, University of California,
Irvine, Irvine, California 92697, United States,E-mail:
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7
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Ethylene scavenging film based on low-density polyethylene incorporating pumice and potassium permanganate and its application to preserve avocados. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.114200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Arndt S, Kohlpaintner PJ, Donsbach K, Waldvogel SR. Synthesis and Applications of Periodate for Fine Chemicals and Important Pharmaceuticals. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sebastian Arndt
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Philipp J. Kohlpaintner
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Kai Donsbach
- Virginia Commonwealth University, College of Engineering, Medicines for All Institute, 601 West Main Street, Richmond, Virginia 23284-3068, United States
| | - Siegfried R. Waldvogel
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
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9
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Role of N-Doping and O-Groups in Unzipped N-Doped CNT Carbocatalyst for Peroxomonosulfate Activation: Quantitative Structure–Activity Relationship. Catalysts 2022. [DOI: 10.3390/catal12080845] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
We examined the relationship between the intrinsic structure of a carbocatalyst and catalytic activity of peroxomonosulfate (PMS) activation for acetaminophen degradation. A series of nitrogen-doped carbon nanotubes with different degrees of oxidation was synthesized by the unzipping method. The linear regression analysis proposes that pyridinic N and graphitic N played a key role in the catalytic oxidation, rather than pyrrolic N and oxidized N. Pyridinic N reinforce the electron population in the graphitic framework and initiate the non-radical pathway via the formation of surface-bound radicals. Furthermore, graphitic N forms activated complexes (carbocatalyst-PMS*), facilitating the electron-transfer oxidative pathway. The correlation also affirms that -C=O was dominantly involved as a main active site, rather than -C-OH and -COOH. This study can be viewed as the first attempt to demonstrate the relationship between the fraction of N-groups and activity, and the quantity of O-groups and activity by active species (quenching studies) was established to reveal the role of N-groups and O-groups in the radical and non-radical pathways.
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10
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Nguyen NGT, Nguyen XT, Nguyen NH, Luu TXT, Dao XT. Ground solid permanganate oxidative coupling of thiols into symmetrical/unsymmetrical disulfides: selective and improved process. J Sulphur Chem 2022. [DOI: 10.1080/17415993.2022.2083914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
| | - Xuan-Triet Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
| | - Ngoc-Huy Nguyen
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
| | - Thi Xuan Thi Luu
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
- Department of Chemistry, Vietnam National University, Ho Chi Minh City, Vietnam
| | - Xuan-Tien Dao
- Faculty of Chemistry, University of Science, Ho Chi Minh City, Vietnam
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11
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Laszakovits JR, Kerr A, MacKay AA. Permanganate Oxidation of Organic Contaminants and Model Compounds. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:4728-4748. [PMID: 35356836 DOI: 10.1021/acs.est.1c03621] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Permanganate oxidation is an attractive environmental remediation strategy due to its low cost, ease of use, and wide range in reactivity. Here, permanganate reactivity trends are investigated for model organic compounds and organic contaminants. Second-order permanganate reaction rate constants were compiled for 215 compounds from 82 references (journal articles, conference proceedings, master's theses, and dissertations). Additionally, we validated some phenol rate constants and contribute a few additional phenol rate constants. Commonalities between contaminant oxidation products are also discussed, and we tentatively identify several model compound oxidation products. Aromatic rings, alcohols, and ether groups had low reaction rate constants with permanganate. Alkene reaction sites had the highest reaction rate constants, followed by phenols, anilines, and benzylic carbon-hydrogen bonds. Generally, permanganate reactivity follows electrophilic substitution trends at the reaction site where electron donating groups increase the rate of reaction, while electron withdrawing groups decrease the rate of reaction. Solution conditions, specifically, buffer type and concentration, may impact the rate of reaction, which could be due to either an ionic strength effect or the buffer ions acting as ligands. The impact of these solution conditions, unfortunately, precludes the development of a quantitative structure-activity relationship for permanganate reaction rate constants with the currently available data. We note that critical experimental details are often missing in the literature, which posed a challenge when comparing rate constants between studies. Future research directions on permanganate oxidation should seek to improve our understanding of buffer effects and to identify oxidation products for model compounds so that extrapolations can be made to more complex contaminant structures.
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Affiliation(s)
- Juliana R Laszakovits
- Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, Columbus, Ohio 43210, United States
| | - Adaline Kerr
- Department of Organismal Biology and Ecology, Colorado College, Colorado Springs, Colorado 80903, United States
| | - Allison A MacKay
- Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, Columbus, Ohio 43210, United States
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Chandrasekhar K, Velvizhi G, Venkata Mohan S. Bio-electrocatalytic remediation of hydrocarbons contaminated soil with integrated natural attenuation and chemical oxidant. CHEMOSPHERE 2021; 280:130649. [PMID: 33975233 DOI: 10.1016/j.chemosphere.2021.130649] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 03/27/2021] [Accepted: 04/21/2021] [Indexed: 06/12/2023]
Abstract
The present study aimed to assess the possibility of integrating natural attenuation (NA) and chemical oxidation (O) with the bio-electrocatalytic remediation (BET) process to remediate petroleum hydrocarbons contaminated soil. Six different reactors were operated, wherein in the first reactor was a NA system, and the second condition to the NA was supplemented with a chemical oxidant (NAO). These systems were compared with BET systems which were differentiated based on the position and distance between the electrodes. The study was performed by considering NA as a common condition in all the six different reactors viz., NA, NAO, NA + BET with 0.5 cm space amid electrodes (BETH-0.5), NAO + BET with 0.5 cm space amid electrodes (BETOH-0.5), NAO + BET with 1.0 cm space amid electrodes (BETOH-1.0), and NAO + BET with vertical electrodes at 1.0 cm distance (BETOV-1.0). The highest total petroleum hydrocarbons (TPH) degradation efficiency was observed with BETOH-0.5 (67 ± 0.8%) followed by BETOH-1.0 (62 ± 0.6%), BETH-0.5 (60%), BETOV-1.0 (56 ± 0.5%), NAO (46.6%), and NA (27.7%). In NA, the indigenous microorganisms remediate the organic contaminants. In the NAO system, KMnO4 actively breakdown the carbon-carbon double bond functional group. Further, in BETOH-0.5, an anodophilic bacteria enriched around the electrode reported enhanced treatment efficiency along with a maximum of 260 mV (1.65 mA). BET systems integrated with chemical oxidation processes were much more effective in the TPH removal process than an individual process. The BET method adopted here thus provides a good opportunity for bio-electrocatalytic remediation of TPH and resource recovery in the form of bioelectricity.
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Affiliation(s)
- K Chandrasekhar
- Bioengineering and Environmental Sciences Lab (BEES), Department of Energy and Environmental Engineering (DEEE), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India; School of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - G Velvizhi
- Bioengineering and Environmental Sciences Lab (BEES), Department of Energy and Environmental Engineering (DEEE), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India; CO(2) Research and Green Technologies Centre, VIT, Vellore, 632014, India
| | - S Venkata Mohan
- Bioengineering and Environmental Sciences Lab (BEES), Department of Energy and Environmental Engineering (DEEE), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India.
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13
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Advances in Vacuum Ultraviolet Photolysis in the Postharvest Management of Fruit and Vegetables Along the Value Chains: a Review. FOOD BIOPROCESS TECH 2021. [DOI: 10.1007/s11947-021-02703-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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14
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Cui Y, Li Y, Wang W, Wang X, Lin J, Mai X, Song G, Naik N, Guo Z. Flotation separation of acrylonitrile-butadienestyrene (ABS) and high impact polystyrene (HIPS) from waste electrical and electronic equipment (WEEE) by potassium permanganate surface modification. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118767] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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German KE, Fedoseev AM, Grigoriev MS, Kirakosyan GA, Dumas T, Den Auwer C, Moisy P, Lawler KV, Forster PM, Poineau F. A 70-Year-Old Mystery in Technetium Chemistry Explained by the New Technetium Polyoxometalate [H 7 O 3 ] 4 [Tc 20 O 68 ] ⋅ 4H 2 O. Chemistry 2021; 27:13624-13631. [PMID: 34245056 DOI: 10.1002/chem.202102035] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Indexed: 11/11/2022]
Abstract
[H7 O3 ]4 [Tc20 O68 ] ⋅ 4H2 O [1] was prepared from an aqueous Tc2 O7 solution concentrated over anhydrous H2 SO4 . [Tc20 O68 ]4- is the first polyanionic species to be reported for Tc. The unit cell contains one centrosymmetric [Tc20 O68 ]4- polyanion as well as hydronium ions and water molecules. The core of the structure consists of four Tc(V)O6 octahedra that form a square Tc4 O4 ring. The four Tc(V)O6 octahedra are decorated by sixteen Tc(VII)O4 tetrahedra. Calculations show the bonding within the Tc4 O4 ring to consist of a 3-center bond formed between each neighboring pair of Tc atoms and their bridging oxygen. Calculations also indicate that a strong d→d electronic transition at 513 nm is the origin of the red color of [1]. The characterization of red HTcO4 solutions by X-ray absorption spectroscopy has complemented the description of this compound in aqueous solution. The formation mechanisms in solution, including the possible role of technetium's radioactivity in the formation of [1], are discussed.
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Affiliation(s)
- Konstantin E German
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr.31-4, Moscow, Russian Federation
| | - Alexander M Fedoseev
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr.31-4, Moscow, Russian Federation
| | - Mikhail S Grigoriev
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr.31-4, Moscow, Russian Federation
| | - Gayane A Kirakosyan
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr.31-4, Moscow, Russian Federation.,Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Leninsky pr.31, Russian Federation
| | - Thomas Dumas
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | | | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Keith V Lawler
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, NV, 89154, USA
| | - Paul M Forster
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, NV, 89154, USA
| | - Frederic Poineau
- Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Las Vegas, NV, 89154, USA
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16
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Achard T, Bellemin‐Laponnaz S. Recent Advances on Catalytic Osmium‐Free Olefin
syn
‐Dihydroxylation. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Thierry Achard
- Département des Matériaux Organiques Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) Université de Strasbourg CNRS UMR‐7504 23 rue du Loess, BP 43 67034 Strasbourg Cedex 2 France
| | - Stéphane Bellemin‐Laponnaz
- Département des Matériaux Organiques Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) Université de Strasbourg CNRS UMR‐7504 23 rue du Loess, BP 43 67034 Strasbourg Cedex 2 France
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17
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Hejna A, Olszewski A, Zedler Ł, Kosmela P, Formela K. The Impact of Ground Tire Rubber Oxidation with H 2O 2 and KMnO 4 on the Structure and Performance of Flexible Polyurethane/Ground Tire Rubber Composite Foams. MATERIALS 2021; 14:ma14030499. [PMID: 33494274 PMCID: PMC7864513 DOI: 10.3390/ma14030499] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/15/2021] [Accepted: 01/18/2021] [Indexed: 01/27/2023]
Abstract
The use of waste tires is a very critical issue, considering their environmental and economic implications. One of the simplest and the least harmful methods is conversion of tires into ground tire rubber (GTR), which can be introduced into different polymer matrices as a filler. However, these applications often require proper modifications to provide compatibility with the polymer matrix. In this study, we examined the impact of GTR oxidation with hydrogen peroxide and potassium permanganate on the processing and properties of flexible polyurethane/GTR composite foams. Applied treatments caused oxidation and introduction of hydroxyl groups onto the surface of rubber particles, expressed by the broad range of their hydroxyl numbers. It resulted in noticeable differences in the processing of the polyurethane system and affected the structure of flexible composite foams. Treatment with H2O2 resulted in a 31% rise of apparent density, while the catalytic activity of potassium ions enhanced foaming of system decreased density by 25% and increased the open cell content. Better mechanical performance was noted for H2O2 modifications (even by 100% higher normalized compressive strength), because of the voids in cell walls and incompletely developed structure during polymerization, accelerated by KMnO4 treatment. This paper shows that modification of ground tire rubber is a very promising approach, and when properly performed may be applied to engineer the structure and performance of polyurethane composite foams.
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18
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Gurawa A, Kumar M, Kashyap S. Me 3SI-promoted chemoselective deacetylation: a general and mild protocol. RSC Adv 2021; 11:19310-19315. [PMID: 35478635 PMCID: PMC9033574 DOI: 10.1039/d1ra03209g] [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: 04/24/2021] [Accepted: 05/16/2021] [Indexed: 11/21/2022] Open
Abstract
A catalytic and practical approach for the selective removal of acetyl groups using various substrates bearing orthogonal moieties has been demonstrated under ambient conditions.
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Affiliation(s)
- Aakanksha Gurawa
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology Jaipur, (MNIT)
- Jaipur-302017
- India
| | - Manoj Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology Jaipur, (MNIT)
- Jaipur-302017
- India
| | - Sudhir Kashyap
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology Jaipur, (MNIT)
- Jaipur-302017
- India
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19
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da Silva MJ, da Silva GRN, Sampaio VFC, Vilanculo CB, Fernandes SA, Teixeira MG. One-pot synthesis of benzaldehyde derivatives in PdCl2-catalyzed reactions with H2O2 in alcoholic solutions. CHEMICAL PAPERS 2020. [DOI: 10.1007/s11696-020-01408-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Choi Y, Kim SS, Kim JH, Kang J, Choi E, Choi SE, Kim JP, Kwon O, Kim DW. Graphene Oxide Nanoribbon Hydrogel: Viscoelastic Behavior and Use as a Molecular Separation Membrane. ACS NANO 2020; 14:12195-12202. [PMID: 32885959 DOI: 10.1021/acsnano.0c05902] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The preparation of carbon materials based hydrogels and their viscoelastic properties are essential for their broad application and scale-up. However, existing studies are mainly focused on graphene derivatives and carbon nanotubes, and the behavior of graphene nanoribbon (GNR), a narrow strip of graphene, remains elusive. Herein, we demonstrate the concentration-driven gelation of oxidized GNR (graphene oxide nanoribbon, GONR) in aqueous solvents. Exfoliated individual GONRs sequentially assemble into strings (∼1 mg/mL), nanoplates (∼20 mg/mL), and a macroporous scaffold (50 mg/mL) with increasing concentration. The GONR hydrogels exhibit viscoelastic shear-thinning behavior and can be shear-coated to form large-area GONR films on substrates. The entangled and stacked structure of the GONR film contributed to outstanding nanofiltration performance under high pressure, cross-flow, and long-term filtration, while the precise molecular separation with 100% rejection rate was maintained for sub-nanometer molecules.
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Affiliation(s)
- Yunkyu Choi
- Department of Chemical and Biomolecular Engineering, YONSEI University, Yonsei-ro 50, Seodaemun-gu, Seoul, (03722), Republic of Korea
| | - Sung-Soo Kim
- Carbon Composite Materials Research Center, Korea Institute of Science and Technology, 92 Chudong-ro Bongdong-eup, Wanju-gun, Jeollabuk-do 55324, Republic of Korea
| | - Ji Hoon Kim
- Department of Chemical and Biomolecular Engineering, YONSEI University, Yonsei-ro 50, Seodaemun-gu, Seoul, (03722), Republic of Korea
| | - Junhyeok Kang
- Department of Chemical and Biomolecular Engineering, YONSEI University, Yonsei-ro 50, Seodaemun-gu, Seoul, (03722), Republic of Korea
| | - Eunji Choi
- Department of Chemical and Biomolecular Engineering, YONSEI University, Yonsei-ro 50, Seodaemun-gu, Seoul, (03722), Republic of Korea
| | - Seung Eun Choi
- Department of Chemical and Biomolecular Engineering, YONSEI University, Yonsei-ro 50, Seodaemun-gu, Seoul, (03722), Republic of Korea
| | - Jeong Pil Kim
- Department of Chemical and Biomolecular Engineering, YONSEI University, Yonsei-ro 50, Seodaemun-gu, Seoul, (03722), Republic of Korea
| | - Ohchan Kwon
- Department of Chemical and Biomolecular Engineering, YONSEI University, Yonsei-ro 50, Seodaemun-gu, Seoul, (03722), Republic of Korea
| | - Dae Woo Kim
- Department of Chemical and Biomolecular Engineering, YONSEI University, Yonsei-ro 50, Seodaemun-gu, Seoul, (03722), Republic of Korea
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21
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Jiang H, Zhang Y, Wang H. Surface Reactions in Selective Modification: The Prerequisite for Plastic Flotation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:9742-9756. [PMID: 32659077 DOI: 10.1021/acs.est.9b07861] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Improper disposal of waste plastic has caused much environmental pollution, but plastic recycling can reduce the amount of new and residual waste plastic in the environment through source control. Plastic flotation can separate waste plastics with similar physical and chemical properties, which suggests its promising application in plastic recycling. With the help of the different hydrophilicities waste plastic can be separated by flotation, and hydrophilization can be accomplished by surface modifications. However, no systematic studies addressing these surface reactions have been published yet, and such modifications are a prerequisite for plastic flotation. In this critical review, we not only summarize the various modification mechanisms, including physical regulation, surface oxidation, surface degradation, dechlorination, and coating, but also have reasonably added additional information for some reactions covering surface reconstruction, plastic degradation, polymer stability, wastewater treatment, soil remediation, and chemical recycling of plastic. An entirely novel concept, the "plastic gene", is also proposed to elaborate on some contradictory results. Plastic flotation with clear surface reactions may promote plastic recycling and thereby control waste plastic at the source, save energy, and reduce microplastics. We also predict challenges for clean, efficient, and practical surface modifications and plastic flotation.
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Affiliation(s)
- Hongru Jiang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan P.R. China
| | - Yingshuang Zhang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan P.R. China
| | - Hui Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 Hunan P.R. China
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22
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Haggag OS, Malakar P, Pokhilko P, Stanton JF, Krylov AI, Ruhman S. The elusive dynamics of aqueous permanganate photochemistry. Phys Chem Chem Phys 2020; 22:10043-10055. [PMID: 32338267 DOI: 10.1039/c9cp07028a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Despite decades of investigation, mechanistic details of aqueous permanganate photo-decomposition remain unclear. Here we follow photoinduced dynamics of aqueous permanganate with femtosecond spectroscopy. Photoexcitation of KMnO4(aq) in the visible unleashes a sub-picosecond cascade of non-radiative transitions, leading to a distinct species which relaxes to S0 with a lifetime of 16 ps. Tuning excitation to the UV shows increasing formation of a metastable intermediate, which outlives our ∼1 ns window of detection. Guided by electronic structure calculations and observations from three pulse excitation experiments, we assign the 16 ps species as the lowest Jahn-Teller component of the 3T1 triplet state and suggest a plausible sequence of radiationless transitions, which rapidly populate it. In conjunction with photodecomposition quantum yields obtained from the literature, these results demonstrate that aqueous permanganate photo-decomposition proceeds through a long-lived intermediate which is formed in parallel to the triplet in less than one ps upon UV absorption. The possibility that this is the postulated highly oxidative peroxo species, a fraction of which leads to the stable (MnO2- + O2) fragments, is discussed. Finally, periodic modulations detected in the pump-probe signal are assigned to ground-state vibrational coherences excited by impulsive Raman. Their wavelength-dependent absolute phases outline the borders between adjacent electronic transitions in the linear spectrum of permanganate.
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Affiliation(s)
- Omer S Haggag
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel.
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23
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Caglar M, Silkina I, Brown BT, Thorneywork AL, Burton OJ, Babenko V, Gilbert SM, Zettl A, Hofmann S, Keyser UF. Tunable Anion-Selective Transport through Monolayer Graphene and Hexagonal Boron Nitride. ACS NANO 2020; 14:2729-2738. [PMID: 31891480 PMCID: PMC7098055 DOI: 10.1021/acsnano.9b08168] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 12/31/2019] [Indexed: 05/23/2023]
Abstract
Membranes that selectively filter for both anions and cations are central to technological applications from clean energy generation to desalination devices. 2D materials have immense potential as these ion-selective membranes due to their thinness, mechanical strength, and tunable surface chemistry; however, currently, only cation-selective membranes have been reported. Here we demonstrate the controllable cation and anion selectivity of both monolayer graphene and hexagonal boron nitride. In particular, we measure the ionic current through membranes grown by chemical vapor deposition containing well-known defects inherent to scalably produced and wet-transferred 2D materials. We observe a striking change from cation selectivity with monovalent ions to anion selectivity by controlling the concentration of multivalent ions and inducing charge inversion on the 2D membrane. Furthermore, we find good agreement between our experimental data and theoretical predictions from the Goldman-Hodgkin-Katz equation and use this model to extract selectivity ratios. These tunable selective membranes conduct up to 500 anions for each cation and thus show potential for osmotic power generation.
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Affiliation(s)
- Mustafa Caglar
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Inese Silkina
- Department
of Materials Science and Metallurgy, University
of Cambridge, Cambridge CB3 0FS, United Kingdom
| | - Bertram T. Brown
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Alice L. Thorneywork
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Oliver J. Burton
- Department
of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - Vitaliy Babenko
- Department
of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - Stephen Matthew Gilbert
- Department
of Physics, University of California, Berkeley, Berkeley, California 94720, United States
- Materials
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
- Kavli Energy
NanoScience Institute at the University of California, Berkeley and
the Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Alex Zettl
- Department
of Physics, University of California, Berkeley, Berkeley, California 94720, United States
- Materials
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
- Kavli Energy
NanoScience Institute at the University of California, Berkeley and
the Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Stephan Hofmann
- Department
of Engineering, University of Cambridge, Cambridge CB3 0FA, United Kingdom
| | - Ulrich F. Keyser
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
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24
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Markus J, Puchľová E, Pinčeková L, Moncol J, Doháňošová J, Berkeš D, Caletková O. Synthesis and Derivatization of 3‐Aroyl Pyroglutamic Acids. ChemistrySelect 2020. [DOI: 10.1002/slct.202000162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jozef Markus
- Department of Organic Chemistry Radlinského 9 812 37 Bratislava Slovak Republic
| | - Eva Puchľová
- Department of Organic Chemistry Radlinského 9 812 37 Bratislava Slovak Republic
| | - Lucia Pinčeková
- Department of Organic Chemistry Radlinského 9 812 37 Bratislava Slovak Republic
| | - Ján Moncol
- Department of Inorganic Chemistry Radlinského 9 812 37 Bratislava Slovak Republic
| | - Jana Doháňošová
- Central Laboratories Faculty of Chemical and Food Technology, Slovak University of Technology Radlinského 9 812 37 Bratislava Slovak Republic
| | - Dušan Berkeš
- Department of Organic Chemistry Radlinského 9 812 37 Bratislava Slovak Republic
| | - Oľga Caletková
- Department of Organic Chemistry Radlinského 9 812 37 Bratislava Slovak Republic
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25
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Barbon S, Stocco E, Dalzoppo D, Todros S, Canale A, Boscolo-Berto R, Pavan P, Macchi V, Grandi C, De Caro R, Porzionato A. Halogen-Mediated Partial Oxidation of Polyvinyl Alcohol for Tissue Engineering Purposes. Int J Mol Sci 2020; 21:E801. [PMID: 31991838 PMCID: PMC7038068 DOI: 10.3390/ijms21030801] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 01/21/2020] [Accepted: 01/23/2020] [Indexed: 02/06/2023] Open
Abstract
Partial oxidation of polyvinyl alcohol (PVA) with potassium permanganate turned out to be an efficient method to fabricate smart scaffolds for tissue engineering, endowed with biodegradation and protein delivery capacity. This work considered for the first time the use of halogens (bromine, chlorine and iodine) as less aggressive agents than potassium permanganate to perform controlled PVA oxidation, in order to prevent degradation of polymer molecular size upon chemical modification. Oxidized PVA solutions were chemically characterized (i.e., dinitrophenylhydrazine assay, viscosity measurements, molecular size distribution) before preparing physically cross-linked hydrogels. Scaffolds were assessed for their mechanical properties and cell/tissue biocompatibiliy through cytotoxic extract test on IMR-90 fibroblasts and subcutaneous implantation into BALB/c mice. According to chemical investigations, bromine and iodine allowed for minor alteration of polymer molecular weight. Uniaxial tensile tests demonstrated that oxidized scaffolds had decreased mechanical resistance to deformation, suggesting tunable hydrogel stiffness. Finally, oxidized hydrogels exhibited high biocompatibility both in vitro and in vivo, resulting neither to be cytotoxic nor to elicit severe immunitary host reaction in comparison with atoxic PVA. In conclusion, PVA hydrogels oxidized by halogens were successfully fabricated in the effort of adapting polymer characteristics to specific tissue engineering applications.
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Affiliation(s)
- Silvia Barbon
- Department of Neurosciences, Section of Human Anatomy, University of Padova, Via A. Gabelli 65, 35121 Padova, Italy; (S.B.); (E.S.); (R.B.-B.); (V.M.); (A.P.)
- L.i.f.e.L.a.b. Program, Consorzio per la Ricerca Sanitaria (CORIS), Veneto Region, Via N. Giustiniani 2, 35128 Padova, Italy
| | - Elena Stocco
- Department of Neurosciences, Section of Human Anatomy, University of Padova, Via A. Gabelli 65, 35121 Padova, Italy; (S.B.); (E.S.); (R.B.-B.); (V.M.); (A.P.)
- L.i.f.e.L.a.b. Program, Consorzio per la Ricerca Sanitaria (CORIS), Veneto Region, Via N. Giustiniani 2, 35128 Padova, Italy
| | - Daniele Dalzoppo
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Via F. Marzolo 5, 35128 Padova, Italy; (D.D.); (C.G.)
| | - Silvia Todros
- Department of Industrial Engineering, Centre for Mechanics of Biological Materials, University of Padova, Via Venezia 1, 35131 Padova, Italy; (S.T.); (P.P.)
| | - Antonio Canale
- Department of Statistical Sciences, University of Padova, Via C. Battisti 241, 35121 Padova, Italy;
| | - Rafael Boscolo-Berto
- Department of Neurosciences, Section of Human Anatomy, University of Padova, Via A. Gabelli 65, 35121 Padova, Italy; (S.B.); (E.S.); (R.B.-B.); (V.M.); (A.P.)
| | - Piero Pavan
- Department of Industrial Engineering, Centre for Mechanics of Biological Materials, University of Padova, Via Venezia 1, 35131 Padova, Italy; (S.T.); (P.P.)
- Fondazione Istituto di Ricerca Pediatrica Città della Speranza, 35121 Padova, Italy
| | - Veronica Macchi
- Department of Neurosciences, Section of Human Anatomy, University of Padova, Via A. Gabelli 65, 35121 Padova, Italy; (S.B.); (E.S.); (R.B.-B.); (V.M.); (A.P.)
- L.i.f.e.L.a.b. Program, Consorzio per la Ricerca Sanitaria (CORIS), Veneto Region, Via N. Giustiniani 2, 35128 Padova, Italy
| | - Claudio Grandi
- Department of Pharmaceutical and Pharmacological Sciences, University of Padova, Via F. Marzolo 5, 35128 Padova, Italy; (D.D.); (C.G.)
- Foundation for Biology and Regenerative Medicine, Tissue Engineering and Signaling (T.E.S.) Onlus, 35030 Padova, Italy
| | - Raffaele De Caro
- Department of Neurosciences, Section of Human Anatomy, University of Padova, Via A. Gabelli 65, 35121 Padova, Italy; (S.B.); (E.S.); (R.B.-B.); (V.M.); (A.P.)
- L.i.f.e.L.a.b. Program, Consorzio per la Ricerca Sanitaria (CORIS), Veneto Region, Via N. Giustiniani 2, 35128 Padova, Italy
| | - Andrea Porzionato
- Department of Neurosciences, Section of Human Anatomy, University of Padova, Via A. Gabelli 65, 35121 Padova, Italy; (S.B.); (E.S.); (R.B.-B.); (V.M.); (A.P.)
- L.i.f.e.L.a.b. Program, Consorzio per la Ricerca Sanitaria (CORIS), Veneto Region, Via N. Giustiniani 2, 35128 Padova, Italy
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26
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Slater TS, McNamara ME, Orr PJ, Foley TB, Ito S, Wakamatsu K. Taphonomic experiments resolve controls on the preservation of melanosomes and keratinous tissues in feathers. PALAEONTOLOGY 2020; 63:103-115. [PMID: 32025055 PMCID: PMC6988486 DOI: 10.1111/pala.12445] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 05/15/2019] [Indexed: 06/10/2023]
Abstract
Fossils are a key source of data on the evolution of feather structure and function through deep time, but their ability to resolve macroevolutionary questions is compromised by an incomplete understanding of their taphonomy. Critically, the relative preservation potential of two key feather components, melanosomes and keratinous tissue, is not fully resolved. Recent studies suggesting that melanosomes are preferentially preserved conflict with observations that melanosomes preserve in fossil feathers as external moulds in an organic matrix. To date, there is no model to explain the latter mode of melanosome preservation. We addressed these issues by degrading feathers in systematic taphonomic experiments incorporating decay, maturation and oxidation in isolation and combination. Our results reveal that the production of mouldic melanosomes requires interactions with an oxidant and is most likely to occur prior to substantial maturation. This constrains the taphonomic conditions under which melanosomes are likely to be fossilized. Critically, our experiments also confirm that keratinous feather structures have a higher preservation potential than melanosomes under a range of diagenetic conditions, supporting hitherto controversial hypotheses that fossil feathers can retain degraded keratinous structures.
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Affiliation(s)
- Tiffany S. Slater
- School of Biological, Earth & Environmental SciencesUniversity College CorkCorkIreland
| | - Maria E. McNamara
- School of Biological, Earth & Environmental SciencesUniversity College CorkCorkIreland
| | - Patrick J. Orr
- UCDSchool of Earth SciencesUniversity College DublinDublinIreland
| | - Tara B. Foley
- Department of Anatomy & NeuroscienceUniversity College CorkCorkIreland
| | - Shosuke Ito
- Department of ChemistryFujita Health University School of Health SciencesToyoakeAichiJapan
| | - Kazumasa Wakamatsu
- Department of ChemistryFujita Health University School of Health SciencesToyoakeAichiJapan
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27
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Gurawa A, Kumar M, Rao DS, Kashyap S. KMnO 4-catalyzed chemoselective deprotection of acetate and controllable deacetylation–oxidation in one pot. NEW J CHEM 2020. [DOI: 10.1039/d0nj04321d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A highly chemoselective and facile protocol for deacetylation of a diverse range of substrates tolerating several sensitive functionalities was accomplished under environmentally friendly conditions.
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Affiliation(s)
- Aakanksha Gurawa
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology
- Jaipur-302017
- India
| | - Manoj Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology
- Jaipur-302017
- India
| | - Dodla S. Rao
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology
- Jaipur-302017
- India
| | - Sudhir Kashyap
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology
- Jaipur-302017
- India
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28
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Sadeghi K, Lee Y, Seo J. Ethylene Scavenging Systems in Packaging of Fresh Produce: A Review. FOOD REVIEWS INTERNATIONAL 2019. [DOI: 10.1080/87559129.2019.1695836] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Kambiz Sadeghi
- Department of Packaging, Yonsei University, Wonju-si, South Korea
| | - Younsuk Lee
- Department of Packaging, Yonsei University, Wonju-si, South Korea
| | - Jongchul Seo
- Department of Packaging, Yonsei University, Wonju-si, South Korea
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29
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Zhu Y, Zhao C, Liang J, Shang R, Zhu X, Ding L, Deng H, Zheng H, Strathmann TJ. Rapid removal of diclofenac in aqueous solution by soluble Mn(III) (aq) generated in a novel Electro-activated carbon fiber-permanganate (E-ACF-PM) process. WATER RESEARCH 2019; 165:114975. [PMID: 31430653 DOI: 10.1016/j.watres.2019.114975] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 07/29/2019] [Accepted: 08/11/2019] [Indexed: 06/10/2023]
Abstract
Electrolysis and permanganate (PM) oxidation are two commonly used technologies for water treatment. However, they are often handicapped by their slow reaction rates. To improve the removal efficiency of refractory contaminants, we combined electrolysis with PM using an activated carbon fiber (ACF) as cathode (E-ACF-PM) for the first time to treat diclofenac (DCF) in aqueous solution. Up to 90% DCF was removed in 5 min by E-ACF-PM process. In comparison, only 3.95 and 27.35% of DCF was removed by individual electrolysis and PM oxidation at the same time, respectively. Acidic condition was more conducive to DCF removal. Surprisingly, soluble Mn(III) (aq) formed on the surface of ACF was demonstrated as the principal oxidizing agent in E-ACF-PM process. Further studies showed that all three components (electrolysis + ACF + PM) were necessary to facilitate the heterogeneous generation of reactive Mn(III) (aq). Moreover, SEM images and XPS spectra of ACF before and after treatment revealed that the morphologies and elemental compositions of reacted ACF were nearly unchanged during the E-ACF-PM process. ACF can be remained active and utilized to the rapid degradation of DCF in E-ACF-PM process even after reused for 20 times. Therefore, the E-ACF-PM process may provide a novel and effective alternative on the generation of reactive Mn(III) (aq) in situ for water treatment by green electrochemical reactions.
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Affiliation(s)
- Yunhua Zhu
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Chun Zhao
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China.
| | - Jialiang Liang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Ran Shang
- Delft University of Technology, P.O. Box 5048, 2600, GA, Delft, the Netherlands
| | - Xuanmo Zhu
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Lei Ding
- School of Civil Engineering and Architecture, Anhui University of Technology, 59 Hudong Road, Maanshan, 243002, PR China
| | - Huiping Deng
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai, 200092, PR China
| | - Huaili Zheng
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Timothy J Strathmann
- Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, 80401, USA
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30
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Yang ZH, Ou JH, Dong CD, Chen CW, Lin WH, Kao CM. Remediation of TCE-contaminated groundwater using KMnO 4 oxidation: laboratory and field-scale studies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:34027-34038. [PMID: 30232775 DOI: 10.1007/s11356-018-3099-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 08/28/2018] [Indexed: 06/08/2023]
Abstract
The objectives of this study were to (1) conduct laboratory bench and column experiments to determine the oxidation kinetics and optimal operational parameters for trichloroethene (TCE)-contaminated groundwater remediation using potassium permanganate (KMnO4) as oxidant and (2) to conduct a pilot-scale study to assess the efficiency of TCE remediation by KMnO4 oxidation. The controlling factors in laboratory studies included soil oxidant demand (SOD), molar ratios of KMnO4 to TCE, KMnO4 decay rate, and molar ratios of Na2HPO4 to KMnO4 for manganese dioxide (MnO2) production control. Results show that a significant amount of KMnO4 was depleted when it was added in a soil/water system due to the existence of natural soil organic matters. The presence of natural organic material in soils can exert a significant oxidant demand thereby reducing the amount of KMnO4 available for the destruction of TCE as well as the overall oxidation rate of TCE. Supplement of higher concentrations of KMnO4 is required in the soil systems with high SOD values. Higher KMnO4 application resulted in more significant H+ and subsequent pH drop. The addition of Na2HPO4 could minimize the amount of produced MnO2 particles and prevent the clogging of soil pores, and TCE oxidation efficiency would not be affected by Na2HPO4. To obtain a complete TCE removal, the amount of KMnO4 used to oxidize TCE needs to be higher than the theoretical molar ratio of KMnO4 to TCE based on the stoichiometry equation. Relatively lower oxidation rates are obtained with lower initial TCE concentrations. The half-life of TCE decreased with increased KMnO4 concentrations. Results from the pilot-scale study indicate that a significant KMnO4 decay occurs after the injection due to the reaction of KMnO4 with soil organic matters, and thus, the amount of KMnO4, which could be transported from the injection point to the downgradient area, would be low. The effective influence zone of the KMnO4 oxidation was limited to the KMnO4 injection area (within a 3-m radius zone). Migration of KMnO4 to farther downgradient area was limited due to the reaction of KMnO4 to natural organic matters. To retain a higher TCE removal efficiency, continuous supplement of high concentrations of KMnO4 is required. The findings would be useful in designing an in situ field-scale ISCO system for TCE-contaminated groundwater remediation using KMnO4 as the oxidant.
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Affiliation(s)
- Zong-Han Yang
- Apollo Technology Co., Ltd., Kaohsiung City, 80248, Taiwan
| | - Jiun-Hau Ou
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung City, 80424, Taiwan
| | - Cheng-Di Dong
- Department of Marine Environmental Engineering, National Kaohsiung Marine University, Kaohsiung City, 81157, Taiwan
| | - Chiu-Wen Chen
- Department of Marine Environmental Engineering, National Kaohsiung Marine University, Kaohsiung City, 81157, Taiwan
| | - Wei-Han Lin
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung City, 80424, Taiwan
| | - Chih-Ming Kao
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung City, 80424, Taiwan.
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31
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3-BocNH-ABNO-catalyzed aerobic oxidation of alcohol at room temperature and atmospheric pressure. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.150994] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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32
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Potassium Permanganate-Based Ethylene Scavengers for Fresh Horticultural Produce as an Active Packaging. FOOD ENGINEERING REVIEWS 2019. [DOI: 10.1007/s12393-019-09193-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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33
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Shih YJ, Chien SK, Jhang SR, Lin YC. Chemical leaching, precipitation and solvent extraction for sequential separation of valuable metals in cathode material of spent lithium ion batteries. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2019.04.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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34
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Zhuang J, Wang S, Tan Y, Xiao R, Chen J, Wang X, Jiang L, Wang Z. Degradation of sulfadimethoxine by permanganate in aquatic environment: Influence factors, intermediate products and theoretical study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 671:705-713. [PMID: 30939323 DOI: 10.1016/j.scitotenv.2019.03.277] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Revised: 03/04/2019] [Accepted: 03/18/2019] [Indexed: 06/09/2023]
Abstract
The excess sulfadimethoxine (SDM) in the environment could lead to antibiotic resistance by microorganisms and may do harm to many aquatic organisms. In this work, the removal of SDM by potassium permanganate (KMnO4) was comprehensively studied. The influence of various factors, including the pH, oxidant doses, and temperature, on SDM removal were investigated. The optimal reaction conditions were determined to be pH 5.0, T = 25 °C and [KMnO4]0 = 200 μmol L-1. Anions (Cl-, SO42-, HCO32-, and NO3-) and cations (K+, Ca2+, Mg2+, and NH4+) had no significant influence on the removal of SDM. However, H2PO4- improved the efficiency of SDM removal by KMnO4. Humic acid (0-10 mg L-1) promoted the removal of SDM, which was attributed to the generation of in situ MnO2. Meanwhile, the degradation of SDM in various water matrices was studied, and the removal order was ultrapure water > Jiuxiang river water ≈ synthetic water > secondary clarifier effluent. According to ten intermediate products identified and a frontier electron densities (FED) calculation, several pathways were proposed that involve the oxidation of amidogen, the cleavage of CS and SN bonds, and an oligomerization reaction. The predicted toxicity assessment indicated that most of the degradation products were not harmful to aquatic organisms except SDM dimers (connection by HNNH), suggesting that byproducts, such as dimers, formed during the oxidation of SDM and other sulfonamides should be taken into consideration. In sum, KMnO4 has the potential to remove SDM from the aquatic environment.
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Affiliation(s)
- Jugui Zhuang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing 210023, PR China
| | - Siyuan Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing 210023, PR China
| | - Yi Tan
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing 210023, PR China
| | - Runmin Xiao
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing 210023, PR China
| | - Jing Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing 210023, PR China
| | - Xinghao Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing 210023, PR China
| | - Lijuan Jiang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing 210023, PR China
| | - Zunyao Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, Nanjing 210023, PR China.
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35
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Sinclair RC, Coveney PV. Modeling Nanostructure in Graphene Oxide: Inhomogeneity and the Percolation Threshold. J Chem Inf Model 2019; 59:2741-2745. [PMID: 31018633 PMCID: PMC6593394 DOI: 10.1021/acs.jcim.9b00114] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Indexed: 11/28/2022]
Abstract
Graphene oxide (GO) is an amorphous 2D material, which has found widespread use in the fields of chemistry, physics, and materials science due to its similarity to graphene with the benefit of being far easier to synthesize and process. However, the standard of GO characterization is very poor because its structure is irregular, being sensitive to the preparation method, and it has a propensity to transform due to its reactive nature. Atomistic simulations of GO are common, but the nanostructure in these simulations is often based on little evidence or thought. We have written a computer program to generate graphene oxide nanostructures for general purpose atomistic simulation based on theoretical and experimental evidence. The structures generated offer a significant improvement to the current standard of randomly placed oxidized functional groups and successfully recreate the two-phase nature of oxidized and unoxidized graphene domains observed in microscopy experiments. Using this model, we reveal new features of GO structure and predict that a critical point in the oxidation reaction exists as the oxidized region reaches a percolation threshold. Even by a conservative estimate, we show that, if the carbon to oxygen ratio is kept above 6, a continuous aromatic network will remain, preserving many of graphene's desirable properties, irrespective of the oxidation method or the size distribution of graphene sheets. This is an experimentally achievable degree of oxidation and should aid better GO synthesis for many applications.
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Affiliation(s)
- Robert C. Sinclair
- Centre
for Computational Science, University College
London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Peter V. Coveney
- Centre
for Computational Science, University College
London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
- Computational
Science Laboratory, Institute for Informatics, Faculty of Science, University of Amsterdam, Amsterdam 1098XH, The Netherlands
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36
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Laszakovits JR, MacKay AA. Removal of cyanotoxins by potassium permanganate: Incorporating competition from natural water constituents. WATER RESEARCH 2019; 155:86-95. [PMID: 30831427 DOI: 10.1016/j.watres.2019.02.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 01/31/2019] [Accepted: 02/05/2019] [Indexed: 06/09/2023]
Abstract
In recent years, harmful algal blooms capable of producing toxins including microcystins, cylindrospermopsin, and saxitoxin have increased in occurrence and severity. These toxins can enter drinking water treatment plants and, if not effectively removed, pose a serious threat to human health. The work here investigated the efficacy of permanganate oxidation as a treatment strategy, with a focus on incorporating competition by cyanobacterial cells and dissolved organic matter (DOM). We report rate constants of 272 ± 23 M-1 s-1 for the reaction between permanganate and microcystin-LR, 0.26 ± 0.05 M-1 s-1 for the reaction between permanganate and cylindrospermopsin, and, using chemical analogs, estimate a maximum rate constant of 2.7 ± 0.2 M-1 s-1 for the reaction between permanganate and saxitoxin. We conclude that permanganate only shows potential to remove microcystins. No pH (6-10) or alkalinity (0-50 mM) dependence was observed for the rate of reaction between microcystin-LR and permanganate; however, a temperature dependence was observed and can be characterized by an activation energy of 16 ± 5 kJ mol-1. The competition posed by cyanobacterial cells was quantified by an apparent second order rate constant of 2.5 ± 0.3 × 10-6 L μg chl-a-1 s-1. From this apparent second order rate constant, it was concluded that cyanobacterial cells are not efficient scavengers of permanganate within typical contact times but this second order rate constant can be used to accurately predict microcystin degradation in algal-impacted waters. The competition posed by DOM depended on both the amount of DOM present (as measured by TOC) and its electron donating capacity (as predicted by SUVA-254 or E2/E3 ratio). DOM was concluded to scavenge permanganate efficiently and we forward that this should be considered in permanganate dosing calculations.
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Affiliation(s)
- Juliana R Laszakovits
- Department of Civil, Environmental, and Geodetic Engineering at The Ohio State University, USA
| | - Allison A MacKay
- Department of Civil, Environmental, and Geodetic Engineering at The Ohio State University, USA.
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37
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LaMartina KB, Kuck HK, Oglesbee LS, Al-Odaini A, Boaz NC. Selective benzylic C-H monooxygenation mediated by iodine oxides. Beilstein J Org Chem 2019; 15:602-609. [PMID: 30931001 PMCID: PMC6423598 DOI: 10.3762/bjoc.15.55] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 02/19/2019] [Indexed: 12/30/2022] Open
Abstract
A method for the selective monooxdiation of secondary benzylic C–H bonds is described using an N-oxyl catalyst and a hypervalent iodine species as a terminal oxidant. Combinations of ammonium iodate and catalytic N-hydroxyphthalimide (NHPI) were shown to be effective in the selective oxidation of n-butylbenzene directly to 1-phenylbutyl acetate in high yield (86%). This method shows moderate substrate tolerance in the oxygenation of substrates containing secondary benzylic C–H bonds, yielding the corresponding benzylic acetates in good to moderate yield. Tertiary benzylic C–H bonds were shown to be unreactive under similar conditions, despite the weaker C–H bond. A preliminary mechanistic analysis suggests that this NHPI-iodate system is functioning by a radical-based mechanism where iodine generated in situ captures formed benzylic radicals. The benzylic iodide intermediate then solvolyzes to yield the product ester.
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Affiliation(s)
- Kelsey B LaMartina
- Department of Chemistry and Physics, North Central College, 30 N. Brainard Street, Naperville, IL 60540 USA
| | - Haley K Kuck
- Department of Chemistry and Physics, North Central College, 30 N. Brainard Street, Naperville, IL 60540 USA
| | - Linda S Oglesbee
- Department of Chemistry and Physics, North Central College, 30 N. Brainard Street, Naperville, IL 60540 USA
| | - Asma Al-Odaini
- Department of Chemistry and Physics, North Central College, 30 N. Brainard Street, Naperville, IL 60540 USA
| | - Nicholas C Boaz
- Department of Chemistry and Physics, North Central College, 30 N. Brainard Street, Naperville, IL 60540 USA.,Department of Chemistry, Frick Chemical Laboratory, Princeton University, Washington Road, Princeton, NJ 08544 USA.,Permanent address: Department of Chemistry, North Central College, 30 N. Brainard Street, Naperville, IL 60540 USA; phone: +1-630-637-5187
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38
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Laszakovits JR, Patterson A, Hipsher C, MacKay AA. Diethyl phenylene diamine (DPD) oxidation to measure low concentration permanganate in environmental systems. WATER RESEARCH 2019; 151:403-412. [PMID: 30622084 DOI: 10.1016/j.watres.2018.12.031] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 11/30/2018] [Accepted: 12/16/2018] [Indexed: 06/09/2023]
Abstract
Permanganate has been used traditionally in drinking water treatment for its oxidation properties and ease of use. The concentration of permanganate in treatment conditions is low and difficult to detect. A colorimetric method using diethylphenylene diamine (DPD) oxidation to measure low levels (i.e., less than 6 μM) of permanganate in water was developed and applied to quantify permanganate scavenging by dissolved organic matter (DOM). Manganese dioxide (MnO2) particles were shown to interfere with DPD oxidation; however, particles were removed effectively using 0.1 μm PVDF filters prior to reaction with DPD. DOM and complexed-Mn(III) were concluded to not interfere with the DPD reaction. The DPD method was validated by obtaining the second-order rate constant for permanganate reaction with phenol (1.7 ± 0.2 M-1 s-1), and comparing to the rate constant obtained independently by monitoring phenol degradation (i.e., UPLC-UV) (1.6 ± 0.2 M-1 s-1). Permanganate reaction with DOM isolate samples did not follow pseudo-first order kinetics. Faster reaction rates were observed with higher ionic strength (1 mM versus 5 mM carbonate). No change in reaction rates with pH was observed at lower ionic strength (1 mM); while at higher ionic strength, the reaction rate was faster at pH 7 than at pH 10. In contrast, linear kinetics were observed for permanganate reaction with DOM in filtered whole water samples. These samples showed similar trends with pH and ionic strength as for DOM isolates. The presented method is valid to quantify permanganate reaction rates with organic contaminants or with natural scavengers.
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Affiliation(s)
- Juliana R Laszakovits
- Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, United States
| | - Andrea Patterson
- Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, United States
| | - Carissa Hipsher
- Environmental Science Graduate Program, The Ohio State University, United States
| | - Allison A MacKay
- Department of Civil, Environmental, and Geodetic Engineering, The Ohio State University, United States.
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39
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Oh H, Park A, Jeong K, Han SB, Lee H. Copper‐Catalyzed 1,2‐Bistrifluoromethylation of Terminal Alkenes. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801675] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hyunseok Oh
- Therapeutics & Biotechnology DivisionKorea Research Institute of Chemical Technology 141 Gajeongro, Yuseong Daejeon 34114 Republic of Korea
- Department of ChemistryYonsei University Seoul 120-749 Korea
| | - Areum Park
- Therapeutics & Biotechnology DivisionKorea Research Institute of Chemical Technology 141 Gajeongro, Yuseong Daejeon 34114 Republic of Korea
- Department of ChemistryYonsei University Seoul 120-749 Korea
| | - Kyu‐Sung Jeong
- Department of ChemistryYonsei University Seoul 120-749 Korea
| | - Soo Bong Han
- Therapeutics & Biotechnology DivisionKorea Research Institute of Chemical Technology 141 Gajeongro, Yuseong Daejeon 34114 Republic of Korea
- Department of Medicinal Chemistry and PharmacologyUniversity of Science and Technology 217 Gajeongro, Yuseong Daejeon 305-355 Republic of Korea
| | - Hyuk Lee
- Therapeutics & Biotechnology DivisionKorea Research Institute of Chemical Technology 141 Gajeongro, Yuseong Daejeon 34114 Republic of Korea
- Graduate School of New Drug Discovery and DevelopmentChungnam University 99 Daehakro, Yuseong Daejeon 34134 Republic of Korea
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40
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Hewage N, Daddario P, Lau KSF, Guberman-Pfeffer MJ, Gascón JA, Zeller M, Lee CO, Khalil GE, Gouterman M, Brückner C. Bacterio- and Isobacteriodilactones by Stepwise or Direct Oxidations of meso-Tetrakis(pentafluorophenyl)porphyrin. J Org Chem 2019; 84:239-256. [PMID: 30484650 DOI: 10.1021/acs.joc.8b02628] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Porpholactones are porphyrinoids in which one or more β,β'-bonds of the parent chromophore were replaced by lactone moieties. Accessible to varying degrees by direct and nonselective oxidations of porphyrins, the rational syntheses of all five dilactone isomers along stepwise, controlled, and high-yielding routes via porphyrin → tetrahydroxyisobacteriochlorin metal complexes → isobacteriochlorindilactone metal complexes or porphyrin → tetrahydroxybacteriochlorin → bacteriochlorindilactone (and related) pathways, respectively, are described. A major benefit of these complementary routes over established methods is the simplicity of the isolation of the dilactones because of the reduced number of side products formed. In an alternative approach we report the direct and selective conversion of free base meso-tetrakis(pentafluorophenyl)porphyrin to all isomers of free base isobacteriodilactones using the oxidant cetyltrimethylN+MnO4-. The solid-state structures of some of the isomers and their precursors are reported, providing data on the conformational modulation induced by the derivatizations. We also rationalize computationally their differing thermodynamic stability and electronic properties. In making new efficient routes toward these dilactone isomers available, we enable the further study of this diverse class of porphyrinoids.
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Affiliation(s)
- Nisansala Hewage
- Department of Chemistry , University of Connecticut , Unit 3060, Storrs , Connecticut 06269-3060 , United States
| | - Pedro Daddario
- Department of Chemistry , University of Connecticut , Unit 3060, Storrs , Connecticut 06269-3060 , United States
| | - Kimberly S F Lau
- Department of Chemistry , University of Connecticut , Unit 3060, Storrs , Connecticut 06269-3060 , United States.,Department of Chemistry , University of Washington , Box 351700, Seattle , Washington 98195 , United States
| | - Matthew J Guberman-Pfeffer
- Department of Chemistry , University of Connecticut , Unit 3060, Storrs , Connecticut 06269-3060 , United States
| | - José A Gascón
- Department of Chemistry , University of Connecticut , Unit 3060, Storrs , Connecticut 06269-3060 , United States
| | - Matthias Zeller
- Department of Chemistry , Purdue University , 101 Wetherill Hall, 560 Oval Drive , West Lafayette , Indiana 47907-2084 , United States
| | - Christal O Lee
- Department of Chemistry , University of Washington , Box 351700, Seattle , Washington 98195 , United States
| | - Gamal E Khalil
- Department of Chemistry , University of Washington , Box 351700, Seattle , Washington 98195 , United States
| | - Martin Gouterman
- Department of Chemistry , University of Washington , Box 351700, Seattle , Washington 98195 , United States
| | - Christian Brückner
- Department of Chemistry , University of Connecticut , Unit 3060, Storrs , Connecticut 06269-3060 , United States
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41
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Chen L, Lin M, Yang P. Reproducible mesoporous silica-coated gold@silver nanoprobes for the bright colorimetric sensing of ascorbic acid. NEW J CHEM 2019. [DOI: 10.1039/c9nj02310k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Herein, a colorimetric approach for the detection of ascorbic acid (AA) was developed by controlling the surface chemistry of silica-coated gold nanorod@silver nanoparticles (AuNR@Ag@mSiO2).
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Affiliation(s)
- Ling Chen
- School of Materials Science and Engineering
- University of Jinan
- Jinan 250022
- China
| | - Meng Lin
- Key Laboratory for Colloid and Interface Chemistry of State Education Ministry
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- China
| | - Ping Yang
- School of Materials Science and Engineering
- University of Jinan
- Jinan 250022
- China
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42
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5-(6-Hydroxy-6-methyl-5-oxoheptan-2-yl)-2-methyl Phenyl Acetate. MOLBANK 2018. [DOI: 10.3390/m1041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We synthesized a novel compound, 5-(6-hydroxy-6-methyl-5-oxoheptan-2-yl)-2-methylphenyl acetate, in a good yield by oxidation of 1-O-acetyl-xanthorrizol using potassium permanganate in acidic condition. The structure was elucidated by Fourier Transform Infrared (FTIR), 1H-Nuclear Magnetic Resonance (NMR) and 13C-NMR, two-dimensional (2D)-HSQC, Distortionless Enhancement by Polarization Transfer (DEPT), 2D-Heteronuclear Multiple Bond Correlation (HMBC), and High-Resolution Mass Spectra (HRMS) spectral data.
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43
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Haines BE, Nelson BM, Grandner JM, Kim J, Houk KN, Movassaghi M, Musaev DG. Mechanism of Permanganate-Promoted Dihydroxylation of Complex Diketopiperazines: Critical Roles of Counter-cation and Ion-Pairing. J Am Chem Soc 2018; 140:13375-13386. [PMID: 30295476 DOI: 10.1021/jacs.8b08371] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The mechanism of permanganate-mediated dual C-H oxidation of complex diketopiperazines has been examined with density functional theory computations. The products of these oxidations are enabling intermediates in the synthesis of structurally diverse ETP natural products. We evaluated, for the first time, the impact of ion-pairing and aggregation states of the permanganate ion and counter-cations, such as bis(pyridine)-silver(I) (Ag+) and tetra- n-butylammonium (TBA+), on the C-H oxidation mechanism. The C-H abstraction occurs through an open shell singlet species, as noted previously, followed by O-rebound and a competing OH-rebound pathway. The second C-H oxidation proceeds with a second equivalent of oxidant with lower free energy barriers than the first C-H oxidation due to directing effects and the generation of a more reactive oxidant species after the first C-H oxidation. The success and efficiency of the second C-H oxidation are found to be critically dependent on the presence of an ion-paired oxidant. We used the developed mechanistic knowledge to rationalize an experimentally observed oxidation pattern for C3-indole-substituted diketopiperazine (+)-5 under optimal oxidation conditions: namely, the formation of diol (-)-6 as a single diastereomer and lack of the ketone products. We proposed two factors that may impede the ketone formation: (i) the conformational flexibility of the diketopiperazine ring, and (ii) hindrance of this site, making it less accessible to the ion-paired oxidant species.
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Affiliation(s)
- Brandon E Haines
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry , Emory University , Atlanta , Georgia 30322 , United States
| | - Brandon M Nelson
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Jessica M Grandner
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095-1569 , United States
| | - Justin Kim
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - K N Houk
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095-1569 , United States
| | - Mohammad Movassaghi
- Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Djamaladdin G Musaev
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry , Emory University , Atlanta , Georgia 30322 , United States
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Frenzel RA, Romanelli GP, Pizzio LR. Novel catalyst based on mono- and di-vanadium substituted Keggin polyoxometalate incorporated in poly(acrylic acid-co-acrylamide) polymer for the oxidation of sulfides. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2018.07.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Sultan S, Shah BA. Carbon‐Carbon and Carbon‐Heteroatom Bond Formation Reactions Using Unsaturated Carbon Compounds. CHEM REC 2018; 19:644-660. [DOI: 10.1002/tcr.201800095] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 09/12/2018] [Indexed: 12/21/2022]
Affiliation(s)
- Shaista Sultan
- Natural Product Chemistry Division and AcSIRCSIR-Indian Institute of Integrative Medicine Jammu- 180001
| | - Bhahwal Ali Shah
- Natural Product Chemistry Division and AcSIRCSIR-Indian Institute of Integrative Medicine Jammu- 180001
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Lee HK, Kim JH, Oh W, Choi SJ. Spontaneous reductive decomposition behavior of hydrogen permanganate in water for chemical decontamination of nuclear power plants. J Radioanal Nucl Chem 2018. [DOI: 10.1007/s10967-018-5994-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kim MS, Lee HJ, Lee KM, Seo J, Lee C. Oxidation of Microcystins by Permanganate: pH and Temperature-Dependent Kinetics, Effect of DOM Characteristics, and Oxidation Mechanism Revisited. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:7054-7063. [PMID: 29791799 DOI: 10.1021/acs.est.8b01447] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Oxidative degradation of six representative microcystins (MCs) (MC-RR, -LR, -YR, -LF, -LW, and -LA) by potassium permanganate (KMnO4; Mn(VII)) was investigated, focusing on the temperature- and pH-dependent reaction kinetics, the effect of dissolved organic matter (DOM), and the oxidation mechanisms. Second-order rate constants for the reactions of the six MCs with Mn(VII) ( kMn(VII),MC) were determined to be 160.4-520.1 M-1 s-1 (MC-RR > -LR ≈ -YR > -LF ≈ -LW > -LA) at pH 7.2 and 21 °C. The kMn(VII),MC values exhibited activation energies ranging from 15.1 to 22.4 kJ mol-1. With increasing pH from 2 to 11, the kMn(VII),MC values decreased until pH 5, and plateaued over the pH range of 5-11, except for that of MC-YR (which increased at pH > 8). Species-specific second-order rate constants were calculated using predicted p Ka values of MCs. The oxidation of MCs in natural waters was accurately predicted by the kinetic model using kMn(VII),MC and Mn(VII) exposure (∫[Mn(VII)]dt) values. Among different characteristics of DOM in natural waters, UV254, SUVA254, and the abundance of humic-like substances characterized by fluorescence spectroscopy exhibited good correlation with ∫[Mn(VII)]dt. A thorough product study of MC-LR oxidation by Mn(VII) was performed using liquid chromatography-mass spectrometry.
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Affiliation(s)
- Min Sik Kim
- School of Urban and Environmental Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulju-gun, Ulsan 44919 , Republic of Korea
| | - Hye-Jin Lee
- School of Urban and Environmental Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulju-gun, Ulsan 44919 , Republic of Korea
| | - Ki-Myeong Lee
- School of Urban and Environmental Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulju-gun, Ulsan 44919 , Republic of Korea
| | - Jiwon Seo
- School of Urban and Environmental Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulju-gun, Ulsan 44919 , Republic of Korea
| | - Changha Lee
- School of Urban and Environmental Engineering , Ulsan National Institute of Science and Technology (UNIST) , 50 UNIST-gil , Ulju-gun, Ulsan 44919 , Republic of Korea
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Ahmed KAM. Exploitation of KMnO4 material as precursors for the fabrication of manganese oxide nanomaterials. JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE 2018. [DOI: 10.1016/j.jtusci.2015.06.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Khalid Abdelazez Mohamed Ahmed
- Department of Chemistry, Faculty of Science and Technology, Al-Neelain University, P.O. Box 12702, Khartoum, Sudan
- Department of Chemistry, Faculty of Science and Education, Taif University, P.O. Box 888, 5700, Saudi Arabia
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Burns NK, Ashton TD, Stevenson PG, Pearson JR, Fox IL, Pfeffer FM, Francis PS, Smith ZM, Barnett NW, Chen L, White JM, Conlan XA. Extraction, identification and detection of synthetic cannabinoids found pre-ban in herbal products in Victoria, Australia. Forensic Chem 2018. [DOI: 10.1016/j.forc.2017.12.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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