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Kulesa KM, Padilha DS, Thapa B, Mazumder S, Losovyj Y, Schlegel HB, Scarpellini M, Verani CN. A bioinspired cobalt catalyst based on a tripodal imidazole/pyridine platform capable of water reduction and oxidation. J Inorg Biochem 2023; 242:112162. [PMID: 36841008 DOI: 10.1016/j.jinorgbio.2023.112162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 02/04/2023] [Accepted: 02/13/2023] [Indexed: 02/17/2023]
Abstract
The prototypical drug carrier [CoII(L1)Cl]PF6 (1), where L1 is a tripodal amine bound to pyridine and methyl-imidazoles, had its electrocatalytic water splitting activity studied under different pH conditions. This species contains a high-spin 3d7 CoII metal center, and is capable of generating both H2 from water reduction and O2 from water oxidation. Turnover numbers reach 390 after 3 h for water reduction. Initial water oxidation activity is molecular, with TONs of 71 at pH 7 and 103 at pH 11.5. The results reveal that species 1 can undergo several redox transformations, including reduction to the 3d8 CoI species that precedes a LS3d6 hydride for water reduction, as well as nominal CoIVO and CoIII-OOH species required for water oxidation. Post-catalytic analyses confirm the molecular nature of reduction and support initial molecular activity for oxidation.
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Affiliation(s)
- Krista M Kulesa
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA
| | - Diego S Padilha
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-611, Brazil
| | - Bishnu Thapa
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA
| | - Shivnath Mazumder
- Department of Chemistry, Indian Institute of Technology Jammu, Jammu 181221, India
| | - Yaroslav Losovyj
- Department of Chemistry, Indiana University, Bloomington, 800 E. Kirkwood Avenue, Bloomington, IN 47405, USA
| | - H Bernhard Schlegel
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA.
| | - Marciela Scarpellini
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-611, Brazil.
| | - Cláudio N Verani
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI 48202, USA.
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Humayun M, Ullah H, Hu C, Tian M, Pi W, Zhang Y, Luo W, Wang C. Enhanced Photocatalytic H 2 Evolution Performance of the Type-II FeTPPCl/Porous g-C 3N 4 Heterojunction: Experimental and Density Functional Theory Studies. ACS Appl Mater Interfaces 2023. [PMID: 36892209 DOI: 10.1021/acsami.3c01683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
It is of great significance to improve the photocatalytic performance of g-C3N4 by promoting its surface-active sites and engineering more suitable and stable redox couples. Herein, first of all, we fabricated porous g-C3N4 (PCN) via the sulfuric acid-assisted chemical exfoliation method. Then, we modified the porous g-C3N4 with iron(III) meso-tetraphenylporphine chloride (FeTPPCl) porphyrin via the wet-chemical method. The as-fabricated FeTPPCl-PCN composite revealed exceptional performance for photocatalytic water reduction by evolving 253.36 and 8301 μmol g-1 of H2 after visible and UV-visible irradiation for 4 h, respectively. The performance of the FeTPPCl-PCN composite is ∼2.45 and 4.75-fold improved compared to that of the pristine PCN photocatalyst under the same experimental conditions. The calculated quantum efficiencies of the FeTPPCl-PCN composite for H2 evolution at 365 and 420 nm wavelengths are 4.81 and 2.68%, respectively. This exceptional H2 evolution performance is because of improved surface-active sites due to porous architecture and remarkably improved charge carrier separation via the well-aligned type-II band heterostructure. Besides, we also reported the correct theoretical model of our catalyst through density functional theory (DFT) simulations. It is found that the hydrogen evolution reaction (HER) activity of FeTPPCl-PCN arises from the electron transfer from PCN via Cl atom(s) to Fe of the FeTPPCl, which forms a strong electrostatic interaction, leading to a decreased local work function on the surface of the catalyst. We suggest that the resultant composite would be a perfect model for the design and fabrication of high-efficiency heterostructure photocatalysts for energy applications.
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Affiliation(s)
- Muhammad Humayun
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Habib Ullah
- Department of Renewable Energy, Faculty of Environment, Science and Economy, University of Exeter, Penryn Campus, Cornwall TR10 9FE, United Kingdom
- Department of Engineering, Faculty of Environment, Science and Economy, University of Exeter, Exeter EX4 4QF, United Kingdom
| | - Chao Hu
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
- School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430073, China
| | - Mi Tian
- Department of Engineering, Faculty of Environment, Science and Economy, University of Exeter, Exeter EX4 4QF, United Kingdom
| | - Wenbo Pi
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Yi Zhang
- School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430073, China
| | - Wei Luo
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Chundong Wang
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Engineering Research Center for Functional Ceramics of the Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
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3
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Daniels KA, Modrow K, Osburn WN, Taylor TM. Reducing Pathogenic Escherichia coli Surrogates on Fresh Beef Cuts by Water-Reducing Antimicrobial Interventions. J Food Prot 2021; 84:281-285. [PMID: 33003191 DOI: 10.4315/jfp-20-282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 09/22/2020] [Indexed: 11/11/2022]
Abstract
ABSTRACT Water use for antimicrobial intervention application for beef harvest has come under increased scrutiny in recent years in an effort to enhance water conservation during beef harvest and fabrication. We determined the efficacy of beef safety interventions for reducing surrogates of the Shiga toxin-producing Escherichia coli (STEC) on beef cuts while lowering intervention-purposed water use for a small or very small beef establishment. Beef briskets, shoulder/clods, and rounds were inoculated with a gelatin-based slurry containing 6.8 ± 0.3 log CFU/g of nonpathogenic E. coli. After 30 min of attachment, inoculated cuts were treated by conventional lactic acid spray (2.5%, 55°C), lactic acid delivered by an electrostatic spray (2.5%, 55°C) handheld wand, hot water spray (82°C), or recycled hot water spray (82°C), wherein previously applied hot water was collected, thermally pasteurized to 82°C, or left untreated. One hundred milliliters of each treatment was sprayed onto marked surfaces of inoculated cuts, after which time surviving surrogate E. coli were enumerated. Lactic acid spray and electrostatic spray treatments produced greater reductions (1.0 to 1.1 log CFU/300 cm2) than hot water interventions (0.3 to 0.5 log CFU/300 cm2) (P ≤ 0.0001). Recycling of water reduced water losses by no less than 45% on recycled hot water spray-treated beef cuts. Low water beef safety interventions offer small and very small inspected beef establishments opportunities to incrementally reduce water use during intervention application, but not necessarily without loss of pathogen reduction efficacy. HIGHLIGHTS
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Affiliation(s)
- Kourtney A Daniels
- Department of Food Science and Technology, Texas A&M AgriLife, College Station, Texas 77843-2253
| | - Katherine Modrow
- Department of Animal Science, Texas A&M AgriLife, College Station, Texas 77843-2471, USA
| | - Wesley N Osburn
- Department of Animal Science, Texas A&M AgriLife, College Station, Texas 77843-2471, USA
| | - T Matthew Taylor
- Department of Animal Science, Texas A&M AgriLife, College Station, Texas 77843-2471, USA.,(ORCID: https://orcid.org/0000-0003-4191-5285 [T.M.T.])
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Pothakos V, Debeer N, Debonne I, Rodriguez A, Starr JN, Anderson T. Fermentation Titer Optimization and Impact on Energy and Water Consumption during Downstream Processing. Chem Eng Technol 2019; 41:2358-2365. [PMID: 31007402 PMCID: PMC6472596 DOI: 10.1002/ceat.201800279] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 08/30/2018] [Accepted: 09/07/2018] [Indexed: 01/02/2023]
Abstract
A common focus of fermentation process optimization is the product titer. Different strategies to boost fermentation titer target whole‐cell biocatalyst selection, process control, and medium composition. Working at higher product concentrations reduces the water that needs to be removed in the case of aqueous systems and, therefore, lowers the cost of downstream separation and purification. Different approaches to achieve higher titer in fermentation are examined. Energy and water consumption data collected from different Cargill fermentation plants, i.e., ethanol, lactic acid, and 2‐keto‐L‐gulonic acid, confirm that improvements in fermentation titer play a decisive role in downstream economics and environmental footprint.
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Affiliation(s)
| | - Nadine Debeer
- Cargill R&D Centre Europe BVBA Havenstraat 84 1800 Vilvoorde Belgium
| | - Ignace Debonne
- Cargill R&D Centre Europe BVBA Havenstraat 84 1800 Vilvoorde Belgium
| | - Asier Rodriguez
- Cargill R&D Centre Europe BVBA Havenstraat 84 1800 Vilvoorde Belgium
| | - John N Starr
- Engineering R&D, Cargill, Inc P.O. Box 9300 MN 55440 Minneapolis USA
| | - Todd Anderson
- Cargill R&D Centre Europe BVBA Havenstraat 84 1800 Vilvoorde Belgium
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Keswani M, Raghavan S, Deymier P. Electrochemical investigations of stable cavitation from bubbles generated during reduction of water. Ultrason Sonochem 2014; 21:1893-1899. [PMID: 24798227 DOI: 10.1016/j.ultsonch.2014.04.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2012] [Revised: 04/16/2014] [Accepted: 04/16/2014] [Indexed: 06/03/2023]
Abstract
Megasonic cleaning is traditionally used for removal of particles from wafer surfaces in semiconductor industry. With the advancement of technology node, the major challenge associated with megasonic cleaning is to be able to achieve high cleaning efficiency without causing damage to fragile features. In this paper, a method based on electrochemistry has been developed that allows controlled formation and growth of a hydrogen bubbles close to a solid surface immersed in an aqueous solution irradiated with ∼1 MHz sound field. It has been shown that significant microstreaming from resonating size bubble can be induced by proper choice of transducer duty cycle. This method has the potential to significantly improve the performance of megasonic cleaning technology through generation of local microstreaming, interfacial and pressure gradient forces in close vicinity of conductive surfaces on wafers without affecting the transient cavitation responsible for feature damage.
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Affiliation(s)
- M Keswani
- Department of Materials Science and Engineering, The University of Arizona, 1235 E James E Rogers Way, Tucson, AZ 85721, USA.
| | - S Raghavan
- Department of Materials Science and Engineering, The University of Arizona, 1235 E James E Rogers Way, Tucson, AZ 85721, USA
| | - P Deymier
- Department of Materials Science and Engineering, The University of Arizona, 1235 E James E Rogers Way, Tucson, AZ 85721, USA
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Eckenhoff WT, McNamara WR, Du P, Eisenberg R. Cobalt complexes as artificial hydrogenases for the reductive side of water splitting. Biochim Biophys Acta 2013; 1827:958-73. [PMID: 23689026 DOI: 10.1016/j.bbabio.2013.05.003] [Citation(s) in RCA: 133] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 04/19/2013] [Accepted: 05/09/2013] [Indexed: 10/26/2022]
Abstract
The generation of H2 from protons and electrons by complexes of cobalt has an extensive history. During the past decade, interest in this subject has increased as a result of developments in hydrogen generation that are driven electrochemically or photochemically. This article reviews the subject of hydrogen generation using Co complexes as catalysts and discusses the mechanistic implications of the systems studied for making H2. This article is part of a Special Issue entitled: Metals in Bioenergetics and Biomimetics Systems.
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