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Mulkapuri S, Siddikha A, Ravi A, Saha P, Kumar AV, Boodida S, Vithal M, Das SK. Electrocatalytic Hydrogen Evolution by a Uranium(VI) Polyoxometalate: an Environmental Toxin for Sustainable Energy Generation. Inorg Chem 2023; 62:19664-19676. [PMID: 37967464 DOI: 10.1021/acs.inorgchem.3c03018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2023]
Abstract
The uranyl ion (UO2)2+, a uranium nuclear waste, is one of the serious contaminants in our ecosystem because of its radioactivity, relevant human activities, and highly mobile and complex nature of living cells. In this article, we have reported the synthesis and structural characterization of an uranyl cation-incorporated polyoxometalate (POM) compound, K10[{K4(H2O)6}{UO2}2(α-PW9O34)2]·13H2O (1), in which the uranyl cations are complexed with an in situ generated [α-PW9O34]9- cluster. Single-crystal X-ray diffraction (SCXRD) analysis of compound 1 reveals that the uranyl-potassium complex cationic species, [{K4(H2O)6}{UO2}2]8+, is sandwiched by two [α-PW9O34]9- clusters resulting in a Dawson type of POM. Compound 1 was further characterized by inductively coupled plasma optical emission spectroscopy (ICP-OES) analysis and infrared (IR), Raman, electronic absorption, and solid-state photoluminescence spectral studies. IR stretching vibrations at 895 and 856 cm-1 and the Raman signature peak at 792 cm-1 in the IR and Raman spectra of compound 1 primarily confirm the presence of a trans-[O═U═O]2+ ion. The solid-state photoluminescence spectrum of 1 exhibits a typical vibronic structure, resulting from symmetrical vibrations of [O═U═O]2+ bands, corresponding to the electronic transitions of S11 → S10 and S10 → S0υ (υ = 0-3). Interestingly, title compound 1 shows efficient electrocatalytic hydrogen evolution by water reduction with low Tafel slope values of 186.59 and 114.83 mV dec-1 at 1 mA cm-2 along with optimal Faradaic efficiency values of 82 and 87% at neutral pH and in acidic pH 3, respectively. Detailed electrochemical analyses reveal that the catalytic hydrogen evolution reaction (HER) activity mediated by compound 1 is associated with the UVI/UV redox couple of the POM. The microscopic as well as routine spectral analyses of postelectrode samples and controlled experiments have confirmed that compound 1 behaves like a true molecular electrocatalyst for the HER. To our knowledge, this is the first paradigm of a uranium-containing polyoxometalate that exhibits electrocatalytic water reduction to molecular H2. In a nutshell, an environmental toxin (a uranium-oxo compound) has been demonstrated to be utilized as an efficient electrocatalyst for hydrogen generation from water, a green approach of sustainable energy production.
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Affiliation(s)
- Sateesh Mulkapuri
- School of Chemistry, University of Hyderabad, P. O. Central University, Hyderabad 500046, India
| | - Asha Siddikha
- School of Chemistry, University of Hyderabad, P. O. Central University, Hyderabad 500046, India
- Department of Chemistry, JNTUH University College of Engineering, Science and Technology, Hyderabad 500085, India
- Department of Chemistry, Osmania University, Hyderabad 500 007, India
| | - Athira Ravi
- School of Chemistry, University of Hyderabad, P. O. Central University, Hyderabad 500046, India
| | - Pinki Saha
- School of Chemistry, University of Hyderabad, P. O. Central University, Hyderabad 500046, India
| | - Avulu Vinod Kumar
- School of Chemistry, University of Hyderabad, P. O. Central University, Hyderabad 500046, India
| | - Sathyanarayana Boodida
- Department of Chemistry, JNTUH University College of Engineering, Science and Technology, Hyderabad 500085, India
| | - Muga Vithal
- Department of Chemistry, Osmania University, Hyderabad 500 007, India
| | - Samar K Das
- School of Chemistry, University of Hyderabad, P. O. Central University, Hyderabad 500046, India
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Sun Y, Lei A. Ca 2+-Facilitated Adhesion of Bacteria on the Na-Montmorillonite Surface. ACS OMEGA 2023; 8:3385-3395. [PMID: 36713719 PMCID: PMC9878658 DOI: 10.1021/acsomega.2c07260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 12/16/2022] [Indexed: 06/18/2023]
Abstract
The adhesion of bacteria on clay surfaces strongly affected their migration and distribution in soil and water. Bacterial adhesion experiments on the Na-montmorillonite (Na-MMT) surface were conducted to determine the role of Na-MMT in the bacterial adhesion process and to prove the validity of the isotherm and kinetic theory for the bacterial surface adhesion in the presence of Ca2+ ions. Batch adhesion experiments with bacteria on the Na-MMT surface were carried out with varying time frames, temperatures, bacterial concentrations, and Ca2+ ion concentrations. The adhesion capacity of Na-MMT significantly correlated with the Ca2+ ion concentration, temperature, time frame, and bacterial concentration when Ca2+ ions were present. The adhesion morphology of the bacteria onto the Na-MMT surface, observed through the zeta-potential and atomic force microscopy (AFM), additionally demonstrated that the bacterial adhesion onto the Na-MMT surface was dominated by the nonelectrostatic force.
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Affiliation(s)
- Yongshuai Sun
- College
of Water Resources & Civil Engineering, China Agricultural University, Beijing100083, China
| | - Anping Lei
- China
Highway Engineering Consultants Corporation, Beijing100089, China
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Samuel MS, Shang M, Klimchuk S, Niu J. Novel Regenerative Hybrid Composite Adsorbent with Improved Removal Capacity for Lead Ions in Water. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.0c06277] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Melvin S. Samuel
- Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, United States
| | - Mingwei Shang
- Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, United States
| | - Stanislav Klimchuk
- Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, United States
| | - Junjie Niu
- Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, United States
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Li M, He L, Zhang X, Rong H, Tong M. Different surface charged plastic particles have different cotransport behaviors with kaolinite ☆particles in porous media. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 267:115534. [PMID: 33254596 DOI: 10.1016/j.envpol.2020.115534] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 08/19/2020] [Accepted: 08/24/2020] [Indexed: 06/12/2023]
Abstract
The wide utilization of plastic related products leads to the ubiquitous presence of plastic particles in natural environments. Plastic particles could interact with kaolinite (one type of typical clay particles abundant in environments) and form plastic-kaolinite heteroaggregates. The fate and transport of both plastic particles and kaolinite particles thus might be altered. The cotransport and deposition behaviors of micron-sized plastic particles (MPs) with different surface charge (both negative and positive surface charge) with kaolinite in porous media in both 5 and 25 mM NaCl solutions were investigated in present study. Both types of MPs (negatively charged carboxylate-modified MPs (CMPs) and positively charged amine-modified MPs (AMPs)) formed heteroaggregates with kaolinite particles under both solution conditions examined, however, CMPs and AMPs exhibited different cotransport behaviors with kaolinite. Specifically, the transport of both CMPs and kaolinite was increased under both ionic strength conditions when kaolinite and CMPs were copresent in suspensions. While, when kaolinite and positively charged AMPs were copresent in suspensions, negligible transport of both kaolinite and AMPs were observed under examined salt solution conditions. The competition deposition sites by kaolinite (the portion suspending in solution) with CMPs-kaolinite heteroaggregates led to the increased transport both CMPs and kaolinite when both types of colloids were copresent. In contrast, the formation of larger sized AMPs-kaolinite heteroaggregates with surface charge heterogeneity led to the negligible transport of both kaolinite and AMPs when they were copresent in suspensions. The results of this study show that when plastic particles and kaolinite particles are copresent in natural environments, their interaction with each other will affect their transport behaviors in porous media. The alteration in the transport of MPs or kaolinite (either increased or decreased transport) is highly correlated with the surface charge of MPs.
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Affiliation(s)
- Meng Li
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Lei He
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Xiangwei Zhang
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Haifeng Rong
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China
| | - Meiping Tong
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China.
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Zhong D, Zhao Z, Jiang Y, Yang X, Wang L, Chen J, Guan CY, Zhang Y, Tsang DCW, Crittenden JC. Contrasting abiotic As(III) immobilization by undissolved and dissolved fractions of biochar in Ca 2+-rich groundwater under anoxic conditions. WATER RESEARCH 2020; 183:116106. [PMID: 32771717 DOI: 10.1016/j.watres.2020.116106] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 06/10/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
Engineered black carbon (biochar) can be introduced into groundwater through its extensive engineered applications (e.g., in-situ remediation of groundwater/soils), which can participate in geochemical processes that may alter the fate of trace contaminants such as arsenic (As(III)). Here we examined the impacts of the undissolved and dissolved fractions of reduced biochar (hereafter denoted as rUBC and rDBC, respectively) on the As(III) immobilization in the absence/presence of Ca2+ (50 mM) at pH 11.5 under anoxic conditions. While neither rUBC nor rDBC alone was capable of immobilizing As(III), the apparent As(III) immobilization by rUBC and rDBC synergistically occurred in the presence of Ca2+, with an efficiency of 73.1% and 89.6% within 24 h, respectively. In the rUBC/Ca2+/As(III) system, rUBC enabled full oxidation of As(III) to As(V) by its residual redox-active moieties such as quinoid CO and persistent free radicals, thereby facilitating precipitation of the newly generated As(V) with Ca2+ adsorbed onto the rUBC's surface. In contrast, rDBC induced in-situ local enrichment of Ca2+ in the nascent rDBC-derived flocs with predominant non-oxidative and slight oxidative precipitation of As(III) via ternary rDBC-Ca-As complexation. This ternary complex was created by Ca2+-bridging interactions between As species and oxygen-containing functional groups of rDBC, as evidenced by the FTIR results and the Ca2+-impeded As(III) oxidation. The generation of the flocs physically trapped a small amount of As species particularly As(III). Both the increases in Ca2+ concentration (0-100 mM) and solution pH (10.0-12.5) enhanced the apparent As(III) immobilization. This study provides new insights into the environmental impacts of two reduced biochar fractions released into typical Ca2+-rich aquifers on the fate and transport of As species.
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Affiliation(s)
- Delai Zhong
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Zezhou Zhao
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Yi Jiang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Xiao Yang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; Korea Biochar Research Center, Division of Environmental Science and Ecological Engineering, Korea University, South Korea
| | - Linling Wang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Jing Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Chung-Yu Guan
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, 106, Taiwan
| | - Yanrong Zhang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - John C Crittenden
- Brook Byers Institute of Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States
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Sadergaski LR, Perry SN, Tholen LR, Hixon AE. Evidence for non-electrostatic interactions between a pyrophosphate-functionalized uranyl peroxide nanocluster and iron (hydr)oxide minerals. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2019; 21:1174-1183. [PMID: 31187835 DOI: 10.1039/c9em00139e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The terminal oxygen atoms of the pyrophosphate groups in the uranyl peroxide nanocluster U24Pp12 ([(UO2)24(O2)24(P2O7)12]48-) are not fully satisfied by bond valence considerations and can become protonated. This functionality could allow for specific interactions with mineral surfaces, as opposed to the electrostatically-driven interactions observed between non-functionalized uranyl peroxide nanoclusters and mineral surfaces. The sorption of U24Pp12 to goethite and hematite was studied using batch sorption experiments as a function of U24Pp12 concentration, mineral concentration, and pH. A suite of spectroscopic techniques, scanning electron microscopy, and electrophoretic mobility measurements were used to examine the minerals before and after reaction with U24Pp12, leading to a proposed conceptual model for U24Pp12 interactions with goethite. The governing rate laws were determined and compared to those previously determined for a non-functionalized uranyl peroxide nanocluster. The rate of uranyl peroxide nanocluster sorption depends on the charge density and functionalized component of the uranyl peroxide cage. Electrophoretic mobility and attenuated total reflectance Fourier transform infrared spectroscopy analyses show that an inner-sphere complex forms between the U24Pp12 cluster and the goethite surface through the terminal pyrophosphate groups, leading to a proposed conceptual model in which U24Pp12 interacts with the triply-coordinated reactive sites on the (110) plane of goethite. These results demonstrate that the behavior of U24Pp12 at the iron (hydr)oxide-water interface is unique relative to interactions of the uranyl ion and non-functionalized uranyl peroxide nanoclusters.
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Affiliation(s)
- Luke R Sadergaski
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, IN 46556, USA.
| | - Samuel N Perry
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, IN 46556, USA.
| | - Luke R Tholen
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, IN 46556, USA.
| | - Amy E Hixon
- Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, IN 46556, USA.
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