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Phanthuwongpakdee J, Babel S. Unraveling the mechanism of iodate adsorption by anthocyanin-rich fruit waste as green adsorbents for Applications of radioactive iodine remediation in water environment. ENVIRONMENTAL RESEARCH 2024; 250:118502. [PMID: 38365049 DOI: 10.1016/j.envres.2024.118502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 02/12/2024] [Accepted: 02/14/2024] [Indexed: 02/18/2024]
Abstract
In aquatic settings, radioactive iodine from nuclear waste can exist as iodate (IO3-). This study explored the efficiency and mechanism of IO3- adsorption by minimally modified anthocyanin-based adsorbents. Pomegranate peels and mangosteen pericarps were selected from an initial screening test and could remove over 70% of 10 mg/L IO3-. The adsorbents yielded adsorption capacity (q) of 9.59 mg/g and 2.31 mg/g, respectively, at room temperature. At 5 °C, q values increased to 14.5 and 5.13 mg/g, respectively. Pomegranate peels showed superior performance, with approximately 4 times the anthocyanin content of mangosteen pericarps. Both adsorbents took 120 min to reach adsorption equilibrium, and no desorption was observed after 8 days (I-131 half-time). Confirmation of physisorption was indicated by the fit of the pseudo-first-order reaction model, negative entropy (exothermic), and negative activation energy (Arrhenius equation). IO3- inclusion was confirmed through adsorbent surface modifications in scanning electron microscope images, the increased iodine content post-adsorption in energy-dispersive X-ray spectroscopy analysis, and alterations in peaks corresponding to anthocyanin-related functional groups in Fourier transform infrared spectroscopy analysis. X-ray absorption near-edge spectroscopy at 4564.54 eV showed that iodine was retained in the form of IO3-. Through the computational analysis, electrostatic forces, hydrogen bonds, and π-halogen interactions were deduced as mechanisms of IO3- adsorption by anthocyanin-based adsorbents. Anthocyanin-rich fruit wastes emerged as sustainable materials for eliminating IO3- from water.
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Affiliation(s)
- Jakkapon Phanthuwongpakdee
- Faculty of Environment and Resource Studies, Mahidol University, 999 Phutthamonthon Sai 4 Road, Salaya, Phutthamonthon District, Nakhon Pathom 73170, Thailand
| | - Sandhya Babel
- School of Bio-Chemical Engineering and Technology, Sirindhorn International Institute of Technology (SIIT), Thammasat University, P.O Box 22, Pathum Thani 12121, Thailand.
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Prophet AM, Polley K, Van Berkel GJ, Limmer DT, Wilson KR. Iodide oxidation by ozone at the surface of aqueous microdroplets. Chem Sci 2024; 15:736-756. [PMID: 38179528 PMCID: PMC10762724 DOI: 10.1039/d3sc04254e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Accepted: 12/03/2023] [Indexed: 01/06/2024] Open
Abstract
The oxidation of iodide by ozone occurs at the sea-surface and within sea spray aerosol, influencing the overall ozone budget in the marine boundary layer and leading to the emission of reactive halogen gases. A detailed account of the surface mechanism has proven elusive, however, due to the difficulty in quantifying multiphase kinetics. To obtain a clearer understanding of this reaction mechanism at the air-water interface, we report pH-dependent oxidation kinetics of I- in single levitated microdroplets as a function of [O3] using a quadrupole electrodynamic trap and an open port sampling interface for mass spectrometry. A kinetic model, constrained by molecular simulations of O3 dynamics at the air-water interface, is used to understand the coupled diffusive, reactive, and evaporative pathways at the microdroplet surface, which exhibit a strong dependence on bulk solution pH. Under acidic conditions, the surface reaction is limited by O3 diffusion in the gas phase, whereas under basic conditions the reaction becomes rate limited on the surface. The pH dependence also suggests the existence of a reactive intermediate IOOO- as has previously been observed in the Br- + O3 reaction. Expressions for steady-state surface concentrations of reactants are derived and utilized to directly compute uptake coefficients for this system, allowing for an exploration of uptake dependence on reactant concentration. In the present experiments, reactive uptake coefficients of O3 scale weakly with bulk solution pH, increasing from 4 × 10-4 to 2 × 10-3 with decreasing solution pH from pH 13 to pH 3.
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Affiliation(s)
- Alexander M Prophet
- Chemical Sciences Division, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- Department of Chemistry, University of California Berkeley CA 94720 USA
| | - Kritanjan Polley
- Chemical Sciences Division, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- Department of Chemistry, University of California Berkeley CA 94720 USA
| | | | - David T Limmer
- Chemical Sciences Division, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- Department of Chemistry, University of California Berkeley CA 94720 USA
- Materials Science Division, Lawrence Berkeley National Laboratory Berkeley California 94720 USA
- Kavli Energy NanoScience Institute Berkeley California 94720 USA
| | - Kevin R Wilson
- Chemical Sciences Division, Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
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Mokhtarizad A, Amiri P, Behin J. Ozonation/UV irradiation of dispersed Ag/AgI nanoparticles in water resources: stability and aggregation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:23192-23212. [PMID: 36318409 DOI: 10.1007/s11356-022-23812-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Proliferation of nanoparticles (NPs) as aqueous pollutants is a matter of growing concern today. The aggregation kinetics of colloidal bare silver (Ag, 20.5 nm) and silver iodide (AgI, 15.3 nm) NPs were investigated during ozone/ultraviolet (O3/UV) oxidation. Dynamic light scattering was applied to monitor the aggregation of NPs, and the z-average of treated samples was considered aggregate diameter. The effect of temperature, pH, and initial concentration of NPs was investigated on the aggregation rate constant and stability ratio. At a short oxidation period of approximately 1 min, the lower stability ratio was achieved for Ag NPs (< 50) than AgI NPs (> 100). Under acidic conditions, the negative surface charge of both NPs was neutralized that resulted in faster aggregation. In contrast, the impact of temperature and initial concentration of NPs on the aggregation rate was different for both NPs, which was due to the type of O3/UV interaction with the surface of NPs and the thickness of the electrical double layer surrounding the NPs. The aggregation behavior of Ag NPs obeyed diffusion-limited regime, while an intermediate regime between diffusion- and reaction-limited was observed for AgI NP aggregation. The resulting aggregate morphologies showed that the clusters were ramified for Ag and compressed for AgI NPs. Applying the O3/UV oxidation process for water treatment purposes leads to a significant reduction in aggregation time for inherently unstable Ag and stable AgI toxic NPs from several hours or days to several minutes.
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Affiliation(s)
- Atefeh Mokhtarizad
- Faculty of Petroleum and Chemical Engineering, Razi University, Kermanshah, Iran
| | - Pegah Amiri
- Faculty of Petroleum and Chemical Engineering, Razi University, Kermanshah, Iran
| | - Jamshid Behin
- Faculty of Petroleum and Chemical Engineering, Razi University, Kermanshah, Iran.
- Artificial Intelligence Division, Advanced Chemical Engineering Research Center, Razi University, Kermanshah, Iran.
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He P, Pang H, Yang Z, Li S, Huang Y, Hou X, Possnert G, Zheng X, Pei X, Aldahan A. 127I and 129I species in the English Channel and its adjacent areas: Uncovering impact on the isotopes marine pathways. WATER RESEARCH 2022; 225:119178. [PMID: 36219893 DOI: 10.1016/j.watres.2022.119178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 09/13/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
Radioactive iodine-129 has been released from the La Hague nuclear fuel reprocessing facility (NRF) into the English Channel, but the distribution and transformation of the isotope species, and environmental consequences have not been fully characterized in the Channel. Here we present data on iodine isotopes (129I and 127I) species in surface water of the English Channel and the southern Celtic Sea. Compared to 127I species, the concentrations of 129I- and 129IO3- show more variations, but iodate is the major species for both 129I and 127I. Our data provide new information regarding iodide-iodate inter-conversion showing that water dilution and mixing are the main factors affecting the 127I and 129I species distribution in the Channel. Some reduction of iodate occurs within the English Channel and mainly in the west part because of biotic processes. The 129I species transformation is overall insignificant, especially in the eastern Channel, where a constant value of 129IO3-/129I is observed, which might characterize the La Hague wastewater signal. In the Celtic Sea, oxidation of iodide can be traced by 127I and 129I species. On a larger scale, 129I generally experienced an oxidation process in the Atlantic Ocean, while in the coast of shallow shelf seas, new produced 129I- can be identified, especially in the German Bight and the Baltic Sea. The data of 129I species in the English Channel can provide estimate of redox rates in a much broader marine areas if the transit time of 129I from La Hague is well-defined. Furthermore, estimate of inventories for 129I and its species in the Channel, and fluxes of 129I species from the English Channel to the North Sea add important information to the geochemical cycle of 129I.
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Affiliation(s)
- Peng He
- School of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China.
| | - Hongying Pang
- School of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China
| | - Zheng Yang
- School of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China
| | - Sihong Li
- School of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China
| | - Yi Huang
- School of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
| | - Xiaolin Hou
- Department of Environmental and Resource Engineering, Technical University of Denmark, Risø Campus, DK-4000 Roskilde, Denmark; State Key Laboratory of Loess and Quaternary Geology, Xi'an AMS Center, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
| | - Göran Possnert
- Tandem Laboratory, Uppsala University, PO Box 529, 75120 Uppsala, Sweden
| | - Xuefeng Zheng
- Sichuan Jinmei Environmental Protection Co., Ltd., Chengdu, China
| | - Xiangjun Pei
- School of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
| | - Ala Aldahan
- Department of Geosciences, United Arab Emirates University, P.O Box 15551, Al Ain, UAE.
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Wilson KR, Prophet AM, Willis MD. A Kinetic Model for Predicting Trace Gas Uptake and Reaction. J Phys Chem A 2022; 126:7291-7308. [PMID: 36170058 DOI: 10.1021/acs.jpca.2c03559] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A model is developed to describe trace gas uptake and reaction with applications to aerosols and microdroplets. Gas uptake by the liquid is formulated as a coupled equilibria that links gas, surface, and bulk regions of the droplet or solution. Previously, this framework was used in explicit stochastic reaction-diffusion simulations to predict the reactive uptake kinetics of ozone with droplets containing aqueous aconitic acid, maleic acid, and sodium nitrite. With the use of prior data and simulation results, a new equation for the uptake coefficient is derived, which accounts for both surface and bulk reactions. Lambert W functions are used to obtain closed form solutions to the integrated rate laws for the multiphase kinetics; similar to previous expressions that describe Michaelis-Menten enzyme kinetics. Together these equations couple interface and bulk processes over a wide range of conditions and do not require many of the limiting assumptions needed to apply resistor model formulations to explain trace gas uptake and reaction.
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Affiliation(s)
- Kevin R Wilson
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Alexander M Prophet
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.,Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Megan D Willis
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523 United States
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Pedersen HB, Elm J, Frederiksen CH, Jessen SPS, Teiwes R, Bilde M. The reaction of isotope-substituted hydrated iodide I(H182O) − with ozone: the reactive influence of the solvent water molecule. Phys Chem Chem Phys 2020; 22:19080-19088. [DOI: 10.1039/d0cp03219k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report an investigation of the reaction of isotope-substituted hydrated iodide I(H182O)− with ozone 16O3 to examine the involvement of the water molecules in the oxidation reactions that terminate with the formation of IO3−.
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Affiliation(s)
- Henrik B. Pedersen
- Department of Physics and Astronomy
- Aarhus University
- DK-8000 Aarhus C
- Denmark
| | - Jonas Elm
- Department of Chemistry
- Aarhus University
- DK-8000 Aarhus C
- Denmark
| | | | - Simon P. S. Jessen
- Department of Physics and Astronomy
- Aarhus University
- DK-8000 Aarhus C
- Denmark
| | - Ricky Teiwes
- Department of Physics and Astronomy
- Aarhus University
- DK-8000 Aarhus C
- Denmark
| | - Merete Bilde
- Department of Chemistry
- Aarhus University
- DK-8000 Aarhus C
- Denmark
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