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André E, Cornu D, Pérez Ramírez L, Durand P, Gallet JJ, Bournel F, Rochet F, Ruby C, Carteret C, Coustel R. The dehydration mechanism of Na and K birnessites: a comprehensive multitechnique study. Dalton Trans 2024; 53:9952-9963. [PMID: 38809151 DOI: 10.1039/d4dt00588k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
The structural, spectroscopic and electronic properties of Na and K birnessites were investigated from ambient conditions (birA) to complete dehydration, and the involved mechanisms were scrutinized. Density Functional Theory (DFT) simulations were employed to derive structural models for lamellar A0.33MnO2·xH2O (A = Na+ or K+, x = 0 or 0.66), subsequently compared with the experimental results obtained for Na0.30MnO2·0.75H2O and K0.22MnO2·0.77H2O materials. Thermal analysis (TGA-DSC), X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, and Near Ambient Pressure X-ray Photoemission Spectroscopy (NAP-XPS) measurements were conducted for both birnessites. Dehydration under vacuum, annealing, or controlled relative humidity were considered. Results indicated that complete birnessite dehydration was a two-stage process. In the first stage, water removal from the interlayer of fully hydrated birnessite (birA) down to a molar H2O/A ratio of ∼2 (birB) led to the progressive shrinkage of the interlayer distance (3% for Na birnessite, 1% for K birnessite). In the second stage, water-free (birC) domains with a shorter interlayer distance (20% for Na birnessite, 10% for K birnessite) appeared and coexisted with birB domains. Then, birB was essentially transformed into birC when complete dehydration was achieved. The vibrational properties of birA were consistent with strong intermolecular interactions among water molecules, whereas partially dehydrated birnessite (birB) showed a distinct feature, with 3 (for Na-bir) and 2 (for K-bir) vibrations that were reproduced by DFT calculations for organized water into the interlayer (x = 0.66). The study also demonstrated that the electronic structure of Na birnessite depends on the interlayer water content. The external Na+ electronic level (Na 2p) was slightly destabilized (+0.3 eV binding energy) under near ambient conditions (birA) compared to drier conditions (birB and birC).
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Affiliation(s)
- E André
- Université de Lorraine, CNRS, LCPME, F-54000 Nancy, France
| | - D Cornu
- Université de Lorraine, CNRS, LCPME, F-54000 Nancy, France
| | - L Pérez Ramírez
- Sorbonne Université, CNRS (UMR 7614), Laboratoire de Chimie Physique Matière et Rayonnement, 75252 Paris Cedex 05, France
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - P Durand
- Université de Lorraine, CNRS, CRM2, F-54000 Nancy, France
| | - J-J Gallet
- Sorbonne Université, CNRS (UMR 7614), Laboratoire de Chimie Physique Matière et Rayonnement, 75252 Paris Cedex 05, France
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - F Bournel
- Sorbonne Université, CNRS (UMR 7614), Laboratoire de Chimie Physique Matière et Rayonnement, 75252 Paris Cedex 05, France
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - F Rochet
- Sorbonne Université, CNRS (UMR 7614), Laboratoire de Chimie Physique Matière et Rayonnement, 75252 Paris Cedex 05, France
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Gif-sur-Yvette, France
| | - C Ruby
- Université de Lorraine, CNRS, LCPME, F-54000 Nancy, France
| | - C Carteret
- Université de Lorraine, CNRS, LCPME, F-54000 Nancy, France
| | - R Coustel
- Université de Lorraine, CNRS, LCPME, F-54000 Nancy, France
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Huang T, Pan L, Dong J, Zhou L, Tao H, Zhang SW, Li A. A comprehensive investigation of zeolite-rich tuff functionalized with 3-mercaptopropionic acid intercalated green rust for the efficient removal of Hg II and Cr VI in a binary system. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 324:116344. [PMID: 36166867 DOI: 10.1016/j.jenvman.2022.116344] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/27/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023]
Abstract
In this study, the 3-mercaptopropionic acid (MA) was chosen to achieve the anionic intercalation into the green rust (GR) materials (MA-GR). The zeolite-rich tuff functionalized with the MA-intercalated GR (MA-GR-tuff) was subsequently synthesized and used to remove both HgII cations and CrVI anions in a binary system. MA-GR-tuff showed the best adsorption capacities to both HgII and CrVI among the adsorbent materials. The optimal combination of parameters was determined as the molar ratio of FeII to FeIII of 3.5, the molar ratio of OH- to the total iron of 3.75, the molar ratio of MA to the total iron of 2.5, and the mass ratio of the total iron to the tuff of 1.25. The pseudo-first-order kinetic model was appropriate in describing the kinetic sorption of CrVI by MA-GR-tuff. Both the pseudo-first-order kinetic model and Elovich were suitable for explaining HgII sorption. The maximum monolayer adsorption capacities of MA-GR-tuff towards CrVI and HgII were 185.19 mg/g and 72.99 mg/g, respectively. More flocs and plumes were formed in the MA-GR while the intercalation and more pores and crevices of different sizes were found in the MA-GR-tuff. Sulfhydryl complexation and the molecular sieve of tuff obviously both played a role in influencing the adsorption process. This study directly overcomes the drawback brought by the natural tuff to the treatment of a cationic-and-anionic binary system and supplies a new kind of tuff-based adsorbent for the potential use for the remediation of HM-contaminated wastewater.
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Affiliation(s)
- Tao Huang
- School of Materials Engineering, Changshu Institute of Technology, 215500, China; Suzhou Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu, 215500, China; School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China.
| | - Longwei Pan
- School of Materials Engineering, Changshu Institute of Technology, 215500, China.
| | - Jincheng Dong
- Suzhou Kunshan Environmental Monitoring Station, 215300, China
| | - Lulu Zhou
- School of Materials Engineering, Changshu Institute of Technology, 215500, China
| | - Hui Tao
- Chongqing Water Affairs Group Co., Ltd., No. 1, Longjiawan, Yuzhong District, Chongqing, 400000, China
| | - Shu-Wen Zhang
- School of Resource Environmental and Safety Engineering, University of South China, 421001, China
| | - Aiyin Li
- School of Materials Engineering, Changshu Institute of Technology, 215500, China
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Special Issue: Layered Double Hydroxides (LDH) and LDH-Based Hybrid Composites. MATERIALS 2021; 14:ma14102582. [PMID: 34065639 PMCID: PMC8155911 DOI: 10.3390/ma14102582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 05/13/2021] [Accepted: 05/14/2021] [Indexed: 11/16/2022]
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