Characterization of Ni-rich hexagonal birnessite and its geochemical effects on aqueous Pb2+/Zn2+ and As(III)

Yin, Hui; Tan, Wenfeng; Zheng, Lirong; Cui, Hao‐Jie; Qiu, Guohong; Fan, Louzhen; Feng, Xionghan

doi:10.1016/j.gca.2012.05.039

Cited by 87 publications

(104 citation statements)

References 70 publications

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“…Powder XRD Fig. 1 presents the powder XRD results of Co-doped birnessites in comparison with a typical hexagonal turbostratic birnessite sample HB from Yin et al (2012), and the theoretical calculations of birnessite varieties with random stacking faults (W r = 75%) along the c* axis with orthogonal or hexagonal layer symmetry. XRD profiles of the birnessites with orthogonal and hexagonal layer symmetries both have basal reflections such as 00 l peaks, but their different layer symmetries can be unambiguously distinguished from each other by the shape of their hk diffraction bands, i.e., the 20 l/11 l and 31 l/02 l bands .…”

Section: Results and Analysismentioning

confidence: 99%

“…The diffractometer was operated at a tube voltage of 40 kV and a current of 40 mA with 10 s counting For a better examination of the evolution of the XRD traces with Co content, the low angle region (5-30°2θ Cu Kα) of Co0 was scaled by a factor 0.04, and the high angle regions (30-90°2θ Cu Kα) of Co5, Co10, Co20 and hexagonal turbostratic birnessite HB (Yin et al, 2012) were scaled by a factor 10. (b) Theoretical calculations of birnessites with 75% random stacking faults (W r ) with orthogonal and hexagonal layer symmetry based on the model of Lanson et al (2002).…”

Section: Sample Characterizationmentioning

confidence: 99%

“…The chemical composition, SSA and XPS analyses of the samples were performed as previously described (Yin et al, 2011(Yin et al, , 2012(Yin et al, , 2013.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…The XAS spectra of the doped birnessites were measured at room temperature on the 1W1B beamline at the Beijing Synchrotron Radiation Facility (BSRF) (Yin et al, 2012(Yin et al, , 2013(Yin et al, , 2014. Fluorescence-yield Co K-edge XAS spectra were obtained over the range of 7512-8500 eV.…”

Section: X-ray Absorption Fine Structure (Xas) Spectroscopymentioning

confidence: 99%

“…The effects of TMs on the structure and properties of birnessites and the crystal chemistry characteristics of these TMs in birnessite structures are strongly dependent on the birnessite layer composition and ion types of the TMs (Peacock and Sherman, 2007b;Yin et al, 2012Yin et al, , 2013Manceau et al, 2014). When adsorbed on hexagonal birnessite, Co 2+ is quickly oxidized to Co 3+ and most Co 3+ migrates into the layers (Co E ), with the remaining portion adsorbed on vacancies as triple corner-sharing complexes (Co TC ) Yu et al, 2012;Kwon et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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High Co-doping promotes the transition of birnessite layer symmetry from orthogonal to hexagonal

et al. 2015

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Section: Results and Analysismentioning

confidence: 99%

Section: Sample Characterizationmentioning

confidence: 99%

“…The chemical composition, SSA and XPS analyses of the samples were performed as previously described (Yin et al, 2011(Yin et al, , 2012(Yin et al, , 2013.…”

Section: Sample Characterizationmentioning

confidence: 99%

Section: X-ray Absorption Fine Structure (Xas) Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Co-doping promotes the transition of birnessite layer symmetry from orthogonal to hexagonal

et al. 2015

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Catalytic Process Optimization of Birnessite‐based Fenton‐like Reaction with Surface Cu²⁺ Modification

Zang

Jin

et al. 2018

ChemCatChem

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Layer-structured birnessite (d-MnO 2 ) has been applied recently in the heterogeneous Fenton-like process. However, easy deactivation and low utilization efficiency of H 2 O 2 limit its practical application. The catalytic processes of H 2 O 2 on birnessite were successfully regulated via surface chemical modification as Cu 2 + ions were intercalated into the birnessite by the ion-exchange method (CuBir). The triple-corner-sharing inner-sphere surface complexes of Cu 2 + ions (TCS species) formed above Mn vacancies could effectively weaken the over-complexation of H 2 O 2 on the surface of [MnO 6 ] sheets, and then decrease the self-consumption of surface-formed superoxide radicals. The surface TCS species have excellent Fenton-like performances and enhance the conversion efficiency of H 2 O 2 into reactive oxygen species (ROS). Moreover, the surface Cu 2 + -modification engineering could prevent deactivation owing to degradation intermediate residues and improve the recyclability of catalyst.

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Effects of dry aging and heating on the structural characteristics and transformation of hexagonal turbostratic birnessite

Yin,

Zhang,

Xiang

et al. 2024

Soil Science Soc of Amer J

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Natural birnessite‐like minerals are commonly enriched in various transition metals (TMs), such as Fe. Though the fates of metals associated with birnessites during mineral transformation in aqueous conditions are thoroughly studied, we determined the Fe behaviors in Fe‐doped hexagonal turbostratic birnessites during mineral evolution in dry state at room temperature for 8 years and upon thermal treatments at temperatures ranging from 323–773 K covering the temperatures in extreme environments such as under wildfires. These Fe‐containing birnessites were very stable upon aging in the dry state. Upon thermal treatment, the birnessite sample with a small amount of Fe (≤ 2.8 wt.%) was transformed to cryptomelane at 573–673 K while for the sample with ∼5.6 wt.% Fe the transformation temperature increased to 673–773 K. This indicated that Fe adsorption enhanced the birnessite thermal stability. Further, there was a linear relationship between the fraction of edge‐sharing Fe‐Fe(Mn) pairs and temperature over 298–473 K. This implied the migration of Fe adsorbed on vacancies into birnessite layers and/or increased edge‐sharing of Fe around vacancies from adjacent layers during heating. The average Mn valences in the Mn dioxides were almost constant with the increase of temperature when the layer structure was kept but greatly increased when the tectomanganate was formed. These results provided deep insights into the mechanisms of Mn dioxide mineral transformation and the fates of associated metals under extreme conditions in terrestrial environments. Birnessite structure kept stable during 8 years dry aging. Fe adsorption enhanced birnessite thermal stability. Heating at 298‐473 K promoted the formation of edge‐sharing Fe‐Fe(Mn) pairs in the birnessite structure. Fe‐doped birnessite was converted to cryptomelane after heating at 673‐773 K. Average Mn valences were almost constant in birnessites but were greatly increased for cryptomelanes. This article is protected by copyright. All rights reserved

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Characterization of Ni-rich hexagonal birnessite and its geochemical effects on aqueous Pb2+/Zn2+ and As(III)

Cited by 87 publications

References 70 publications

High Co-doping promotes the transition of birnessite layer symmetry from orthogonal to hexagonal

High Co-doping promotes the transition of birnessite layer symmetry from orthogonal to hexagonal

Catalytic Process Optimization of Birnessite‐based Fenton‐like Reaction with Surface Cu²⁺ Modification

Effects of dry aging and heating on the structural characteristics and transformation of hexagonal turbostratic birnessite

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Characterization of Ni-rich hexagonal birnessite and its geochemical effects on aqueous Pb2+/Zn2+ and As(III)

Cited by 87 publications

References 70 publications

High Co-doping promotes the transition of birnessite layer symmetry from orthogonal to hexagonal

High Co-doping promotes the transition of birnessite layer symmetry from orthogonal to hexagonal

Catalytic Process Optimization of Birnessite‐based Fenton‐like Reaction with Surface Cu2+ Modification

Effects of dry aging and heating on the structural characteristics and transformation of hexagonal turbostratic birnessite

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Catalytic Process Optimization of Birnessite‐based Fenton‐like Reaction with Surface Cu²⁺ Modification