Comparative studies of synthesis, structure, optical properties and conductivity of the monoclinic phases Na2Co6Mn2(PO4)6 and Na2Co6Ni2(PO4)6

Madila, Erman Eloge Nzaba; Rousselot, Steeve; Rioux, Maxime; Dollé, Mickaël; Duong, Adam

doi:10.1016/j.solidstatesciences.2021.106779

Cited by 2 publications

(2 citation statements)

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“…In addition, the peaks at 133.33 and 134.58 eV were attributed to the overlapped peaks of orthophosphate (ortho-P) and pyrophosphate (pyro-P) (Qian et al, 2014), which were widely distributed on the surface and inside of Chlorella (Kang et al, 2018), respectively. After Pb(II)/Ca(II) loaded, Frontiers in Environmental Science frontiersin.org the original peaks disappeared and a new single peak at 139 eV appeared that belongs to PO 4 3− (Nzaba Madila et al, 2022). Thus, the widely differing P chemical shifts among orthophosphate and pyrophosphate species are readily distinguishable after Pb(II)/Ca(II) is loaded.…”

Section: Xpsmentioning

confidence: 97%

“…The disappearance of the peak at 3728.53 cm −1 (Al-OH) in Figure7Ccould be also due to the ion exchange of MMT to adsorbed Ca(II)/Pb(II). The peaks at 1,047.24 and 1,044.46 cm −1 were assigned to asymmetric stretching modes of P-O bonds in (PO 4 ) 3− units(Nzaba Madila et al, 2022), shifted from 1,047.24 and 1,044.46 cm −1 to 1,047.97 and 1,040.74 cm −1 in Figures7B,Cdue to the formation of phosphate minerals, which was induced by Chlorella after Pb(II)/Ca(II) adsorption. The shifted functional groups are summarized in Supplementary Table…”

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The bio-immobilization of Pb(II) induced by the Chlorella–montmorillonite composite in the Ca(II) environment

Wang

Chen²,

Tan³

et al. 2022

Front. Environ. Sci.

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The clay–microbial consortium is ubiquitous in the soil near the mining area and plays an important role in the transport of heavy metals. In this study, Chlorella sorokiniana FK was separated from lead–zinc mine tailings. The montmorillonite–Chlorella sorokiniana FK system as a typical case was applied to study Pb(II) biomineralization in the presence of usually co-existent Ca(II) and further reduce the migration and transformation of Pb(II) in the Ca(II) environment. Chlorella sorokiniana FK showed good resistance to Pb(II), and the addition of montmorillonite provided a more stable pH environment, which is conducive to the stability of Pb(II)-bearing bio-minerals. Montmorillonite created a low-biotoxicity environment in the overall process, especially less Pb(II) bio-adsorption capacity of individual Chlorella to protect the process of mineralization effectively. Batch experiment results also demonstrated that montmorillonite as the formation site of bio-minerals results in dispersed minerals on the surface of Chlorella and Chlorella–MMT composite, which is beneficial to the survival of Chlorella. Moreover, Pb(II)-bearing phosphate minerals tended to form in the Ca(II) environment rather than without Ca(II). This study demonstrated the mechanism of Pb(II) immobilization induced by Chlorella in the Ca(II) environment, further presenting a green, sustainable, and effective strategy for Pb(II) bio-immobilization combining clay minerals and microorganisms.

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Section: Xpsmentioning

confidence: 97%

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confidence: 99%