The transformation of lepidocrocite (γ-FeOOH) with Fe(<sc>ii</sc>)(aq) in slightly acidic media: intermediate pathways and biomimetic behavior

被引：0

作者：

Gomez, Mario Alberto ^{[1
,2
]}

Chen, Yiwen ^{[2
]}

Song, Miao ^{[3
]}

Li, Dongsheng ^{[3
]}

Lea, Alan Scott ^{[4
]}

Yao, Shuhua ^{[2
]}

Duan, Yihang ^{[5
]}

Jia, Yongfeng ^{[5
]}

Cai, Yige ^{[1
]}

Xiao, Tangfu ^{[1
]}

机构：

[1] Guangzhou Univ, Sch Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China

[2] Shenyang Univ Chem Technol, Liaoning Engn Res Ctr Treatment & Recycling Indust, Shenyang 110142, Liaoning, Peoples R China

[3] Pacific Northwest Natl Lab, Phys & Computat Sci Directorate, Richland, WA 99352 USA

[4] Pacific Northwest Natl Lab, Environm & Biol Sci Directorate, Richland, WA 99352 USA

[5] Chinese Acad Sci, Inst Appl Ecol, Key Lab Pollut Ecol & Environm Engn, Shenyang 110016, Liaoning, Peoples R China

来源：

ENVIRONMENTAL SCIENCE-NANO | 2024年 / 11卷 / 12期

基金：

中国国家自然科学基金;

关键词：

IN-SITU TEM; FE(II)-CATALYZED TRANSFORMATION; ELECTROCHEMICAL REDUCTION; 2-LINE FERRIHYDRITE; ELECTRON-MICROSCOPY; SURFACE OXIDATION; GREEN-RUST; THIN-FILMS; IRON; ADSORPTION;

D O I：

10.1039/d4en00670d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Lepidocrocite (LP) is commonly found in natural or anthropogenic environments and oxidized alloy steel waste storage containers. Despite its importance, the end products formed and its mineral transformation pathways, including intermediate steps and underlying mechanisms under Fe(ii)(aq) catalysis still need to be clarified due to decades of dispersed research. In this work, we investigated LP's catalytic transformation with 10 mM and 0.2 mM Fe(ii)(aq) at their natural solution pH's via bulk (X-ray Diffraction/XRD, Raman and Attenuated Total Reflectance Fourier Transform Infrared/ATR-FTIR) and micro/nano-scale (semi in situ Transmission Electron Microscopy/TEM) analysis. In general, we observed that goethite (GT) and LP were the main end products. However, a series of two major distinct intermediate events that were initiated by a dissolution type of reaction along with an "induction period" (lack of dissolution) on LP occurred. Fascinatingly, two of the intermediate steps along its mineral transformation presented novel types of non-classical mechanisms of crystallization via some type of guided oriented particle attachment. Furthermore, one of these intermediate steps is biomimetic in appearance, similar to what is observed during bacterial particle attachment. However, it uses inorganic nano-wire antennas that have a sensory-like function as observed with bacterial fimbriae and/or flagellum through an electron transparent film (similar to a bio-film matrix). Finally, this work leads us to comprehend the evolution of some well documented crystal morphologies for GT commonly observed in natural and anthropogenic settings.

引用

页码：4730 / 4742

页数：14