Pedosphere 35(1): 42--52, 2025
ISSN 1002-0160/CN 32-1315/P
©2025 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Review of the structural properties and interfacial reactions of Al-substituted goethite, hematite and ferrihydrite |
Yu LIANG1, Hongfeng CHEN2 , Jinling XU3, Mingxia WANG4, Wenfeng TAN4 |
1 Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101 (China)
2 Hubei Field Observation and Scientific Research Stations for Water Ecosystem in Three Gorges Reservoir, China Three Gorges University, Yichang 443002 (China)
3 College of Geography and Environment, Shandong Normal University, Jinan 250358 (China)
4 State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070 (China) |
| ABSTRACT |
| Isomorphic substitution of ferric ion (Fe3+) by aluminum ion (Al3+) in iron (hydro)oxides is ubiquitous in natural environments. Aluminum substitution inevitably leads to changes in the microstructures, physicochemical properties, and surface reactions of iron (hydro)oxides, which may have great impacts on the sequestration of nutrients and contaminants in soils and aquatic environments. Over the past decades, the structural properties and surface reactivity of Al-substituted iron (hydro)oxides have been intensively studied. Iron (hydro)oxides in various structural forms and with different Al substitution amounts present high application potentials in addressing environmental issues. A timely summary of the structural properties and interfacial reactions of the most common and representative Al-substituted iron (hydro)oxides is of significance. Herein, the effects of Al substitution on the structural properties and surface activities of iron (hydro)oxides were clarified according to the microstructure, crystal facets, surface site type and density, interfacial reaction mechanisms, and modeling parameters of iron (hydro)oxides. This review systematically elucidates how Al substitution affects the structural properties and surface reactions of iron (hydro)oxides, including the well crystallized goethite and hematite and the poorly crystallized ferrihydrite, providing theoretical guidance for further exploration of the mineralogical characteristics and environmental geochemical behaviors of iron (hydro)oxides. |
| Key Words: adsorption,defective structure,iron (hydro)oxide,isomorphic substitution,surface active site,surface charge behavior |
| Citation: Liang Y, Chen H F, Xu J L, Wang M X, Tan W F. 2025. Review of the structural properties and interfacial reactions of Al-substituted goethite, hematite and ferrihydrite. Pedosphere. 35(1): 42-52. |
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