Article
Engineering, Environmental
G. Scullett-Dean, J. L. Hamilton, O. Repina, H. E. A. Brand, E. D. Burton, M. Saunders, T. C. Santini
Summary: This study investigated the incorporation of various minor and trace elements into hematite and their effects on the physical and chemical properties of the mineral. It was found that the simultaneous incorporation of Al, Cr, V, and Zn showed both synergistic and antagonistic effects among certain element combinations. However, Mo had minimal association with hematite, while As completely prevented its formation. The results provide new insights into trace element geochemistry in hematite and emphasize the importance of multi-element studies in understanding natural and anthropogenic systems.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Soil Science
Jing Liu, Runliang Zhu, Lingya Ma, Haoyang Fu, Xiaoju Lin, Stephen C. Parker, Marco Molinari
Summary: This study demonstrates that ferrihydrite has the strongest adsorption capacity for phosphate and cadmium among the three iron (oxyhydr)oxides studied, with synergistic adsorption of phosphate and cadmium observed. The research reveals the adsorption behaviors and mechanisms of different minerals, providing insights for developing surface complexation models.
Article
Environmental Sciences
Jianwei Lin, Weijie Xiang, Yanhui Zhan
Summary: The characteristics and mechanism of phosphate adsorption onto magnetite, hematite, and goethite were comparatively studied, and it was found that magnetite has a higher adsorption capacity. Additionally, the amendment and capping materials of magnetite, hematite, and goethite can effectively suppress the release of endogenous phosphorus from sediment into the overlying water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Jianwei Lin, Weijie Xiang, Yanhui Zhan
Summary: The characteristics and mechanism of phosphate adsorption onto magnetite, hematite and goethite were studied, and the effects of magnetite, hematite and goethite amendment and capping on endogenous phosphorus (P) liberation from sediment into overlying water (OW) were investigated. The adsorption of phosphate onto magnetite, hematite and goethite followed the inner-sphere complexation mechanism, and the phosphate adsorption capacity decreased in the order of magnetite>goethite>hematite. The magnetite, hematite and goethite amendment can all decrease the risk of endogenous P release into OW, with magnetite being the most effective.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Jinmei Lu, Xiaoyong Long, Xiang Li, Junfeng Ji, Xiaoke Qiang, Yougui Song
Summary: Volcanic activities play a key role in the evolution of planetary atmosphere and geomorphology. Iron oxide differentiation varies on different slopes of volcanoes, and antiferromagnetic and ferrimagnetic particles are major factors determining soil color and magnetism, serving as indicators for tracing processes.
Article
Geochemistry & Geophysics
Si Athena Chen, Peter J. Heaney, Jeffrey E. Post, Peter J. Eng, Joanne E. Stubbs
Summary: Iron (oxyhydr)oxides, such as goethite and hematite, are important indicators of pH, Eh, temperature, microbial activity, and climate conditions in the Critical Zone. This study examined the transformation of two-line ferrihydrite to goethite and hematite under various temperature and pH conditions. The results showed that both goethite and hematite nucleated simultaneously from ferrihydrite and their relative abundances changed with temperature, pH, and water activity. These findings have implications for using hematite-goethite ratios as paleoclimate proxies in low pH buffering systems.
Article
Polymer Science
Dimace Lionel Vofo Ngnintedem, Marco Lampe, Herve Kouamo Tchakoute, Claus Henning Ruescher
Summary: The current study investigates the influence of iron minerals on the properties of geopolymer materials. The additions of hematite, magnetite, and goethite remain largely unreacted in the binder, affecting the compressive strength. The presence of voids and cracks in the micrographs of geopolymer materials is related to the gel formation and the interaction between the gel and crystalline additions.
Article
Chemistry, Physical
Marcel G. Goren, Ralph M. Bolanz, Stephen Parry, Jorg Goettlicher, Ralph Steininger, Juraj Majzlan
Summary: This study investigated the structural incorporation of molybdenum in hematite, goethite, and six-line ferrihydrite using a combination of X-ray absorption spectroscopy, powder X-ray diffraction, and inductively-coupled plasma optical emission spectrometry. The results showed that molybdenum could be structurally incorporated in these minerals, forming coordination environments similar to iron. X-ray absorption and diffraction analyses revealed differences in the structural incorporation of molybdenum in different iron oxide minerals.
CLAYS AND CLAY MINERALS
(2021)
Article
Environmental Sciences
Hem Chandra Sharma, Hao Chen, Aneesh Kumar Chandel
Summary: This study investigates the use of modified biochar with iron minerals for the adsorption and degradation of organic contaminants. The results show that the modified biochar has better sorption ability and higher persulfate activation capacity, leading to enhanced removal of the target contaminant.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Wei Cheng, Remi Marsac, Khalil Hanna, Jean-Francois Boily
Summary: This study investigated the competitive adsorption of dissolved silicate and organic contaminants on goethite surfaces, revealing that high silicate concentrations can displace pre-bound organic molecules. The competition process involves interactions between species and their impact on the goethite surface properties.
Article
Chemistry, Multidisciplinary
Mark Baranov, Yan Duan, Nitai Leffler, Shani Avineri, Vladimir Ezersky, Ira A. Weinstock
Summary: In this study, entirely inorganic polyoxometalate cluster-anion ligands are used to trap and impart heat resistance to metastable metal-oxide based NCs. This is demonstrated by trapping 6-line ferrihydrite NCs, which are intermediates in the spontaneous conversion of beta-FeOOH to hematite (alpha-Fe2O3). The results suggest that polyoxometalate ligation may be a general method for stabilizing metastable phases as the cores of entirely inorganic macro-anion like complexes.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Muhammad Aqeel Kamran, Sadia Bibi, Baoliang Chen, Jun Jiang, Ren-Kou Xu
Summary: The presence of organic matter such as biochar can alter the availability of macronutrients like phosphorus. This study investigated the adsorption characteristics of phosphorus on pure iron (hydr)oxides and the effect of biochar. The results showed that the presence of biochar reduced phosphorus adsorption on mineral surfaces.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2022)
Article
Geochemistry & Geophysics
Fatima Meite, Thomas Hauet, Patrick Billard, Tom Ferte, Mustapha Abdelmoula, Asfaw Zegeye
Summary: Anthropogenic activities have resulted in the accumulation of Pb in the environment, posing a threat to ecosystems. This study investigates the impact of Pb on the bioreduction and transformation processes of iron oxides, which play a crucial role in controlling the environmental fate of Pb. The findings highlight the sensitivity of magnetism as a monitoring method and provide insights into the behavior of Pb in the presence of iron-reducing bacteria.
Article
Chemistry, Physical
Walber Goncalves Guimaraes Jr, Guilherme Ferreira de Lima, Helio Anderson Duarte
Summary: A chemical model for the isomorphic substitution of Al in poorly crystalline oxyhydroxide Ferrihydrite (Fh) has been proposed. Using DFT/plane wave calculations, it was found that Al prefers to replace the octahedral Fe sites. The substitution of Al affects the quadrupolar coupling constant of Al-27 NMR and Mo''ssbauer quadrupole splitting and isomer shift parameters, which are influenced by the concentration of substituted sites. Additionally, Al substitution increases the band gap dispersion and the formation of Al electronic states in the conduction band. The standard Helmholtz free energy of Al substitution has also been estimated and discussed in detail.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Walber Goncalves Guimaraes Jr, Guilherme Ferreira de Lima, Helio Anderson Duarte
Summary: Ferrihydrite (Fh) is an important oxy-hydroxide that plays significant roles in geochemistry, ion mobility, adsorption, and the formation of more crystalline phases. This study proposes a chemical model for the substitution of Fe sites by Al in Fh. DFT/plane wave calculations reveal the local environment and investigate the structural and electronic properties of Al-substituted Fh. The results show that Al prefers to replace the octahedral Fe sites and affect various parameters such as NMR and Moessbauer parameters.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Geochemistry & Geophysics
Zhaoxia Jiang, Qingsong Liu, Andrew P. Roberts, Mark J. Dekkers, Vidal Barron, Jose Torrent, Sanzhong Li
Summary: Hematite is a common canted antiferromagnetic mineral with a reddish color. Its identification and quantification can be conveniently achieved through magnetic and color properties. Understanding hematite's characteristics and content is crucial for studies of the iron cycle, paleoenvironmental evolution, and research on Mars. However, previous research mainly focuses on stoichiometric hematite, neglecting the effects of cation substitution. Remagnetization is another complex problem associated with hematite. Recognizing the properties of cation-substituted hematite and understanding remagnetization mechanisms are important for identifying and interpreting the magnetic signals carried by hematite.
REVIEWS OF GEOPHYSICS
(2022)
Article
Environmental Sciences
Anna A. Paltseva, Maha Deeb, Erika Di Iorio, Luana Circelli, Zhongqi Cheng, Claudio Colombo
Summary: The successful use of visible and near-infrared reflectance spectroscopy analysis combined with principal component regression and partial least-square regression was applied to detect different forms of lead. Linear discriminant analysis was used to classify soil into different categories of lead contamination risks. Different models were used to predict and compare total and bioaccessible lead concentrations.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Plant Sciences
Pablo Gonzalez-Caballo, Vidal Barron, Jose Torrent, Maria Carmen del Campillo, Antonio Rafael Sanchez-Rodriguez
Summary: This study assessed the effects of soil and foliar application of zinc on plant growth and phosphorus and zinc uptake by wheat and maize grown on calcareous soils. The results showed that applying zinc at different phenological stages significantly improved the zinc content and quality of grains. On calcareous soils, zinc application increased biomass in maize, and foliar spraying at stem elongation or flowering had the greatest effect on wheat.
JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
(2022)
Article
Agronomy
Romario Porto de Oliveira, Ronny Sobreira Barbosa, Jose Marques Junior, Yuri Jacques Agra Bezerra da Silva, Vidal Barron, Jussara Silva Dantas, Jose Maria Do Amaral Resende, Adriano Venicius Santana Gualberto
Summary: Diffuse reflectance spectroscopy was evaluated for predicting soil attributes with positive results, showing potential as an accurate alternative for estimating different components in soil.
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
(2022)
Article
Geochemistry & Geophysics
Wei Cao, Zhaoxia Jiang, Congcong Gai, Vidal Barron, Jose Torrent, Yi Zhong, Qingsong Liu
Summary: Hematite concentration is an important indicator for environmental studies. Diffuse reflectance spectroscopy is an effective method for identifying and quantifying hematite. This study determined the detectable range of hematite and proposed an effective transfer function through synthesizing samples and testing natural sediments.
Article
Geosciences, Multidisciplinary
Erika Di Iorio, Pasquale Napoletano, Luana Circelli, Valeria Memoli, Lucia Santorufo, Anna De Marco, Claudio Colombo
Summary: This study compares the soil biological properties and carbon storage of three young Technosols derived from volcanic soil in Campi Flegrei, Italy, with two natural volcanic soils. The results show that Technosols have lower soil organic matter content compared to natural volcanic soils. However, after six years of vegetation, Technosols show significant potential for carbon sequestration and supporting biological activity.
Review
Environmental Sciences
Erika Di Iorio, Luana Circelli, Ruggero Angelico, Jose Torrent, Wenfeng Tan, Claudio Colombo
Summary: This review focuses on the surface colloidal properties of iron oxides and their reactivity with humic substances, as well as the effects of humic substance adsorption/precipitation on the binding of metalloid and trace elements. Future research directions include investigating the ability of Fe nano-particles to increase Fe bioavailability, improve carbon sequestration, reduce greenhouse gas emissions, and decrease the impact of persistent organic and inorganic pollutants.
Article
Geosciences, Multidisciplinary
Anna De Marco, Pasquale Napoletano, Speranza Claudia Panico, Valeria Memoli, Lucia Santorufo, Anna Gabriella Ruggiero, Claudio Colombo, Rossella Barile, Giulia Maisto
Summary: The combined action of alien plants invasion and fire occurrence can strongly alter local biodiversity and soil functions, especially in the Mediterranean area. The study found that the invasive black locust has significant effects on soil characteristics and microbial community responses in Mediterranean shrublands and pine forests. The invasion increases pH, water holding capacity, bulk density, soil organic matter content, and soil nitrogen content. It also improves the content and availability of certain elements in the soil and stimulates microbial growth. However, the combined impact of black locust invasion and fire occurrence does not show specific changes in the investigated stands.
Article
Environmental Sciences
Pasquale Napoletano, Noureddine Guezgouz, Erika Di Iorio, Claudio Colombo, Giulia Guerriero, Anna De Marco
Summary: The aim of this research was to investigate the impact of urbanization and agriculture on soil quality by studying heavy metal accumulation in the riparian ecosystems of Medjerda river. The study found higher concentrations of heavy metals in urban and peri-urban areas compared to non-urban areas. The results also showed a strong impact of heavy metals on soil quality in urban areas.
Article
Soil Science
Tatiele Fruett, Alberto Vasconcellos Inda, Vidal Barron, Yuri Lopes Zinn, Keyrauan Taha, Antonia Finkler Dias Fernandes
Summary: This study assessed how conversion from native grasslands to annual crops and eucalyptus stands in the southern region of Brazil affected soil properties over a period of 30 years. The results showed that soil organic carbon concentration was significantly higher under eucalyptus compared to native grasslands, while basic cations and available phosphorus increased under both croplands and eucalyptus. The study also found that magnetic susceptibility, total iron and aluminum concentrations decreased under eucalyptus and cropland, which could be attributed to lower clay contents.
Review
Chemistry, Multidisciplinary
Ruggero Angelico, Claudio Colombo, Erika Di Iorio, Martin Brtnicky, Jakub Fojt, Pellegrino Conte
Summary: Natural organic matter, such as humic substances (HS), is composed of complex structures stabilized by various interactions. Different models have been proposed to describe the physicochemical properties of HS, including a hydrogel-like structure or mass/surface fractals. This study critically reviews and revisits these models, aiming to provide key insights into the structural organization of HS and their roles in the environment.
APPLIED SCIENCES-BASEL
(2023)
Article
Soil Science
Pasquale Napoletano, Costantina Barbarisi, Valeria Maselli, Daniela Rippa, Carmen Arena, Maria Grazia Volpe, Claudio Colombo, Domenico Fulgione, Anna De Marco
Summary: The study aimed to evaluate the immediate impact of invasive wild boar on olive orchards in southern Italy. Seasonal changes in soil biology, chemistry, leaf and fruit characteristics were measured over a one-year period in grubbed and ungrubbed areas. The results showed that grubbing increased soil moisture, pH, organic matter, and C/N ratio in the topsoil, but reduced these parameters at a greater depth. Microbial biomass and fungal activity were also influenced by grubbing, with different effects observed at different depths. The study concluded that wild boar grubbing negatively impacted soil quality and fruit polyphenol content, particularly in the Autumn/Winter season.
Article
Agriculture, Multidisciplinary
Tatiele Fruett, Alberto Vasconcellos Inda, Vidal Barron, Enilson Luiz Saccol de Sa, Keyrauan Taha, Antonia Finkler Dias Fernandes
Summary: Termites selectively alter the physical and chemical properties of soils in their mound building process. This study in Brazil found that termites prefer clay-sized particles such as kaolinite, gibbsite, and iron oxides over larger particles like quartz. The mounds had increased content of clay fraction, organic carbon, and iron oxides, resulting in specific surface area increments.
