Article
Engineering, Environmental
Matt A. Limmer, Franklin A. Linam, Abby E. Evans, Angelia L. Seyfferth
Summary: Indicators of reduction in soil (IRIS) devices are low-cost soil redox sensors that can be used to quantify reducing conditions in soils. The removal of the metal oxide coating from the device surface indicates the presence of reducing conditions. However, the interpretation of coating removal may be complicated by the oxidation of Fe(II) and the resulting color change. This study investigated field-deployed Mn IRIS films to understand the mechanisms of Mn oxidation and the formation of minerals on the film surface.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Matt A. Limmer, Franklin A. Linam, Abby E. Evans, Angelia L. Seyfferth
Summary: Indicators of reduction in soil (IRIS) devices are low-cost soil redox sensors that can be used as indicators of reducing conditions in soils. The Mn IRIS devices, coated with birnessite, can oxidize Fe(II), resulting in a color change that complicates the interpretation of coating removal. Field-deployed Mn IRIS films showed reductions in Mn oxidation state when Fe precipitation was evident, and the decrease was due to the adsorption of Mn(II) to oxidized Fe and the precipitation of rhodochrosite (MnCO3).
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Macon J. Abernathy, Michael Schaefer, Roxana Ramirez, Abdi Garniwan, Ilkeun Lee, Francisco Zaera, Matthew L. Polizzotto, Samantha C. Ying
Summary: Anthropogenic emissions of vanadium into terrestrial and aquatic surface systems now match those of geogenic processes. However, the geochemistry of vanadium is poorly described in comparison to other comparable contaminants like arsenic. This study investigates the surface complexation of vanadium by common iron and manganese mineral phases, showing their importance in controlling the mobility and fate of vanadium in terrestrial and aquatic systems.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Soil Science
Magdalena Makiel, Michal Skiba, Marta Kisiel, Katarzyna Maj-Szeliga, Artur Blachowski, Wojciech Szymanski, Dorota Salata
Summary: The aim of this study was to investigate the weathering of glauconite in temperate climate soils, particularly the formation of iron oxyhydroxides. The study found that the weathering products of glauconite included Al-smectite-rich glauconite-smectite mixed-layered minerals, kaolinite, and iron oxyhydroxides. Soil color was predominantly influenced by the presence of glauconite.
Article
Environmental Sciences
Shimeng Xu, Shibei Zhu, Huixin Xiong
Summary: This study investigated the adsorption characteristics and mechanisms of phosphate ions by five synthesized isomeric FeOOH samples under different conditions. The results showed that FeOOH exhibited strong adsorption capacity for phosphate under specific pH conditions. The study also determined the maximum adsorption capacities of different FeOOH samples and found that SO42- had the strongest effect on phosphate adsorption.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Engineering, Environmental
Anna Yu. Romanchuk, Tatiana V. Plakhova, Anastasiia D. Konyukhova, Anastasiia Smirnova, Daniil A. Kozlov, Daniil A. Novichkov, Alexander L. Trigub, Stepan N. Kalmykov
Summary: The sorption behavior of Ce(III) on three common environmental minerals (goethite, anatase, and birnessite) was studied. Batch sorption experiments using a radioactive 139Ce tracer were conducted to examine the key characteristics of the sorption process. Different sorption kinetics and changes in oxidation states were observed for the sorption of Ce(III) on birnessite compared to the other minerals.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Valerie A. Schoepfer, Jullieta E. Lum, Matthew B. J. Lindsay
Summary: Adsorption and coprecipitation reactions with Fe(III) (oxyhydr)oxides play a role in Mo(VI) attenuation in geohydrologic systems. Mo(VI) coordination shifts from tetrahedral to octahedral during Fe(II)-induced ferrihydrite transformation. The effects of initial conditions, such as solution pH, Mo(VI) uptake mechanism, and Mo(VI) loading on repartitioning are not well understood.
ACS EARTH AND SPACE CHEMISTRY
(2021)
Article
Environmental Sciences
P. Dhakal, M. S. Coyne, D. H. McNear, O. O. Wendroth, M. M. Vandiviere, E. M. D'Angelo, C. J. Matocha
Summary: Chemodenitrification, the abiotic reduction of nitrite by iron (II), is an important process in nitrogen cycling due to its source of nitrous oxide production. This study investigated the reactivity of nitrite with goethite and Fe(II)-treated goethite under anoxic conditions. The results showed that nitrite removal by goethite was faster at pH 5.5 and involved a combination of sorption and reduction processes when high aqueous Fe(II) was present. The formation of a surface complex resembling protonated nitrite was observed with implications for nitrogen cycling and release of atmospheric pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Civil
Cui Gan, Zhaobo Luo, Chengyuan Su, Lei Tong, Hui Liu
Summary: In this study, the characteristics and mechanism of reactive co-transport of Fe2+ and antibiotics during groundwater discharge were investigated. Fe2+ was found to inhibit the transport of three antibiotics - sulfamethoxazole (SMX), ofloxacin (OFL), and oxytetracycline (OTC) in the quartz column, with the highest inhibitory intensity observed for OTC. The interaction between Fe2+ and antibiotics was influenced by factors like concentration and electrostatic repulsion.
JOURNAL OF HYDROLOGY
(2023)
Article
Materials Science, Multidisciplinary
Nibagani Naresh, Suyoon Eom, Sang Jun Lee, Su Hwan Jeong, Ji-Won Jung, Young Hwa Jung, Joo-Hyung Kim
Summary: In this study, a Co-doped dMO composite with reduced graphene oxide (GC-dMO) is developed using a simple cost-effective hydrothermal method. The GC-dMO cathode exhibits an excellent capacity of 302 mAh g(-1) at a current density of 100 mA g(-1) after 100 cycles as compared with the dMO cathode (159 mAh g(-1)). The excellent electrochemical performance of the GC-dMO cathode owing to Co-doping and graphene oxide sheets enhances the interlayer gap and disorderness, and maintains structural stability, which facilitates the easy reverse intercalation and de-intercalation of Zn2+ ions and H2O molecules.
ENERGY & ENVIRONMENTAL MATERIALS
(2023)
Article
Environmental Sciences
Lu Jiang, Pingxiao Wu, Yijing Xu, Yihao Li, Meiqing Chen, Zubair Ahmed, Nengwu Zhu
Summary: This study investigates the impact of ammonium ion (NH4+) on triclinic birnessite (TB) in the transformation of arsenite (As(III)). The presence of NH4+ significantly enhances the removal efficiency and oxidation rate of As(III) by TB. The improved oxidation state of Mn and the increase of oxygen vacancy due to the coexistence of NH4+ contribute to the advanced As(III) oxidation capacity of TB. The larger specific surface area of TB also enhances the oxidation capacity of As(III). This study provides a fundamental understanding of the behavior of TB with ammonium ion towards the transformation of As(III) in the environment.
ENVIRONMENTAL POLLUTION
(2022)
Article
Chemistry, Inorganic & Nuclear
Jinchao Hu, Hanlin Wang, Haibo Liu, Xuehua Zou, Luyao Wang, Ziyang Chu, Can Wang, Dong Chen, Tianhu Chen
Summary: The environmental fate of tetracycline in soil is closely related to goethite or birnessite, but their synergistic effect on TC transformation is unclear. In this study, a series of delta-MnO2@FeOOH materials were synthesized to investigate the interaction between alpha-FeOOH and delta-MnO2 for TC transformation. The results showed enhanced adsorption capacity for TC and selective degradation by the synergistic effect of delta-MnO2 and alpha-FeOOH.
SOLID STATE SCIENCES
(2023)
Article
Environmental Sciences
Yu Huang, Jiewen Yang
Summary: The presence of gallic acid (GA) was found to significantly promote the transformation of SMX by birnessite, especially at pH 6.0 compared to pH 4.0. The promotive effect was attributed to the addition reactions between SMX and GA quinones, as well as condensation reactions between -COOH of quinones and -NH2 of SMX or its transformation products.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agronomy
Michael D. H. Honda, Dulal Borthakur
Summary: Giant leucaena releases mimosine into the rhizosphere and interacts with iron. Mimosine enhances solubility of insoluble iron oxides and prevents conversion of ferric iron to insoluble oxides at an alkaline pH. Giant leucaena plants grown in alkaline soils and supplied with mimosine have higher levels of chlorophyll, iron, and manganese.
Article
Environmental Sciences
Xiong Yang, Lihu Liu, Yi Wang, Guohong Qiu
Summary: Combining organic acid washing and electrochemical removal provides an effective method for remediating highly arsenic-contaminated soils, enhancing arsenic mobility and reducing the content of arsenic bound to iron and aluminum in the soil. Increasing the voltage during the process results in higher arsenic removal efficiency from both the leachate and soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shiwei Lin, Xiong Yang, Lihu Liu, Anyu Li, Guohong Qiu
Summary: In this study, nitrogen-doped biochar (NBC) was synthesized and demonstrated to enhance the adsorption performance for heavy metals Cd(II) and As(III,V). The results expand the application of NBC for heavy metal removal, showing potential for efficient electrochemical removal of Cd(II) and arsenic from wastewater.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Agricultural Engineering
Anyu Li, Yue Zhang, Wenzhan Ge, Yutong Zhang, Lihu Liu, Guohong Qiu
Summary: This study synthesized a MgAl-LDH rice husk biochar composite and evaluated its performance and mechanism for removing Cd(II) and Cu(II) through adsorption experiments and models. The results showed that the composite material had high adsorption capacity and cycling ability, and the removal of heavy metals was mainly through surface precipitation and ion exchange.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Mingzhe Zhang, Lihu Liu, Anyu Li, Tengfei Zhang, Guohong Qiu
Summary: Arsenic is a significant threat to the environment and human health in polluted waters. This study demonstrated the synergistic oxidation of Fe(II)/As(III) under UV irradiation, which greatly enhanced the removal of As from acidic waters. The presence of Fe(II) promoted the generation of reactive oxygen species, facilitating the oxidation of As(III). Furthermore, the formation of ferric arsenate and amorphous ferric (hydr)oxides played a vital role in As removal.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Yi Wang, Lihu Liu, Xiong Yang, Steven L. Suib, Guohong Qiu
Summary: In this study, zero-valent iron was electrochemically oxidized to magnetic iron oxides, which showed high efficiency in removing As(V) from mining wastewaters. The results from simulated and actual wastewater experiments demonstrated that magnetic iron oxides, mainly magnetite and maghemite, had good adsorption capacity for As(V) and could achieve solid-liquid separation under a magnetic field. The removal ratio of As(V) was influenced by the potential and initial pH, and the presence of Cl- significantly enhanced the removal effect.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Xiong Yang, Lihu Liu, Yi Wang, Guohong Qiu
Summary: Combining organic acid washing and electrochemical removal provides an effective method for remediating highly arsenic-contaminated soils, enhancing arsenic mobility and reducing the content of arsenic bound to iron and aluminum in the soil. Increasing the voltage during the process results in higher arsenic removal efficiency from both the leachate and soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Correction
Chemistry, Multidisciplinary
Jian Hua, Chengshuai Liu, Fangbai Li, Zhenke Zhu, Zhiqi Wei, Manjia Chen, Ting Gao, Guohong Qiu
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Engineering, Environmental
Anyu Li, Wenzhan Ge, Lihu Liu, Yutong Zhang, Guohong Qiu
Summary: This study successfully synthesized an amine-functionalized magnesium ferrite-biochar composite and investigated its performance and mechanisms for removing or immobilizing heavy metals in wastewater and polluted soils. The mechanisms in wastewater treatment primarily involved complexation and ion exchange, while in soils polluted by heavy metals, immobilization was achieved through electrostatic attraction, precipitation, and complexation. This new type of biochar composite has shown effectiveness in simultaneously removing and immobilizing heavy metals in wastewater and soil.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Jun Hong, Lihu Liu, Ziwei Zhang, Xiange Xia, Li Yang, Zengping Ning, Chengshuai Liu, Guohong Qiu
Summary: The photooxidation of arsenopyrite in the presence of SO42- was investigated in this study. It was found that SO42- could accelerate the oxidation of arsenopyrite and As(III), and the photooxidation rate showed a U-shaped relationship with the concentration of SO42-. The study provides insights into the role of SO42- in promoting the photooxidation of arsenopyrite and the release of As in acidic mining environments.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Lihu Liu, Diman Guo, Guohong Qiu, Chengshuai Liu, Zengping Ning
Summary: This study reveals that oxidation and immobilization of arsenite (As(III)) on pyrite can be significantly promoted by reactive oxygen species (ROS) in sunlit acid mine drainage (AMD), particularly by hydroxyl radicals (·OH), providing new insights into the environmental behaviors of arsenic.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Lihu Liu, Mingzhe Zhang, Steven L. Suib, Guohong Qiu
Summary: The oxidation capacity and reusability of Fe-Mn composite oxide (FMO) for As(III) were efficiently improved by light radiation, and the effect of typical coexisting ions on the removal of As(III) was also studied.
Article
Geochemistry & Geophysics
Lihu Liu, Ziwei Zhang, Mingzhe Zhang, Xiong Yang, Chengshuai Liu, Guohong Qiu
Summary: This study investigated the process of realgar oxidation and arsenic release, and explored the influence of environmental factors on the reaction. The results showed that oxygen and solar radiation can promote the oxidation of realgar and release of arsenic, and the concentration of dissolved oxygen and pH have an impact on the reaction process.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
Yi Wang, Shiwei Lin, Lihu Liu, Feng Wang, Xiong Yang, Guohong Qiu
Summary: In this study, biochar was successfully incorporated with birnessite to synthesize composites (BC-Mn) for effective electrochemical removal of cadmium (Cd(II)) from water. The electrosorption capacity of BC-Mn for Cd(II) increased with increasing birnessite content and reached equilibrium at a Mn content of 20% (BC-Mn20). The Cd(II) adsorption capacity of BC-Mn20 reached a maximum at 1.2 V and pH 5.0, with a value of 104.5 mg g(-1).
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Environmental Sciences
Xiong Yang, Lihu Liu, Yi Wang, Tao Lu, Ziwei Wang, Guohong Qiu
Summary: The reagent-free electrochemical precipitation method proposed in this study effectively removes mixed heavy metal ions extracted from soils by citrate. After 12 hours of electrolysis at 26 mA cm-2, the concentrations of toxic heavy metals were reduced by over 99.4%. The method exhibited high stability and decreased the concentrations of As, Zn, Pb, and Cd in the leachate to below the limits of industrial wastewater discharge.
ENVIRONMENTAL POLLUTION
(2023)
Article
Engineering, Environmental
Haoyu Yin, Lihu Liu, Jinxing Ma, Changyong Zhang, Guohong Qiu
Summary: This study constructed an asymmetric flow-electrode electrochemical separation (AFES) system, which efficiently removes As(III) from groundwater. The system achieves this through self-alkalization and the adsorption of H+ on the cathode, resulting in the removal of As(V) predominantly. The system shows stability and superior removal performance.
Article
Chemistry, Multidisciplinary
Xinfei Ge, Lijun Wang, Xiong Yang, Guohong Qiu, Wenjun Zhang
Summary: It has been discovered that redox-active antibiotics can enhance the bioavailability of phosphorus by reducing iron oxides and solubilizing adsorbed phosphorus. However, the quantitative effects of these antibiotics on iron-phosphorus minerals in natural environments with extracellular polymeric substances (EPS) have not been well studied. This research used phenazine antibiotics as a case study and conducted experiments to measure the production of iron and solubilization of phosphorus, as well as the dissolution kinetics of iron-phosphorus minerals. The study found that the presence of EPS and redox-active antibiotics can significantly increase the bioavailable pools of iron and phosphorus.
ENVIRONMENTAL SCIENCE-NANO
(2022)
