Article
Engineering, Environmental
Xiaolin Cai, Laurel K. ThomasArrigo, Xu Fang, Sylvain Bouchet, Yanshan Cui, Ruben Kretzschmar
Summary: The presence of polygalacturonic acid and humic acid promoted the reductive dissolution of ferrihydrite, resulting in increased release of arsenic compared to ferrihydrite without organic matter. Arsenic-XAS results showed a higher fraction of solid-phase arsenite in the presence of organic matter.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Zahra Arabi, Joerg Rinklebe, Ali El-Naggar, Deyi Hou, Ajit K. Sarmah, Eduardo Moreno-Jimenez
Summary: Biochar shows promise in immobilizing trace elements in contaminated soils, but the effect on arsenic mobilization may be negative while it efficiently immobilizes chromium and nickel. Factors such as pyrolysis conditions, organic matter content, and feedstock influence the effectiveness of biochar in immobilizing trace elements in contaminated soils.
ENVIRONMENTAL POLLUTION
(2021)
Article
Engineering, Environmental
Kun Gao, Yue Hu, Chuling Guo, Changdong Ke, Guining Lu, Zhi Dang
Summary: The addition of dissolved SO42- can mitigate the migration of As into the aqueous phase and replace jarosite with mackinawite. The microbial sulfidization of As-bearing jarosite by sulfate reducing bacteria reduced all As5+ to As3+, which is important for a better understanding of the geochemical cycling of elements As, S, and Fe in acid mine drainage and acid sulfate soil environments.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Yue Shen, Haodan Yu, Jiahui Lin, Ting Guo, Zhongmin Dai, Caixian Tang, Jianming Xu
Summary: This study found that tetracycline addition significantly promoted the reduction and release of arsenic in flooded soils, mainly by increasing the concentration of dissolved organic carbon and lowering soil redox potential. Additionally, tetracycline also increased the relative abundances of As-reducing genes and resistant bacteria, playing a key role in stimulating As reduction.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Jin-li Cui, Jinsu Yang, Yanping Zhao, Tingshan Chan, Tangfu Xiao, Daniel C. W. Tsang
Summary: Understanding the distribution and speciation of arsenic (As) associated with iron (Fe) in subsoil profiles is important for predicting the immobilization of high geogenic As and safe utilization of As-containing soil during land development. This study investigated the As enrichment mechanisms in four subsoil cores from Hong Kong using sequential chemical extraction and X-ray absorption near edge spectroscopy. The results showed that the subsoil profiles had relatively high concentrations of As, mainly in the form of As(V) associated with the residual fraction. Poorly crystalline Fe (oxyhydr)oxides played a key role in immobilizing most of the high geogenic As.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Jie Gao, Tianliang Zheng, Yamin Deng, Hongchen Jiang
Summary: The study investigated the processes controlling arsenic mobilization under bacterial sulfate reduction in aquifer sediments, revealing the concurrent occurrence of sulfate, Fe(III), and arsenate reduction. The increase in abundance of sulfate-reducing bacteria facilitated sulfate reduction activity, while the limited ability of newly-formed Fe-sulfide minerals to sequester As led to a transient attenuation followed by re-increase of aqueous As.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Meng Zhu, Xiaobao Wei, Yuhuan He, Chongxin Huang, Mengxin Li, Shu Wang, Ruyi Yang
Summary: This study investigated the coupled impacts of Fe and sulfate reduction on the mobilization, thionation, and sequestration of DPAA in a paddy soil. The results showed that both Fe and sulfate reduction significantly enhanced the mobilization of DPAA, but sulfate addition can reduce this contamination.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Article
Engineering, Environmental
Xing Yang, Marvin Hinzmann, He Pan, Jianxu Wang, Nanthi Bolan, Daniel C. W. Tsang, Yong Sik Ok, Shan-Li Wang, Sabry M. Shaheen, Hailong Wang, Jorg Rinklebe
Summary: Contamination of paddy soils by arsenic is a major concern, and animal-derived biochar can impact the mobilization of As under fluctuating redox conditions. Pig carcass-derived biochar was found to decrease the concentration of dissolved As under oxidizing conditions, but increase it under reducing conditions in contaminated paddy soils.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Ali El-Naggar, Scott X. Chang, Yanjiang Cai, Young Han Lee, Jianxu Wang, Shan-Li Wang, Changkook Ryu, Joerg Rinklebe, Yong Sik Ok
Summary: Biochar's impact on the mobilization of potentially toxic elements in multi-contaminated soils is still not well-understood. The study found that biochar had varying effects on the mobilization of arsenic and lead, with surface functional groups on wood biochar promoting the conversion of lead.
ENVIRONMENT INTERNATIONAL
(2021)
Article
Environmental Sciences
A. S. M. Fazle Bari, Dane Lamb, Geoff R. MacFarlane, Mohammad Mahmudur Rahman
Summary: This study investigated the remediation of arsenic-contaminated abandoned mine soils. Oxalic acid was found to be the most effective washing reagent. Washing reduced the leachability and bioaccessibility of arsenic and iron in the treated soil, but it still exceeded the remediation criteria. Soil washing and subsequent solidification/stabilization could be an alternative option for remediating extremely contaminated abandoned mine soils.
Article
Chemistry, Physical
Zhiliang Chen, Lihang An, Hang Wei, Jianqiang Zhang, Qi Zou, Mengqiang Sun, Ling Huang, Minchao Liu
Summary: The study found that the addition of nitrate can accelerate the reduction of soil Eh, inhibit dissimilatory iron reduction, and promote arsenic speciation transformation, making it an effective amendment for arsenic immobilization in paddy soils.
SURFACES AND INTERFACES
(2021)
Article
Environmental Sciences
Meng Wang, Lifu Wang, Huading Shi, Yongbing Liu, Shibao Chen
Summary: Sodium sulfate stress can enhance cadmium mobilization in soil, microbial sulfur oxidation, and Cd resistance, leading to the accumulation of stress tolerance-associated metabolites. The stimulation of soil microbial communities with sodium sulfate resulted in the up-regulation of sulfur metabolism and the increased secretion of organic acids, potentially driving the mobility of Cd in soil. Certain bacterial species, such as Pseudomonas and Erythrobacter, showed a high capacity for adaptation to heavy metal and sulfur-induced stress, with increased genes and metabolites for sulfur cycling and Cd resistance.
ENVIRONMENTAL RESEARCH
(2021)
Article
Geochemistry & Geophysics
Susanta Paikaray, Stefan Peiffer
Summary: The study found that the mobility of arsenic in soil is influenced by soil constituents and crop practices, with arsenic release mainly occurring through an ion exchange mechanism. Despite poor bioavailability, a higher amount of arsenic can be released through the phosphate extraction process.
APPLIED GEOCHEMISTRY
(2022)
Article
Engineering, Environmental
Shibao Chen, Li Chen, Duo Wang, Meng Wang
Summary: This study reveals a key mechanism controlling Cd stabilization in soil, providing a quantitative and mechanistic understanding of Cd remobilization. The study also suggests that under highly reducing soil conditions, methanogenesis outcompetes sulfate reduction for available electrons.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Xuhui Zhang, Matthew C. Reid
Summary: This study reveals that methane generation activity can suppress the biovolatilization of arsenic in flooded rice paddy soil by enhancing the rate of arsenic demethylation. This finding contributes to a better understanding of the biogeochemical processes regulating arsenic biovolatilization in anaerobic soil environments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Chad W. Stone, Chris Hall, Oliver M. Pohl, Anthony F. Hollenkamp, Russell H. Newnham, Peter J. Mahon, Rosalie K. Hocking
Summary: This study demonstrates that high-energy X-ray imaging can be used to investigate the spatial and electrochemical dimensions in lead-acid batteries. The imaging results show the presence of multiple features associated with battery failure and reveal the inhomogeneous utilization of the negative electrode. This technique provides valuable insights into the relationship between chemistry and performance in lead-acid batteries.
JOURNAL OF POWER SOURCES
(2023)
Article
Multidisciplinary Sciences
Kamran Dastafkan, Xiangjian Shen, Rosalie K. Hocking, Quentin Meyer, Chuan Zhao
Summary: Electrocatalytic synergy is a functional concept that is often underestimated. This study demonstrates interphasic synergy in monometallic structures, showing the effective interaction between Ni(OH)2 and Ni-N/Ni-C phases for the hydrogen evolution reaction. The development of a Ni(OH)2@Ni-N/Ni-C hetero-hierarchical nanostructure significantly reduces overpotentials in alkaline media, making it a promising strategy for designing electrocatalysts in water splitting and other energy applications.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
William W. Bennett, Enzo Lombi, Kirk G. Scheckel, Ryo Sekine, Scott G. Johnston, Edward D. Burton, Daryl L. Howard, Peter Kappen, Donald E. Canfield
Summary: This study demonstrates the utility of synchrotron-based X-ray spectroscopic techniques in investigating the geochemistry of vanadium in ancient marine sediments. The results show that vanadium is primarily hosted by phyllosilicate-III and is strongly associated with potassium-rich clay minerals. The findings suggest that differentiating authigenic and detrital vanadium in ancient marine sediments may not be possible, which has implications for vanadium isotope system studies.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Engineering, Environmental
Niloofar Karimian, Scott G. Johnston, Ehsan Tavakkoli, Andrew J. Frierdich, Edward D. Burton
Summary: Jarosite, a common mineral in acidic sulfur-rich environments, can strongly sorb both As(V) and Sb(V). Little is known regarding the mechanisms that control simultaneous co-sorption of As(V) and Sb(V) to jarosite. This study examined the sorption mechanisms of As(V) and Sb(V) to jarosite, revealing a strong contrast in their sorption behaviors.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
C. Felipe Garibello, Alexandr N. Simonov, Shery L. Y. Chang, Bernt Johannessen, Francois Malherbe, Daniel S. Eldridge, Rosalie K. Hocking
Summary: Ironsulfides are key materials in metalloprotein catalysis. One interesting aspect is their incorporation of secondary metals, such as Mo. The selectivity of reduction products depends on the amount of Mo present, with approximately 10% Mo optimizing NH4 (+)/NH3 production from NO2 (-) and minimizing competitive H-2 formation.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Thilini Thathsara, Jaydon Meilak, Mohammad Sangchap, Christopher Harrison, Rosalie Hocking, Mahnaz Shafiei
Summary: This study proposes a sensitized composite of titanium dioxide nanoparticles enclosed in reduced graphene oxide nanosheets for hydrogen gas sensing under low voltage and low temperature conditions. By suppressing electron-hole recombination and creating heterojunctions, the sensing performance is enhanced. The fabricated material exhibits high response, selectivity, stability, environmental friendliness, and energy efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Environmental Sciences
Evelyn Dillon, Bree Morgan, Daniel T. Oldfield, Edward D. Burton, Jessica Veliscek-Carolan
Summary: Hierarchically porous titania beads with and without amine functionalisation were developed as adsorbents for highly toxic As(V) removal from acid mine drainage (AMD)-affected environments. The beads showed selective removal of As(V) over other competing elements, with different adsorption mechanisms for Fe(II)/Fe(III). The adsorption capacity of As(V) decreased in real AMD solutions, and non-functionalised titania beads were considered preferable for As remediation due to their greater selectivity. Porous titania beads with functionalisation offer a promising and flexible technology for remediating AMD-affected environments.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
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
Chemistry, Multidisciplinary
Thanh Tran-Phu, Manjunath Chatti, Joshua Leverett, Thi Kim Anh Nguyen, Darcy Simondson, Dijon A. Hoogeveen, Alexander Kiy, The Duong, Bernt Johannessen, Jaydon Meilak, Patrick Kluth, Rose Amal, Alexandr N. Simonov, Rosalie K. Hocking, Rahman Daiyan, Antonio Tricoli
Summary: To decrease the cost of hydrogen production and unlock the potential of the hydrogen economy, highly active and durable catalysts for oxygen and hydrogen evolution reactions are needed. This study reports a scalable strategy to prepare doped cobalt oxide electrocatalysts that enhance the activity of these reactions in alkaline conditions. The doping elements increase the bulk conductivity and density of redox active sites without altering the reaction mechanisms. These findings provide insights for engineering Co3O4 as a low-cost material for green hydrogen electrocatalysis at large scales.
Correction
Chemistry, Multidisciplinary
William W. Bennett, Enzo Lombi, Kirk G. Scheckel, Ryo Sekine, Scott G. Johnston, Edward D. Burton, Daryl L. Howard, Peter Kappen, Donald E. Canfield
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Engineering, Environmental
Qian Sun, Edward D. Burton, Dunfeng Si, Tingting Fan, Hu Cheng, Zhenghong Yu, Xiaohou Shao, Peixin Cui, Yujun Wang
Summary: Iron (oxyhydr)oxides and organic matter are closely associated in natural environments, and their fate can be influenced by sulfur cycling. Sulfur preferentially reacts with iron (oxyhydr)oxides to form inorganic sulfur, indirectly affecting the fate of organic matter. During the oxidation stage, previously formed iron (II) species are reoxidized to iron oxides, recapturing released organic matter.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
William W. Bennett, Enzo Lombi, Kirk G. Scheckel, Ryo Sekine, Scott G. Johnston, Edward D. Burton, Daryl L. Howard, Peter Kappen, Donald E. Canfield
Summary: This paper presents the use of synchrotron-based X-ray techniques to investigate the vanadium host phases in ancient marine sediments. The results show that vanadium is mainly present as vanadium (III) hosted by phyllosilicate. Strong associations between vanadium and potassium suggest that vanadium is hosted by potassium-rich clay minerals. Differentiating authigenic and detrital vanadium in ancient marine sediments is unlikely due to similar chemical speciation for both fractions.
ACS EARTH AND SPACE CHEMISTRY
(2023)