Article
Engineering, Environmental
Astolfo Valero, Jiri Jan, Daniel A. A. Petrash
Summary: This study demonstrates the efficient removal of arsenite from water using a bioelectrochemical system (BES) with the help of redox reactive humic substances derivatives and reactive nitrogen species. Geobacter sp. utilizes humic derivatives as electron shuttles, facilitating the reduction of Fe(iii) and the scavenging of As(iii). These findings contribute to the development of effective BESs for arsenite removal.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Tingting Li, Qian Wang, Chang Zhu, Xiaoxiao Huang, Gang Yang
Summary: The reduction of U(VI) to less soluble U(IV) species on mineral surfaces is a promising approach for remediating uranium contamination. Fe(II) is found to play a more reactive role than humic acid (HA) in this reduction process, and the extent of U(VI) reduction is determined by the Fe(II) content (n). When both HA and Fe(II) are present, two distinct mechanisms are observed: spectator mode, where only one acts as a reducing agent, and combined action mode, where both contribute to the reduction process.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Environmental
Huali Yu, Guangfei Liu, Ruofei Jin, Jiti Zhou
Summary: This study investigated the catalytic degradation of sulfanilamide using goethite and HA (Gt-HA) coprecipitates with different C:Fe molar ratios. The Gt-HA system with optimal C:Fe ratio of 0.30 showed higher efficiency in degrading sulfanilamide compared to the control Gt system, with improved H2O2 activation and center dot OH production. Additionally, the study demonstrated the potential of developing Fe-C coprecipitates as efficient catalysts in Fenton-like processes.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Geochemistry & Geophysics
Hailiang Dong, Ethan S. Coffin, Yizhi Sheng, Matthew L. Duley, Yehia M. Khalifa
Summary: This study investigates the role of biochar in Fe redox cycling through bioreduction experiments. The concentration of biochar affects the reduction rate and extent of Fe(III). The presence of biochar creates two pathways for electron transfer, and the electron shuttling role of biochar enhances the rate of Fe(III) bioreduction. However, high concentration of biochar can impair both pathways and inhibit Fe(III) bioreduction.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Engineering, Environmental
Xiaofang Shen, Weihong Dong, Yuyu Wan, Yu Liu, Zhijiang Yuan
Summary: This study focuses on the adsorption of naphthalene on montmorillonite-humic acid and chlorite-humic acid complexes. The results show that Fe(III) plays a significant role in the adsorption process, which is influenced by the organic matter content.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Erdan Hu, Meichen Liu, Feng Wang, Bosheng Lv, Jun Wu
Summary: The effects of phosphate, silicate, humic acid, and calcium on the release of As(V) co-precipitated with Fe(III) and Fe(II) during aging were investigated. Silicate and humic acid caused notable release of As(V) while phosphate and calcium promoted As(V) removal efficiency. These results are important for the treatment of As(V) contaminated groundwater.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Liqiang Yan, Jishuai Bing, Hecheng Wu
Summary: Iron and titanium doped gamma-Al2O3 mesoporous catalysts were synthesized by self-assembly, applied to ozonation of ibuprofen in bromide-containing water, effectively enhancing ibuprofen removal and blocking bromate formation.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Engineering, Environmental
Jinbin Lin, Yuye Hu, Junyang Xiao, Yixin Huang, Mengyun Wang, Haoyu Yang, Jing Zou, Baoling Yuan, Jun Ma
Summary: Introduced ABTS as an electron shuttle in Fe(II)/PAA process significantly enhanced the oxidation capacity and efficiency for diclofenac elimination. ABTS(.+) was identified as the primary reactive species responsible for diclofenac degradation in the presence of Fe(II) and PAA, although other reactive species like (FeO2+)-O-IV and R-O-. also existed. The study proposed two possible degradation pathways of diclofenac and demonstrated the potential application of ABTS/Fe(II)/PAA process in water treatment for micropollutant removal.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Bo Yang, Xin Cheng, Yongli Zhang, Wei Li, Jingquan Wang, Zixin Tian, Erdeng Du, Hongguang Guo
Summary: This study revealed the mechanism of humic acid in enhancing water decontamination through the H2O2-Fe(III) process in stages, by promoting the redox cycle of Fe(III)/Fe(II) and enhancing pH tolerance.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Geochemistry & Geophysics
Yuan Liu, Shengbao Shi, Qiang Zeng, Yang Li, Yu Chen, Dongyi Guo, Dafu Hu, Hailiang Dong
Summary: This study investigates the bio-reduction of structural Fe(III) in clay minerals by the iron-reducing bacterium Shewanella putrefaciens CN32. It finds that compounds in crude oil, particularly the saturated and aromatic fractions, can serve as electron donors and shuttle, facilitating the reduction of Fe(III) in clay minerals. The presence of lactate as an additional electron donor enhances the bio-reduction process, especially for the aromatic fraction. These findings have important implications for the coupled biogeochemical cycles of carbon and iron in oil reservoirs.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Environmental Sciences
Yujie Zhang, Shikang Wu, Peizhe Sun
Summary: Determining the conditional stability constant (Kcond) is crucial for assessing the stability of Fe(III) complexes in surface water and wastewater. This study evaluated existing methods of Kcond determination and proposed a novel UV-Vis spectroscopy method. The results showed that Fe(III)-EDTA had the highest logKcond value (7.08), followed by Fe(III)-NTA (4.67), Fe(III)-OA (4.32), Fe(III)-TTC (4.28), and Fe(III)-Kana (3.07). The method was also applied to Fe(III) complexation with humic acid (HA), yielding a logKcond value of 5.02 M-1. The proposed methodology demonstrated satisfactory measurement capability for a wide range of complexes (103 to 107 M-1). Insights into the impact of Fe(III) complexes in water matrices can be gained using this method.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Analytical
Hong-Li Ye, Yue Shang, Hai-Yan Wang, Yan-Li Ma, Xi-Wen He, Wen-You Li, Yu-Hao Li, Yu-Kui Zhang
Summary: A novel method for determining Fe(III) in biological samples was developed using water-soluble silicon nanoparticles (SiNPs) with strong fluorescence properties. The mechanism involved electron transfer and showed low detection limits and high precision, making it suitable for applications in various environmental waters and human serum.
Article
Microbiology
Toshiyuki Ueki, Trevor L. Woodard, Derek R. Lovley
Summary: This study developed a method for genetic manipulation of Desulfovibrio ferrophilus and found that it primarily reduces Fe(III) oxide through an electron shuttle. This finding not only helps to elucidate the mechanisms of D. ferrophilus, but also provides a new experimental approach for studying its other unique features.
MICROBIOLOGY SPECTRUM
(2022)
Article
Chemistry, Inorganic & Nuclear
Yun Ji Park, Marconi N. Penas-Defrutos, Michael J. Drummond, Zachary Gordon, Oscar R. Kelly, Ian J. Garvey, Kelly L. Gullett, Max Garcia-Melchor, Alison R. Fout
Summary: In this study, the modification of the secondary coordination sphere in the non-heme iron system was explored to investigate the mechanism of nitrite reduction. The results showed that changing the secondary coordination sphere can alter the formation of iron-oxo and iron-hydroxo complexes, highlighting the key role of H-bonds in the stability of these species.
INORGANIC CHEMISTRY
(2022)
Article
Engineering, Environmental
Limin Zhang, Yu Chen, Qingyin Xia, Kenneth M. Kemner, Yanghao Shen, Edward J. O'Loughlin, Zezhen Pan, Qihuang Wang, Ying Huang, Hailiang Dong, Maxim Boyanov
Summary: This study examines the bioreduction of U(VI) by Shewanella putrefaciens strain CN32 in the presence of clay minerals and organic ligands. The presence of ligands enhanced the rate of U(VI) bioreduction, with Fe(III)-bearing clays playing a crucial role in the stability of the resulting U(IV) phase. Organic ligands were found to significantly affect the microbial reduction of U(VI) and the formation of soluble U(IV) complexes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
