Article
Marine & Freshwater Biology
Jun Xu, Xuexiu Chang, Hugh J. Macisaac, Yuan Zhou, Jingjing Li, Tao Wang, Jinlong Zhang, Jiayao Wen, Daochun Xu, Hongyan Zhang, Runbing Xu
Summary: This study compared the toxicity of exudates from Microcystis at different growth stages to Daphnia magna. The results showed that exudates from cells at stationary growth phase were more toxic than those at exponential phase, and surprisingly, the low-toxicity strain had higher toxicity.
AQUATIC TOXICOLOGY
(2023)
Article
Environmental Sciences
Xiaohui Ren, Jinjie Zhang, Yuqi Huang, Wen Yang, Kaihong Lu, Jinyong Zhu
Summary: This study investigated the response of freshwater gastropod Bellamya aeruginosa to toxic cyanobacterial stress. The results showed changes in the gastropod's gut microbial composition and gut metabolites after exposure to toxic cyanobacteria. The study reveals the underlying mechanisms of gut microbes in the gastropod's adaptation to toxic cyanobacterial stress.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Di Wu, Ting Wang, Jing Wang, Lijuan Jiang, Ying Yin, Hongyan Guo
Summary: The study reveals that 1 μm polystyrene microplastics have a greater impact on freshwater cyanobacteria compared to 100 nm microplastics, promoting algal growth and inhibiting photosynthesis. Additionally, 1 μm microplastics increase intracellular microcystins content and inhibit their release, while 100 nm microplastics only promote microcystin production.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Afang Wang, Yang Shi, Yang Liu, Wei Li, Heng Zhang, Xiaoqiang Dai, Li Luo, Gang Yao, Bo Lai
Summary: The addition of Fe(III) to the Vis/PS system significantly enhances the degradation efficiency of pollutants. Photosensitivity pollutants can boost Fe(III) to produce Fe(II) under visible light irradiation. Fe(III) rapidly combines with LVF in aqueous environments to form Fe(III)-LVF complexes. The production of Fe(IV) in the Vis/PS/Fe(III) system plays a vital role in boosting LVF degradation.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Nanoscience & Nanotechnology
A. Gedsun, S. Antonov, T. S. Prithiv, M. Palm
Summary: The composition of the metastable L21 Heusler phase in Fe2AlX alloys (X = Nb, Ta) was determined using atom probe tomography. It was found that the composition of L21 is off-stoichiometric in both systems, but closer to stoichiometric in Fe-Al-Ta alloy. L21 dissolves faster in Fe-Al-Nb(-B) alloy, leading to quicker formation of the stable C14 Laves phase. Doping with boron does not result in the formation of borides, but slight enrichment of boron at the grain boundary of the Fe-Al matrix covered with C14 precipitates is observed.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Inorganic & Nuclear
Zhi-Jian Ouyang, Xiao-Ying Mo, Jia-Qi Ye, Xiao-Xuan Yu, Shu-Yuan Huang, Xiao-Ling Liu, Wen-Bin Chen, Song Gao, Wen Dong
Summary: Two ion-pair Fe(iii) complexes were synthesized by employing the tridentate ligand H(3)ATD, with one in low-spin state and the other undergoing high temperature spin crossover between 360 and 500 K. The magnetic measurements and magneto-structural relationship studies reveal the crucial role of interactions between the cation and anion in the high temperature Fe(iii) behavior.
DALTON TRANSACTIONS
(2021)
Article
Environmental Sciences
Soukaina El Amrani Zerrifi, El Mahdi Redouane, Richard Mugani, Ines Ribeiro, Maria de Fatima Carvalho, Alexandre Campos, Mustapha Barakate, Vitor Vasconcelos, Brahim Oudra, Fatima El Khalloufi
Summary: The study aimed to investigate the potential of actinobacteria from sediment samples collected from a Moroccan salt river to control harmful cyanobacterial blooms, specifically against Microcystis aeruginosa. Only one of the tested isolates showed promising anti-cyanobacterial activity with significant inhibition of M. aeruginosa growth, chlorophyll-a, and protein content. This research provided insights into the development of a new eco-friendly procedure using actinobacteria for bio-control of toxic cyanobacterial blooms.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Erika L. Addison, Kyle T. Gerlach, Charles D. Spellman, Grace Santilli, Alyson R. Fairbrother, Zachary Shepard, Jeanine D. Dudle, Joseph E. Goodwill
Summary: Fe(VI) as an alternative oxidant can lyse algal cells and potentially further oxidize released organic matter in waters containing Microcystis aeruginosa. Fe(VI) pre-oxidation may help decrease the formation of nitrogenated disinfection byproducts. However, further research is needed to understand the fate of the resulting organic matter when using Fe(VI) in treatment processes.
Article
Biophysics
Xiaochao Bi, Decai Liu, Lu Wang, La Rao, Ming-Lai Fu, Wenjie Sun, Baoling Yuan
Summary: The effects of ionic strength and pH on the deposition kinetics of bacteriophage MS2 on organic and inorganic surfaces were investigated. High Na+ concentration increased the deposition rates of MS2, while high Ca2+ concentration decreased the deposition rates. Additionally, the highest deposition rates occurred at pH 3, and the rates were higher on the kaolin-coated surface compared to the Microcystis-coated surface.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2022)
Article
Chemistry, Multidisciplinary
L. H. Zhang, M. J. Cheng, X. H. Shi, J. W. Shuai, Z. Z. Zhu
Summary: The importance of martensitic transformations has led to extensive research on the microscopic transition paths, particularly in the γ -> α transition of Fe. Monitoring the microscopic phase transition mechanisms in experiments is challenging, so it may be helpful to realize only one of the paths in a physical process.
Article
Environmental Sciences
Karolina Czarny, Barbara Krawczyk, Dominik Szczukocki
Summary: The toxic effects of bisphenol analogues, both individually and in combination, on cyanobacteria need further investigation. Different bisphenol analogues exhibit varying levels of toxicity to cyanobacteria, with mixtures potentially showing stronger toxic effects than bisphenol A.
Article
Engineering, Environmental
Xiaolong Yang, Yonghong Bi, Xiaofei Ma, Wei Dong, Xun Wang, Shoubing Wang
Summary: The study highlights the physiological and transcriptomic changes of Microcystis aeruginosa supplied with different nitrogen forms (nitrate and ammonium). The results show that ammonium stimulates initial growth better than nitrate, but excess absorbed light energy under high ammonium leads to cellular damage. Adequate nitrate supply promotes efficient photosynthesis and higher biomass yield. The different nitrogen forms also induce different transcriptomic patterns in M. aeruginosa. These findings provide important clues for understanding the effects of nitrogen forms on cyanobacterial outbreaks.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Multidisciplinary Sciences
Ferdi L. Hellweger, Robbie M. Martin, Falk Eigemann, Derek J. Smith, Gregory J. Dick, Steven W. Wilhelm
Summary: This study conducted a large-scale meta-analysis and found that the succession of harmful cyanobacteria strains is mainly influenced by cellular oxidative stress mitigation strategies and nitrogen limitation. The simulation results showed that reducing phosphorus load can decrease the biomass of cyanobacteria, but increase toxin production and concentration.
Article
Environmental Sciences
Na Lu, Yunfei Sun, Junjun Wei, Lei Gu, Lu Zhang, Zhou Yang, Yuan Huang
Summary: The study indicates that toxic cyanobacteria have different effects on adaptive predator-induced responses in zooplankton, affecting growth and reproduction under the interaction of high-quality diets and predator cues. Resource allocation to antipredator morphological defense remains unchanged, but somatic growth and reproduction are affected by toxic cyanobacteria in zooplankton.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Yueheng Zhang, Qing Gao, Shu-shen Liu, Liang Tang, Xin-Gui Li, Haoyu Sun
Summary: Quinolones, dechloranes, and chlorinated paraffins are new types of halogenated organic pollutants that come from flame retardants, lubricants, and pesticides. This study investigates the toxic effects of these pollutants on cyanobacteria, particularly Microcystis aeruginosa, and finds that quinolones and dechloranes have hormetic effects on their proliferation, while chlorinated paraffins do not. The joint toxicity tests show that mixtures of quinolones & chlorinated paraffins and dechloranes & chlorinated paraffins also exhibit hormetic effects on Microcystis aeruginosa. However, mixtures of quinolones & dechloranes do not have a hormetic effect. It is also found that mixtures of quinolones & dechloranes have synergistic toxic actions, while the joint toxic actions of both quinolones & chlorinated paraffins, and dechloranes & chlorinated paraffins shift from addition to antagonism with increasing concentration. The study provides important data and mechanisms for understanding the hormetic phenomenon of these pollutants on Microcystis aeruginosa and highlights the role of hormesis in the risk assessment of environmental pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Jiangzhou Xie, Jieli Xie, Christopher J. Miller, T. David Waite
Summary: Iron complexes of tetra-amido macrocyclic ligands (Fe-TAML) are effective catalysts for the degradation of organic contaminants, with the high valent Fe(IV) and Fe(V) species generated by activation with hydrogen peroxide (H2O2). This study explores the use of an electrode attached Fe-TAML complex to generate high valent iron species at the anode, resulting in enhanced stability and improved oxidation rates. The application of this carbon black-supported Fe-TAML suspension anode reactor shows significantly higher oxidation rates and lower energy consumption compared to alternate technologies.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Xiaofan Yang, Changyong Zhang, Xinran Zhang, Shaoyu Deng, Xiang Cheng, T. David Waite
Summary: This study investigated the crystallization of vivianite in the presence of dissolved oxygen (DO) at pHs 5-7. The results showed that DO had a significant impact on the crystallization process, which was highly pH-dependent. At pH 5, slow crystallization with highly crystalline vivianite was observed, but the P removal efficiency was only 30-40%. At pH 6 and 7, the removal of P from the solution was more effective (to >90%), but the efficiency decreased when FeII oxidation became more severe.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yufan Chen, Christopher J. Miller, Jieli Xie, T. David Waite
Summary: In this study, it was found that the oxidation products of methyl phenyl sulfoxide (PMSO) enhance the formation of methyl phenyl sulfone (PMSO2) by complexing with Fe(III) species. This finding suggests caution in using PMSO to investigate the role of ferryl ion ([(FeO)-O-IV](2+)) in iron-based advanced oxidation processes (AOPs). Additionally, other target compounds were found to modify the reactivity of iron species through complexation and/or redox reactions. Overall, this study highlights the confounding effects of aromatic probe compounds on the reactivity of iron species in AOPs.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Xiangtong Kong, Shikha Garg, Mahshid Mortazavi, Jinxing Ma, T. David Waite
Summary: This study presents the preparation and performance of an Al2O3-supported Fe catalyst for heterogeneous catalytic ozonation (HCO). The NS-Fe-Al2O3 catalyst demonstrated significantly improved removal of organic pollutants compared to conventional catalysts. It also exhibited resistance to inhibitory effects of chloride and sulfate ions commonly found in industrial effluents.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Ziqi Zhou, Qing-Long Fu, Manabu Fujii, T. David Waite
Summary: This study developed a novel automated formula assignment algorithm for ESI(+)-FT-ICR MS spectra to elucidate the composition of dissolved organic matter (DOM) in groundwater rich in Fe(II). The results not only shed light on the further algorithm development for comprehensive characterization of DOM by ESI(-)-FT-ICR MS and ESI(+)-FT-ICR MS but also highlight the importance of appropriate treatment of specific groundwater prior to use.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Mahshid Mortazavi, Shikha Garg, T. David Waite
Summary: In this study, we investigated the effects of H2O2 dosage, H2O2 dosing method, and electron-rich dissolved organic matter (DOM) on the peroxone (O3/H2O2) process. We found that the dosing method of H2O2 had a significant impact on the removal of oxalate (OA), with continuous injection of 1 mM H2O2 achieving nearly 100% OA removal after 1 hour. Additionally, the presence of high concentrations of humic acids (HA) enhanced the oxidation rate of OA by ozone alone. Based on our findings, we developed a mathematical model that predicts the generation of center dot OH and OA oxidation in the peroxone process, which can be used to optimize operating conditions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Environmental Sciences
Yuyang Sun, Shikha Garg, Changyong Zhang, Jiangzhou Xie, T. David Waite
Summary: In this study, the efficiency of five cathode materials (carbon felt, titanium plate, graphite plate, copper plate, and stainless-steel plate) in recovering nickel was investigated. The highest Ni removal efficiency of 81.6% was achieved with the carbon felt cathode, which was 30% higher than that of the titanium cathode. The chemical composition of the deposits was independent of the cathodic material, but the morphology of deposition varied with the cathode material. The accumulated Ni on the carbon felt surface was successfully recovered either as a nickel salt solution by acid leaching or as high purity NiO by calcinating the Ni-loaded carbon felt cathode at over 800°C. The regenerated carbon felt showed comparable performance to the fresh cathode even after 10 cycles of use and regeneration, confirming its stability and reusability.
Article
Engineering, Environmental
Jingyi Sun, Shikha Garg, T. David Waite
Summary: A novel three-chambered flow electrode unit is proposed for continuous nitrate removal and ammonia generation from nitrate contaminated groundwater, without the need for additional chemicals or electrolytes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Clare Bales, Andrew S. S. Kinsela, Christopher Miller, Yuan Wang, Yunyi Zhu, Boyue Lian, T. David Waite
Summary: The performance of membrane capacitive deionization (MCDI) for the removal of uranium from groundwater was studied. It was found that MCDI can remove up to 98.9% of uranium from groundwater containing 50 μg/L uranium, with most of it retained on the anode. Uranium was found to adsorb to the electrode through physiochemical processes without the application of a potential. A portion of the uranium remained on the electrodes after brine discharge, and conventional cleaning techniques were unable to remove it.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Lei Wu, Shikha Garg, Jiangzhou Xie, Changyong Zhang, Yuan Wang, T. David Waite
Summary: The study investigates the treatment of solutions containing Cu/Ni-EDTA complexes using an electrochemical process. The results show that Cu-EDTA is decomplexed and subsequently electrodeposited as Cu(0) at the cathode, while the reduction of Ni-EDTA at the cathode is insignificant. Ni removal mainly occurs through anodic oxidation of EDTA in Ni-EDTA, resulting in the release of Ni2+ and subsequent deposition as Ni(0) on the cathode. A kinetic model describing the key reactions in the electrolysis process satisfactorily explains the removal of EDTA, Cu, Ni, and TOC.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Mathias L. L. Skavenborg, Mads Sondrup Moller, Susanne Mossin, T. David Waite, Christine J. J. McKenzie
Summary: Heteroleptic copper complexes of an asymmetrical pincer ligand containing a central anionic sulfonamide donor have been prepared and shown to catalyze the electro-reduction of O2 to H2O2. The addition of a weak organic acid increases the reaction rate and the coulombic efficiency of H2O2 production was determined to be 48% by iodometric titration.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Mathias L. Skavenborg, Mads Sondrup Moller, Christopher J. Miller, Johan Hjelm, T. David Waite, Christine J. Mckenzie
Summary: This study investigates the catalytic activity of copper complexes in the oxygen reduction reaction by modifying the structure of the ligands. The results show that copper complexes with one carboxylate donor exhibit high activity in neutral aqueous conditions. The turnover frequencies are comparable to traditional copper complexes. Additionally, the study reveals that the Lewis acidity of copper ions also influences other ligands in the solution.
INORGANIC CHEMISTRY
(2023)
Article
Engineering, Environmental
Zhizhao He, Yingnan Li, Yuan Wang, Christopher J. Miller, John Fletcher, Boyue Lian, T. David Waite
Summary: This study evaluates the desalination performance of MCDI using feed solutions with different levels of hardness. It is found that the increase of hardness leads to performance degradation. The performance can be improved by reducing the current and discharging the cell to a negative potential.
Article
Engineering, Environmental
Yuyang Sun, Shikha Garg, Changyong Zhang, Boyue Lian, T. David Waite
Summary: In this study, an electrochemical advanced oxidation process (EAOP) was used to effectively degrade Ni-EDTA complexes in electroless nickel plating wastewaters. The degradation of NiEDTA complexes occurred at/near the anode surface via interaction with hydroxyl radicals generated on water splitting. The rate of Ni-EDTA degradation was controlled by the rate of transport of Ni-EDTA to the anode surface.
ACS ES&T ENGINEERING
(2023)
Article
Engineering, Environmental
Boyue Lian, Yuyang Sun, Yuan Wang, Shikha Garg, Changyong Zhang, Yong Chen, Yong Tu, T. David Waite
Summary: Anodic oxidation is an effective technology for the degradation of contaminants in wastewater. A three-dimensional computational fluid dynamics (CFD) model was developed to investigate the flow behavior and concentration profiles of Ni-EDTA complexes during anodic oxidation. The results showed that reducing the electrode aperture size enhanced the degradation rate, and a woven electrode exhibited the highest performance. This study provides insights for the optimization of anode design and reactor operation in electrochemical advanced oxidation processes.
ACS ES&T ENGINEERING
(2023)
