Article
Engineering, Environmental
Hangjun Zhang, Bingzhi Yu, Xizi Li, Yan Li, Yuchi Zhong, Jiafeng Ding
Summary: This study investigates the feasibility of using Fe-g-C3N4-activated PDS to remove Microcystis aeruginosa and microcystin-LR. The results demonstrate an efficient removal of the algae and toxin, and singlet oxygen is found to be a predominant radical in the process. The Fe-g-C3N4-activated PDS system is proven to be an environmentally friendly and efficient technology for algae removal and algal toxin reduction.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Xiaoxian Zheng, Xiaojun Niu, Dongqing Zhang, Xingyao Ye, Jinling Ma, Mengyu Lv, Zhang Lin
Summary: This study investigated the feasibility of removing Microcystis aeruginosa by using ubiquitous natural pyrite to activate persulfate. The results showed that the reactive oxygen species generated during the activation process played a key role in facilitating the destabilization of algae cells and the continuous formation of oxidation layers on pyrite surface favored coagulation. The study highlighted the dual role of iron species as both catalyst and coagulant for algae removal, demonstrating the high efficiency and cost-effectiveness of using pyrite/persulfate system.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Ulf Lueder, Bo Barker Jorgensen, Markus Maisch, Caroline Schmidt, Andreas Kappler
Summary: This study investigates the factors influencing the extent of Fe(II) and H2O2 turnover in illuminated aquatic sediments. The results show that the photon flux, wavelength, and availability of Fe(III)-complexing organic molecules play critical roles in the balance between Fe(III) photoreduction and Fe(II) oxidation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Pharmacology & Pharmacy
Jiaojiao Li, Jiayao Wen, Chunxiao Sun, Yuan Zhou, Jun Xu, Hugh J. MacIsaac, Xuexiu Chang, Qinghua Cui
Summary: Cyanobacterial blooms, dominated by Microcystis aeruginosa, pose a serious threat to freshwater ecosystems due to the release of harmful secondary metabolites. Phytosphingosine (PHS), one of the abundant compounds in the blooms, has been found to cause excessive production of reactive oxygen species and mitochondrial damage, leading to cell apoptosis.
Article
Marine & Freshwater Biology
Libin Zhao, Kui Xu, Philippe Juneau, Peihuan Huang, Yingli Lian, Xiafei Zheng, Qiuping Zhong, Wei Zhang, Fanshu Xiao, Bo Wu, Qingyun Yan, Zhili He
Summary: The study found that norfloxacin significantly affects the photosynthetic process of Microcystis aeruginosa, especially under high light conditions; Norfloxacin not only damages the reaction centers of PSII, but also inhibits energy transfer among Microcystis aeruginosa; Additionally, norfloxacin increases the content of reactive oxygen species (ROS) in Microcystis aeruginosa.
AQUATIC TOXICOLOGY
(2021)
Article
Engineering, Environmental
Hui Wang, Guangzhou Qu, Yanshun Gan, Zengqiang Zhang, Ronghua Li, Tiecheng Wang
Summary: This study successfully eliminated M. aeruginosa in water using a self-cooling dielectric barrier discharge plasma reactor, leading to loss of regenerative ability and mineralization of the treated cells. The toxin microcystin-LR initially increased during treatment but later decreased below 1 μg/mL.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Lingxiao Ren, Keqiang Ding, Zhixin Hu, Huiya Wang, Ning Qi, Wei Xu
Summary: The research focused on the mobility of phosphorus in natural waters, with laboratory experiments simulating different hydrodynamic intensity conditions. The results showed that sediment played a crucial role in phosphorus release, especially under stronger hydrodynamic disturbances. The mobility of phosphorus was closely related to redox conditions near the sediment-water interface.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Charlene B. Van Buiten, Guojun Wu, Yan Y. Lam, Liping Zhao, Ilya Raskin
Summary: Fe0 treatment reduces luminal ROS in the gastrointestinal tract, improves metabolic outcomes in obese and hyperglycemic animals, promotes the growth of beneficial bacteria, and suppresses detrimental populations.
FREE RADICAL BIOLOGY AND MEDICINE
(2021)
Article
Engineering, Environmental
Bingzhi Yu, Xizi Li, Mengfan He, Yan Li, Jiafeng Ding, Yuchi Zhong, Hangjun Zhang
Summary: This study investigates the feasibility of using an improved FeCN catalyst to activate PMS and produce 1O2 for the inactivation of harmful cyanobacteria. Adjusting experimental parameters allows for maximum 1O2 yield and efficient inactivation of harmful cyanobacteria and degradation of cyanobacterial toxins. The FeCN-PMS system not only destroys the integrity of cyanobacterial cells but also effectively degrades cyanobacterial toxins, preventing secondary contamination.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Ho Byoung Chae, Min Gab Kim, Chang Ho Kang, Joung Hun Park, Eun Seon Lee, Sang-Uk Lee, Yong Hun Chi, Seol Ki Paeng, Su Bin Bae, Seong Dong Wi, Byung-Wook Yun, Woe-Yeon Kim, Dae-Jin Yun, David Mackey, Sang Yeol Lee
Summary: QSOX1 is a redox sensor that negatively regulates plant immunity by linking reactive oxygen and reactive nitrogen signaling to limit ROS production.
Article
Engineering, Environmental
Chenglong Yu, Yanting Zhang, Yuxi Lu, Ao Qian, Peng Zhang, Yanping Cui, Songhu Yuan
Summary: The presence of ubiquitous humic acid (HA) can enhance the production of hydroxyl radicals during the oxygenation process. This enhancement is related to the chemical composition and electron-accepting capacity of HA. The electron-transfer pathway mediated by HA contributes significantly to the generation of H2O2 and the formation of hydroxyl radicals.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Guoqiang Zhao, Mengxi Tan, Binbin Wu, Xiaoshan Zheng, Ruoxuan Xiong, Baoliang Chen, Andreas Kappler, Chiheng Chu
Summary: Tidal-induced redox oscillations can activate thermodynamically stable iron minerals into a metastable phase for enhanced ROS production.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Liang Zeng, Quan Chen, Yixi Tan, Pinyao Lan, Dandan Zhou, Min Wu, Ni Liang, Bo Pan, Baoshan Xing
Summary: Recent studies show that biochars play a crucial role in mediating the degradation of organic contaminants and can amplify the degradation in a Fenton-like reaction with Fe3+ and persulfate. Different properties of biochars have varying effects on the removal of 2,4-DCP, with the combination of persulfate and Fe3+ significantly promoting the degradation of the contaminant. The direct electron transfer between biochars and 2,4-DCP also contributes significantly to the degradation process.
Article
Engineering, Environmental
Dan Wan, Fei-Fei Liu, Jiu-Bin Chen, Andreas Kappler, Yakov Kuzyakov, Cong-Qiang Liu, Guang-Hui Yu
Summary: The generation of reactive oxygen species (ROS) mediated by minerals and/or microorganisms has a significant impact on carbon and nutrient cycles at soil-water interfaces. Microorganisms primarily drive the production of hydroxyl radical (HO') by modulating iron redox transformation, rather than directly producing ROS. Certain genera, such as Geobacter, Paucimonas, Rhodocyclaceae_K82, and Desulfotomaculum, play a crucial role in HO' production.
Article
Chemistry, Multidisciplinary
Aswin Kottapurath Vijay, Virender K. Sharma, Dan Meyerstein
Summary: Iron(II), Fe-II, plays a crucial role in various natural and biological reactions. Understanding the mechanism and rates of Fe-II oxidation by molecular oxygen (O-2) in the presence of bicarbonate (HCO3-) is essential due to its high concentration in environmental conditions. While previous studies suggested the formation of reactive oxygen species, this study demonstrates the rapid generation of carbonate radicals (CO3 center dot-) in Fe-II oxidation by O-2 in the presence of bicarbonate. The findings highlight the importance of considering CO3 center dot- formation in the geochemical cycling of iron and carbon.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
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
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)
Editorial Material
Engineering, Environmental
Peng Wang, Fernando Rosario-Ortiz, Dan Giammar, Hong He, Greg Lowry, David Waite, Paul Westerhoff, Julie Zimmerman
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)