Article
Biochemistry & Molecular Biology
Davide Vione
Summary: The article discusses the formation and elimination of (NO2)-N-center dot in sunlit surface waters, as well as the influence of nitrate and nitrite on its levels. It was found that the reaction of (NO2)-N-center dot is enhanced in saltwater, which can explain some findings in the literature.
Article
Engineering, Environmental
Yu Zeng, Guodong Fang, Qinglong Fu, Dionysios D. Dionysiou, Xiaolei Wang, Juan Gao, Dongmei Zhou, Yujun Wang
Summary: This study investigated the photochemical processes in paddy water, identifying DOM-D-3*, O-1(2), and OH· as the main reactive intermediates with quantified quantum yields and steady-state concentrations. The findings demonstrated that DOM properties and nitrite concentration were key factors influencing RIs generation, and RIs significantly enhanced arsenite oxidation in paddy water. The study provides new insights into arsenite abiotic transformation pathways in paddy soil and water.
Article
Chemistry, Organic
Harry R. Smallman, Jamie A. Leitch, Tom McBride, Steven Ley, Duncan L. Browne
Summary: Continuous flow systems have unique advantages in the generation and manipulation of sensitive reactive intermediates like ketenes, and various methods have been developed in the past decade for generating ketenes in continuous flow using chemical, thermal, and photochemical activation modes. This article discusses these advancements and the downstream reactivity of ketenes in continuous flow technology.
Article
Engineering, Environmental
Binbin Wu, Chong Zhou, Guoqiang Zhao, Jingyi Wang, Hengyi Dai, Tian Liu, Xiaoshan Zheng, Baoliang Chen, Chiheng Chu
Summary: The wetland soil-water interface (SWI) is found to be an important hotspot for the production of photochemically produced reactive intermediates (PPRIs), which play a critical role in accelerating biogeochemical cycles on earth surface. The enhanced PPRI productions at the SWI are caused by intensified photon absorption and vibrant Fe-mediated redox processes. Nationwide wetland investigations demonstrate that the SWI is a ubiquitous hotspot for PPRI productions. Simulations suggest that the enhanced PPRI productions greatly affect the kinetics and transformation pathways of nutrients and pollutants.
Article
Biochemistry & Molecular Biology
Mahir Rashid, Devora D. Baker, Alexander Greer
Summary: The article discusses the photolysis of a dibenzothiophene sulfoximine, producing reactive intermediates phenyl nitrene and atomic oxygen in tandem. Computational analysis reveals the labile nature of the S-N bond for nitrene release. The potential for future research to explore the release order of O(P-3) and nitrene from sulfoximine scaffolds, as well as the application of molecules with dual-intermediate release in photoaffinity labeling and cellular oxidation, is highlighted.
PHOTOCHEMISTRY AND PHOTOBIOLOGY
(2021)
Article
Engineering, Environmental
Yanling Wang, Binbin Wu, Xiaoshan Zheng, Baoliang Chen, Chiheng Chu
Summary: Black carbon (BC) is photoactive in sunlit waters and atmosphere, producing photochemically produced reactive intermediates (PPRIs). The quantum yields (QYs) assessment of environmentally-relevant PPRIs from different BC samples showed high dependence on incident light wavelength, while BC properties such as pyrolysis temperature and size strongly influenced the QYs of PPRIs. The revealed QYs of BC-derived PPRIs provide a basis for evaluating element cycles and pollutant transformation in natural waters.
Article
Chemistry, Physical
Aleksander V. Mikheylis, Vyacheslav P. Grivin, Victor F. Plyusnin
Summary: The mechanism of photochemical reactions of the xanthate Ni(S2COEt)(2) = Ni(xan)(2) complex in CCl4 was determined using laser flash photolysis.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Engineering, Environmental
Binbin Wu, Tian Liu, Yanling Wang, Guoqiang Zhao, Baoliang Chen, Chiheng Chu
Summary: This study examines the importance of photochemically produced reactive intermediates (PPRIs) in aquatic biogeochemical processes and reveals the significant impact of spectra on their productions. Understanding the spectrum-dependence of PPRI productions can advance our knowledge of biogeochemical processes and pollutant dynamics. These findings emphasize the importance of considering both intensity and spectrum in determining PPRI productions and transformations under varying spatial-temporal and climatic conditions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Ivan D. Sorokin, Oleg Gromov, Vladimir Pergushov, Daria A. Pomogailo, Mikhail Ya Melnikov
Summary: Freon matrices affected the nature of species stabilized upon X-ray irradiation of frozen 1,7-dioxaspiro[5,5]undecane solutions at 77 K, resulting in different products in CF3CCI3 and CFCI3, with the ultimate product being a distonic DOSU radical cation in both matrices.
MENDELEEV COMMUNICATIONS
(2021)
Article
Engineering, Environmental
Fan Li, Zongsu Wei, Ke He, Lee Blaney, Xinquan Cheng, Tianyuan Xu, Wen Liu, Dongye Zhao
Article
Chemistry, Physical
Lisa A. Kelly, Melissa Roll, Jayan Joseph, Jeyaprakashnarayanan Seenisamy, Justin Barrett, Katalin Kauser, Kevin S. Warner
Summary: The solvent-dependent photophysics of two 4-amino-substituted 1,8-naphthalene imides were studied, showing significant differences in fluorescence quantum yields for the dimer compared to the monomer in water. Production of an oxygen-quenchable triplet state and evidence of intramolecular charge transfer were observed, with the results indicating that environmental factors can mediate the photochemistry of these compounds.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Engineering, Environmental
Ethan Hain, Hollie Adejumo, Bridget Anger, Joseph Orenstein, Lee Blaney
Summary: The study optimized bacteria selection and utilized a fluorescent siderophore produced by Pseudomonas fluorescens to assess sublethal effects, improving the sensitivity of residual antimicrobial activity measurements and facilitating the application of bioassays under environmentally relevant conditions.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Crystallography
Brett Setera, Ching-Hua Su, Bradley Arnold, Fow-Sen Choa, Lisa Kelly, Rachit Sood, N. B. Singh
Summary: Chromium- and cobalt-doped zinc selenide nanoparticles were synthesized using a low-temperature reactive solution growth method. The particles agglomerated, but the thioglycerol capping agent helped limit grain growth and agglomeration. This method allows for doping by adding chromium and cobalt salts to the solution.
Review
Environmental Sciences
Monali Priyadarshini, Indrasis Das, Makarand M. Ghangrekar, Lee Blaney
Summary: Advanced oxidation processes (AOPs) are promising technologies for the treatment of contaminants of emerging concern by utilizing highly reactive radicals. Among the evaluated technologies, modified electrochemical oxidation, gamma radiation, and plasma-assisted systems have shown the greatest potential for successful implementation in wastewater treatment.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Yangmo Zhu, Haodong Ji, Ke He, Lee Blaney, Tianyuan Xu, Dongye Zhao
Summary: In this study, a novel adsorptive photocatalyst Bi/TNTs@AC was developed for efficient adsorption and solid-phase photodegradation of GenX. The material mainly consists of activated carbon, anatase, and bismuth nanoparticles with a metallic bismuth core covered by an amorphous Bi2O3 shell. Through analysis and calculations, it was found that Bi/TNTs@AC can degrade GenX into shorter-chain fluorinated compounds through a stepwise defluorination mechanism. The results suggest that Bi/TNTs@AC holds potential for more cost-effective degradation of GenX.
Article
Engineering, Environmental
Utsav Shashvatt, Fabian Amurrio, Lee Blaney
Summary: While many technologies focus on recovering nutrients from liquid waste, this study introduces a new ligand-enabled Donnan dialysis process for effective phosphorus recovery from solid waste.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Hui Chen, Utsav Shashvatt, Fabian Amurrio, Kaylyn Stewart, Lee Blaney
Summary: Donnan dialysis was employed to recover nutrients from model waste solutions and synthetic urine, and a new Donnan dialysis system was established to enhance nutrient recovery. The presence of competing ions in the synthetic urine decreased the removal of orthophosphate and ammonium. The innovative Donnan dialysis system achieved simultaneous recovery of phosphates, ammonium, and other nutrients, and the recovered precipitates were similar to struvite.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Engineering, Environmental
Hui Chen, Michael Rose, Michael Fleming, Sahar Souizi, Utsav Shashvatt, Lee Blaney
Summary: Donnan dialysis technology, with its low chemical and energy consumption, provides significant opportunities for enhancing contaminant removal and resource recovery in water and wastewater treatment. This critical review emphasizes the need for a consistent framework in the design and interpretation of Donnan dialysis systems and evaluates the impacts of solution properties, membrane characteristics, and system configuration. It also discusses the applications of Donnan dialysis for metal, nutrient, and other inorganic and organic chemical treatment and recovery. Recommendations for future studies are provided to address knowledge gaps and promote new opportunities. This critical review serves as an important resource for addressing grand challenges related to clean water and circular economies of essential elements.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Jahir A. Batista-Andrade, Erick Diaz, Diego Iglesias Vega, Ethan Hain, Michael R. Rose, Lee Blaney
Summary: We used fluorescence excitation-emission matrix (EEM) spectroscopy and parallel factor analysis (PARAFAC) to track hotspots of raw wastewater in low- and medium-order urban streams. We proposed that specific ratios of fluorescence components could distinguish when and where untreated wastewater is introduced to urban streams, and this was validated by the detection of contaminants at high concentrations. Based on the data, we identified impacted sites in rural/suburban areas and urban sections affected by sewer issues. The EEM-PARAFAC technique was considered a quick, easy, cost-effective, and scalable method to screen for failing sewer infrastructure in low-order streams.
Article
Environmental Sciences
Pedro J. Martin, Ke He, Lee Blaney, Shakira R. Hobbs
Summary: This study presents a method using FMOC-Cl pre-column derivatization and LC-MS/MS analysis to quantify glyphosate, glufosinate, and AMPA. The optimization of derivatization conditions was conducted and it was found that the inclusion of borate buffer and EDTA addition were critical for complete derivatization. The study provides a robust technique for detecting glyphosate and enhancing understanding of its environmental and human health effects.
Article
Nanoscience & Nanotechnology
Ann M. Kulisiewicz, Sergio J. Garibay, Gabrielle R. Pozza, Matthew A. Browe, Owen Sparr, Sukhvir Singh, Lisa A. Kelly, Jared B. DeCoste
Summary: Metal-organic frameworks (MOFs) have potential in chemical warfare agent (CWA) adsorption and decontamination. NU-1000 has been proven effective in detoxifying sulfur mustard and its simulant 2-CEES via the production of single oxygen under UV or blue light. Variants of NU-1000 with different substituents were synthesized, leading to enhanced reactivity and conjugation between rings. This study provides insight into making materials with enhanced reactivity using visible light.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Ethan Hain, Ke He, Jahir A. Batista-Andrade, Anna Feerick, Mitchell Tarnowski, Anne Timm, Lee Blaney
Summary: This study is the first comprehensive effort to assess the occurrence of emerging contaminants in the Chesapeake Bay. The results revealed varying concentrations of antibiotics, hormones, UV filters, and sucralose at different locations, some of which were associated with wastewater and septic systems.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Chemistry, Analytical
Tielong Wang, Mengmeng Zhong, Meiling Lu, Jun Huang, Lee Blaney, Gang Yu
Summary: The study developed a fully automated method for simultaneous analysis of multiple classes of pesticides or metabolites in drinking water, surface water, and wastewater effluents. The optimized method showed good linearity and high sensitivity in low and high concentration ranges, accurately detecting various pesticides.
ANALYTICAL METHODS
(2021)
Article
Chemistry, Analytical
Mahsa Modiri Gharehveran, Ethan Hain, Lee Blaney, Amisha D. Shah
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2020)