A5024271260- Spectroscopy and Chemometric Analyses
- Spectroscopy Techniques in Biomedical and Chemical Research
- Microplastics and Plastic Pollution
- Recycling and Waste Management Techniques
- NMR spectroscopy and applications
- Marine and coastal ecosystems
- Analytical Chemistry and Chromatography
- Advanced oxidation water treatment
- Water Quality Monitoring and Analysis
- Fault Detection and Control Systems
- Photodynamic Therapy Research Studies
- Innovative Microfluidic and Catalytic Techniques Innovation
- Iron oxide chemistry and applications
- Environmental Toxicology and Ecotoxicology
- Arsenic contamination and mitigation
- Nanoplatforms for cancer theranostics
- Advanced NMR Techniques and Applications
- Porphyrin and Phthalocyanine Chemistry
- Heavy metals in environment
- Mass Spectrometry Techniques and Applications
- Biosensors and Analytical Detection
- Advanced Chemical Sensor Technologies
- Viral Infectious Diseases and Gene Expression in Insects
- Advanced MRI Techniques and Applications
- Marine Biology and Ecology Research
Federal Institute For Materials Research and Testing
2013-2024
Fraunhofer Institute for Manufacturing Technology and Advanced Materials
2016-2024
Klinikum Region Hannover
2022-2024
Indian Association for the Cultivation of Science
2018-2021
Bar-Ilan University
2021
National University of General Sarmiento
2019
University of Freiburg
2018
Leibniz Institute of Freshwater Ecology and Inland Fisheries
2003-2013
Leibniz Association
2004-2011
Indian Institute of Science Bangalore
2011
Summary 1. This review focuses on direct and indirect interactions between dissolved humic substances (HS) freshwater organisms presents novel opinions hypotheses their ecological significance. Despite abundance in freshwaters, the role of HS is still inadequately understood. These have been considered too large to be taken up by organisms. On contrary, here we present evidence that are indeed interact directly and/or indirectly with 2. We show exert a mild chemical stress upon aquatic many...
Arsenic is a redox-active metalloid whose toxicity and mobility strongly depends on its oxidation state, with arsenite (As(III)) being more toxic mobile than arsenate (As(V)). Humic substances (HS) are also can potentially react arsenic change redox state. In this study we show that semiquinone radicals produced during microbial or chemical reduction of HS model quinone (AQDS, 9,10-anthraquinone-2,6-disulfonic acid) strong oxidants. They oxidize to arsenate, thus decreasing As mobility. This...
Dissolved natural organic matter (NOM) plays an essential role in freshwater geochemical and biochemical processes. A major property, its redox behavior, can be attributed to the chinone building blocks, which form stable radicals. However, electron paramagnetic resonance (EPR) data indicating free radicals on solid NOM are sparse. Here we present EPR spectra of 23 from European surface waters isolated by reverse osmosis. The radical concentrations ranged 5 × 1015 1.84 1017 spins g-1, g...
Modular plants using intensified continuous processes represent an appealing concept for the production of pharmaceuticals. It can improve quality, safety, sustainability, and profitability compared to batch processes; besides, it enables plug-and-produce reconfiguration fast product changes. To facilitate this flexibility by real-time quality control, we developed a solution that be adapted quickly new is based on compact nuclear magnetic resonance (NMR) spectrometer. The NMR sensor...
Abstract Near-infrared (NIR) spectroscopy is a promising candidate for low-cost, nondestructive, and high-throughput mass quantification of microplastics in environmental samples. Widespread application the technique currently hampered mainly by low sensitivity NIR compared to thermoanalytical approaches commonly used this type analysis. This study shows how can be extended smaller analyte levels combining it with simple rapid microplastic enrichment protocol. For purpose, widely flotation...
Fenton-like processes using persulfate for oxidative water treatment and contaminant removal can be enhanced by the addition of redox-active biochar, which accelerates reduction Fe(III) to Fe(II) increases yield reactive species that react with organic contaminants. However, available data on formation non-radical or radical in biochar/Fe(III)/persulfate system are inconsistent, limits evaluation efficiency applicability different matrices. Based competition kinetics calculations, we...
Hyperspectral imaging of environmental samples with infrared microscopes is one the preferred methods to find and characterize microplastics.
With the drastic increase in plastic production, input of particles into environment has become a recognised problem. Xenobiotics are able to sorb polymer materials, and this process is further enhanced where they encounter microplastics (plastic fragments <5 mm). In work we studied sorption metformin, type-2 diabetes drug, difenoconazole, fungicide, onto virgin materials polyamide (PA), polypropylene (PP), polystyrene (PS). Additionally, PP was cryo-milled PA treated with acid investigate...
Abstract The catalytic behavior of iron phthalocyanine (FePc)-sensitized magnetic nanocatalysts was evaluated for their application in the oxidative treatment Bisphenol A (BPA) under mild environmental conditions. Two types FePc (Fe(II)Pc and Fe(III)Pc), which are highly photosensitive compounds, were immobilized on surface functionalized magnetite. nanomaterials characterized by high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), Fourier transform infrared...
In aquatic systems, natural organic matter (NOM) and in particular humic substances effectively absorb the ultraviolet (UV)/visible light spectrum of solar radiation act as a photoprotective filter for organisms. Simultaneously, UV contributes to generation potentially harmful reactive oxygen species (ROS). Dose–response experiments were conducted on cyanobacteria green algae with hydrogen peroxide (H2O2) long-lived representative ROS. Delayed fluorescence (DF) decay kinetics was used...
Medium-resolution nuclear magnetic resonance spectroscopy (MR-NMR) currently develops to an important analytical tool for both quality control and process monitoring. In contrast high-resolution online NMR (HR-NMR), MR-NMR can be operated under rough environmental conditions. A continuous re-circulating stream of reaction mixture from the vessel spectrometer enables a non-invasive, volume integrating analysis reactants products. Here, we investigate esterification 2,2,2-trifluoroethanol with...
The transformation of a base-catalyzed, mechano-assisted Knoevenagel condensation mono-fluorinated benzaldehyde derivatives ( p -, m o -benzaldehyde) with malonodinitrile was investigated in situ and real time. Upon milling, the para -substituted product found to crystallize initially into two different polymorphic forms, depending on quantity catalyst used. For low concentrations, mechanically metastable phase (monoclinic) formed, converting stable (triclinic) upon further grinding....