Lenz, Markus
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Lenz, Markus
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- PublikationMethodological approaches for fractionation and speciation to estimate trace element bioavailability in engineered anaerobic digestion ecosystems: An overview(Taylor & Francis, 16.09.2016) van Hullebusch, Eric D.; Guibaud, Gilles; Simon, Stéphane; Lenz, Markus; Yekta, Sepehr Shakeri; Fermoso, Fernando G.; Jain, Rohan; Duester, Lars; Roussel, Jimmy; Guillon, Emmanuel; Skyllberg, Ulf; Almeida, C. Marisa R.; Pechaud, Yoan; Garuti, Mirco; Frunzo, Luigi; Esposito, Giovanni; Carliell-Marquet, Cynthia; Ortner, Markus; Collins, Gavin [in: Critical Reviews in Environmental Science and Technology]01A - Beitrag in wissenschaftlicher Zeitschrift
- PublikationEnvironmental aspects of printable and organic electronics (POE)(Pan Stanford Publishing, 04/2016) Hengevoss, Dirk; Zimmermann, Yannick; Brun, Nadja; Hugi, Christoph; Lenz, Markus; Corvini, Philippe; Fent, Karl; Nisato, Giovanni; Lupo, Donald; Ganz, Simone [in: Organic and Printed Electronics: Fundamentals and Applications]04A - Beitrag Sammelband
- PublikationIncineration of organic solar cells: Efficient end of life management by quantitative silver recovery(Royal Society of Chemistry, 2016) Sondergaard, Roar R.; Zimmermann, Yannick; Lenz, Markus; Krebs, Frederik; Martinez Espinosa, Nieves [in: Energy & Environmental Science]Recovery of silver from the electrodes of roll-to-roll processed org. solar cells after incineration has been performed quant. by extn. with nitric acid. This procedure is more than 10 times faster than previous reports and the amt. of acid needed for the extn. is reduced by a factor of 100-150. LCA studies show that the resulting environmental impacts from silver extn. of incinerated ashes are more favorable on almost all std. factors compared to extn. from shredded org. solar cells. The so lessened environmental impacts by efficient recovery fully justify the use of Ag as an electrode in scaled prodn. of org. solar cells.01A - Beitrag in wissenschaftlicher Zeitschrift
- PublikationOutdoor fate and environmental impact of polymer solar cells through leaching and emission to rainwater and soil(Royal Society of Chemistry, 2016) Martinez Espinosa, Nieves; Zimmermann, Yannick; dos Reis Benatto, Gisele A.; Lenz, Markus; Krebs, Frederik [in: Energy & Environmental Science]The emission of silver and zinc to the aq. environment (rain, fog, dew) from polymer solar cells installed outdoors is presented. Studies included pristine solar cells and solar cells subjected to mech. damage under natural weather conditions in Denmark. We find the emission of silver and zinc to the environment through pptd. water for damaged solar cells, and also obsd. failure and emission from an initially undamaged device in an expt. that endured for 6 mo. In the case of the damaged cells, we found that the drinking water limits for Ag were only exceeded on a few single days. We also progressed our studies to include end-of-life management. To assess the implications of improper practices (uncontrolled disposal, landfilling) at the end-of-life, we buried different OPV types in intact and damaged forms in soil columns. In the case of high Ag emission (shredded cells), the potential for migration was confirmed, even though the soil was found to exhibit sequestration of silver. We conclude that recycling of Ag at the end-of-life is mandatory from an environmental point of view.01A - Beitrag in wissenschaftlicher Zeitschrift
- PublikationImmobilization of an artificial imine reductase within silica nanoparticles improves its performance(Royal Society of Chemistry, 2016) Hestericová, Martina; Correro, Maria Rita; Lenz, Markus; Corvini, Philippe; Shahgaldian, Patrick; Ward, Thomas R. [in: Chemical Communications]Silica nanoparticles equipped with an artificial imine reductase (biotinylated iridium complex conjugated with streptavidin) display marked redn. activity toward cyclic imines and NAD. The method, based on immobilization and protection of streptavidin on silica nanoparticles, shields the biotinylated metal cofactor against deactivation yielding >46,000 turnovers in pure samples and 4000 turnovers in crude cellular exts.01A - Beitrag in wissenschaftlicher Zeitschrift
- PublikationArsenic Mobilization from Historically Contaminated Mining Soils in a Continuously Operated Bioreactor: Implications for Risk Assessment(Taylor & Francis, 2016) Rajpert, Liwia; Kolvenbach, Boris; Ammann, Erik; Hockmann, Kerstin; Nachtegaal, Maarten; Eiche, Elisabeth; Schäffer, Andreas; Corvini, Philippe; Sklodowska, Aleksandra; Lenz, Markus [in: Environmental Science & Technology]Concentrations of soil arsenic (As) in the vicinity of the former Złoty Stok gold mine (Lower Silesia, southwest Poland) exceed 1000 μg g–1 in the area, posing an inherent threat to neighboring bodies of water. This study investigated continuous As mobilization under reducing conditions for more than 3 months. In particular, the capacity of autochthonic microflora that live on natural organic matter as the sole carbon/electron source for mobilizing As was assessed. A biphasic mobilization of As was observed. In the first two months, As mobilization was mainly conferred by Mn dissolution despite the prevalence of Fe (0.1 wt % vs 5.4 for Mn and Fe, respectively) as indicated by multiple regression analysis. Thereafter, the sudden increase in aqueous As[III] (up to 2400 μg L–1) was attributed to an almost quintupling of the autochthonic dissimilatory As-reducing community (quantitative polymerase chain reaction). The aqueous speciation influenced by microbial activity led to a reduction of solid phase As species (X-ray absorption fine structure spectroscopy) and a change in the elemental composition of As hotspots (micro X-ray fluorescence mapping). The depletion of most natural dissolved organic matter and the fact that an extensive mobilization of As[III] occurred after two months raises concerns about the long-term stability of historically As-contaminated sites.01A - Beitrag in wissenschaftlicher Zeitschrift
- PublikationAntimony retention and release from drained and waterlogged shooting range soil under field conditions(Elsevier, 09/2015) Hockmann, Kerstin; Tandy, Susan; Lenz, Markus; Reiser, Rene; Conesa, Hector; Keller, Martin; Studer, Björn; Schulin, Rainer [in: Chemosphere]Many soils polluted by antimony (Sb) are subject to fluctuating waterlogging conditions; yet, little is known about how these affect the mobility of this toxic element under field conditions. Here, we compared Sb leaching from a calcareous shooting range soil under drained and waterlogged conditions using four large outdoor lysimeters. After monitoring the leachate samples taken at bi-weekly intervals for >1.5 years under drained conditions, two of the lysimeters were subjected to waterlogging with a water table fluctuating according to natural rainfall water infiltration. Antimony leachate concentrations under drained conditions showed a strong seasonal fluctuation between 110 μg L−1 in summer and <40 μg L−1 in winter, which closely correlated with fluctuations in dissolved organic carbon (DOC) concentrations. With the development of anaerobic conditions upon waterlogging, Sb in leachate decreased to 2–5 μg L−1 Sb and remained stable at this level. Antimony speciation measurements in soil solution indicated that this decrease in Sb(V) concentrations was attributable to the reduction of Sb(V) to Sb(III) and the stronger sorption affinity of the latter to iron (Fe) (hydr)oxide phases. Our results demonstrate the importance of considering seasonal and waterlogging effects in the assessment of the risks from Sb-contaminated sites.01A - Beitrag in wissenschaftlicher Zeitschrift
- PublikationBiotechnologies for Critical Raw Material Recovery from Primary and Secondary Sources: R&D Priorities and Future Perspectives(Elsevier, 25.01.2015) Hennebel, Tom; Boon, Nico; Maes, Synthia; Lenz, Markus [in: New Biotechnology]Europe is confronted with an increasing supply risk of critical raw materials. These can be defined as materials of which the risks of supply shortage and their impacts on the economy are higher compared to most of other raw materials. Within the framework of the EU Innovation Partnership on raw materials Initiative, a list of 14 critical materials was defined, including some bulk metals, industrial minerals, the platinum group metals and rare earth elements. To tackle the supply risk challenge, innovation is required with respect to sustainable primary mining, substitution of critical metals, and urban mining. In these three categories, biometallurgy can play a crucial role. Indeed, microbe-metal interactions have been successfully applied on full scale to win materials from primary sources, but are not sufficiently explored for metal recovery or recycling. On the one hand, this article gives an overview of the microbial strategies that are currently applied on full scale for biomining; on the other hand it identifies technologies, currently developed in the laboratory, which have a perspective for large scale metal recovery and the needs and challenges on which bio-metallurgical research should focus to achieve this ambitious goal.01A - Beitrag in wissenschaftlicher Zeitschrift
- PublikationFeasibility for critical raw material recovery from Hungarian red muds of different origin(2015) Ujaczki, Eva; Zimmermann, Yannick; Feigl, Victoria; Lenz, Markus06 - Präsentation
- PublikationEvaluation of two Reuse Technologies for a Hungarian Red Mud(2015) Lenz, Markus; Ujaczki, Eva; Zimmermann, Yannick; Molnar, Monika; Gruiz, Katalin; Feigl, Victoria06 - Präsentation