BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//a hub for materials research - ECPv6.15.18//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:a hub for materials research
X-ORIGINAL-URL:https://remade-project.eu
X-WR-CALDESC:Events for a hub for materials research
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Paris
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20250330T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20251026T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20260329T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20261025T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20270328T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20271031T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260313T100000
DTEND;TZID=Europe/Paris:20260313T110000
DTSTAMP:20260413T124927
CREATED:20260302T184856Z
LAST-MODIFIED:20260313T175130Z
UID:10000072-1773396000-1773399600@remade-project.eu
SUMMARY:Operando adsorption of heavy metals and their recycling into electrodes for energy storage
DESCRIPTION:Zoom webinar | Replay on Youtube\nMarcelo AMARO DE ANDRADE\,  \nInstitut des Matériaux Jean Rouxel de Nantes\, France \nTreating wastewater contaminated with heavy metals often relies on passive adsorption using high-surface area materials\, but once these adsorbents are saturated\, they become hazardous waste themselves. In this work\, Hg2+ cations uptake by reduced graphene oxide (rGO) was tracked under continuous-flow conditions\, using operando techniques to get a realistic picture of the adsorption process. A microfluidic platform was combined with Hg L3-edge synchrotron X-ray absorption spectroscopy (XAS) to monitor\, in real time\, how mercury coordinates and loads onto rGO during adsorption. At the same time\, an electrochemical quartz-crystal microbalance (EQCM) was used to independently follow changes in mass and viscoelastic properties of the rGO layer under model wastewater flow. This approach allowed to distinguish between strongly bound (chemisorbed) and more weakly coordinated (physisorbed) mercury species\, and to observe how these forms changed dynamically as adsorption progressed. 1 \nOn top of that\, the metals captured in these materials can also be used as redox-active components for further applications. Our group previously showed how rGO foams used to capture Hg2+ cations from model wastewater (rGO/Hgads) can be directly recycled into self-standing electrodes without extra chemical or thermal steps. In H2SO4\, these electrodes combine double-layer capacitance with redox-based faradaic reactions\, resulting in about 33% higher gravimetric capacity compared to pristine rGO (Figure 1 – left). 2 \nTo understand the charge-storage mechanism\, operando synchrotron Hg L3-edge XAS was used\, in addition to operando EQCM. Time-resolved XANES revealed two main mercury states: oxidized Hg(II) and a reduced state most consistent with Hg(I). Their concentration profiles show reversible cycling between Hg(II) and Hg(I)\, which corresponds to the electrochemical features observed in cyclic voltammetry. Hg(II) is consumed at the reduction peak around 0.60 V\, and regenerated at the oxidation peak near 0.64 V\, starting as early as 0.45 V (Figure 1 – right). This suggests that redox changes are not limited by simple thermodynamics\, and the capacity gain comes indeed from the adsorbed cations. L₃-edge jump analysis shows that the total mercury content changes with potential\, showing considerable mercury movement in and around the electrode during cycling\, which was correlated to EQCM-D measures. Overall\, this ReMade project allowed to understand both the heavy-metal capture mechanism\, and their later contribution to the electrochemistry by redox changes\, helping to advance new ways of combining environmental remediation with energy storage materials. \nReferences: \n\nAndrade\, M. A.\, Bugaev\, A. L.\, Skorynina\, A. & Douard\, C. Tracking Hg2+ adsorption by reduced graphene oxide in continuous flow by in situ techniques. J. Environ. Chem. Eng. 13\, 118680 (2025).\n\n2. Andrade\, M.\, Crosnier\, O.\, Johansson\, P. & Brousse\, T. Energy from Garbage: Recycling Heavy Metal‐Containing Wastewater Adsorbents for Energy Storage. Adv. Energy Sustain. Res. 6\, (2024).
URL:https://remade-project.eu/index.php/event/operando-adsorption-of-heavy-metals-and-their-recycling-into-electrodes-for-energy-storage/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://remade-project.eu/wp-content/uploads/2026/03/260313_ReMade@ARI-seminar_AMARO-DE-ANDRADE.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260327T100000
DTEND;TZID=Europe/Paris:20260327T110000
DTSTAMP:20260413T124927
CREATED:20260313T081247Z
LAST-MODIFIED:20260330T115331Z
UID:10000073-1774605600-1774609200@remade-project.eu
SUMMARY:Mechanisms of Pd nanoparticle formation and strong metal-support interaction in Pd/TiO2 revealed by operando XAS
DESCRIPTION:Zoom webinar | Replay on Youtube\nElizaveta KOZYR\,  \nE. Kozyr1\, P. Paciok2\, R. Pellegrini3\, M. Chiesa1\, Elena Groppo1\, L. Mino1\, A. Bugaev4 \n1University of Turin\, Italy; 2Forschungszentrum Jülich GmbH\, Germany; 3ALBAChimet S.p.A\, Italy;\n4Paul Scherrer Institute\, Switzerland; elizaveta.kozyr@unito.it \nUnderstanding the formation of active phases and metal-support interactions is essential for the rational design of efficient photocatalysts. In this work\, Pd/TiO2 catalysts prepared by photodeposition and deposition-precipitation were investigated using a combination of operando synchrotron-based X-ray absorption spectroscopy (XAS) and complementary microscopic and spectroscopic techniques. A custom operando photocatalytic cell enabled in situ monitoring of the Pd photodeposition process\, revealing the formation of single-atom Pd(0) sites as an initial step followed by the growth of ~1 nm Pd nanoparticles with narrow size distribution. Photodeposited catalysts exhibit strong metal-support interaction (SMSI)\, associated with the presence of Ti³⁺ sites at the Pd/TiO2 interface and direct Pd-Ti interactions observed by XAS\, EPR\, and EELS. These features lead to enhanced stabilization of metallic Pd even under oxidizing conditions\, in contrast to catalysts prepared by deposition-precipitation. The results highlight how synthesis pathways govern nanoparticle formation mechanisms and metal-support interactions in Pd/TiO2 photocatalysts. \nAcknowledgements \nWe thank ReMade@ARIE funded by the European Union as part of the Horizon Europe call HORIZON-INFRA-2021-SERV-01 under grant agreement number 101058414 and co-funded by the Swiss State Secretariat for Education\, Research and Innovation (SERI) under contract number 22.00187 for the access to the HR-STEM measurements (ERC\, Julich\, Germany) and XAS measurements at SuperXAS beamline of Swiss Light Source.
URL:https://remade-project.eu/index.php/event/mechanisms-of-pd-nanoparticle-formation-and-strong-metal-support-interaction-in-pd-tio2-revealed-by-operando-xas/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://remade-project.eu/wp-content/uploads/2026/03/260327_ReMade@ARI-seminar_KOZYR.jpg
END:VEVENT
END:VCALENDAR