PhD position available in the Holmboe group!

Many countries such as Sweden rely on nuclear power to meet their energy needs.  As a result, various types of deep geologic repository concepts for the disposal of nuclear waste are being planned worldwide. The goal of this PhD project is to study radiation-induced chemistry at the molecular level in the context of nuclear waste disposal, using advanced theoretical and experimental techniques, such as molecular simulations, gamma-radiation and X-ray synchrotron-based methods. This 4-year PhD project is funded by the Swedish Radiation Authority (SSM), and builds upon prior research in the Holmboe group in collaboration with Prof. Mats Jonsson, Applied Phys. Chem, KTH, Sweden.

Link to add in English  


Figure 1. Schematic of flip-flopping of structural Fe(III) to Fe(II) and back, due to reactions with the primary radicals from water radiolysis. 

New paper shows dual effects of terrestrial organic matter on methylmercury bioaccumulation

A new study from Erik Björn’s research group demonstrates how the input of terrestrial organic matter influences methylmercury accumulation in coastal planktonic food webs through two opposing processes: (1) increased concentration of thiol functional groups associated with the terrestrial organic matter suppresses methylmercury incorporation at the base of the food web, through the formation of thermodynamically stable methylmercury-thiol complexes with low bioavailability; (2) brownification of the water phase enhances methylmercury biomagnification, through enhanced heterotrophic bacteria production causing a longer food web. Understanding the net outcome of these two processes is essential for predicting methylmercury concentrations in coastal food webs under changing inputs of terrestrial organic matter.

Documentary on mercury and climate research

The new documentary Fjords Frontiers: Digging into the Future of Climate Change, presents recent mercury and climate research by the teams of Eric Capo and Erik Björn at Umeå University. The documentary shows field research conducted at the Norwegian fjord Rossfjordsvatnet. The water mass in this fjord is redox-stratified with declining oxygen, and increasing hydrogen sulfide, concentrations at increasing depth. The research aims to understand how the expansion of oxygen deficiency in coastal seas may impact mercury biogeochemistry and microbial metabolisms.

The research is funded by the Swedish Research Council, The Swedish research council FORMAS and the Kempe Foundations.

August News on Boily “Ice in Rust” and “MgO Carbonation” Research Programs

Papers in press:

Chen T., Bui Thi. T.M., Luo T., Cheng W., Hanna, K. Boily J.-F. 2024. Redox-driven formation of Mn(III) in ice. Environ. Sci. Technol. paper here

Chen T., Boily J.-F., Hanna K. 2024. Transient adsorption of zwitterionic fluoroquinolones on Goethite during freeze-thaw cycles. ACS ES&T Water paper here

Luo T., Chen T., Cheng W., Lasabatère L., Boily, J.-F., Hanna K. 2024 Impact of water saturation on the fate and mobility of antibiotics in reactive porous geomedia. Environ. Sci. Technol.

Upcoming Oral Presentation at the 2024 Goldschmidt Conference in Chicago:

Sebaaly A., van Rijn F., Boily J.-F. Oxalate Driven Goethite Dissolution in Cold, Dark, Acidic Environments. Goldschmidt Conference. August 19, 2024.

https://conf.goldschmidt.info/goldschmidt/2024/meetingapp.cgi/Paper/22879

New Group Members

Romana Szakal (PhD student) November 2024
Maria Arizaleta (Postdoc) February 2025
Tao Chen (Postdoc) December 2024

News on Mg-carbonate projects in Boily group

1. Romana Szakal joins the group as a PhD student on November 2024. Funded by FORMAS project ” Direct mineralization of Atmospheric CO2 by Enhanced Weathering

2. We are hiring a PhD student in molecular modeling co-funded by FORMAS and SEED-HORIZON. This is a joint venture between Umeå University and IMT Atlantique with Andrey Kalinichev and Sébastien Le Crom.

3. Maria Arizaleta joins the group as a WISE-Kempe postdoc in early 2025