Tom Hennebel

Tom Hennebel
Umicore

About

85
Publications
12,737
Reads
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3,352
Citations
Additional affiliations
November 2012 - present
University of California, Berkeley
Position
  • PostDoc Position
January 2007 - October 2012
Ghent University
Position
  • PhD+postdoctoral researcher

Publications

Publications (85)
Article
Full-text available
Metallurgical wastewaters contain high concentrations of sulfate, up to 15 g L⁻¹. Sulfate-reducing bioreactors are employed to treat these wastewaters, reducing sulfates to sulfides which subsequently co-precipitate metals. Sulfate loading and reduction rates are typically restricted by the total H2S concentration. Sulfide stripping, sulfide precip...
Article
The use of electronic waste or low grade materials as feedstock for the electrolytic production of copper is challenging because impurity metals such as Sb(III) are introduced in the electrolyte. In this work, the mechanisms that lead to antimony contamination in electrolytic copper are studied. Linear sweep voltammetry experiments indicate that th...
Chapter
Full-text available
Throughout history, the first and foremost role of urban water management has been the protection of human health and the local aquatic environment. To this end, the practice of (waste-)water treatment has maintained a central focus on the removal of pollutants through dissipative pathways. Approaches like – in the case of wastewater treatment – th...
Article
Copper producers face increased demand associated with increasing complexity in feedstock composition, including high amounts of impurity metals. In this work, linear sweep voltammetry was used to study the electrodeposition behavior of copper and arsenic, define strategies for the production of grade A copper, and the removal of arsenic from compl...
Article
Full-text available
Over the past decades, biological treatment of metallurgical wastewaters has become commonplace. Passive systems require intensive land use due to their slow treatment rates, do not recover embedded resources and are poorly controllable. Active systems however require the addition of chemicals, increasing operational costs and possibly negatively a...
Data
Video showing the precipitation of As2S3 from As(III) and As(V) containing liquid (pH=2). The video show the difference in kinetics: As(III) precipitates much faster than As(V). Also, the difference in morphology is also clear: Precipitates from the As(III) liquid coagulate much easier, while precipitates from the As(V) liquid disperse and do not c...
Preprint
Full-text available
Cu-NH3 bearing effluents arise from electroplating and metal extraction industries, requiring innovative and sustainable Cu recovery technologies to reduce their adverse environmental impact. CO32- and Zn are often co-occurring, and thus, selective Cu recovery from these complex liquid streams is required for economic viability. This study assessed...
Article
Cu–NH3 bearing effluents arise from electroplating and metal extraction industries, requiring innovative and sustainable Cu recovery technologies to reduce their adverse environmental impact. CO3²⁻ and Zn are often co-occurring, and thus, selective Cu recovery from these complex liquid streams is required for economic viability. This study assessed...
Preprint
Full-text available
Nickel (Ni) is an economically important metal characterized by its mechanical strength and anticorrosion properties. With the increasing industrial demand for Ni and the depleting accessible Ni primary ores, sustainable technologies are required for the recovery of this metal from alternative resources. In this study, adsorption using chitosan was...
Article
Nickel (Ni) is an economically important metal characterized by its mechanical strength and anticorrosion properties. With the increasing industrial demand for Ni and the depleting accessible Ni primary ores, sustainable technologies are required for the recovery of this metal from alternative resources. In this study, adsorption using chitosan was...
Article
Full-text available
This study presents a sustainable approach for metal extraction from a range of secondary resources. Organic acids analogue to those commonly produced by heterotrophic microbes are applied via a two-step heterotrophic bioleaching approach. New insights into leaching mechanisms are developed and the potential use of the leaching residues as cementit...
Article
Full-text available
Siderophores are a class of biogenic macromolecules that have high affinities for metals in the environment, thus could be exploited for alternate sustainable metal recovery technologies. Here, we assess the role of siderophores in the extraction and complexation of metals from an iron oxide-rich metallurgical processing residue and a low-grade pri...
Article
Full-text available
The effects of surface pretreatment of 304 stainless steel (SS) substrates on copper film formation, adhesion, and purity obtained by galvanostatic electrodeposition at a current density of – 30 mA cm⁻² are presented. The polished substrate produced more copper nuclei, resulting in an increase of the adhesion as compared to chemically oxidized SS s...
Article
Full-text available
With the global demand for economically important metals increasing, compounded by the depletion of readily accessible ores, secondary resources and low-grade ores are being targeted to meet growing demands. Novel technologies developed within biobased industries, such as microbial biosurfactants, could be implemented to improve the sustainability...
Preprint
Full-text available
Siderophores are a class of biogenic macromolecules that have high affinities for metals in the environment, thus could be exploited for alternate sustainable metal recovery technologies. Here, we assess the role of siderophores in the extraction and complexation of metals from an iron oxide-rich metallurgical processing residue and a low-grade pri...
Article
Full-text available
Precipitation of arsenic as As 2 S 3 produces little waste sludge, has the potential for low chemical consumption and for selective metal(loid) removal. In this study, arsenic removal from acidic (pH 2), metallurgical wastewater was tested in industrially relevant conditions. Sulfides added at a S:As molar ratio of 2.5 and 5 resulted in removal of...
Presentation
Presented work at ICHMet 2020 on the recovery of Pb from mine tailings through bioleaching with citrate and elctrochemical precipitation as PbSO4
Article
Full-text available
With the number of easily accessible ores depleting, alternate primary and secondary sources are required to meet the increasing demand of economically important metals. Whilst highly abundant, these materials are of lower grade with respect to traditional ores, thus highly selective and sustainable metal extraction technologies are needed to reduc...
Article
Many metal refining processes generate low-grade mineral residues that are typically stored on landfills and responsible for inefficient land-use. While being of environmental concern, residual metals contained in these wastes can become an interesting secondary resource. A novel bio-hydrometallurgical route for recovery of Zn from such waste resid...
Conference Paper
Full-text available
From the early days of the Industrial Revolution, primary mining and metal processing industries in Europe have, and continue to landfill and/or stockpile significant quantities of metal containing tailings, which often represent an environmental and health risk. However, this 'tailings problem' may be seen as an opportunity and by valorising these...
Conference Paper
From the early days of the Industrial Revolution, primary mining and metal processing industries in Europe have, and continue to landfill and/or stockpile significant quantities of metal containing tailings, which often represent an environmental and health risk. However, this 'tailings problem' may be seen as an opportunity and by valorising these...
Article
Full-text available
Rare earth elements (REEs) have become increasingly important in modern day technologies. Unfortunately, their recycling is currently limited and the conventional technologies for their extraction and purification are exceedingly energy and chemical intensive. New sustainable technologies for REE extraction from both primary and secondary resources...
Article
Full-text available
The widespread use of platinum in high-tech and catalytic applications has led to the production of diverse Pt loaded wastewaters. Effective recovery strategies are needed for the treatment of low concentrated waste streams to prevent pollution and to stimulate recovery of this precious resource. The biological recovery of five common environmental...
Data
Transmission electron microscopy (TEM) images of thin sections of Shewanella oneidensis MR-1, Cupriavidus metallidurans CH34 and Geobacter metallireducens cells respectively, loaded with platinum particles. The precipitation of platinum was induced by the presence of formate as electron donor. (TIF)
Data
Platinum particle distributions of platinum nanoparticles (nm) formed by five different bacterial cultures (based on total particle surface area). The different Pt-complexes were precipitated in the presence of hydrogen gas. No Pt particles were observed during the recovery of cisplatin by Bacillus toyonensis and Pseudomonas stutzeri, while Geobact...
Data
Platinum particle distributions of platinum nanoparticles (nm) (based on total particle surface area), formed by the bacterial species Shewanella oneidensis MR-1, Cupriavidus metallidurans CH34 and Geobacter metallireducens. The Pt(II)Cl42- and Pt(IV)Cl62- complexes were precipitated in the presence of formate as electron donor. (TIF)
Data
Additional platinum recovery efficiencies (%) for Pt(IV)Cl62-, measured after 48 h, for Shewanella oneidensis MR-1, Geobacter metallireducens and Bacillus toyonensis species with different electron donors (formate, acetate or H2; pH 2) (n = 1). (TIF)
Data
(A) Extended X-ray Absorption Fine Structure (EXAFS) spectra and their (B) Fourier Transforms (FT) of biomass pellet samples after Pt(II)Cl42- recovery by three bacterial species: Geobacter metallireducens, Cupriavidus metallidurans CH34 and Shewanella oneidensis MR-1. (TIF)
Data
(A) Extended X-ray Absorption Fine Structure (EXAFS) spectra and their (B) Fourier Transforms (FT) of biomass pellet samples after Pt(IV)Cl62- recovery by two bacterial species: Geobacter metallireducens and Shewanella oneidensis MR-1. (TIF)
Data
Platinum recovery efficiencies (%) are given under different recovery conditions; the sorption of all Pt-complexes was studied at pH 7 while the reduction (pH 2; with formate or acetate) was only studied for Pt(II)Cl42- and Pt(IV)Cl62- using the Shewanella oneidensis MR-1, Cupriavidus metallidurans CH34 and Geobacter metallireducens species (n = 1)...
Article
The increased use and criticality of platinum asks for the development of effective low-cost strategies for metal recovery from process and waste streams. Although biotechnological processes can be applied for the valorization of diluted aqueous industrial streams, investigations considering real stream conditions (e.g., high salt levels, acidic pH...
Article
Metal recycling based on urban mining needs to be established to tackle the increasing supply risk of critical metals such as platinum. Presently, efficient strategies are missing for the recovery of platinum from diluted industrial process streams, often characterized by extremely low pHs and high salt concentrations. In this research, halophilic...
Article
The increased development of green low-carbon energy technologies that require platinum group metals (PGMs) and rare earth elements (REEs), together with the geopolitical challenges to sourcing these metals, has spawned major governmental and industrial efforts to rectify current supply insecurities. As a result of the increasing critical importanc...
Article
Full-text available
Recent scientific developments have shed more light on the importance of the host-microbe interaction, particularly in the gut. However, the mechanistic study of the host-microbe interplay is complicated by the intrinsic limitations in reaching the different areas of the gastrointestinal tract (GIT) in vivo. In this paper, we present the technical...
Article
Full-text available
Short-chain carboxylates such as acetate are easily produced through mixed culture fermentation of many biological waste streams, although routinely digested to biogas and combusted rather than harvested. We developed a pipeline to extract and upgrade short-chain carboxylates to esters via membrane electrolysis and biphasic esterification. Carboxyl...
Article
Full-text available
Fermentative production of bio-hydrogen (bio-H2) from organic residues has emerged as a promising alternative for providing the required electron source for hydrogen driven remediation strategies. Unlike the widely used production of H2 by bacteria in fresh water systems, few reports are available regarding the generation of biogenic H2 and optimis...
Article
Full-text available
Anaerobic digestion (AD) is a well-established technology for energy recovery from organic waste streams. Several studies noted that inserting a bioelectrochemical system (BES) inside an anaerobic digester can increase biogas output, however the mechanism behind this was not explored and primary controls were not executed. Here, we evaluated whethe...
Article
Full-text available
Biogenic catalysts have been studied over the last 10 years in freshwater and soil environments, but neither their formation nor their application has been explored in marine ecosystems. The objective of this study was to develop a biogenic nanopalladium-based remediation method for reducing chlorinated hydrocarbons from marine environments by empl...
Article
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...
Article
Full-text available
Sustainable production methods for catalytic palladium (Pd) nanoparticles are currently being investigated due to their increasing use, limited availability and price volatility. The bio-palladium (bio-Pd) method uses bacteria as a producer and carrier of Pd nanoparticles. In this method, Pd leaching results in economical loss and environmental ris...
Article
Full-text available
Extracellular electron transfer has, in one decade, emerged from an environmental phenomenon to an industrial process driver. On the one hand, electron transfer towards anodes leads to production of power or chemicals such as hydrogen, caustic soda and hydrogen peroxide. On the other hand, electron transfer from cathodes enables bioremediation and...
Data
Fig. S1. APA removal as a function of time during 7 days incubation of ABIL biomass (0.75 g VSS l‐1) in minimal medium supplemented with 1 mg APA l‐1. To examine sorption of APA to the biomass, heat‐inactivated biomass was incubated in a control experiment (0.75 g VSS l‐1). Results from a biomass‐free control in the minimal medium are also shown. T...
Article
Transparent exopolymer particles (TEP) have recently gained interest in relation to membrane fouling. These sticky, gel-like particles consist of acidic polysaccharides excreted by bacteria and algae. The concentrations, expressed as xanthan gum equivalents L⁻¹ (μg X(eq) L⁻¹), usually reach hundred up to thousands μg X(eq) L⁻¹ in natural waters. Ho...
Article
The use of two nanoparticulate palladium based catalysts in the Suzuki reaction is described. One monometallic (Pd) and one bimetallic (Pd/Au) catalyst were prepd. by the environmentally benign method of bioreductive pptn. by Shewanella oneidensis. Both catalysts successfully mediated the Suzuki coupling, however, the Au doped catalyst was shown to...
Article
Anaerobic digestion is an important technology in the framework of renewable energy production. The anaerobic digestion system is susceptible to perturbations due to the sensitivity of the methanogens towards environmental factors. Currently, technology is evolving from conventional waste treatment, i.e. the removal of pollutants, to very intensive...
Article
By using the metal reducing capacities of bacteria, Pd nanoparticles can be produced in a sustainable way ('bio-Pd'). These bio-Pd nanoparticles can be used as a catalyst in, for example, dehalogenation reactions. However, some halogenated compounds are not efficiently degraded using a bio-Pd catalyst. This study shows that the activity of bio-Pd c...
Article
Diclofenac is one of the most commonly detected pharmaceuticals in wastewater treatment plant (WWTP) effluents and the receiving water bodies. In this study, biogenic Pd nanoparticles ('bio-Pd') were successfully applied in a microbial electrolysis cell (MEC) for the catalytic reduction of diclofenac. Hydrogen gas was produced in the cathodic compa...
Article
Full-text available
The occurrence of a range of recalcitrant organic micropollutants in our aquatic environment has led to the development of various tertiary wastewater treatment methods. In this study, biogenic manganese oxides (Bio-MnOx), biogenic silver nanoparticles (Bio-Ag(0) ) and ionic silver were used for the oxidative removal of the frequently encountered d...
Article
Lindane (γ-hexachlorocyclohexane, γ-HCH) is a recalcitrant and toxic organochlorine insecticide. Due to its non-selective production process and widespread use, HCH isomers and their degradation products have been detected frequently in soils and groundwater. An innovative technology using microbial produced Pd(0) nanoparticles, i.e. bio-Pd, was de...
Article
Purpose of work Hydrodehalogenation of persistent pollutants, such as the groundwater contaminants trichloroethylene and diatrizoate, are catalyzed by biogenic Pd nanoparticles. As H2 gas supply for the dehalogenation reactions is still the limiting factor, this study examines in situ H2 production in the cathode of a microbial electrolysis cell. I...
Article
Biologically produced monometallic palladium nanoparticles (bio-Pd) have been shown to catalyze the dehalogenation of environmental contaminants, but fail to efficiently catalyze the degradation of other important recalcitrant halogenated compounds. This study represents the first report of biologically produced bimetallic Pd/Au nanoparticle cataly...
Article
To decrease the load of pharmaceuticals to the environment, decentralized wastewater treatment has been proposed for important point-sources such as hospitals. In this study, a microbial electrolysis cell (MEC) was used for the dehalogenation of the iodinated X-ray contrast medium diatrizoate. The presence of biogenic palladium nanoparticles (bio-P...
Article
Full-text available
A new biological inspired method to produce nanopalladium is the precipitation of Pd on a bacterium, i.e., bio-Pd. This bio-Pd can be applied as catalyst in dehalogenation reactions. However, large amounts of hydrogen are required as electron donor in these reactions resulting in considerable costs. This study demonstrates how bacteria, cultivated...
Article
While precious metals are available to a very limited extent, there is an increasing demand to use them as catalyst. This is also true for palladium (Pd) catalysts and their sustainable recycling and production are required. Since Pd catalysts exist nowadays mostly under the form of nanoparticles, these particles need to be produced in an environme...