A Review on the Catalytic Hydrogenation of Bromate in Water Phase

Cerrillo, José Luis; Palomares, Emilio

doi:10.3390/catal11030365

Cited by 14 publications

(6 citation statements)

References 83 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, increasing the concentration of the coexisting anions leads to enhanced inhibition effects [50,51]. It was also reported that the catalyst deactivation appears more significant when harder waters are treated (high content of Ca 2+ and Mg 2+ ), resulting in an obstruction of the catalyst by the deposition of calcium salts, making it more difficult to access the catalytic active centers [10]. Regardless, the ball-milled sample clearly demonstrated complete bromate reduction during the whole treatment time from both the water well sample and the WTP sample, although it contained various competing ions.…”

Section: Application To Real Drinking Watermentioning

confidence: 99%

“…The support of the metal phase can influence the density, size, and morphology of the active centres of the metal and, as a result, the activity of the catalyst. Different supports such as AC, multi-walled carbon nanotubes (MWCNT), and titanium dioxide (TiO 2 ) were reported [8][9][10] as supports for the metal phase, having shown that the interaction of the support with the metallic phase is responsible for substantial differences in activity. In general, distinct catalytic performances were reported when using catalysts with similar metallic loadings but supported on different materials.…”

Section: Introductionmentioning

confidence: 99%

“…This allows to modify the length of the nanotubes and permits the opening of the closed ends, thus increasing the surface area and providing higher accessibility of the ionic species in water to the support surface [9,12]. The majority of works available regarding catalytic bromate reduction in water focus on the development and/or testing of catalysts and reaction conditions using powder materials in stirred tank reactors [9][10][11][13][14][15]. Only few works have been carried out in continuous reactors, mainly using macro-structured supports coated with the active phase deposited on activated carbon fibres or felts [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Engineering of Nanostructured Carbon Catalyst Supports for the Continuous Reduction of Bromate in Drinking Water

Costa

Barbosa

Restivo

et al. 2022

View full text Add to dashboard Cite

Recent works in the development of nanostructured catalysts for bromate reduction in drinking water under hydrogen have highlighted the importance of the properties of the metallic phase support in their overall performance. Since most works in catalyst development are carried out in powder form, there is an overlooked gap in the correlation between catalyst support properties and performance in typical continuous applications such as fixed bed reactors. In this work, it is shown that the mechanical modification of commercially available carbon nanotubes, one of the most promising supports, can significantly enhance the activity of the catalytic system when tested in a stirred tank reactor, but upon transition to a fixed bed reactor, the formation of preferential pathways for the liquid flow and high pressure drops were observed. This effect could be minimized by the addition of an inert filler to increase the bed porosity; however, the improvement in catalytic performance when compared with the as-received support material was not retained. The operation of the continuous catalytic system was then optimized using a 1 wt.% Pd catalyst supported on the as-received carbon nanotubes. Effluent and hydrogen flow rates as well as catalyst loadings were systematically optimized to find an efficient set of parameters for the operation of the system, regarding its catalytic performance, capacity to treat large effluent flows, and minimization of catalyst and hydrogen requirements. Experiments carried out in the presence of distilled water as a reaction medium demonstrate that bromate can be efficiently removed from the liquid phase, whereas when using a real water matrix, a tendency for the deactivation of the catalyst over time was more apparent throughout 200 flow passages over the catalytic bed, which was mostly attributed to the competitive adsorption of inorganic matter on the catalyst active centers, or the formation of mineral deposits blocking access to the catalyst.

show abstract

Section: Application To Real Drinking Watermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Engineering of Nanostructured Carbon Catalyst Supports for the Continuous Reduction of Bromate in Drinking Water

Costa

Barbosa

Restivo

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Furthermore, it was found that catalyst deactivation is more significant when the treated water is harder; that is, it contains higher levels of Ca 2+ and Mg 2+ . This leads to clogging of the catalyst due to salt deposition, making access to the catalyst difficult [51].…”

Section: Before Reactionmentioning

confidence: 99%

Magnetic Metallic Nanoparticles Coated with Carbon for the Catalytic Removal of Bromate from Water

Ramalho,

Soares,

Órfão

et al. 2024

Catalysts

View full text Add to dashboard Cite

Bromate, often detected in drinking water, is associated with a significant risk of cancer. Catalytic reduction has been recognized as an effective treatment technique to remove ions by reducing them over metal catalysts in the presence of a reducing agent, usually hydrogen. This work aims to synthesize metallic magnetic nanoparticles of iron oxide (FeO) and mixed iron oxides with manganese (MnFeO), cobalt (CoFeO), and copper (CuFeO) coated with carbon via chemical vapor deposition (C-MNP) to be applied as catalysts to the reduction of bromate in water. The use of magnetic nanoparticles coated with carbon enables catalyst recovery via magnetic separation and takes advantage of the catalytic properties of the carbon materials. The iron particles proved to be the most promising catalysts for the reduction of bromate into bromide, the highest removal being obtained with the CFeO@CVD750 sample, resulting in a 99% conversion after 120 min of reaction under the conditions tested. Due to its magnetic nature, the catalytic material was easily removed after the reaction and applied in four consecutive cycles without losing its catalytic properties. These results highlight the great potential of carbon-coated magnetic nanoparticles for reducing bromate in water.

show abstract

“…Catalytic BrO 3 − reduction technology has a series of distinct advantages. Due to its fast reaction kinetics towards contaminants, high efficiency, and extended durability, bromate reduction by nanoscale heterogeneous catalysts could be potentially applied to current groundwater and surface water treatment systems [ 6 ]. Based on the evaluation of significant environmental factors, these technologies exhibited reliable stability and cost-effectiveness [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

The Use of H2 in Catalytic Bromate Reduction by Nanoscale Heterogeneous Catalysts

2022

View full text Add to dashboard Cite

The formation of bromate (BrO3−)in groundwater treatment is still a severe environmental problem. Catalytic hydrogenation by nanoscale heterogeneous catalysts with gaseous H2 or solid-state H2 has emerged as a promising approach, which relies on reducing BrO3− to innocuous Br− via the process of direct electron transfer or reduction with atomic hydrogen. Several nanocatalysts have demonstrated high efficiency with a 100% effective BrO3− reduction with greater than 95% of Br− generation in the batch and continuous reactors. However, this technology has not been widely adopted in water treatment systems. Indeed, this research article summarizes the advantages and disadvantages of these technologies by highlighting the factors of nanomaterials reduction efficiency, long-term durability, and stability, as well as addressing the essential challenges limiting the implementation of the use of H2 for BrO3− reduction. In this work, we provide an economic evaluation of catalytic BrO3− removal, safe hydrogen supply, storage, and transportation.

show abstract

A Review on the Catalytic Hydrogenation of Bromate in Water Phase

Cited by 14 publications

References 83 publications

Engineering of Nanostructured Carbon Catalyst Supports for the Continuous Reduction of Bromate in Drinking Water

Engineering of Nanostructured Carbon Catalyst Supports for the Continuous Reduction of Bromate in Drinking Water

Magnetic Metallic Nanoparticles Coated with Carbon for the Catalytic Removal of Bromate from Water

The Use of H2 in Catalytic Bromate Reduction by Nanoscale Heterogeneous Catalysts

Contact Info

Product

Resources

About