Bimetallic activated carbon supported catalysts for the hydrogen reduction of bromate in water

Abstract

The association of bromate in drinking water with several public health risks, namely related to its carcinogenic potential and its toxic nature, has led to an interest in the development of sustainable alternatives for its removal from water. The hydrogen reduction of bromate over supported heterogeneous metallic catalysts has already been shown to be an interesting alternative for the reduction of bromate into less hazardous species, without formation of additional sludges. In this work, the coupling of a noble metal with a second metal supported on activated carbon has been studied for this reaction. Several metals were used for this goal, resulting in a wide array of combinations of noble and promoter metals. All the combinations showed remarkable activity for the complete conversion of bromate into bromide, without accumulation of by-products. The role played by the second metal was extensively studied, for which experiments were conducted using physical mixtures of the corresponding monometallic catalysts and also different metal amounts on the supported bimetallic catalysts. In most cases, the presence of a second metal hindered the activity of the noble metal, when compared with the respective monometallic catalyst. In the case of the Pd-Cu bimetallic catalyst, it is possible to improve the activity obtained with the Pd catalyst. The activity of the bimetallic catalyst was shown to be dependent on the composition.

Highly efficient reduction of bromate to bromide over mono and bimetallic ZSM5 catalysts

“…The results obtained in the present study are in line with those obtained in previous work using activated carbon as the support, 35,36 where the catalysts based on Pd and Pd-Cu demonstrated to be the most efficient in the bromate removal from water. The main difference observed is related to the absence of bromate adsorption when the zeolite is used as the support.…”

Photocatalytic Reduction Activity of 001 TiO2 Codoped with F and Fe under Visible Light for Bromate Removal

“…Appropriate technologies are imminently required for bromate removal to ensure the safety of water. The current alternatives to remove bromate are physical adsorption methods [4], biological treatment [5], catalytic reduction [6][7][8][9], electrochemical reduction [10], and photocatalysis [11,12].…”

Exploring beyond palladium: Catalytic reduction of aqueous oxyanion pollutants with alternative platinum group metals and new mechanistic implications

“…In recent screening studies by the Pereira and Neves team [34][35][36][37][38], several hydrogenation metals were evaluated for BrO 3 − and NO 3 − reduction, and Pd-based catalysts were still reported as having the highest activity. However, our group recently found that a Rh/C catalyst exhibited substantially higher activity than Pd/C for ClO 3 − reduction in acidic solution [39].…”