The occurrence of bromate during the ozonation process can cause serious health problems as it was suspected human carcinogen. There have been extensive environmental technologies developed to eliminate an aqueous bromate precursor and bromate itself before and after the ozonation. However, these approaches are considered as difficult and ineffective ways of removal of bromate accompanied by several drawbacks. The catalytic reduction of bromate in the presence of NaBH4 is one of the promising techniques which not only removes the bromate, it also converts it to bromide. In addition, using solid H2-generating compounds is relatively safe and cost-effective. In recent times, metal-organic frameworks (MOFs) have attracted considerable attention having a variety of interesting structures and various applications in surface and groundwater. This research study investigated the reactivity of Ni(HBTC)(4,4’-bipy) with NaBH4 for the bromate reduction in an aqueous environment. The metal-organic framework, supporting with immobilized Ni porosity, was synthesized using 4,4’-bipyridine and 1,3,5-tricarboxylic acid in DMF at 100°C for 24 hours. MOFs in the presence of NaBH4 have shown accelerated reduction kinetics and complete conversion of bromate to bromide in 1 hour with a rate constant of 0.140 min-1. Moreover, the study found out that the increase in catalyst loading and NaBH4 loading resulted in further enhancement of bromate reduction. The above-mentioned results indicate that Ni(HBTC)(4,4’-bipy) with NaBH4 could be a promising environmental technology for the removal of bromate in water and wastewater systems.

Enhanced catalytic reduction of aqueous bromate by metal-organic framework Ni(HBTC)(4,4’-bipy) in the presence of NaBH4

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.