Enhanced catalytic reduction of aqueous bromate using Ni-based Metal-
organic framework in the presence of NaBH 4
Nurbek Nurlan, Mannix Balanay, Woojin Lee *
Department of Chemistry, School of Science and Humanities,
Nazarbayev University, Nur-Sultan, Kazakhstan
Email: *[email protected]
Abstract
The presence of bromate (BrO 3- ) in drinking water as the result of ozonation process was expected to cause
serious problems due to its carcinogenicity. The catalytic hydrogenation in the presence of NaBH 4 is one
of the promising environmental technologies which not only removes the aqueous bromate from drinking
and ground water, but also converts it to bromide. Recently, Metal-organic frameworks (MOFs) have been
attracted significant attention in the removal of contaminants from wastewater because of their excellent
chemical and physical properties. This study investigated the reactivity of MOF-Ni for reduction of bromate
in the presence of NaBH 4 . The catalyst was synthesized using Ni(NO 3 ) 2 x6H 2 O, 1,3,5-benzenetricarboxylic
acid and 4,4’-bipyridine in DMF and water with the ratio of 4:4:3, respectively. Moreover, the results
showed the full reduction of aqueous bromate to bromide in 2 hours with rate constant equal to 0.0478 min -
1
. The morphological features and structure of the catalyst were analyzed by SEM, XRD and FTIR
instruments. The catalyst was optimized based on the synthesis method, effects of catalyst and NaBH 4
loadings. Hence, Ni-based MOFs can be one of the promising ways of treating aqueous bromate in drinking
water.
References:
1. L. Andrew, S. Chen, Green Chem, 19 (2015) 853
2. K. Lin, S. Chen, ACS Sustain. Chem. Eng, 3 (2015) 3096