Enhanced reduction of aqueous bromate by catalytic hydrogenation using the Ni-based Metal-organic framework Ni(4,4′-bipy)(1,3,5-BTC) with NaBH4

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

“…The hydrolysis of borohydrides can be accelerated using heterogeneous catalysts. For instance, the catalytic reduction efficiency of BrO 3 − by the Zeolite-Imidazole Framework (ZIF-67), Material Institute Lavoisier (MIL-88A), as well as 4,4′-bipyridine and 1,3,5-benzenetricarboxylic acid ligands (Ni(4,4′-bipy)(1,3,5-BTC)) in the presence of NaBH 4 showed an effective reduction in 60 min with >95% formation of Br − ( Table 1 ) [ 22 , 23 , 24 ]. Furthermore, hydrogen evolution during BrO 3 − reduction is able to be controlled by the concentration of borohydrides and different catalyst loadings.…”

“…Compared to the process of BrO 3 − removal by nanomaterial catalysts with gaseous H 2 , a more efficient BrO 3 − reduction integrated with solid borohydride hydrolysis is achievable using non-noble metals [ 29 ]. The durable and sustainable catalytic reactivity for several cycles of BrO 3 − reduction can be considered another advantage of using solid borohydrides, e.g., ZIF-67 and Ni(4,4′-bipy)(1,3,5-BTC) which continuously showed a complete removal in the 5th and 6th cycles ( Table 2 ) [ 22 , 23 ]. A disadvantage of using solid-state H 2 chemical compounds is the need for secondary treatment to treat NaBH 4 byproducts (boron species, i.e., NaBO 2 ) formed after their hydrolysis, which often impedes their industrial application [ 30 ].…”

Biomimetic Guided Bi2WO6/Bi2O3 Vertical Heterojunction with Controllable Microstructure for Efficient Photocatalysis

“…The use of composites comprising other semiconductor materials is an approach used to enhance the catalytic activity of Bi 2 O 3 [ 16 ]. The solid–solid heterojunction interface can be formed at the contact surface of the two coupling semiconductors [ 17 ], which enables the semiconductor space to form a potential difference in close contact with the crystal boundary using the band overlap effect, accelerates the efficiency of charge separation within the system, and enhances the catalytic activity by expanding the spectral response range of the catalyst [ 18 ]. Despite the coupling of numerous different materials to Bi 2 O 3 and the significant improvement in photocatalytic performance, some defects remain.…”

Synthesis, Structure, and Heterogeneous Catalysis of a Series of Structurally Diverse Coordination Polymers Based on 5-Nitroisophthalate

“…A combination of simple carboxylic acid such as 1,4-benzendicarboxylic acid − and 1,3,5-benzenetricarboxylic acid − with metal ions exhibits interesting properties. The structure of trimesic acid with 120° angular disposition between the three carboxylic acid groups along with the rigid aromatic backbone has gained attention for synthesizing various important compounds. − Substitution of one of the carboxylic acid groups with one nitro group in trimesic acid would change not only the symmetry of the moiety but also other features including hydrogen bonding acceptor site, electron-donating site, and reactivity toward metal. − By virtue of the differences offered by the ligand 5-nitroisophthalic acid (H 2 NIPA), along with the well-established scopes of CPs, H 2 NIPA in the assembly of CPs could exhibit interesting properties.…”