Molecular structure design of conjugated microporous poly(dibenzo[b,d] thiophene 5,5-dioxide) for optimized photocatalytic NO removal

Conjugated microporous polymers with high BET surface areas and a tunable bandgap are promising candidates for photocatalytic NO removal in the solid-gas phase reaction system. Herein, we report that three conjugated microporous poly(dibenzo[b,d]thiophene 5,5-dioxide) (B-DT-1,3,5; B-DT-1,2,4; B-DT-1,2,4,5) consisting of alternating electron-rich and electron-deficient units with ethynyl linker have been synthesized, and optical bandgaps varied from 2.29 eV to 2.79 eV by adjusting the position and number of C equivalent to C connected to the 3D center benzene. Combined with intrinsic merits including facile tunable band gap and high BET surface areas, the synthesized CMP(B-DT) proved to be good photocatalysts for photo catalytic NO removal. The NO removal efficiency of B-DT-1,3,5 reached up to 56% with good stability. Active species scavenger experiments and other characterizations indicated that the superior photocatalytic NO removal ability of B-DT-1,3,5 may arise from the synergistic effect of stronger hole oxidation ability, greater amounts of center dot O-2(-) and O-1(2), and higher BET surface area. Thus, our proof-of-concept design of conjugated microporous polymers was used for a highly efficient photocatalytic NO removal in the solid-gas phase. (C) 2017 Elsevier Inc. All rights reserved.