Regulation of conjugated organic molecules on the photocatalytic performance of phosphomolydate for Cr(VI) reduction.

BI Haoxue; GAO Mingxia; MA Xinying; LIAO Hanyu; ZHANG Zixiang; DU Jing; MA Yuanyuan; HAN Zhan'gang

The conjugated organic molecules modified hourglass-shaped Co {P4Mo6 }2-phosphomolybdate hybrid with the formula of (H2L1)2 (H2L2) [Co(H2O)4] {Co [P4 MO6 O31 H72} 4H2O (L1=2,2-dimethyl6,6-biquinoline, L2-4,4-diaminobiphenyl) was synthesized via the hydrothermal method and applied in the photocatalytic reduction of hexavalent chromium Cr(VI). Experimental results indicate that this hybrid is composed of 1D chains formed by Co{P4 Mo6}2 phosphomolybdate anionics connected via single-bridged [Co(H2O)4]2+ cations, which further interact with conjugated organic molecules L1 and L2 via hydrogen bonds to form the 3D supramolecular structure. This hybrid exhibits an extensive absorption of visible light, coupled with an appropriate energy band structure, which contribute to its remarkable photocatalytic performance in the reduction of Cr(VD). Within 120 min, the reduction conversion of Cr(VD) can reach 86%. Moreover, this hybrid still shows excellent catalytic performance in actual aqueous samples, revealing its strong potential for practical applications. The mechanism of photocatalytic reduction reaction was further studied. This work provides a new method for designing efficient polyoxometalate-based photocatalysts for Cr(VI) reduction.

HEXAVALENT chromium; PHOTOCATALYSTS; LIGHT absorption; VISIBLE spectra; ENERGY bands

Journal of Molecular Science, 2024, Vol 40, Issue 5, p421

1000-9035

Academic Journal

10.13563/j.cnki.jmolsci.2024.05.105