Regulation of conjugated organic molecules on the photocatalytic performance of phosphomolydate for Cr(Ⅵ)reduction
The conjugated organic molecules modified hourglass-shaped Co {P4Mo6 }2-phosphomolybdate hybrid with the formula of(H2L1)2(H2L2)[Co(H2O)4]{ Co[P4Mo6O31H7]2}·4H2O(L1=2,2'-dimethyl-6,6'-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{P4Mo6}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 photocatalyt-ic performance in the reduction of Cr(Ⅵ).Within 120 min,the reduction conversion of Cr(Ⅵ) can reach 86％.Moreover,this hybrid still shows excellent catalytic performance in actual aqueous samples,revea-ling 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 photocat-alysts for Cr(Ⅵ)reduction.
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