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Indexed by:期刊论文

Date of Publication:2017-03-16

Journal:TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY

Included Journals:SCIE、EI、Scopus

Volume:99

Issue:3

Page Number:363-375

ISSN No.:0277-2248

Key Words:Polyoxometalate; homogeneous photocatalysis; dyestuffs; photocatalytic reaction rate constants; quantitative structure-property relationship

Abstract:Polyoxometalate, K6TiW11O39Sn center dot 7H(2)O (TiW11Sn), was synthesized and characterized. TiW11Sn and K6ZrW11O39Sn center dot 12H(2)O (ZrW11Sn) were evaluated for their photocatalytic degradation of triarylmethane (brilliant green and acid blue 9), bisazo (C.I. reactive black 5), and monoazo dyestuffs (C.I. reactive red 24, C.I. reactive red 194, and C. I. reactive orange 5) with natural sunlight in homogeneous aqueous solutions. TiW11Sn and ZrW11Sn effectively and photocatalytically decolorized the dyestuffs. The TiW11Sn-and ZrW11Sn-mediated photocatalytic degradation of the dyestuffs involved a pseudo-first-order reaction and was modeled by Langmuir-Hinshelwood-type kinetics. The observed pseudo-first-order rate constants (K-/) of triarylmethane dyestuffs were generally bigger than that of the azo dyestuffs. Quantitative structure-property relationship models of the K-/ of the dyestuffs were developed using partial least-square regression. The cumulative variance of the dependent variable explained by the partial least-square components was >0.753 for each optimal model. This value indicated that the model had good predictive ability and robustness. The K-/ values of the dyestuffs were related to the energy of the lowest unoccupied molecular orbital, and the most positive net atomic charges on a sulfur atom of dyestuffs. The linear correlation coefficients between the predicted and experimental values were all >0.9950.