Photodegradation of 4-nitrophenol (4-Np) in the presence of zinc tetrasulfophthalocyanine (ZnPcS4), zinc octacarboxyphthalocyanine (ZnPc(COOH)8) and a sulfonated ZnPc containing a mixture of differently sulfonated derivatives (ZnPcSmix), as photocatalysts is reported. ZnPcSmixis the most effective catalyst in terms of a high quantum yield for 4-Np degradation and the stability of the catalyst. However ZnPc(COOH)8degrades readily during the catalysis, but it has a higher quantum yield (Φ4-Np) for 4-Np degradation than the rest of the complexes. The Φ4-Npvalues were closely related to the singlet oxygen quantum yields ΦΔand hence aggregation. The rate constants for the reaction with 4-Np were kr= 0.67 × 106mol-1dm3s-1for ZnPcSmixand 2.8 × 108mol-1dm3s-1for ZnPc(COOH)8. © 2006 Elsevier B.V. All rights reserved.
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