Novel Fe(II) phthalocyanine complexes for TiO2 sensitization

Abstract

A group of novel azo-bridged phenolic iron(II) phtalocyanine (Fe(II)Pcs) derivatives which have peripheral or non-peripheral substitution on macrocyclic ring were produced and characterized employing various spectroscopic methods. Peripheral or nonperipheral substituted Fe(II)Pc molecules (defined as Fe(II)Pc-1, Fe(II)Pc-2, Fe(II)Pc-3, Fe(II)Pc-4) were used for sensitization of TiO2 nanopowder to prepare photoactive composite catalysts (Fe(II)Pc/TiO2, 1% of the mass of TiO2) using wet deposition method. The as-obtained composite materials were characterized by SEM, EDX, UV-Vis DRS and XRD. The results revealed that the Fe(II)Pc derivatives were successfully immobilized on TiO2 and the anatase crystalline phase have absorption in the visible light region. Fe(II)Pc sensitized catalysts were tested for the photocatalytic removal of 4-chlorophenol (4-CP) in the presence of H2O2. Photocatalytic experiments showed that the H2O2 assisted Fe(II)Pc/TiO2 composites achieved high degradation of 4-chlorophenol except for Fe(II)Pc-4/TiO2. The photocatalytic efficiencies of the catalysts follow the order: Fe(II)Pc-3/TiO2 (93.21%) > Fe(II)Pc-1/TiO2 (87.61%) > Fe(II)Pc-2/TiO2 (83.86%) > TiO2 (67.74%) > Fe(II)Pc-4/TiO2 (64.71%).

Keywords

• Photocatalytic degradation
• 4-chlorophenol
• iron phthalocyanine
• phthalocyanine/TiO2 composite
• H2O2

TiO2 duyarlaştırılması için yeni Fe(II) ftalosiyanin kompleksleri

Öz

Yeni bir grup makrosiklik halkaya periferal veya periferal olmayan substitusyon içeren azo-köprülü fenolik demir (II) ftalosiyanin türevleri sentezlendi ve çeşitli spektroskopik yöntemler kullanılarak karakterizasyon çalışmaları yapıldı. Islak biriktirme yöntemi kullanılarak fotoaktif komposit katalizörler (Fe(II)Pc/TiO2, TiO2’in kütlece % 1) hazırlamak için TiO2 nanotozunun duyarlaştırılmasında periferal veya periferal olmayan substitue Fe(II)Pc molekülleri (Fe(II)Pc-1, Fe(II)Pc-2, Fe(II)Pc-3, Fe(II)Pc-4 olarak tanımlandı) kullanıldı. Elde edilen kompozit materyallerin SEM, EDX, UV-Vis DRS ve XRD teknikleri ile karakterizyon çalışmaları yapıldı. Sonuçlara göre Fe(II)Pc türevleri TiO2 yüzeyine başarılı bir şekilde yüklendiği ve anataz kristal faz görünür bölge ışınlarında absorpsiyon yaptığı görüldü. Fe(II)Pc ile duyarlaştırılmış katalizörler H2O2’nin varlığında 4-klorofenolün fotokatalitik uzaklaştırılması test edildi. Fotokatalitik çalışmalara göre H2O2 varlığında Fe(II)Pc-4/TiO2 kompozit materyalinin dışında diğer Fe(II)Pc/TiO2 kompositlerle, yüksek bir verim elde edidiği görülmüştür. Katalizörlerin fotokatalitik verimleri sıralaması Fe(II)Pc-3/TiO2 (% 93,21) > Fe(II)Pc-1/TiO2 (% 87,61) > Fe(II)Pc-2/TiO2 (% 83,86) > TiO2 (% 67,74) > Fe(II)Pc-4/TiO2 (% 64,71) şeklindedir.

Anahtar Kelimeler

• Fotokatalitik uzaklaştırma
• 4-klorofenol
• demir ftalosiyanin
• ftalosiyanin/TiO2 kompozit
• H2O2

Kaynakça

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