Hexagonal mesoporous silica modified with copper phthalocyanine as a photocatalyst for pesticide 2,4-dichlorophenoxiacetic acid degradation

J Colloid Interface Sci. 2008 Jul 1;323(1):98-104. doi: 10.1016/j.jcis.2008.04.025. Epub 2008 Apr 16.

Abstract

A new mesoporous catalyst was prepared by the reaction between 3-aminopropyltrimethoxisylane and Cu(II)-hexadecafluorophthalocyanine, followed by co-condensation of tetraethylorthosilicate around a micelle formed by n-dodecylamine. The surfactant was removed from the pores by continuous extraction with ethanol, giving the Si-CuF16Pc catalyst. This catalyst was characterized by SEM, FTIR, TGA, 29Si NMR, N2 adsorption and X-ray diffraction. SEM images confirmed that the catalyst material is formed by nanoaggregates with a diameter of 100 nm. N2 adsorption isotherms showed that Si-CuF16Pc has a surface area of approximately 200 m2 g(-1) and a porous diameter of 7.7 nm, characterizing the mesoporosity of this product. This novel material shows an excellent photocatalytic activity, degrading almost 90% of 2,4-dichlorophenoxyacetic acid (2,4-D) up to 30 min, while only approximately 40% of photodegradation was obtained in its absence.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 2,4-Dichlorophenoxyacetic Acid / chemistry*
  • Adsorption
  • Amines / chemistry
  • Biochemistry / methods
  • Catalysis
  • Indoles / chemistry*
  • Light
  • Materials Testing
  • Microscopy, Electron, Scanning
  • Models, Chemical
  • Organometallic Compounds / chemistry*
  • Pesticides / chemistry*
  • Photochemistry / methods*
  • Silicon Dioxide / chemistry*
  • Surface-Active Agents
  • X-Ray Diffraction

Substances

  • Amines
  • Indoles
  • Organometallic Compounds
  • Pesticides
  • Surface-Active Agents
  • 2,4-Dichlorophenoxyacetic Acid
  • copper phthalocyanine
  • Silicon Dioxide
  • dodecylamine