Cobalt phthalocyanine-TiO₂ nanocomposites for photocatalytic remediation of textile dyes under visible light irradiation

Abstract

CoPc(COOH)[Formula: see text]-TiO[Formula: see text] nanocomposites to be used as efficient visible light photocatalysts were obtained by modifying TiO2 nanoparticles with cobalt(II) tetracarboxyphthalocyanine (CoPc(COOH)[Formula: see text]). The photocatalyst was then characterized by ultra-violet diffuse reflectance spectroscopy (UV-DRS), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The UV-DRS spectra showed that the absorbance spectrum of the modified catalyst was shifted to the visible region. Different textile dye solutions of Reactive Red 180, Acid Red 88 and Direct Orange 46 were efficiently degraded under visible light. Color removal rates were established to be 30%, 53% and 47% after 180 min for RR180, AR88 and DO46 dyes, respectively. The optimum catalyst concentration was determined to be 1 g/L of CoPc(COOH)[Formula: see text]-TiO[Formula: see text]. Development of the CoPc(COOH)[Formula: see text]-TiO[Formula: see text] nanocomposite photocatalyst enabled the utilization of visible light irradiation for efficient photodegradation of organic textile dye solutions.

Diversity of Synthetic Dyes from Textile Industries, Discharge Impacts and Treatment Methods

“…to produce green and blue shades (Figure 1). They have multiple inherent properties such as good colorfastness to light, resistance to oxidation, solubility in water and chemical stability [36,37].…”

Photocatalytic water oxidation by iron and copper phthalocyanine complexes immobilized on Fe3O4@SiO2@TiO2 under visible light irradiation

“…36 For the nanocomposites containing iron and copper phthalocyanine complexes, there exists a broad absorption peak in the 500-780 nm and 600-750 nm ranges, respectively; this peak is not observed for the Fe 3 O 4 @SiO 2 @TiO 2 nanostructure. 46,47 This shows that the complexes have been efficaciously loaded on the Fe 3 O 4 @SiO@TiO surface without changing the phthalocyanine frame indicating incorporation between phthalocyanine molecules and the TiO 2 layer of the substrate. 35 Based on the UV-DRS data and using the Tauc equation, 11 the bandgap energy of the Fe 3 O 4 @SiO@TiO nanostructure as well as the Fe 3 O 4 @-SiO@TiO-FePc and Fe 3 O 4 @SiO@TiO-CuPcN nanocomposites were found as 2.8, 1.4, and 1.8 eV, respectively (curves a-c in Figure 8B).…”

Mechanochemical route for tetra amino zinc phthalocyanine embedded PANI sensitized Fe2O3 heteroarchitecture for photodegradation of dyes under the influence of low power LED light source

“…Materials with an extended π-conjugated electron system poses excellent stability, improved conductivity, exceptional electrochemical performance, biomedical applications, photcatalytic activity [28][29][30][31][32][33]. In this context the MPc's, substituted MPc's and PANI sensitized semiconductor metal oxides have gained immense attention in recent years in many technological applications including photocatalyst for environmental remediation for their outstanding stability and fascinating optical property as they can absorb in the longer wavelength section of the visible light solar spectrum [34][35][36][37][38][39][40][41].…”