Effect of solvents on the extraction of natural pigments and adsorption onto TiO2 for dye-sensitized solar cell applications

Mahmoud A M Al-Alwani, Abu Bakar Mohamad, Abdul Amir H. Kadhum, Norasikin Ahmad Ludin

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Nine solvents, namely, n-hexane, ethanol, acetonitrile, chloroform, ethyl-ether, ethyl-acetate, petroleum ether, n-butyl alcohol, and methanol were used to extract natural dyes from Cordyline fruticosa, Pandannus amaryllifolius and Hylocereus polyrhizus. To improve the adsorption of dyes onto the TiO2 particles, betalain and chlorophyll dyes were mixed with methanol or ethanol and water at various ratios. The adsorption of the dyes mixed with titanium dioxide (TiO2) was also observed. The highest adsorption of the C. fruticosa dye mixed with TiO2 was achieved at ratio 3:1 of methanol: water. The highest adsorption of P. amaryllifolius dye mixed with TiO2 was observed at 2:1 of ethanol: water. H. polyrhizus dye extracted by water and mixed with TiO2 demonstrated the highest adsorption among the solvents. All extracted dye was adsorbed onto the surface of TiO2 based on Fourier Transform Infrared Spectroscopy (FTIR) analysis. The inhibition of crystallinity of TiO2 was likewise investigated by X-ray analysis. The morphological properties and composition of dyes were analyzed via SEM and EDX.

Original languageEnglish
Pages (from-to)130-137
Number of pages8
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume138
DOIs
Publication statusPublished - 13 Feb 2015

Fingerprint

pigments
Pigments
Coloring Agents
Dyes
solar cells
dyes
Adsorption
adsorption
Methanol
Ethanol
ethyl alcohol
methyl alcohol
Water
water
Ethers
ethers
Betalains
Dye-sensitized solar cells
1-Butanol
X ray analysis

Keywords

  • Betanin
  • Betaxanthins
  • Chlorophyll
  • Dye-sensitized solar cell
  • Natural pigments
  • Solvents

ASJC Scopus subject areas

  • Instrumentation
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Spectroscopy

Cite this

Effect of solvents on the extraction of natural pigments and adsorption onto TiO2 for dye-sensitized solar cell applications. / Al-Alwani, Mahmoud A M; Mohamad, Abu Bakar; Kadhum, Abdul Amir H.; Ahmad Ludin, Norasikin.

In: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, Vol. 138, 13.02.2015, p. 130-137.

Research output: Contribution to journalArticle

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