Abstract

BHUSHAN TEWARI, Brij  and  OSTWALD THORNTON, Clint. Use of basic Methylene Blue Dye for specific surface area measurement of metal hexacyanoferrate(II) complexes. Rev. Soc. Quím. Perú [online]. 2010, vol.76, n.4, pp.330-335. ISSN 1810-634X.

A method of measuring the external specific surface area of bismuth, lead and manganese ferrocyanides is described. Basic methylene blue dye in a range of concentration in dilute aqueous solution is applied at room temperature and adsorption isotherms are determined by spectrophotometric analysis of solutions. The percentage uptake of dye was found to be maximum and minimum for manganese and lead ferrocyanides, respectively. The mode of adsorption is indicated by the type of isotherms. Methylene blue dye adsorption on these metal ferrocyanides follows Langmuir adsorption isotherm. Methylene blue appears to be adsorbed flatwise from water with an effective surface area of 130Ǻ². The specific surface area (SSA) has been calculated. The SSA was found to be 86.67, 115.69 and 144.45 m² g^-1 for bismuth, lead and manganese ferrocyanides, respectively.

Keywords : methylene blue dye; adsorption; metal ferrocyanides; Langmuir constants; specific surface area.

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