In addition, present paper describes an basic methylene blue dye adsorption method for the determination of specific surface area of bismuth, lead and manganese ferrocyanides.Īll chemicals used were of analytical-reagent grade. In view of this attempt has been made to determine the specific surface area of these metal ferrocyanides. Dye adsorption, has been used as substitute for BET measurement for determining the total surface of such compounds7,8.Ī search of literature indicated that some reports are available on determination of specific surface area of various solids by dyes9-12 and substituted phenols13,14 adsorption, but no report available on determination of SSA of bismuth, lead and manganese ferrocyanides by methylene blue dye adsorption. Due to their various applications, it become vital importance to have an determination of specific surface area of such compounds. These metal ferrocyanides have long been known to act as adsorbents1-3 and ion-exchangers4-6. are very important class of inorganic compounds. xH 2O where M could be Zn 2+, Cu 2+, Bi 2+, Pb 2+, Mn 2+ etc.
Insoluble double metal ferrocyanides of general formula M 2 Solute adsorption however offers several advantages over vapour phase adsorption for the determination of specific surface area of solids. The measurement of SSA of finally divided solids is becoming of increasing importance in many branches of technology and in the laboratory. Key words : methylene blue dye adsorption metal ferrocyanides Langmuir constants specific surface area. The SSA was found to be 86.67, 115.69 and 144.45 m 2 g -1 for bismuth, lead and manganese ferrocyanides, respectively. The specific surface area (SSA) has been calculated.
Methylene blue appears to be adsorbed flatwise from water with an effective surface area of 130Ǻ 2. Methylene blue dye adsorption on these metal ferrocyanides follows Langmuir adsorption isotherm. The mode of adsorption is indicated by the type of isotherms.
The percentage uptake of dye was found to be maximum and minimum for manganese and lead ferrocyanides, respectively. 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. AmericaĪ method of measuring the external specific surface area of bismuth, lead and manganese ferrocyanides is described. Use of basic Methylene Blue Dye for specific surface area measurement of metal hexacyanoferrate(II) complexesīrij Bhushan Tewari 1* and Clint Ostwald Thornton 1ġ Department of Chemistry, Faculty of Natural Sciences, University of Guyana, P.O.
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