Removal of Toxic 2, 4-Dinitrophenol (2, 4-DNP) and 2, 4, 6-Trinitrophenol (2, 4, 6-TNP) through Adsorptive Interaction with Metal Ferrocyanides | Chapter 02 | Theory and Applications of Chemistry Vol. 1

Antimony,  cadmium  and  zirconium  hexacyanoferrates  (II)  were  synthesized  and  characterized  by elemental and spectral studies. Interaction of 2, 4-dinitrophenol (2, 4-DNP) and 2, 4, 6-trinitrophenol (2,  4, 6-TNP)  with  antimony,  cadmium  and  zirconium  hexacyanoferrates (II)  have  been  studied  at neutral pH (7.00 ± 0.01) and a temperature of 30 ± 1°C. The progress of adsorption was followed spectrophotometrically  by  measuring  the  absorbance of  substituted  phenols at  their corresponding λmax.  The  nature  of  adsorption  has  been  interpreted  from  the  shape  of  adsorption  isotherms.  The Langmuir type of adsorption is followed in the concentration range of 10ˉ³ –10ˉ⁴ M of 2, 4-DNP and 2, 4, 6-TNP solutions. The 2, 4, 6 -TNP was found to have greater affinity for the antimony, cadmium and zirconium hexacyanoferrates (II) than 2, 4 –DNP. High adsorption capacity has been observed for  cadmium  hexacyanoferrate  (II)  while  it  is  minimum  with  zirconium  hexacyanoferrate  (II),  which indicate highly porous characteristics of cadmium hexacyanoferrate (II) in comparison to other metal hexacyanoferrates  (II)  studied.  Removal  of  toxic  phenol  is  necessary  for  the  protection  of  our environment.  Phenols  react  with  soil  to  reduce  their  fertility  therefore  its  removal  from  soil  is  also important for our food security. The p-nitrophenol was found to have greater affinity for the antimony, cadmium and zirconium ferrocyanides than the p-aminophenol. The adsorption of 2, 4-DNP and 2, 4,6-TNP on copper, zinc, molybdenum and chromium ferrocyanides was studied at different pH and temperature. The thermodynamic parameters for adsorption od 2, 4-DNP and 2, 4, 6-TNP on metal ferrocyanides is reported.

Author(s) Details

Professor Brij Bhushan Tewari, B.Sc., M.SC., D.Phil., FRCS

Department of Chemistry, Faculty of Natural Sciences, University of Guyana, P. O. Box: 101110, Georgetown, Guyana.

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