Synthesis and characterization of reactive dye-cassava mesocarp cation exchange resins

The synthesis of triazine based reactive dyes was carried out. The resultant dyes were characterized by thin layers chromatography, molecular weight, infrared and ultra- violet spectroscopy, and used in dyeing cassava mesocarp to produce dye modified cellulosic substrates. The dyed substrates weretested for dye fixation, fastness (acid, alkali, wash) and solvent stability. Results obtained show that the dyes have excellent dyeing properties attributable to chemical bond formation between the dye molecules and the hydroxyl groups of the substrate (cassava mesocarp). The satisfactory fastness properties and good dye fixation on the substrate are of importance in the preparation of stable and efficient dye modified cellulosic ion exchange resins

Equilibrium and kinetics studies of metal ion adsorption on dyed coconut pollens

Batch equilibration studies were conducted to determine the nature of adsorption of Zn (II) and Cu (II) onto dyed coconut pollens. The nature of adsorption of metal ions was explained using the Langmuirequation. The calculated values of equilibrium parameter indicated favourable adsorption by the adsorbents. Also the calculated values of fractional attainment of equilibrium , the intraparticle diffusion rate constant, Ka show that adsorption of metal ions is particle diffusion controlled. The adsorbent produced from coconut fibre can be used to remove heavy metals from aqueous solution with high efficiency

Studies on dyed coconut (Cocos nucifera) pollens for removal of Cu (II) and Zn (II) from aqeoues solution

The ability of undyed and dyed coconut pollens to remove Cu(II) and Zn(II) from single ion solutions was been studied. The experiments were carried out using coconut pollens (1.0 g) undyed coconut pollens, UDCP, and dyed coconut pollens, DCPI, DCPII and DCPIII of different particle sizes: 0.40, 0.63 and 0.80 mm, respectively. The amount of Cu(II) adsorbed on UDCP, DCPI, DCPII and DCPIII were 69.20, 97.90, 94.70 and 93.10%, respectively, while that of zinc adsorbed on these adsorbents were 87.15,98.30, 92.55 and 90.05%, respectively. These results show that dyed coconut pollens is effective in removing Cu(II) and Zn(II) from aqueous solutions