Nickel/ions/salts adsorption

To optimize the use of the amorphous sodium titanate powders as catalyst substrates, it is important to fully characterize the ion-exchange properties of the material. Further, the solution properties of the active metal to be loaded onto the support will be an important parameter in the control of the adsorption process. For example, exposure of sodium titanate to a nickel salt solution does not guarantee that nickel will be loaded onto the sodium titanate, or that the nickel, if loaded, will be dispersed on an atomic level. Sodium titanate only behaves as a cation exchange material under certain pH conditions. The solution pH also influences the hydrolysis and speciation of dissolved nickel ions (3), which can form large polymeric clusters or colloidal particles which are not adsorbed by the sodium titanate via a simple ion-exchange process. 

Qiu et al. [22] have demonstrated a technique for removal of Lead, Copper, Nickel, Cobalt, and Zinc from water by application of a Cancrinite type zeolite synthesized from fly ash, by employing molten salt method. The degree of heavy metal adsorption has been reported to vary with the type of ion exchange... 

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