EDTA-functionalized KCC-1 and KIT-6 mesoporous silicas for Nd3+ ion recovery from aqueous solutions

By S. Ravi, Siqian Zhang, Yu-Ri Lee, K. Kang, Ji-Man Kim, Ji-Whan Ahn, W. Ahn. Journal of Industrial & Engineering Chemistry, 2018

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Abstract Ethylenediaminetetraacetic acid (EDTA)-functionalized KIT-6 and KCC-1 mesoporous silicas were prepared via post-synthesis grafting and examined for their ability to promote the recovery of rare earth metal ions such as Nd3+ from an aqueous medium. The obtained adsorption isotherms were fitted to the Langmuir model, which gave a maximum adsorption of Nd3+ ions of 109.8 and 96.5 mg/g for KIT-6-EDTA and KCC-1-EDTA, respectively, at 25 °C and pH 6. The adsorption kinetic profile of KIT-6 was faster than KCC-1. KIT-6 was also proved to be more stable against desorption under acidic regeneration conditions.

Subfields: Industrial and Manufacturing Engineering, Inorganic Chemistry, Water Science and Technology

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