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Nickel ion removal from aqueous solution using recyclable zeolitic imidazolate framework-8 (ZIF-8) nano adsorbent: A kinetic and equilibrium study

Roostan, Z ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.5004/dwt.2018.21811
  3. Publisher: Desalination Publications , 2018
  4. Abstract:
  5. The adsorption of nickel ions in an aqueous solution system was measured using zeolitic imidazolate framework-8 (ZIF-8) nanoadsorbent. ZIF-8 crystals were synthesized using the hydrothermal method. Nanoadsorbent was characterized by FTIR, XRD, SEM and N2 adsorption analysis. ZIF-8 crystals showed a high surface area of 1303 m2/g and particle size 100–150 nm. The Langmuir and Freundlich isotherms model were used to analyze the data. The sufficiently high R2 value of 0.996 resulted from the Langmuir isotherm model demonstrated the perfect performance of this model. The kinetic data were analyzed using the pseudo-first-order and pseudo-second-order models of types 1–4. Kinetic studies of the adsorption showed that the adsorption process followed the pseudo-second-order kinetics model of type 2. Experimental data showed that the maximal adsorption capacity of nickel by ZIF-8 adsorbent was 69.36 mg/g at initial metal ions concentration 25 mg/L at T = 25°C and pH 7.0. Desorption of nickel from spent ZIF-8 was carried out using 0.1 M EDTA solution effectively and recycled at least four times. No reduction in adsorption efficiency was observed up to 3 cycles of adsorption–desorption. The results confirmed the applicability of ZIF-8 as an effective nanoadsorbent for the removal of nickel ions from aqueous solutions. © 2018 Desalination Publications. All rights reserved
  6. Keywords:
  7. Adsorption ; Aqueous solution ; Isotherm ; Kinetic ; Nickel removal ; Zeolitic imidazolate framework-8 (ZIF-8) ; Desorption ; Ion ; Nanoparticle ; Nickel ; Reaction kinetics ; Zeolite
  8. Source: Desalination and Water Treatment ; Volume 103 , 2018 , Pages 141-151 ; 19443994 (ISSN)
  9. URL: http://www.deswater.com/DWT_abstracts/vol_103/103_2018_141.pdf