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Removal of heavy metal ions from water by an combined sorption–crystallization process using activated clays

Authors
  • Myasnikov, S. K.1
  • Tikhonov, A. Yu.1
  • Chipryakova, A. P.1
  • Kulov, N. N.1
  • 1 Russian Academy of Sciences, Kurnakov Institute of General and Inorganic Chemistry, Leninskii pr. 31, Moscow, 119991, Russia , Moscow (Russia)
Type
Published Article
Journal
Theoretical Foundations of Chemical Engineering
Publisher
Pleiades Publishing
Publication Date
Jul 01, 2016
Volume
50
Issue
4
Pages
366–382
Identifiers
DOI: 10.1134/S0040579516040436
Source
Springer Nature
Keywords
License
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Abstract

The degree of comminution of materials in an ultrasonic field has been theoretically estimated by calculating the maximum and minimum energy inputs necessary for this process (upper and lower estimates have been obtained). The degree of comminution of kaolin in an ultrasonic bath determined by light and electron microscopy is in satisfactory agreement with the theoretical estimates. The efficiencies of heavy metal ion (Cu2+, Ni2+) removal from aqueous solutions in the following processes have been compared: adsorption on natural materials (kaolin and bentonite), chemical precipitation in homogeneous crystallization, and integrated sorption–crystallization process using activated clays. The highest purification efficiency has been attained in the integrated process preceded by ultrasonication of the clay slurry and alkaline reagent. Use of these sonochemically activated additives has shortened the duration of the integrated process and has increased the degree of removal of toxic metals to 102–103. Clays have been demonstrated to act as a sorbent, a heterogeneous crystallization stimulator, and a coagulant accelerating the sedimentation of the solid phase.

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