Nanomaterials and nanotechnologies | A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences

Nanocomposite (nc) silver (ag) – sulpho-cation exchanger and sorption of the oxygen (with its removal from water)

3 марта, 2011

In a number of the NanoComposites (NC): Metal – ion exchanger

Me – component is distributed along the porous ion exchange matrix almost uniformly.

Scheme 1. shows the ion exchanger bead (a) and the Me – location for both places : as in the bead pores (5, a) ; so for the pore surfaces (5, b). ( Metals are imaged as cross-hatched on the Scheme 1. (a, b) ).  Me-component occupies the separate areas localized near the ionogenic groups (b)

(a)                                           (b)

Scheme 1

Scheme 1. Representation of the ion exchanger bead (a, left) an the fragment the pore (b, right) for the Me-containing NC: 1 – polymeric chain (R), 2 – micropore, 3 – fixed groups ( -SO3- ), 4 – counter-ion, 5 – Me0 – center (Cu0).

According  to the  microscope  monitoring NanoComposites contain  the Me – NanoParticles with the variation of the size values from 20nm till 500nm.

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Examples for NC (Me – sulpho-cation-exchanger: KU-23 (Ukraine)) are presented on Figs  1:

( I NC, Me0 = Cu0 )     &      ( IINC, Me0 = Ag0 )

( INC, Me0= Cu0 ) – NC : Cu0 – KU-23 in  dependence  of  the number of the cycle (n)  for saturation – reduction  in the process of  the NC formation ( reduction agent – Na2S2O4 ) :

n = 1 n = 2 n = 5 n = 10

Fig 1

( IINC, Me0= Ag0 ) – NC: Ag0 – KU-23  in dependence  of  the  reducing  agents  (a), (b), (c) :

(a) - Na2S2O4 (b) - Na2S2O4 (c) – N2H4

Fig.  2.   MicroPictures  of  the NC  bead  cutoff  (magnification – 10 000), and                Me - NanoParticles Content  Distributions: ( I – NC, Me0= Cu0 ) &  ( II – NC, Me0= Ag0 )

Fig. 1. MicroPictures of the NC bead cutoff (magnification – 10 000), and Me – NanoParticles Content Distributions: ( I – NC, Me0= Cu0 ) & ( II – NC, Me0= Ag0 )

It is shown  that the Me – NanoParticles size  in the resin bead (Fig. 1) is  significant.

Such NanoMaterials as the NC are interesting due to the enhanced activity of the NanoSized Metal, and  to the  combination of the electrone- (redox-) and IEx  properties. This  combination makes the NC as effective sorbents, in particular, for the removal of the soluble oxygen  during the process of  water-conditioning.

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Nature of  the Me-component  in  the NC ( Me0 = Cu0 (a) and Me0= Ag0 (b)) determines Parameters  of the multi – stage  Process with the participation of  such  NanoMaterials.

Figs. 2 show the oxidation Process (to the moment for 40% of  the oxidation).

(a) Cu0 ; Cu2+ ß Cu0_KU23 (b) Ag0 ; Ag+ ß Ag0_KU23

Fig 3

Fig 4

Fig. 2. Micropictures  of   the NC-bead cutoff :  Copper Cu0 , (a, left )  & Silver Ag0 (b, right ) containing NC.  To the left  (a) – moving (during the Process) boundary   between Cu0 and  Cu2+ states in the bead.

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(a) Fuji  CS-07  (Japan)                          (b) Duolite  A 365  (USA)

Fig 5

Fig 6

(c) AV-17-10 P_g   (Russia)                           (d) AV-17-8  (Russia)

Fig 7

Fig 8

Fig. 3 (a-d). Micropicture  of   the silver containing (Ag0 )  bead cutoff  for NC, obtaining by the authors on the basis of  the various  anion exchangers (a – d).

Principal researcher of the Laboratory of Physicochemical Principles of Chromatography and Gas Chromatography–Mass Spectrometry, Anatoliy Iv. Kalinitchev, Doctor of Science (Chemistry)


Novelty book «Nanocomposity metal – ion exchanger»

17 апреля, 2010

THE MONOGRAPH  T.Kravchenko (VSU), L. Polyanskiy (VSU), A.Kalinitchev (IPСE RAS), D.Konev (VSU) “NANOCOMPOSITY METAL – ION EXCHANGER”. Voronezh State University (VSU), 2009 – M.: “Nauka” ( “Science” ), 391p.

The Monograph is approved for publication by two Scientific Councils :
A.N. FRUMKIN Institute of Physical Chemistry & Electrochemistry RAS, VORONEZH State University

Book

Annotation

  • Energy saturated Nano Composites ( NC ) materials: “Metal – ion exchangers” are considered in  the  Monograph.  The Nano Composites are used  for  the  intensification  of   the chemical, electrochemical  and  sorption processes  in NanoScience.
  • There  are underlined advantages of the ion exchange (IEx) matrixes for the  chemical directional synthesis, stabilization of the Metal NanoParticles (NP) and realization of the desired process in the NanoPorous space of the matrixes.
  • It  is  systematizated and generalized the available information  concerning known classes of the NC Metal – ion exchangers.
  • For  the  first time in the full size there are presented the fundamental physico-chemical basis of the redox-sorption, which play the definite role in the  generation and application of  the NC Metal-ion exchangers as the sorbents : thermodynamics, macrokinetics and dynamics. It is shown the accelerating operation of the Nano-Sized factors.
  • The  are given the theoretical reasons  of the sorption methods with  the NC usage and described the installations for the economical and ecological advisable removal of the molecular oxygen from liquids  and gases including concentrating of heavy metals from the complex compositions in solutions.

For  the specialists  in the field of the physical chemistry  of the NanoSystems, sorption and oxidation-reaction processes and technology for water treatment, removal of the oxygen from gases, corrosion protection, recovery and concentrating of Metals, environmental protection.

Principal researcher of the Laboratory of Physicochemical Principles of Chromatography and Gas Chromatography–Mass Spectrometry, Anatoliy Iv. Kalinitchev, Doctor of Science (Chemistry)


 
 
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