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

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)


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