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1

Determination of inter-layer and structuraliron content in Murunkan Clay

 K.A.T.A. Perera and M. Koneswaran

 Sri Lanka Institute of Nanotechnology (SLINTE!

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Company Confidential2

IntroductionMontmorillonite (MMT) and bentonite belongs to the general family of 2:1

layered silicates

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Company Confidential3

 

• The smectite content of bentonite and montmorillonites can be

improvedremoving the associated gangue compounds

  sand, gravel, quartz, feldspars

  calcite, iron humic acids

• Isomorphic substitution within the layers generates negativecharges

• That are normally counter balanced by cations residing in the inter-layer space

•  These irons can be stayed in two places in the clay. (a In betweenthe layers. (b In the structure of the clay

Cont……………

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Company Confidential4

Experimental

0!00g montmorillonite clay

!00 ml of 0!M "Cl

stirred for 30 min#tes

$e%t #ntil all the clay %articles settle do&n

s#%ernatant &as se%arated

'e%eat the %roced#re 10 times

Clay sam%le

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Company Confidential!

"Cl treated clay sam%le

igested com%letely

The elemental analysis was carried out using !tomic absorption spectroscopy.

igested clay sam%le

Cont……………

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Company Confidential

Results and Discussion

Figure 1: XRD pattern of the clay sample after the acid treatment 

This *' %attern %ro+es that the str#ct#re of the clay &as not

damaged d#ring the "Cl treatment

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The supernatant of the "Cl treated clay samples were studied using !!# to

determine the inter-layer iron content

$%traction

Iron concentration

in the supernatant(mg&g

'st e%traction .)*

+nd e%traction .)

rde%traction .))

th

e%traction /.*the%traction /.'

/th e%traction .+

th e%traction .+)

*th e%traction +.+*

0th e%traction +.'

')th e%traction '.)*

Table 1: Atomic Absorption Spectroscopy data of supernatants of HCl treated clay 

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Company Confidential-

1rom the batch e%traction process interlayer iron concentration

of montmorillonite clay was determined

!fter the batch e%traction process clay sample was completely

digested and structural iron concentration was determined

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Company Confidential.

Conclusions

/nterlayer iron concentration of montmorillonite 4,20mgg

str#ct#ral iron concentration of montmorillonite 210 mgg

 

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Company Confidential10

References:

1.H T. Chi-Nhan, G. C. Anne, R. Laurence, O. Fumihiko, T.H. Huy, D. Lauren. !e"araion

an# "urificaion of monmori$$onie an# "o$yehy$ene o%i#e mo#ifie# monmori$$onie from

&ienamese 'enonies , Applied Clay Science 49 ()*1*+ )))/

). O.A'o$$ino, A.Giacomino, 0.0a$an#rino,.0enasi. 2neracion of mea$ ions 3ih

monmori$$onie an# 4ermicu$ie,  Applied Clay Science38 ()**/+))5-)6

. 7.A. Gon89$e8, 0. #e$ C. Rui8, $eachin; of kao$in an# c$ays 'y ch$orinaion of iron an#ianium,  Applied Clay Science  ()**6+ )1))