Flame Photometry Characterization Procedure for Sodium Content in Brazilian Bentonites for Nanotechnology Applications

Author(s): Hellen S. Santos, Karine L. Buarque da Silva, Ariel E. Zanini, Danilo S. Coelho, Marcelo Embiruçu, Marcio L.F. Nascimento*.

Journal Name: Recent Innovations in Chemical Engineering
Formerly: Recent Patents on Chemical Engineering

Volume 12 , Issue 2 , 2019

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Graphical Abstract:


Background: Brazilian bentonites have a low sodium concentration in their interlayer structure. This is a problem with most of the industrial applications that demand the characteristics of sodium bentonites.

Objective: As a solution for this limitation, sodium carbonate is added to in natura clays, promoting ion exchange between other interlayer cations with sodium.

Methods: A process was used based on the principle of Stokes’ Law (BR Patent 10 2013 016298). For this, we used four glass columns in series, in which a high water flow was considered to obtain purified clays. It was proposed as a simple, fast and economical method for sodium determination that was developed and applied in bentonites by flame photometry. The equipment calibration was performed with a NaCl standard solution in concentrations between 80 and 110 ppm. The bentonites in the suspension were separated by means of centrifugation, being thus analyzed by a flame photometer.

Results: The samples were prepared according to the manufacturer’s specifications to contain detectable amounts of sodium by means of flame photometry. A resulting linear relationship between the average value readings versus sodium standard content solution (both in ppm) was obtained by the logarithmic scale, as expected.

Conclusion: The procedure allowed to define a method that could be used in the sodification control process, thus making it possible to differentiate the sodium cation content in terms of the value of cation exchange capacity (CEC) from bentonite. X-ray analysis of in natura and the sodified clays showed nanostructural differences related to interlayer distance.

Keywords: Clay, bentonite, sodium procedure characterization, flame photometry, nanotechnology, cation exchange capacity.

Santos PS. Ciência e Tecnologia de Argilas, Vol. 1. Ed Edgard Blücher Ltda 1992; 408 (in Portuguese)
Neves LE. Estudo prático de argilas por difratometria de raios-X. Boletim Técnico da Petrobras 1968; 11: 123-35. (in Portuguese).
Zanini AE. Seleção, purificação e modificação de argilas para aplicação em nano-sistemas 1D.PhD Thesis. Federal University of Bahia 2013. (in Portuguese).
Alves JL, Zanini AE, de Souza ME, Nascimento MLF. Study of selection and purification of Brazilian bentonite clay by elutriation: A XRF, SEM and Rietveld analysis. Ceramica 2016; 62: 1-8.
Solvay Chemicals http://www.solvaychemicals.us/ EN/Products/sodiumproducts/sodaash.aspx page accessed September 25, 2013.
Virta RL. Clay and Shale US Geological Survey Minerals Yearbook. 2003; pp. 1-26.
Barnes RB, Richardson D, Berry JW, Hood RL. Flame photometry: A rapid analytical procedure. Ind Eng Chem Anal Ed 1945; 17: 605-11.
Steck DA. Sodium D Line Data. Los Alamos National Laboratory - Technical Report. 2000.
Hald PM. The flame photometer for the measurement of sodium and potassium in biological materials. The J Biol Chem 1947; 167: 499-510.
Ramsay JA. The determination of sodium in small volumes of fluid by flame photometry. J Exp Biol 1950; 27: 253-499.
Chen MJ, Hsieh YT, Weng YM, Chiou RYY. Flame photometric determination of salinity in processed foods. Food Chem 2005; 91: 765-70.
Ribani M, Bottoli CBG, Collins CH, Jardim JCSF. Validação em Métodos Cromatográficos e Eletroforéticos. Quim Nova 2004; 27: 771-80. [in Portuguese].
Zanini AE, Nascimento MLF, de Souza ME, de Carvalho LH. Processo de seleção, purificação e modificação físico-química de sistemas particulados via elutriação matricial iterativa e produtos aperfeiçoadosPatent BR 10; 016298. 2013. (in Portuguese).
Walsh EG. Internal standard flame photometry. J Sci Instrum 1952; 29: 23-5.
Nascimento MLF, Zanotto ED. Diffusion processes in vitreous silica revisited. Phys Chem Glasses 2007; 48: 201-17.
Albers APF, Melchiades FG, Machado R, Baldo JB, Boschi AO. Um método simples de caracterização de argilominerais por difração de raios x. Ceramica 2001; 48(1): 34-7. [in Portuguese].
Lee JY, Lee HL. Characterization of organobentonite used for polymer nanocomposite. Mater Chem Phys 1999; 15: 11-29.
Cerqueira RC, Pereira CC, Santiago MA, Midlej KC, Martins VS, Nascimento MLF. Selection, modification and purification of natural and sodified clays by a patented process: Analysis using ICP-MS and rietveld. Recent Pat Mater Sci 2018; 11: 1-7.

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Article Details

Year: 2019
Page: [122 - 129]
Pages: 8
DOI: 10.2174/2405520412666190404144547
Price: $65

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