Extraction of indium from sulfuric acid solutions to carbon composites modified with nanotubes

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The regularities of the sorption extraction of indium from sulfuric acid solutions using composites based on activated carbons modified with carbon nanotubes are considered. Their surface was studied by scanning electron microscopy. The equilibrium and kinetic characteristics of the sorbents are obtained. Indium sorption isotherms have a convex shape and are described by the Langmuir equation. The approximation of kinetic data using pseudo-first and pseudo-second order models, internal diffusion, and Elovich showed that the highest correlation coefficient is observed when using a pseudo-second order model. The process of indium sorption is limited by external diffusion. The efficiency of the carbon composite during the extraction of indium in four sorption-desorption cycles has been verified.

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Sobre autores

A. Gakiev

Mendeleev University of Chemical Technology of Russia (MUCTR)

Autor responsável pela correspondência
Email: gakievadam@gmail.com
Rússia, Moscow, 125047

I. Troshkina

Mendeleev University of Chemical Technology of Russia (MUCTR)

Email: gakievadam@gmail.com
Rússia, Moscow, 125047

A. Kryukov

Mendeleev University of Chemical Technology of Russia (MUCTR)

Email: gakievadam@gmail.com
Rússia, Moscow, 125047

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2. Fig. 1. Surface of modified activated carbon coated with carbon nanotubes, magnification ×15000 (a) and ×50000 (b).

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3. Fig. 2. Isotherms of indium sorption by nanomodified composite and activated carbon (a) and their anamorphoses (b): 1 – Tatsorb-CNT-1, 2 – Tatsorb-CNT-2, 3 – Tatsorb.

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4. Fig. 3. Integral kinetic curves of indium sorption from sulfuric acid solutions by carbon composites and unmodified activated carbon: 1 – Tatsorb-CNT-1, 2 – Tatsorb-CNT-2, 3 – Tatsorb.

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5. Fig. 4. Dependences lg(Qe – Qt) = f(τ) (a); t/Qt = f(τ) (b); Qt = f(√τ) (c); Qt = f(ln τ) (g); for indium sorption by carbon composites and activated carbon: 1 – Tatsorb-UNT-1, 2 – Tatsorb-UNT-2, 3 – Tatsorb.

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