Mesoporous Carbons of Well-Organized Structure in the Removal of Dyes from Aqueous Solutions.

Magdalena Blachnio,Anna Derylo-Marczewska,Szymon Winter,Malgorzata Zienkiewicz-Strzalka

doi:10.3390/molecules26082159

Magdalena Blachnio, Anna Derylo-Marczewska + Show 2 more

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https://doi.org/10.3390/molecules26082159

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Abstract

Mesoporous carbons with differentiated properties were synthesized by using the method of impregnation of mesoporous well-organized silicas. The obtained carbonaceous materials and microporous activated carbon were investigated by applying different methods in order to determine their structural, surface and adsorption properties towards selected dyes from aqueous solutions. In order to verify applicability of adsorbents for removing dyes the equilibrium and kinetic experimental data were measured and analyzed by applying various equations and models. The structural and acid-base properties of the investigated carbons were evaluated by Small-Angle X-ray Scattering (SAXS) technique, adsorption/desorption of nitrogen, potentiometric titration, and Transmission Electron Microscopy (TEM). The results of these techniques are complementary, indicating the type of porosity and structural ordering, e.g., the pore sizes determined from the SAXS data are in good agreement with those obtained from nitrogen sorption data. The SAXS and TEM data confirm the regularity of mesoporous carbon structure. The adsorption experiment, especially kinetic measurements, reveals the utility of mesoporous carbons in dye removing, taking into account not only the adsorption uptake but also the adsorption rate.

Highlights

IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
The synthesis of mesoporous carbons was modification of the hard-templating method [67], i.e., impregnation of mesoporous silicas with the carbon precursor followed by the carbonization process
The Small-Angle X-ray Scattering (SAXS) technique indicates the pore size for the W1, W2, and W3 samples (6.3 nm, 3.8 nm, and 3.3 nm, respectively) that is in good agreement with the nitrogen sorption results

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Even at very low concentrations, are undesirable due to their hazardous effects on flora, fauna and human beings. The decolorization process of water resources is of great significance. Brighter colours and better resistance of synthetic dyes to environmental factors resulted in almost complete displacement of natural dyes from their common usage. Synthetic dyes are widely applied in the textile, pharmaceutical, food processing, leather tanning, cosmetics, plastics, photographic and paper industry

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