Nanocomposites and nanomaterials
Removal of methylene blue and methyl orange from aqueous solutions by ordered micro-mesoporous carbon obtained by the soft-templating method 
Jedynak K., Repelewicz M., Wideł D. 
Jan Kochanowski University, Institute of Chemistry, ul. Swietokrzyska 15 G, 25-406 Kielce, Poland. 
E-mail: kjedynak@ujk.edu.pl

Different pollutants (including dyes) from a constantly evolving industry get into the water. In the textile and dye industry, synthetic dyes are very often used and unfortunately have a harmful effect on human and animal health. Nowadays, the aim is to exploit selective and efficient adsorbents that will adsorb dyes from the aquatic environment in the shortest possible time and with the highest efficiency Ordered micro-mesoporus carbons, due to their unique properties, are gaining more and more interest in adsorption processes. They are characterized by good mechanical stability, high specific surface area, and large pore volume [1].
In this work, ordered micro-mesoporous adsorbent has been studied for the removal of methylene blue (MB) and methyl orange (MO) from aqueous solutions.
The surface properties of carbons were characterized by: nitrogen adsorption isotherms and scanning electron microscopy (SEM), the Boehm’s titration method and the point of zero charge (pHPZC). The efficiency of the adsorption process was analyzed based on the effect of contact time, initial dye concentration and temperature. Adsorption isotherm models (Langmuir and Freundlich) were used to analyze the experimental data. The Langmuir model the best describes the received experimental data. Three various kinetic models (pseudo-first-order, pseudo-second-order, and intraparticle diffusion model) for the adsorption of dyes are also presented. Adsorption of MB and MO on studied carbon material runs according to the pseudo-first-order model and pseudo-second-order model, respectivelly. In addition, thermodynamic parameters were calculated for better explanation of the adsorption process. Obtained data indicated that adsorption processes of methylene blue and methyl orange on studied carbon material were spontaneous and endothermic. These results exhibited that micro-mesoporous carbon materials was effective adsorbent for dyes removal from aqueous solutions.

1.	Jedynak K., Wideł D., Rędzia N. Removal of rhodamine B (a basic dye) and acid yellow 17 (an acidic dye) from aqueous solutions by ordered mesoporous carbon and commercial activated carbon. // Colloids Interfaces -2019.- 3.N 1.-P.30.