Abstract
AbstractIn this study, the activated carbon (TmAC) with a high surface area and appropriate pore distribution was produced from einkorn (Triticum monococcum L.) husks by using ZnCl2 with chemical activation method. The efficiency of the obtained activated carbon on the adsorption of anionic (metanil yellow) and cationic (methylene blue) dyestuffs from aqueous solutions was investigated in more detail. In addition, the surface characterization of activated carbon was performed using thermogravimetric analysis-differential thermal analysis (TGA-DTA), elemental analysis, scanning electron microscopy (SEM) images, Brunauer–Emmett–Teller (BET) specific surface areas, N2 adsorption–desorption isotherms, pore volumes, pore size distributions, and Fourier-transform infrared spectroscopy-attenuated total reflection (FTIR-ATR) spectra. The highest surface area of activated carbon was measured as 1321 m2 g−1 at the carbonization temperature of 500 °C by using impregnation ratio (w/w = 2.0). Batch method was used in adsorption experiments. The parameters affecting the adsorption studies such as adsorbent concentration, initial dye concentration, adsorption time, temperature, and pH were investigated. The adsorption mechanisms of metanil yellow (MY) and methylene blue (MB) on activated carbon were explained by using isotherms (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich), kinetic models (pseudo-first-order and pseudo-second-order), and the thermodynamic parameters (Gibbs free energy, enthalpy, and entropy).
Graphical Abstract
Publisher
Springer Science and Business Media LLC
Reference83 articles.
1. Abbas, M., & Trari, M. (2015). Kinetic, equilibrium and thermodynamic study on the removal of Congo Red from aqueous solutions by adsorption onto apricot stone. Process Safety and Environmental Protection, 98, 424–436. https://doi.org/10.1016/j.psep.2015.09.015
2. Abdullah, S. S., Yusup, S., Ahmad, M. M., Ramli, A., & Ismail, L. (2010). Thermogravimetry study on pyrolysis of various lignocellulosic biomass for potential hydrogen production. International Journal of Chemical and Molecular Engineering, 4(12), 750–754.
3. Aguayo-Villarreal, I. A., Hernández-Montoya, V., Bonilla-Petriciolet, A., Tovar-Gómez, R., Ramírez-López, E. M., & Montes-Morán, M. A. (2013). Role of acid blue 25 dye as active site for the adsorption of Cd2+ and Zn2+ using activated carbons. Dyes and Pigments, 96(2), 459–466. https://doi.org/10.1016/j.dyepig.2012.08.027
4. Ahmad, A. A., Al-Raggad, M., & Shareef, N. (2021). Production of activated carbon derived from agricultural by-products via microwave-induced chemical activation: A review. Carbon Letters, 31, 957–971. https://doi.org/10.1007/s42823-020-00208-z
5. Alberti, G., Amendola, V., Pesavento, M., & Biesuz, R. (2012). Beyond the synthesis of novel solid phases: Review on modelling of sorption phenomena. Coordination Chemistry Reviews, 256(1–2), 28–45. https://doi.org/10.1016/j.ccr.2011.08.022