Selective Adsorption of Methyl Orange and Methylene Blue by Porous Carbon Material Prepared From Potassium Citrate

Song Wang; Jiali Dou; Tingting Zhang; Sanxi Li; Xuecheng Chen

doi:10.1021/acsomega.3c04124

Selective Adsorption of Methyl Orange and Methylene Blue by Porous Carbon Material Prepared From Potassium Citrate

ACS Omega. 2023 Sep 15;8(38):35024-35033. doi: 10.1021/acsomega.3c04124. eCollection 2023 Sep 26.

Authors

Song Wang¹, Jiali Dou¹, Tingting Zhang¹, Sanxi Li¹, Xuecheng Chen^{1

2}

Affiliations

¹ School of Environmental and Chemical Engineering, Shenyang University of Technology, Shenyang 110870, China.
² Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Piastów Ave. 42, 71-065 Szczecin, Poland.

Abstract

As the discharge amount of dye wastewater increases with the development of the textile printing and dyeing industries, the treatment of the dyes in the wastewater becomes more complex. The adsorption method is a commonly used method for treating dye wastewater. The adsorbent is the key factor affecting the adsorption performance. To develop a high-performance adsorbent, a porous carbon material prepared from potassium citrate by the calcination method was applied in the adsorption of dye-containing water in this study. The morphology and pore structure of the porous carbon materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and N₂ adsorption/desorption isotherm. The porous carbon material with a specific surface area of 1436 m² g^-1, PC-900, was used as an adsorbent for the adsorption of methyl orange (MO) and methylene blue (MB). The results showed that the maximum adsorption capacity of PC-900 for MO and MB reached 927 and 1853.6 mg g^-1, respectively. Studies on adsorption kinetics and adsorption isotherms showed that the pseudo-second-order kinetic model and the Langmuir isotherm model were more appropriate to describe the adsorption process of MO and MB by PC-900. In addition, the results of the mixed adsorption experiment of MO and MB dyes showed that PC-900 had selective adsorption for MB.