Mesoporous Material Modified by Poly-O-Phenylene and Aquatic Plants Cellulose for Effective Removal of Hg(II) Ions

Abstract

In this work, a composite adsorbent (modified poly-o-phenylene aquatic plant cellulose; MPP-AC) was prepared by using aminated mesoporous material as the carrier, aquatic cellulose as the dopant, and supporting poly-o-phenylenediamine. The adsorption study indicates that the adsorbent can reach a maximum saturation adsorption capacity of 231.25 mg/g. The data fit analysis reveals that the adsorption of Hg(II) by MPP-AC is consistent with a quasi-second-order kinetic model and followed the Langmuir adsorption isotherm model. The whole adsorption process is a heat absorption process that proceeds spontaneously. Interfering ion experiments show that coexisting cations have almost no competitive effect on the removal of Hg(II), indicating that the adsorbent has good selectivity for Hg(II) adsorption. After five cycles of adsorbent regeneration experiments, the adsorption capacity of MPP-AC can reach 210.27 mg/g, indicating that the adsorbent has good regeneration performance. The composite can be used as an effective, economical, and environmentally friendly potential adsorbent for the adsorption of mercury ions.