| Summary: | <p>Adsorption of Pb2+ onto ordered mesoporous Carbon (OMC) modified by nitric and phosphoric acid was investigated with variations of the parameters, such as pH, contact time, temperature, and initial concentration. Optimum Pb2+ adsorption was observed at a pH value of 5. Modified OMC was characterized by Nitrogen Adsorption-Desorption Isotherm, FT-IR, SEM, EDS, and TEM. The time required to reach equilibrium was between 20 mins and 30 mins. The equilibrium adsorption capacity of modified OMC (MOMC-NP) increased with the increase of temperature indicating that the process of Pb2+ adsorption is an endothermic process. The equilibrium adsorption capacity of MOMC-NP was found to be 56.06, 68.82, and 77.8 mg g-1 at an initial concentration of 60, 80, and 100 mg L-1 of Pb2+, respectively. Kinetics studies suggested a better applicability of Pseudo-Second-Order kinetics model. Linear and non-linear isotherm studies suggested that the experimental data was better fitted to the Langmuir isotherm model. Additionally, the results also indicated that the modified finite-bath diffusion model fitted the experiments very well, with a diffusion coefficient of 1.63 ? ?10?</p><p>(-2) cm2 s-1. On the basis of above information, the ordered mesoporous carbon (OMC) modified by nitric acid and phosphoric acid can be employed as an potentially effective adsorbent for Pb2+ removal.
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