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 Pb 2+ 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 × 10–2 cm 2 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.
|Advisor:||Gang, Daniel D.|
|Commitee:||Buchireddy, Prashanth R., Tatar, Jovan, Zhou, Xiaodong|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 58/05M(E), Masters Abstracts International|
|Subjects:||Environmental science, Environmental engineering, Materials science|
|Keywords:||Adsorption, Lead, Ordered mesoporous carbon (OMC), Phosphate modified OMC|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
supplemental files is subject to the ProQuest Terms and Conditions of use.