Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 27, Issue 19, Pages 23616-23630Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-08487-9
Keywords
Lead (II) adsorption; Ordered mesoporous carbon (OMC); Functionalized OMC; Adsorption mechanism; XPS analysis
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Funding
- Louisiana Board of Regents (LEQSF) [(2016-17)-RD-C-15]
- department of chemical engineering, department of chemistry, department of biology, and the Energy Institute of Louisiana
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Functionalized ordered mesoporous carbon (MOMC-NP) was synthesized by chemical modification using HNO3 and H3PO4 to enhance Pb(II) adsorption. The phosphate functional group represented by P-O-C bonding onto the surface of OMC was verified by FT-IR and XPS. Batch adsorption experiments revealed the improvement of adsorption capacity by 39 times over the virgin OMC. Moreover, the Pb(II) adsorption results provided excellent fits to Langmuir model and pseudo-second-order kinetic model. The adsorption mechanism of Pb(II) onto MOMC-NP revealed the formation of metal complexes with carboxyl, hydroxyl, and phosphate groups through ion exchange reactions and hydrogen bondings. The calculated activation energy was 22.09 kJ/mol, suggesting that Pb(II) adsorption was a chemisorption. At pH>pH(pzc), the main Pb(II) existing species of Pb(II) and Pb(OH)(+) combine with the carboxyl, hydroxyl, and phosphate functional groups via electrostatic interactions and hydrogen bonding. All these findings demonstrated that MOMC-NP could be a useful and potential adsorbent for adsorptive removal of Pb(II).
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