Preparation of manganese oxides coated porous carbon and its application for lead ion removal

Add time:09/06/2019    Source:sciencedirect.com

In this study, porous carbon (PC) was prepared from pyrolysis of sodium carboxymethyl cellulose (CMC) and was further treated with KMnO4 to fabricate manganese oxides coated PC (MnOx/PC). SEM, BET, XPS and FTIR technology were employed to explain their structures. Batch adsorption experiments for Pb(II) were carried out to estimate their adsorption performance. Results showed that manganese oxides coating onto the PC caused the decrease of microporous surface area and microporous volume, while the oxygen content increased greatly. Both PC and MnOx/PC exhibit excellent absorption performance for Pb(II) and their maximum adsorption capacity were 0.6054 and 1.2297 mmol g−1 (about 125.44 and 254.79 mg g−1), respectively. The adsorption process of Pb(II) was quick and pH-dependent. The absorption kinetic and thermodynamic process were fitted well with pseudo-second-order model and Langmuir isotherm model, respectively, suggesting that Pb(II) adsorption onto the sorbents were a chemical process and monolayer adsorption were reached.

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