Table 6 Fitted C 1s, O 1s, Cd 3d, and Fe 2p peak parameters deduced from the XPS analysis for MBC2 after the Cd(II) ion sorption
From: Investigations of Heavy Metal Ion Sorption Using Nanocomposites of Iron-Modified Biochar
Region | Peak [eV] | Assignment | Atomic content [%] |
|---|---|---|---|
C 1s | 284.5 | C=C sp2 | 72.7 |
286.2 | C–OH, C–O–C | 7.8 | |
287.3 | C=O | 4.3 | |
288.5 | COO– | 6.1 | |
289.6 | Carbonates | 4.9 | |
291.2 | π → π* | 4.2 | |
O 1s | 530.2 | Metal oxides | 32.7 |
531.4 | C=O | 35.8 | |
532.3 | O=C–OH, C–OH | 22.7 | |
533.3 | C–O–C | 8.7 | |
Cd 3d | 405.6 | CdCO3, Cd(OH)2, –OCdOH | 100 |
412.4 | – | – | |
Fe 2p | 708.6 | Fe(0) | 2.4 |
709.6 | Fe(II) | 4.9 | |
710.6 | 2.4 | ||
714.9 | 2.4 | ||
710.6 | Fe(III) | 31.9 | |
711.6 | 24.0 | ||
712.6 | 16.0 | ||
713.6 | 8.0 | ||
719.5 | 8.0 |