Molecular insights into the catalytic oxidation of methanol-to-olefins wastewater with phosphoric acid modified sludge biochar

A novel sludge-based biochar composite adsorbent CS/SBC-H3PO4 for efficient Cr(vi) removal from aqueous solution

“…This is because the impurities in SBC are removed after H 3 PO 4 modification, so the intensity of the chaotic peaks is reduced. 19 In the XRD pattern of CS/SBC-H 3 PO 4 , the intensity of the SiO 2 peak is greatly reduced, which may be caused by CS coating on the surface of SBC-H 3 PO 4 . The comparison of the XRD patterns of SBC, SBC-H 3 PO 4 , CS and CS/SBC-H 3 PO 4 shows that the CS/SBC-H 3 PO 4 composite has been successfully synthesized.…”

“…4d), a new peak representing -NO 2 appears at 398.3 eV. 16 In addition, compared with CS/SBC-H 3 PO 4 before the reaction, the -NH 2 content of CS/SBC-H 3 PO 4 after the reaction decreases from 80.17% to 42.52%, and the -NH 3 + content increases from 19.83% to 25.54%. This is due to the protonation of -NH 2 to -NH 3 + under acidic conditions.…”