Adsorption and one-step degradation-regeneration of 4-amino-5-hydroxynaphthalene-2,7-disulfonic acid using biochar-based BiFeO3 nanocomposites

Add time:09/02/2019    Source:sciencedirect.com

A microwave (MW)-assisted-H2O2 technique used to revise 4-amino-5-hydroxynaphthalene-2,7-disulfonic acid (H-acid)-saturated biochars (BCs) was investigated in detail. This method could simultaneously degrade the H-acid adsorbed in the BCs-based BiFeO3 (BFO) nanocomposites (BFO/BCs), in which BFO was used as dopant intercalated into BC, and activate the used BCs. Because H-acid could be decomposed by OH, which was generated in a coexistent system, including MW irradiation, H2O2, and BCs. It’s worth noticing the adsorption capacity was (236.8 mg g−1) 1.1-fold higher than that of unused BFO/BC (211.7 mg g−1). It indicated that the surplus OH exhibited a cooperative effect with MW irradiation to restore H-acid-saturated BCs via the cleavage of CC bond, thereby forming carboxylic groups and the pyrolysis effect. Findings indicated that the one-step degradation-regeneration method could effectively promote the adsorption capacity of H-acid-saturated BCs in a few minutes and could thus be considered a potential technology in water treatment.

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