Synthesis of magnetic biochar-supported Fe-Cu bimetallic catalyst from pulp and paper mill wastes for the Fenton-like removal of rhodamine B dye

Treating the wastes generated from pulp and paper mills, such as black liquor and Fenton sludge is challenging. In this study, the biochar-supported Fe-Cu bimetallic catalysts were synthesized by a one-step pyrolysis method using Fenton sludge as iron source, acid-precipitated black liquor (APBL) as carbon source and copper nitrate as copper source. The catalysts were used to remove rhodamine B (RhB) dye from aqueous solution by Fenton-like reaction. The optimal catalyst (FeCu@BC600-2) was pyrolyzed at 600 degrees C with an Fe/Cu mixing ratio of 2 and consisted of mesoporous biochar supported nanoscale Fe3O4 and Cu0. It had a specific surface area of 104.6 m2 & sdot;g  1 and a saturation magnetization of 33.3 emu & sdot;g  1. In the FeCu@BC600-2/H2O2 system, RhB dye (10 mg & sdot;L-1) was completely removed within 60 min at acidic pH (initial pH 3, 0.2 g & sdot;L-1 catalyst, 1 mM H2O2) or 6 h at neutral pH (initial pH 7, 0.25 g & sdot;L-1 catalyst, 25 mM H2O2) at 30 degrees C. Moreover, the FeCu@BC600-2 exhibited good magnetic separation ability, low metal leaching, excellent reusability and broad applicability to other synthetic dyes. The dye removal mechanism involved the synergistic effect of adsorption and catalytic oxidation (especially heterogeneous catalytic oxidation). At acidic pH, RhB degradation was due to center dot OH radical, which was generated from the activation of H2O2 by equivalent to Cu(I) or Cu(I) oxidized from Cu0 and equivalent to Fe(II) in Fe3O4. At neutral pH, RhB degradation was mainly due to center dot OH and 1O2 with the former being produced by equivalent to Cu(I) and equivalent to Fe(II). Furthermore, Cu(I) oxidized from Cu0 and the active functional groups (such as sp2 C = C) in the biochar facilitated the reduction of Fe(III) to Fe(II), resulting in a high catalytic oxidation efficiency.