Preparation of CuCl2 modified biochar for levofloxacin removal from municipal wastewater
Abstract
The residual quantities of levofloxacin (LFX) in the ecology have caused extremely serious problems due to the misuse of LFX. Copper-modified biochar (Cu-BC) is prepared by co-pyrolysis of CuCl2 with fir sawdust (FS) for LFX removal by adsorption, activation of peroxydisulfate (PDS) degradation and the photocatalytic degradation process. The physicochemical properties of the Cu-BC were investigated and analyzed, which include Cu, Cu2O, and CuO. Cu-BC can adsorb LFX with an adsorption amount of 97.35 mg/g, which is larger than that of the original biochar (BC). The π-π interactions, H-bonding, and surface functional groups are responsible for LFX adsorption, based on adsorption mechanism analysis. Cu-BC activation PDS can highly efficient realize LFX removal. The e- generated from the Cu+/Cu2+ cycling are gathered around Cu to form the electron-rich center for achieving activation of PDS degradation of LFX, reducing its toxicity. While 1O2 and SO4•- significantly influence the LFX degradation process, based on degradation mechanism analysis. Besides, the Cu-BC can be used as the photocatalyst for LFX removal owing to the existence of Cu2O. The photocatalytic degradation mechanism of LFX is also put forward.
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