Dual-functional Ti3C2 MXene/CuFe2O4 composite for visible light-driven degradation of ofloxacin in the presence of HSO5-and production of green H2 via photo-reforming

초록

In this study, composite of Ti3C2 MXene and CuFe2O4 was prepared and used for visible light-driven ofloxacin (OFX) degradation and green hydrogen (H2) production. The OFX is one of the most widely used antibiotics and frequently found to contaminate water resources of drinking water supplied. The prepared MXene/CuFe2O4 significantly removed OFX and decomposed 73 % OFX compared to 57 % and 14 % for CuFe2O4 alone and MXene alone, respectively, under the same experimental conditions in this study. The efficiency of MXene/ CuFe2O4 composite for removing OFX was promoted from 73 % to 88 % by adding HSO5- at 10 mg/L OFX, 100 mg/L HSO5- , and 500 mg/L MXene/CuFe2O4. The high OFX removal by MXene with HSO5- could result from the effect of HSO5 -to promote the separation of charged species as well as the production of hydroxyl radical (center dot OH) and sulfate radical (SO4 center dot- ). Both high reactivities of OFX, i.e., 3.9 x 109 and 4.1 x 109 M- 1 s- 1 with center dot OH and SO4 center dot- , respectively, and declined OFX degradation in the presence of radical scavengers confirmed the effective role of these radicals in OFX degradation. OFX degradation significantly depended on operating parameters of concentrations of catalyst, OFX and HSO5- , pH values of solutions, and the presence of inorganic ions. The prepared composite proved high mechanical stability and reusability in its application of water treatment. Moreover, the prepared MXene/CuFe2O4 confirmed its effectiveness to produce H2 with a rate of 2374.6 mu mol h- 1 g- 1. Degradation pathways of OFX were established and estimated ecotoxicities of OFX as well as its degradation products. The high OFX degradation efficiency and high H2 production by MXene/CuFe2O4 suggest its high potential in the treatment of emerging pollutants and green energy economy.

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