Abstract
In this study, we have developed a magnetic MrGO/Ag2WO4 composite to remove lomefloxacin (LOM) via the synergistic effect of adsorption and photocatalysis in water. After 20 min of dark reaction and 120 min of visible light reaction, the MrGO/Ag2WO4 composite can remove 93.62% of LOM, and the removal effect is still 85.49% after four cycles, the maximum adsorption capacity is 117.93 mg/g. Compared with MrGO and MrGO/Ag2WO4 separately, the ability of MrGO/Ag2WO4 composite to remove LOM increased by 2.15 and 7.25 times. The e−, h+, •OH, and •O2− all play an essential role during degradation. Moreover, the high activity of MrGO/Ag2WO4 composite material is attributed to the excellent adsorption performance and the formation of Z-scheme heterojunction, which effectively aggregates organic matter and inhibits the recombination of photogenerated carriers. Finally, the adsorption and photocatalytic mechanism of MrGO/Ag2WO4 composite materials for LOM are discussed, the adsorption process of the LOM by MrGO/Ag2WO4 composite is more suitable for the Langmuir isotherm adsorption model and may be more inclined to a monolayer system. The results suggest that MrGO/Ag2WO4 holds a high potential of being an environmentally friendly and recyclable composite catalyst for LOM removal from water.
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