To address the recalcitrant degradation of typical contaminants-hexavalent chromiumand (Cr6+) and ciprofloxacin (CIP)-in pharmaceutical wastewater,a photoresponsive functional metal-organic frameworks (MOFs) hybrid membrane,MIL-53(Fe,Cu)@PVDF,was fabricated using polyvinylidene fluoride (PVDF) as the matrix material via a simple mixing method.The surface structure,morphological characteristics,and optical properties of the MOFs membrane were analyzed.The photocatalytic removal efficiency and mechanism of Cr6+ and CIP by MIL-53(Fe,Cu)@PVDF membrane were systematically investigated.The experimental results indicated that the MIL-53(Fe,Cu)@PVDF membrane exhibited large surface porosity and superior photocatalytic performance.Under optimal conditions of 240min of photocatalysis,initial concentrations of 30mg/L for both Cr6+ and CIP,solution pH of 5,and a membrane dosage of 1.5g/L,the removal rates for Cr6+ and CIP reached 100% and 97.57%,respectively.Even after eight cycles,the photocatalytic removal efficiencies for Cr6+ and CIP remained above 80%.The strong oxidizing superoxide radicals (·O-2) generated by photocatalysis and the consumed photo-generated holes (h+) effectively degraded Cr6+ and CIP.The photocatalytic MOFs membrane MIL-53(Fe,Cu)@PVDF represents a promising water treatment material.
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基金资助
辽宁省高校基本科研项目(LJ212410153029)
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