Abstract
We have synthesized a dual (UV-Visible) light-responsive heterocomposite photocatalyst of NH2-MIL-125 metal-organic framework (MOF) integrated on a translucent bimodal macro-/meso-porous polymer monolith for decontaminating pharmaceutical pollutants from aqueous medium. FE-SEM-EDAX, HR-TEM-SAED, p-XRD, BET/BJH, XPS, UV-Vis-DRS and PLS instrumental analysis were used to characterize the structural and morphological features of the synthesized MOF-poly(EGDMA) photocatalyst. The electron microscopic analysis confirmed the homogeneous dispersion of MOF across the well-defined porous network of polymer monolith, ensuring easy transport/interaction of pollutant molecules to the photoactive sites for faster dissipation. The hetero composite photocatalyst offered an intriguing band gap energy state that favored excellent dual light-responsive performance for fast decontamination of perennial pharmaceutical organic compounds. The superior photocatalytic performance was guaranteed by optimizing parameters such as solution pH, drug concentration, photocatalyst dosage, sensitizers, matrix tolerance, and light intensity. Under UV and visible light illumination, the maximum drug degradation was achieved using 50 mg of photocatalyst within 0.5 h in the pH range of 6.0–7.0. The drug degradation pathway was monitored using HRMS analysis, and the toxicity evaluation of the identified photoproducts was studied using the ECOSAR program. The MOF-poly(EGDMA) photocatalyst had excellent reusability and durability apart from its superior photocatalytic performance in clean-up applications.
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