19 Because of its enormous porosity and mesoporous structure, MIL-101 is a highly significant material that is being researched extensively for drug delivery, 19 adsorption, 20 and catalysis. 21 This study elucidates new applications of MOF structures, particularly emphasizing on terephthalic acid-based MOFs with Cr as central metals and modified with waste eggshell-derived CaCO 3 , employed as innovative photocatalysts for degradation processes in wastewater treatment.
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Waste eggshell derived CaCO<sub>3</sub> modified MIL-101(Cr) for response surface methodology optimized photocatalytic malachite green degradation.
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Although higher light intensity increases photon availability, an unexpected trend was observed: the chemical oxygen demand removal efficiency increased slightly as the distance increased up to 100 cm (22 900 lux, 96.2% removal), beyond which it declined at 125 cm due to insufficient photon flux.
Analysis of the Nyquist plots showed a clear trend in charge transfer resistance ( R ct ), following the order: MIL-101(Cr) > CaCO 3 > waste eggshell-derived CaCO 3 @MIL-101(Cr) composite.