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Ultrastable Luminescent Hybrid Bromide Perovskite@MOF Nanocomposites for the Degradation of Organic Pollutants in Water
摘要： Hybrid bromide perovskites (HBPs) have emerged as promising candidate in optoelectronic applications, although instability of the materials under working conditions has retarded the progress towards commercialization. As a rational approach to address this core issue, we herein report the synthesis of a series of ultrastable composite materials, wherein HBP nanocrystals (NCs) have been stabilised within a well-known chemically stable metal-organic framework (MOF) viz. zeolitic imidazolate framework (ZIF-8) via pore-encapsulated solvent directed (PSD) approach. The composites maintain their structural integrity as well as photoluminescence (PL) properties upon dipping into a wide range of polar solvents including water (even in boiling conditions), prolonged exposure to UV irradiation and elevated temperature for longer period of time. Further on the basis of high stability, HBP@MOF composites have been demonstrated as heterogeneous photocatalyst to degrade toxic organic pollutants directly in water.
关键词： photocatalysis,porous coordination polymer,stability of hybrid perovskite,Hybrid bromide perovskite,nanocomposites,luminescence properties
更新于2025-09-19 17:15:36
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Efficient Wastewater Remediation Enabled by Self-Assembled Perovskite Oxide Heterostructures with Multiple Reaction Pathways
摘要： Advanced oxidation processes (AOPs) are promising for the removal of retardant organic pollutants in water. However, traditional free-radicals-dominated AOPs are often limited by poor tolerance to water characteristics. Recently, creating nonradical processes has been considered as an effective strategy to overcome this limitation, while the function and mechanism of nonradical processes are still unclear in the important oxides catalytic systems. Herein, the nonradical-dominated peroxymonosulfate (PMS)-based AOPs are triggered on a heterostructural perovskite nanocomposite catalyst (La0.4Sr1.05MnO4?δ), which is constructed from single and Ruddlesden?Popper perovskite phases by a facile self-assembled synthesis method. Noticeably, the phenol degradation rate of the heterostructural nanocomposite oxide is ～2 times that of its individual components. This activity enhancement can be attributed to the abundant active oxygen vacancies, strong affinity to the reactants, and high-electron-transfer efficiency in the unique heterointerface of the nanocomposite. Furthermore, a ternary mechanism is unveiled: contaminants are oxidized not only by the function of radicals and singlet oxygen evoked from the active sites of perovskites but also by the transfer of their electrons to PMS via the beneficial surface of a heterostructral catalyst. This study provides new insights into nonradical-based AOPs derived from hybrid metal oxides in a PMS system.
关键词： Nonradical-based AOPs,Peroxymonosulfate activation,Phenol degradation,Electron-transfer pathways,Perovskite nanocomposites
更新于2025-09-19 17:13:59
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Water Soluble and Bright Luminescent Cesium Lead Bromide Perovskite Quantum Dot-Polymer Composites for Tumor-Derived Exosomes Imaging
摘要： Cesium-lead-halide perovskite quantum dots (PQDs), are a highly promising class of next-generation optical material for bio-imaging applications. Herein, we present a nanocomposite strategy for the design of water soluble, highly luminescence CsPbBr3 PQD nanocomposites without modifying the crystal symmetry and photoluminescence (PL) property. Water soluble PQDs are reproducibly synthesized via encapsulating CsPbBr3 PQDs with polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (PS-PEB-PS) and poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol (PEG-PPG-PEG). In the reported design, the polystyrene triblock polymers strongly interact with the hydrophobic parts of PQDs and the water-soluble PEG moiety acts as protection layer to effectively prevent degradation of PQDs in water. Outer shell PEG layer also helps to develop biocompatible PQDs. Reported data indicate that encapsulating CsPbBr3 PQDs with polymer helps to improve the photoluminescence quantum yield (PLQY) from 83% to 88%, which may be due to decrease in the surface defects after the effective polymer coating. Experimental data show that PL intensity from CsPbBr3 PQD nanocomposites remain unchanged even after 30 days of exposure in air. Similarly, reported data indicate that nanocomposites retain their luminescence properties in water for first 8 days and then decreases slowly to 60% of its initial PL intensity after one month. On the other hand, the PL emission for the PQD without polymer encapsulation is completely quenched within few hours. Exosomes are highly promising avenue for accessing tumor type and stage and to monitor cancer treatment response. Reported data reveal that anti-CD63 antibody attached PQD nanocomposites are capable of tracking of triple negative MDA-MB-231 breast tumor derived exosomes via binding using anti- CD63 antibody and selective green luminescence imaging using PQD nanocomposites.
关键词： selective imaging of exosomes,Triple negative breast tumor derived exosomes,water soluble perovskite nanocomposites,Air stable CsPbBr3 quantum dots,Green luminescence imaging
更新于2025-09-11 14:15:04