A Flower-like In2O3 Catalyst Derived via Metal–Organic Frameworks for Photocatalytic Applications

The most pressing concerns in environmental remediation are the design and development of catalysts with benign, low-cost, and efficient photocatalytic activity. The present study effectively generated a flower-like indium oxide (In2O3-MF) catalyst employing a convenient MOF-based solvothermal self-assembly technique. The In2O3-MF photocatalyst exhibits a flower-like structure, according to morphology and structural analysis. The enhanced photocatalytic activity of the In2O3-MF catalyst for 4-nitrophenol (4-NP) and methylene blue (MB) is likely due to its unique 3D structure, which includes a large surface area (486.95 m2 g−1), a wide spectrum response, and the prevention of electron–hole recombination compared to In2O3-MR (indium oxide-micro rod) and In2O3-MD (indium oxide-micro disc). In the presence of NaBH4 and visible light, the catalytic performances of the In2O3-MF, In2O3-MR, and In2O3-MD catalysts for the reduction of 4-NP and MB degradation were investigated. Using In2O3-MF as a catalyst, we were able to achieve a 99.32 percent reduction of 4-NP in 20 min and 99.2 percent degradation of MB in 3 min. Interestingly, the conversion rates of catalytic 4-NP and MB were still larger than 95 and 96 percent after five consecutive cycles of catalytic tests, suggesting that the In2O3-MF catalyst has outstanding catalytic performance and a high reutilization rate

Rhodamine based “turn–on” molecular switch FRET–sensor for cadmium and sulfide ions and live cell imaging study

A novel fluorescent chemosensor based on a rhodamine derivative (RBD4) was designed, synthesized, and used as a selective Cd2+ ion sensor. The structure of the fluorescence sensor (RBD4) is confirmed through single crystal X-ray study. On the basis of the Förster resonance energy transfer mechanism between rhodamine and pyridine conjugated dyad, a new colorimetric as well as fluorescence probe was synthesized for the selective detection of Cd2+. This sensor shows high selectivity towards Cd2+ ions in the presence of other competing metal ions. On the basis of thorough experimental and theoretical findings, the additions of Cd2+ ions to the solution of RBD4 helps to generate a new fluorescence peak at 590nm due to the selective binding of Cd2+ ions with RBD4 in a 1: 1 ratio with a binding constant (K) of 4.2524×104M−1. The detection limit of RBD4 for Cd2+ was 1.025×10−8M, which presented a pronounced sensitivity towards Cd2+. The in situ generated RBD4–Cd2+ complex is able to selectively sense S2− over other anions based on the displacement approach, given a remarkable recovery of fluorescence and UV–vis absorption spectra. The fluorescence sensor has also exhibited very good results in HeLa Cells imaging under physiological pH

Synthesis of rhodamine based organic nanorods for efficient chemosensor probe for Al (III) ions and its biological applications

A novel highly selective rhodamine based organic nanorods (ONRs) was successfully designed and synthesised, which showed both absorption and fluorescence turn-on responses for Al3+ ions in aqueous solution. The ONRs possess strong fluorescence emission in aqueous solution. These spectral changes are sufficient to detection of Al3+ ions in the visible region of the spectrum and thus support naked eye detection. The aforesaid studies reveal that ONRs−Al3+ complex is highly selective and fully reversible in presence of sulphide anions. This study raises the new possibility of a highly selective and sensitive ONRs having multifunctional detection, including cation and anions, using a successive fluorescence response strategy in biological systems. Besides, the fluorescence microscopic studies confirmed that the fluorescent probe ONRs could be used as an imaging probe for detection of uptake of Al3+ ions in HeLa cells