A solid solution of aero-gel based cerium doped iron oxide nanoparticles has been utilized for the first time for ultrasonic wave assisted adsorptive removal of arsenic from aqueous medium. The FE-SEM and HR-TEM images revealed a novel morphology of hollow architectures with irregular distribution in sizes in which the particles are interconnected with each other in a long-range network. The HR-XRD analysis indicated the cubic fluorite type structure with Fm3̅ m space group which is retained even after adsorption of As(III). The Raman study and Lebail refinement confirmed the formation of solid solution of Fe and Ce oxide nanoparticles. The room temperature ferromagnetism was observed for CeO 2 NPs (Ms 0.0209 emu g −1 ) which is attributed to higher concentration of oxygen vacancies and increased (Ms 0.0287 emu g −1 ) after doping of iron. The adsorption pattern of As(III) is well-defined by Redlich−Peterson isotherm while the adsorption is governed by pseudo-second-order kinetics. The HR-XPS and diffuse reflectance spectroscopy revealed the formation of variable oxidation state of metal ions which facilitate the oxidation of As(III) (more toxic) to As(V) (less toxic) during adsorption process. The effective removal of arsenic (more than 80%) was observed within 2.5 min of initial adsorption process and approximately 99% removal was achieved within 10 min of adsorption. The adsorption capacity of our best adsorbent was found to be 263 mg g −1 . The effect of pH and interfering ions on adsorption capacities of synthesized adsorbents revealed its efficacy over the wide range of pH.

A single colorimetric chemosensor for the detection of both Cu2+ and AMP2− ions has been developed for the first time.

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A new isatin‐triazole tethered rhodamine based fluorescent probe R1 (1‐(2’’‐(4’‐(((3’’’,6’’’‐bis(diethylamino)‐3’’‐oxospiro[isoindoline‐1’’,9’’’‐xanthen]‐2’’‐yl)amino)methyl)‐1H‐1’,2’,3’‐triazolyl)ethyl)indoline‐2,3‐dione) has been synthesized using click chemistry approach. Probe R1 exhibits a dual sensor property for Cu2+ and Fe3+ ions through turn‐on fluorescence response. A prominent colour change from colourless to pink allows the naked eye identification of aforementioned metal ions. R1 forms a 1:2 complex with Cu2+ and Fe3+ ions with binding constants 8.0 × 108 and 2.93 × 107 M−2, respectively. The binding mode is scrutinised through various spectroscopic techniques which is further supported by theoretical calculations. The detection limit of R1 for Cu2+ and Fe3+ ions is found to be 12.2 nM and 0.33 μM, respectively. Further, R1 has been evaluated for its potential to detect Cu2+ ions in biological systems using fluorescence cell imaging studies.