Gd(III)-Doped Boehmite Nanoparticle: An Emergent Material for the Fluorescent Sensing of Cr(VI) in Wastewater and Live Cells

Abstract

This article reports the effect of Gd­(III) doping on the structure, microstructure, and optical properties of boehmite nanoparticles. The bright-blue fluorescence along with a long lifetime makes our material an efficient candidate for optical applications. Our material particularly targets and eliminates hexavalent chromium ions (Cr­(VI)) from aqueous media, which turns it into a multifunctional fluorescent nanosensor (MFNS). The development of an efficient hexavalent chromium ion (Cr­(VI)) sensor to detect and quantify Cr­(VI) ions is still a serious issue worldwide. Thus, this work will be very beneficial for various environmental applications. No such work has been reported so far which includes cost-effective and biocompatible boehmite nanoparticles in this field. Detailed synthesis and characterization procedures for the MFNS have been incorporated here. The biocompatibility of the MFNS has also been studied rigorously by performing cell survivability assay (MTT) and cellular morphology assessments. Our extensive research confirmed that the “turn-off” sensing mechanism of this sensor material is based on a collisional quenching model which initiates the photoinduced electron transfer (PET) process. High selectivity and sensitivity (∼1.05 × 10–5 M) of the MFNS toward hexavalent chromium ions even in real life wastewater samples have been confirmed, which makes this fluorescent probe a potential candidate for new age imaging and sensing technologies.

Cu(II) and Gd(III) doped boehmite nanostructures: a comparative study of electrical property and thermal stability

“…Rare earth gadolinium doped GBH particles appeared to be rod-like. Previously, we have mentioned in our article [38] that increasing microstrain changes the particle morphology significantly by virtue of crystal defects which contribute toward this morphological evolution [41]. Here, in the case of CBH, the ionic radius of copper ions is quite smaller than that of gadolinium ions.…”

“…Biocompatibility is another major advantage of selecting boehmite for any application [36]. Boehmite was reported as a promising dental and orthopedic material due to its biocompatibility and bioavailability [37,38]. Nonetheless, a very limited amount of interest has been paid on hybrid or doped boehmite nanostructure.…”

InSitu-Grown Cdot-Wrapped Boehmite Nanoparticles for Cr(VI) Sensing in Wastewater and a Theoretical Probe for Chromium-Induced Carcinogen Detection

“…In order to estimate the sensitivity of the probe, various concentrations of Cr­(VI) (0–25 μM) were added to 500 μM solution of CDBH, and the responses are depicted in Figure . It shows a gradual decrement of fluorescence intensity of the sensor material upon Cr­(VI) addition, which has been fitted using the linear SV equation (Figure ) where I 0 and I are the fluorescence intensities before and after the addition of Cr­(VI), respectively, [ M ] is the concentration of the ions, and K SV is the SV quenching constant. The SV plot is taken up to 5 μM concentration of Cr­(VI) to ensure the linearity of the plot, showing a fitting coefficient ( R 2 ) of 0.99993.…”

“…Beyond this value, the graph shows an upward increment (Figure S3), which might be due to the inner filter effect (IFE). 55 The limit of detection (LOD) of the sensing probe is estimated using the following formula (eq 6) 54 K LOD 3 / SV σ = (6) where σ and K SV are the standard deviation of at least 10 measurements of the fluorescence intensities of pure CDBH without the presence of any quencher and the quenching constant, respectively. The LOD of the probe is found to be 58.1 nM, which is lesser than most of the previous reports mentioned in Table S1.…”

NH3-Sensing Mechanism Using Surface Acoustic Wave Sensor with AlO(OH) Film

“…However, to the best of our knowledge, few papers have been focused on ammonia sensing using the sol-gel AlO(OH) film [30,31]. Therefore, in this paper, for the first time, we will investigate the NH 3 sensing properties and mechanisms of a quartz SAW sensor coated with AlO(OH) sensing layer.…”