Functionalized Cubic Mesoporous Silica as a Non‐Chemodosimetric Fluorescence Probe and Adsorbent for Selective Detection and Removal of Bisulfite Anions along with Toxic Metal Ions

Abstract

Dual signaling and remediation systems for detection and adsorption of toxic analytes have gained more attention over sensory probes only. However, most of the sensors for bisulfites are chemodosimetric probes, which are irreversible and having drawbacks of absolute selectivity, recyclability, and solubility in a pure aqueous system. To address above drawbacks a new non‐chemodosimetric probe material with a strong hydrogen bonding pocket for bisulfites is developed. Synthesis of cubic mesoporous silica by a modified Stober process followed by functionalization with 2,2′‐(((((3‐(triethoxysilyl)propyl)azanediyl)bis(methylene))bis(2,1‐phenylene))bis(oxy))bis(N‐(4‐((E)‐phenyldiazenyl)phenyl)acetamide) (AZOL) has given a fluorogenic silica probe material SiO2@AZOL. This material shows selectivity toward bisulfite anion (limit of detection (LOD): 64 ppb) and Hg2+, Cd2+, Cu2+, and Zn2+ cations (LOD: 126, 95, 14, and 27 ppb, respectively) among various analytes. The adsorption studies for these toxic analytes (HSO3 −, Hg2+, Cd2+, Cu2+, and Zn2+) show an extraction efficiency of around 99% and adsorption capacities of 873, 630, 633, 260, and 412 mg g−1, respectively. Spectroscopic studies along with adsorption, striping, and regeneration studies reveal that this material is a recyclable sensory cum adsorbent material for these toxic analytes. Moreover, this material can be used as a sensitive probe material for determination of HSO3 − levels in various sugar samples.

Design of Multifunctional Fluorescent Hybrid Materials Based on SiO2 Materials and Core–Shell Fe3O4@SiO2 Nanoparticles for Metal Ion Sensing

“…Copyright 2019, Wiley. E) Structure of cubic MSNs‐AZB‐3, relative emission intensity (λ em = 510 nm) with various metal ions (160 × 10 −6 m ), Reproduced with permission . Copyright 2018, Wiley.…”

“…Very recently, a nonchemodosimetric fluorescence hybrid probe (MSNs‐AZB‐3) was reported by Chatterjee et al for the selective detection and adsorption of toxic metal ions (Hg 2+ , Cd 2+ , Cu 2+ , and Zn 2+ ) and bisulfite anions in aqueous solutions (Figure E), which represents the first example of a nonchemodosimetric fluorescence hybrid material for selective bisulfite anions detection and adsorption. MSNs‐AZB‐3 showed an immediate fluorescence quenching response at 510 nm (λ em ) toward Hg 2+ , Cd 2+ , Cu 2+ , Zn 2+ , and HSO 3 − (160 × 10 −6 m ) with detection limits of 126, 95, 14, 27, and 64 ppb, respectively, in suspended aqueous solution (0.25 mg mL −1 ) at neutral pH (∼7).…”

A POSS‐Phosphazene Based Porous Material for Adsorption of Metal Ions from Water

“…In the past, extensive studies have been reported to unravel the scopeo fs uch functional materials as activated porous carbon, [5] zeolites, [6] silica particles, [7][8][9][10][11][12][13] graphene oxide, [14,15] metals or metal oxides, [16,17] natural minerals [18][19][20] etc. as adsorbents for remediationo fm etal ions from water.T he search for new and efficient adsorbentsh as prompted the design and synthesis of functional polymers, [21][22][23][24][25][26][27] metal organic frameworks, [28][29][30] polymeric composites [31][32][33] and biohybrids.…”

Ratiometric fluorescent detection of Cu2+ based on dual‐emission ZIF‐8@rhodamine‐B nanocomposites

“…Some conventional analysis methods have been applied to the determination and quantification of Cu 2+ , including inductively coupled plasma, anodic stripping voltammetry, chromatography, electrochemical and atomic absorption spectrometry . These methods can accurately determine the concentration of trace Cu 2+ , but they also have some obvious shortcomings such as time‐consuming, high‐cost, complicated operation, and so on . Recently, the selective detection of trace Cu 2+ through fluorescence techniques has aroused great interest in many areas .…”