Graphene oxide modified H₄L‐ion imprinting electrochemical sensor for the detection of uranyl ions

Abstract

The rapid development of the nuclear industry has gradually aroused people′s attention to the problem of nuclear pollution. Due to the biological toxicity of uranium and its aqueous solution, simple and rapid detection of uranium in the water environment is quite important. An ion imprinted carbon nanomaterial (graphene oxide) electrochemical sensor for the detection of trace uranyl ions was prepared by using the synthesized bipolar tetradentate macrocyclic uranyl ligand cyclo‐bis‐phenylenediamine‐bis‐(phenylmethyl‐diphyrrolecarbaldehyde) (H4L) as functional monomer. The sol‐gel polymer was prepared by hydrolysis and polymerization of H4L ligand, 3‐aminopropyltrimethoxysilane and tetraethoxysilane. H4L‐ion imprinted polymer (U‐IIP) was prepared by adding 1 mM uranyl ion as template ions. Then the polymer was bonded to graphene oxide modified carbon paste electrode, and the template ions were eluted to obtain H4L‐ion imprinted‐graphene oxide modified carbon paste electrode (U‐IIP/GO/CPE). Differential pulse voltammetry was used to detect trace uranyl ions. The results showed that the U‐IIP/GO/CPE sensor system can detect uranyl ions with high sensitivity and specificity, and the peak current appeared around −0.26v. In the range of 0.01 μM∼3.0 μM, the detection current had a good linear relationship with the molar concentration of uranyl ions, and the method detection limit was 1.32 nM (S/N=3). Through the detection of actual samples, it had a good acceptable recovery rate (95.45 %∼106.25 %), and the relative standard deviation was less than 3.25 %.

Smartphone-assisted colorimetric determination of uranyl ions in aqueous solutions

“…Much effort has been taken for the construction of novel sensing platforms. [17][18][19][20][21][22] To date, there are various reliable and sensitive strategies aimed at detecting trace amounts of UO 2 2+ in the environment, such as atomic absorption spectrometry, 23 electrochemistry, 24,25 inductively coupled plasma-atomic emission spectrometry [26][27][28] and X-ray fluorescence. 29 The sophisticated instrumentation and detection procedures of these approaches, however, restrict their future applications, 30 as it is challenging to provide prompt results in a field setting.…”

Electrochemical sensor based on amine- and thiol-modified multi-walled carbon nanotubes for sensitive and selective determination of uranyl ions in real water samples

“…Synthetic efforts have been exerted by scholars to develop the sensitivity and selectivity of the working electrode surface. Signicant improvements in electrode sensing have been reported using conducting polymers, 11,12 metal nanoparticles, 13,14 Ni/NiO partially oxidized carbon nanomaterials, 15 graphene oxide, 11,16 and multi-walled carbon nanotubes (MWCNT). 17 Among these, MWCNT, a rising star on the horizon of materials science, are excellent candidates for sensor fabrication because of their unique physiochemical properties, large surface area, high electrical conductivity, and fast electron transfer kinetics.…”