Enzymeless voltammetric sensor for simultaneous determination of parathion and paraoxon based on Nd-based metal-organic framework

Rational design of a novel MOF-based ternary nanocomposite for effectively monitoring harmful organophosphates in foods and the environment

“…S7D and E † provide the resulting MP reduction peak current values when MP, with or without the interferences added, showing no obvious negative effects exceeding the selectivity limit of 10% of original values of MP, indicating good selectivity of the sensor. This may mainly come from the strong affinity between UiO-66-NH 2 and the phosphate group of MP, 19 and also some from the affinity between MWCNTs and MP through p-p interactions. 34 To conclude, the constructed sensor showed good reproducibility, excellent regeneration, acceptable stability, and satisfactory selectivity for the quantication of MP.…”

“…16,17 As a result, MOFbased binary nanocomposites have been developed for their potential in electrochemical sensing applications due to their superior synergizing properties beyond each component. [17][18][19] Multiwall carbon nanotubes (MWCNTs) are oen used as the conductive substrate to load or grow MOFs, [20][21][22] due to their good electrical conductivity and high surface area. 23,24 The electrochemical sensing performance of the MOF/MWCNTs composites is further boosted, and the dispersibility of MWCNTs was improved at the same time.…”

“…As previously reported, UiO-66-NH 2 /MWCNTs have many applications such as ultrafine dust capturing and SO 2 adsorption, 28 CO 2 photocatalytic reduction, 18 photodegradation of methyl orange and rhodamine B, 29 determination of lead, 30 cadmium ions, 31 dopamine, and acetaminophen. 32 Here, UiO-66-NH 2 and MWCNTs were rationally chosen as pristine materials to obtain binary nanocomposite UiO-66-NH 2 /MWCNTs by a one-pot method, not only considering their synergistic effects in the nanocomposite 21,33 but also that active Zr metal sites in UiO-66-NH 2 would provide specific affinity to the phosphate group of OPs, 19 as well as that MWCNTs would have a strong affinity to OPs through the π–π interaction. 34 Next, to further enhance the detection sensitivity of the binary MOF-based composite, in situ adoption of low-content platinum nanoparticles (PtNPs) on UiO-66-NH 2 /MWCNTs was first applied to construct the ternary nanocomposite.…”

“…18 For example, recently, a newly discovered Nd-UiO-66@MWCNT binary nanocomposite was used for the sensitive determination of parathion and paraoxon in tomatoes, spinach, cabbage, and tapwater samples. 19 A MB@MWCNTs/UiO-66-NH 2 composite was designed to build an electrochemical sensor for sensitive doxorubicin detection in human saliva. 25 However, the studies on more complex MOF-based ternary nanocomposites and their application in sensors are still limited.…”

A novel paraoxon imprinted electrochemical sensor based on MoS2NPs@MWCNTs and its application to tap water samples

“…There are a number of organophosphorus insecticides, one of which is paraoxon (PAR), exceedingly harmful to human health (Gallardo et al, 2006). With a half-life of around 5000 years, PAR is one of the most potent and toxic acetylcholinesterase insecticides and has various biological harmful side effects (Khoshsafar et al, 2022). Monitoring of even a trace amount of PAR in both environmental and human samples such as air, soil, water, urine, blood, etc.…”