Facile Synthesis of Ordered Mesoporous Zirconia for Electrochemical Enrichment and Detection of Organophosphorus Pesticides

Abstract

Highly crystallized mesoporous ZrO2 nanomaterials were synthesized by solvent evaporation induced self‐assembly approach. Ordered mesoporous ZrO2 nanomaterials were characterized by TEM, SEM, BET, XRD and UV‐Vis spectroscopy. The obtained nanomaterials exhibit the close‐packing mesopores with average pore size of 7 nm and a highly crystallized framework with tetragonal phase. A non‐enzyme electrochemical sensor based on ordered mesoporous ZrO2 is established for selective detection of methyl parathion (MP). The online extraction of MP is firstly achieved by ZrO2 modified electrode at open‐circuit potential for 5 min., and the sensitive detection of MP is performed by differential pulse voltammetry (DPV) method. By comparison, DPV responses of mesoporous ZrO2 are 40 times and 25 times larger than that of mesoporous silica and mesoporous carbon with the similar pore structure, implying the specific affinity advantage of zirconia to phosphoric group. The quantitative analysis result shows that the voltammetric currents are linear with concentrations of MP ranging from 1 ng/ml to 2 μg/ml with a detection limit of 0.53 ng/ml. The sensor also exhibits good stability and high selectivity against interfering species. The excellent analytical performances are owed to the accessible and uniform mesoporous structures, highly crystallized frameworks of ZrO2 and its specific affinity to phosphate groups.

Highly Efficient Transfer Hydrogenation of Biomass-Derived Furfural to Furfuryl Alcohol over Mesoporous Zr-Containing Hybrids with 5-Sulfosalicylic Acid as a Ligand

“…After the addition of the 5-sulfosalicylic acid solution (pH ≈ 1.3), both the hydrolysis of zirconium alkoxide and the subsequent condensation process sped up under the acidic condition [ 34 ]. Meanwhile, the hydrolyzed hydrophilic inorganic zirconium species interacted with the F127 micelles via hydrogen bonding and weak coordination bonds [ 35 ] and were coordinated with the 5-sulfosalicylic acid molecules. Finally, the gelatinous precipitate was formed as the hybrid precursor.…”

Mesoporous Materials–Based Electrochemical Biosensors from Enzymatic to Nonenzymatic

“…This work provided a new strategy to fabricate the nonenzymatic biosensors by using the intrinsic property of metal oxide toward certain organic groups. [ 55 ] Interestingly, Zhang et al synthesized porous Co 3 O 4 hollow nanododecahedra by a facile thermal transformation of metal–organic framework (ZIF‐67) and further used for nonenzymatic glucose biosensor and biofuel cell. This work introduced a new strategy to synthesize the porous metal oxide nonenzymatic biosensor by using the porous MOFs as the precursor.…”

Stripping Voltammetric Determination of Methyl Parathion at Activated Carbon Nanopowder Modified Electrode

“…Therefore, they emerged as a promising alternative to the time‐consuming and expensive off‐site chromatographic techniques currently used [5–7]. Some typical examples include the electrochemical quantification of nitrophenyl substituted OPs, selecting methyl parathion as a model [8–25],…”

“…Among the electrochemical methods for methyl parathion determination, stripping voltammetry combined with solid‐phase extraction applied for the analyte preconcentration at the electrode surface has drawn increasing attention, due to the improved sensitivity and low detection limit achieved. In this sense, excellent features revealed the electrodes modified with materials with high adsorption capacity and affinity to phosphate groups, such as the nanostructured metal oxides (ZrO 2 , CeO 2 , TiO 2 ), the carbonaceous nanomaterials (carbon nanotubes, graphene, carbon dots), and the hybrid nanocomposites they form [16–25]. However, some of the metal oxides (TiO 2 and ZrO 2 in particular) readily lose their surface area when used as a high surface area catalyst [26], while the quoted carbon‐based nanomaterials are still too expensive and their production involves complicated fabrication protocols.…”