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Facile Synthesis of Ordered Mesoporous Zirconia for Electrochemical Enrichment and Detection of Organophosphorus Pesticides
Author(s) -
Huo Shijie,
Zhao Hongbin,
Dong Junping,
Xu Jiaqiang
Publication year - 2018
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201800284
Subject(s) - mesoporous material , detection limit , nanomaterials , materials science , cubic zirconia , mesoporous silica , cyclic voltammetry , differential pulse voltammetry , selectivity , chemical engineering , mesoporous organosilica , electrochemical gas sensor , electrochemistry , electrode , nanotechnology , chemistry , chromatography , organic chemistry , catalysis , ceramic , engineering , composite material
Highly crystallized mesoporous ZrO 2 nanomaterials were synthesized by solvent evaporation induced self‐assembly approach. Ordered mesoporous ZrO 2 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 ZrO 2 is established for selective detection of methyl parathion (MP). The online extraction of MP is firstly achieved by ZrO 2 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 ZrO 2 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 ZrO 2 and its specific affinity to phosphate groups.