首页|Peroxidase-like activity of bimetal Cu-Zn oxide mesoporous nanospheres for the determination of o-aminophenol
Peroxidase-like activity of bimetal Cu-Zn oxide mesoporous nanospheres for the determination of o-aminophenol
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NSTL
To enhance the peroxidase-like performance and its application in detection of toxic o-aminophenol(o-AP),a kind of bimetal Cu-Zn oxide-based mesoporous nanosphere(Cu_(2/3)Zn_(1/3)O PNPs) was constructed under microwave-radiation conditions.Its mesoporous microstructure and peroxidase-like catalytic activity were investigated in detail.The results showed that Cu_(2/3)Zn_(1/3)O PNPs possessed a high specific surface area of 34.89 m~2g~(-1) and a well-distributed mesoporous size of approximate 6.07 nm,which endowed the superior peroxidase-like performance.The material catalyzes the oxidization of 3,3',5,5'-tetramethylbenzidine(TMB) with Km/V_(max) of 0.104 mM/3.79 × 10~(-8)M·s~(-1) in the presence of H2O2.Especially o-AP could exclusively deteriorate the characteristic UV-Vis absorbance intensity at 653 nm(A_(653)) of the Cu_(2/3)Zn_(1/3)O PNPs-TMB-H2O2 system with obvious color change from blue to colorless.Under the optimal conditions,the effect of some interfering substances was low and the limit of detection(LOD) for o-AP was 1.65 × 10~(-8) mol/L(S/N = 3).When applied to the colorimetric detection of o-AP in practice,the recovery was between 96.1 and 107.2% with R.S.D.less than 2.04%.The mechanism of synergic-enhancement peroxidase-mimic activity of Cu_(2/3)Zn_(1/3)O PNPs and its exclusive colorimetric response to o-AP were proposed as well.
NSTL
