共 49 条
Synthesis of α- and β-CoNi binary hydroxides nanostructures and luminol chemiluminescence study for H2O2 detection
被引:16
作者:
Pourfaraj, Reza
[1
]
Kazemi, Sayed Yahya
[2
]
Fatemi, Seyed Jamilaldin
[1
]
Biparva, Pourya
[2
]
机构:
[1] Shahid Bahonar Univ Kerman, Dept Chem, Kerman 76169133, Iran
[2] Sari Agr Sci & Nat Resources Univ, Dept Basic Sci, Sari, Iran
关键词:
alpha- and beta-CoNi hydroxides;
Chemiluminescence;
H2O2;
River water;
LAYERED DOUBLE HYDROXIDES;
HYDROGEN-PEROXIDE DETECTION;
NICKEL-HYDROXIDE;
CO3O4;
NANOPARTICLES;
COBALT-HYDROXIDE;
AQUEOUS-SOLUTION;
SYSTEM;
CATALYST;
PHASES;
BETA-NI(OH)(2);
D O I:
10.1016/j.jphotochem.2018.06.045
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Herein, we firstly reported utilization of alpha- and beta-CoNi hydroxides nanostructures as efficient catalyst for the luminol-H2O2 CL reaction. The catalysts were synthesized by hydrothermal method and characterized by XRD, FT-IR, FE-SEM/EDX, and UV-vis. The alpha-form had layered double hydroxide (LDH) structure witout trivalent cations in the metal hydroxide layer, while the structure of beta-phase was similar to brucite. UV-vis spectra demonstrated that the partial oxidation of Co2+ and Ni2+ did not occur in the both catalysts. It was found that a and beta-CoNi could significantly enhance CL reaction of luminol-H2O2 at pH = 11. During study of experimental parameters the higher relative intensity of CL signal in the presence of alpha-Co-Ni hydroxide was observed. This may be due to the greater Co2+/Ni2+ ratio in this catalyst than beta-phase. Therefore, a facile and rapid method was developed to assay H2O2 using alpha-CoNi binary hydroxide as catalyst. Under optimum conditions, in the range 0.1-12 mu M of H2O2 concentrations the CL intensity was linear and a detection limit (S/N = 3) of 0.05 mu M for H2O2 was obtained. The relative standard deviation for 6 repetitive determinations was less than 2.9%. The proposed method was successfully applied to detect H2O2 in river water samples with recoveries of 97.3% and 106%.
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页码:534 / 541
页数:8
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