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%.
引用
收藏
页码:534 / 541
页数:8
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