A facile strategy for the preparation of ZnS nanoparticles deposited on montmorillonite and their higher catalytic activity for rapidly colorimetric detection of H2O2.
In this paper, ZnS nanoparticles deposited on montmorillonite (ZnS-MMT) were prepared by a facile method at room temperature and characterized by powder X-ray diffraction (XRD), Energy-dispersive X-ray Detector (EDX) and transmission electron microscope (TEM), respectively. Significantly, the as-prepared ZnS-MMT nanocomposites have been proven to possess intrinsic peroxidase-like activity that can rapidly catalyze the reaction of peroxidase substrate 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H2O2 and produce a blue color product in less than 30 seconds, which provides a sensitive colorimetric sensor to detect H2O2. Due to the synergistic effects between montmorillonite and ZnS nanoparticles, the obtained ZnS-MMT nanocomposites exhibit higher catalytic activity than that of MMT or ZnS alone. The catalytic behaviors of the ZnS-MMT nanocomposites showed a typical Michaelis-Menten kinetics. The catalytic activity and the catalytic mechanism were investigated using the procedures of steady-state kinetics and hydroxyl radical detection. ESR data revealed that the peroxidase-like activity of ZnS-MMT originated from the generation of OH radicals.
College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
Yanyuan
Y
Ding
College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
Lifang
L
Sun
College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
Yanling
Y
Jiang
College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
Shunxiang
S
Liu
College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
Mingxing
M
Chen
College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
Miaomiao
M
Chen
College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China.
Yanan
Y
Ding
College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China. Electronic address: qyliu@sdust.edu.cn.
Qingyun
Q
Liu
D001546:Bentonite / Q000737:chemistry*; D002138:Calibration; D002384:Catalysis; D003124:Colorimetry / Q000379:methods*; D006861:Hydrogen Peroxide / Q000032:analysis; D007700:Kinetics; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009195:Peroxidase / Q000378:metabolism; D013052:Spectrometry, X-Ray Emission; D013440:Sulfides / Q000737:chemistry*; D013997:Time Factors; D014961:X-Ray Diffraction; D017967:Zinc Compounds / Q000737:chemistry*
D013440:Sulfides; D017967:Zinc Compounds; D001546:Bentonite; D006861:Hydrogen Peroxide; D009195:Peroxidase; C031238:zinc sulfide
Catalytic; Colorimetric; H(2)O(2); Montmorillonite; Nanocomposite; ZnS