| Phenol is an important environmental pollutant, which is greatly harmful to ourbody and has been listed in the blacklist of important environmental pollutants by manyorganizations and institutions at home and abroad. Therefore Real-time detection andcontrol of phenol are very important. electrochemical sensor has the advantage oflightweight, low cost, simplicity of operation, high sensitivity, fast response, real-timedetection, etc. Therefore it is a hotspot area in the field of electroanalysis.Ni/MWCNT and FeNi/MWCNT composite was prepared through electroless plating.The morphology observations showed that the average size of Ni and FeNi magneticnanoparticle was12nm and20nm respectively. And then they were used to modifyglassy carbon electrode（GCE） and construct electrochemical sensor for phenol. Underthe optimal conditions, the oxidation peak current of phenol on the Ni/MWCNTmodified electrode was proportional to the concentration of phenol over the range of1.0×10-5～4.8×10-4mol/L with the detection limit of7.07×10-6mol/L（R=0.9970）,Anti-interference was bad for alcohol; the oxidation peak current of phenol on theFeNi/MWCNT modified electrode was proportional to the concentration of phenol overthe range of3.0×10-62.48×10-4mol/L with the detection limit of2.70×10-6mol/L（R=0.9992）, Anti-interference was good for alcohol. So FeNi/MWCNThad the lower detection limit and strong anti-interference than Ni/MWCNT.Fe3O4/MWCNT, NiO/MWCNT and Fe3O4/NiO/MWCNT composite were preparedby eletroless plating and pyrolysis. The average size of Fe3O4and NiO nanoparticle was8nm and25nm respectively among the composites. And then they were used to modifyglassy carbon electrode（GCE） and construct electrochemical sensor for phenol. Underthe optimal conditions, the oxidation peak current of phenol on the Fe3O4/MWCNTmodified electrode was proportional to the concentration of phenol over the range of5.0×10-62.35×10-4mol/L with the detection limit of4.83×10-6mol/L （R=0.9990）,Anti-interference was good for alcohol; the oxidation peak current of phenol on theNiO/MWCNT modified electrode was proportional to the concentration of phenol overthe range of1.0×10-51.0×10-4mol/L with the detection limit of5.96×10-6mol/L（R=0.9982）, Anti-interference was bad for alcohol; Fe3O4/NiO/MWCNT modifiedelectrode was proportional to the concentration of phenol over the range of 1.5×10-55.5×10-5mol/L with the detection limit of3.75×10-7mol/L （R=0.9957）,Anti-interference was good for alcohol. The result indicated that detection limit of theoxide composite was better than that of the metal composite and ternary compositeFe3O4/NiO/MWCNT had the lowest detection limit and strong anti-interference. |
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