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在水热条件下,以铝盐为原料,利用PEG 2000为模板剂合成η-Al2O3(PEG)介孔纤维,通过透射电子显微镜(TEM)对介孔材料进行表征。以介孔η-Al2O3为修饰剂,制备介孔η-Al2O3修饰玻碳电极。采用伏安法研究了缓冲溶液、修饰剂用量等响应条件对2,5-二甲基苯酚电化学行为的影响。实验结果表明以p H 3.60 HAc-Na Ac缓冲溶液为支持电解质,修饰剂量为10μL,扫描速度为0.1 V/s,富集时间为4 s,在2.0×10-5~7.0×10-4mol/L的范围内,峰电流与2,5-二甲基苯酚浓度呈良好线性关系。峰电流与扫速的平方根成线性关系,说明2,5-二甲基苯酚在修饰电极上的反应过程是受扩散控制。所提出的新方法用于模拟废水中2,5-二甲基苯酚的测定,回收率在98.2%~103.8%,说明建立的新方法准确、可靠。
The η-Al2O3 (PEG) mesoporous fibers were synthesized by using aluminum salt as raw material and PEG2000 as template under hydrothermal conditions. The mesoporous materials were characterized by transmission electron microscopy (TEM). Mesoporous η-Al2O3 modified glassy carbon electrode was prepared with mesoporous η-Al2O3 as modifier. The voltammetric method was used to study the influence of buffer solution, modifier dosage and other response conditions on the electrochemical behavior of 2,5-dimethylphenol. The experimental results show that the p H 3.60 HAc-Na Ac buffer solution is used as the supporting electrolyte, the modification dose is 10 μL, the scanning speed is 0.1 V / s, the enrichment time is 4 s, and the concentration is 2.0 × 10 -5 -7.0 × 10 -4 mol / L range, the peak current and 2,5-dimethylphenol concentration showed a good linear relationship. The peak current is linear with the square root of the sweep rate, indicating that the reaction of 2,5-dimethylphenol on the modified electrode is controlled by diffusion. The proposed new method was applied to the determination of 2,5-dimethylphenol in wastewater. The recovery rate was between 98.2% and 103.8%, indicating that the new method was accurate and reliable.