摘要
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。
Using Al（ NO3）3·9H2O and CO（ NH2）2as precursors,polyethylene glycol 2000（ PEG,molecular mass = 2000） as templates,the mesoporous η-Al2O3 fibers with the ordered mesostructure were synthesized bya hydrothermal method. The mesoporous η-Al2O3 fiber was characterized by transmission electron microscopy（ TEM）. Mesoporous η-Al2O3 as modifier,η-Al2O3 coated glassy carbon electrode（ η-Al2O3/ GCE） was fabricated. The effect of buffer solution,the amount of modifier and the other conditions on the electrochemical response of 2,5-dimethyl phenol were discussed systematically by voltammetry. The optimum experiment conditions were as follows,p H 3. 6 acetic acid and sodium acetate buffer solution as the supporting electrolyte,10 μL modifier,scanning speed of 0. 1 V / s,4 s accumulation time. Under the optimum conditions,the peak current increases linearly with the concentration of 2,5-dimethyl phenol in the range of 2. 0 × 10- 5~ 7. 0 × 10- 4mol / L. The oxidation peak current increases proportionally with the square root of the scan rate,indicating that the reaction of 2,5-two methyl phenol at the modified electrode is diffusion-controlled process. This new method was used to determine 2,5-dimethyl phenolin the simulated waste water,and the recoveries are from 98. 2% to 103. 8%,indicating that the proposed method is accurate and reliable.
出处
《化学试剂》
CAS
北大核心
2015年第2期113-116,共4页
Chemical Reagents
基金
国家自然科学基金资助项目(21203087)
河南省基础与前沿技术研究计划基金资助项目(122300410031)
河南省高等学校青年骨干教师资助计划基金资助项目(2009GGJS-123)
