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利用纳米钯/β-环糊精复合物修饰镍钢电极(Pd/β-CD/TCh/Ni-Fe)制备了2,6-二氯苯酚(2,6-DCP)传感器。修饰电极的制备通过三个步骤:采用电化学方法将带正电的硫胆碱共价修饰到镍钢表面(TCh/Ni-Fe);将β-环糊精(β-CD)通过静电吸附自组装在TCh/Ni-Fe表面(β-CD/TCh/Ni-Fe);通过双电位阶跃法,将纳米钯沉积在β-CD/TCh/Ni-Fe表面。采用场发射扫描电镜、X-晶体衍射、X-射线光电子能谱及电化学技术表征了该修饰电极的特性。结果显示:纳米钯呈麦穗状,均匀地沉积在电极表面,粒径为17.2±4nm。Pd/β-CD/TCh/Ni-Fe电极对2,6-DCP的氧化还原有较强的电催化作用,在1×10-6～1×10-4 mol·L-1的浓度范围内,2,6-DCP的氧化峰电流与其浓度呈良好的线性增长关系[i(A)=2.8×10-3+11.9 Cx(mol·L-1),R=0.996,检测限:1×10-9 mol·L-1(3σ)]。
The 2,6-dichlorophenol (2,6-DCP) sensor was prepared by using Pd / β-CD / TCh / Ni-Fe nano- The modified electrode was prepared by three steps: electrochemically covalent modification of the positively charged thiocholine onto the surface of the nickel steel (TCh / Ni-Fe); the β-cyclodextrin (β-CD) Self-assembled on the surface of TCh / Ni-Fe (β-CD / TCh / Ni-Fe); nano-palladium was deposited on the surface of β-CD / TCh / Ni-Fe by bipotential step method. The characteristics of the modified electrode were characterized by field emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and electrochemical techniques. The results showed that nano-palladium was spike-like and uniformly deposited on the surface of the electrode with particle size of 17.2 ± 4nm. The Pd / β-CD / TCh / Ni-Fe electrode has a strong electrocatalytic effect on the redox of 2,6-DCP. Under the concentration range of 1 × 10-6 ~ 1 × 10-4 mol·L-1, , The oxidation peak current of 2,6-DCP showed a good linear relationship with the concentration [i (A) = 2.8 × 10-3 + 11.9 Cx (mol·L-1), R = 0.996, detection limit: 1 × 10 -9 mol·L-1 (3σ)].