石墨烯纳米杂化材料在酪氨酸手性识别及偶氮染料吸附中的研究

发布时间：2019-03-03 08:47

【摘要】：第一章:成功的合成氮乙酰-L-半胱氨酸(NALC-Au NPs),并将其用于电化学阻抗传感器的构建,实现了酪氨酸的手性识别。此传感器基于L-和D-酪氨酸与传感界面的作用不同,而导致电化学阻抗值产生差异,从而实现对酪氨酸手性识别。与其它方法相比,电化学阻抗传感器更加高效、准确,并且有宽的检测范围(10-769μmol·L-1)。另外,考察了NALC-Au NPs、酪氨酸的电沉积圈数、溶液p H、酪氨酸的浓度等对酪氨酸手性识别的影响。该方法将在医药领域中酪氨酸的手性识别方面有潜在的应用价值。第二章:成功合成了羧甲基-β-环糊精保护的石墨烯负载金纳米杂化材料(Au NPs-COOH-CH_3-β-CD-GNs),并将其修饰到玻碳电极表面,用于酪氨酸的手性识别。该材料结合了石墨烯、金纳米良好的导电性及环糊精手性识别的特性,对酪氨酸对映异构体有良好的手性识别效果。且当酪氨酸缓冲溶液p H为5.0、浓度为566μmol/L、Au NPs-COOH-CH_3-β-CD-GNs修饰量为6μL、孵化时间为5分钟时,Au NPs-COOH-CH_3-β-CD-GNs/GCE传感界面对酪氨酸的手性识别效果最佳。第三章:合成了β-环糊精功能化的石墨烯纳米材料(β-CD-GNs),考察了其作为一种新型高效吸附剂对水中酸性大红G(ASG)和橙黄Ⅱ(OrangeⅡ)的吸附性能。该材料结合了石墨烯和β-环糊精的特性,表现出对上述两种染料良好的吸附性能,吸附平衡时间小于3 min,吸附率达90%以上,β-CD-GNs对ASG和OrangeⅡ的最大吸附量为622.2 mg·L-1和534.7 mg·L-1。另外,考察了β-CD-GNs用量、溶液p H、反应温度对吸附效果的影响。结果表明,当溶液p H值为6.0、β-CD-GNs浓度为25 mg·L-1时,吸附率最大,而且吸附率随反应温度升高而降低。通过对吸附数据进行线性拟合发现,β-CD-GNs对ASG和OrangeⅡ的吸附等温线符合Langmuir吸附等温模型。该材料在印染废水的处理领域有潜在的应用价值。
[Abstract]:In chapter 1, N-acetyl-L-cysteine (NALC-Au NPs),) was successfully synthesized and applied to the construction of electrochemical impedance sensor (EIS) to realize the chiral recognition of tyrosine. Based on the difference of the interaction between L-and D-tyrosine and the sensing interface, the sensor results in the difference of electrochemical impedance, thus the chiral recognition of tyrosine can be realized. Compared with other methods, electrochemical impedance sensor is more efficient, accurate and has a wide detection range (10-769 渭 mol 路L-1). In addition, the effects of the number of electrodeposition cycles, the solution pH and the concentration of tyrosine on the chiral recognition of tyrosine in NALC-Au NPs, were investigated. This method will have potential application value in chiral recognition of tyrosine in medicine field. In chapter 2, carboxymethyl-尾-cyclodextrin protected graphene supported gold nano-hybrid material (Au NPs-COOH-CH_3- 尾-CD-GNs) was synthesized and modified to glassy carbon electrode surface for chiral recognition of tyrosine. The material combines graphene, gold nanoparticles with good conductivity and chiral recognition properties of cyclodextrin, and has a good chiral recognition effect on tyrosine enantiomers. And when the pH value of tyrosine buffer solution is 5.0, the concentration of au NPs-COOH-CH_3- 尾-CD-GNs is 566 渭 mol / L, and the incubation time is 5 minutes, the modification amount of au tyrosine 尾-mol / L is 6 渭 L, and the incubation time is 5 minutes. The chiral recognition effect of Au NPs-COOH-CH_3- 尾-CD-GNs/GCE sensing interface on tyrosine is the best. In chapter 3, 尾-cyclodextrin functionalized graphene nanomaterials (尾-CD-GNs) were synthesized and the adsorption properties of 尾-cyclodextrin functionalized graphene nano-materials for acidic red G (ASG) and orange 鈪，

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