共查询到20条相似文献，搜索用时 203 毫秒
1.
固定化辣根过氧化物酶电化学测定有机过氧化物和亚硝酸盐 总被引：1，自引：0，他引：1
利用海藻酸钠（SA）水凝胶将辣根过氧化物酶（HRP）固定在玻碳电极表面,制备了HRP-SA膜修饰电极．包埋在海藻酸钠水凝胶中的辣根过氧化物酶可以与电极直接传递电子．在pH=7．0的磷酸盐缓冲溶液和磷酸盐,乙醇混合溶液中均可得到一对辣根过氧化物酶辅基血红素Fe（Ⅲ）／Fe（Ⅱ）电对的可逆氧化还原峰．研究了HRP-SA膜修饰电极对有机过氧化物（过氧化氢、氢过氧化叔丁基、氢过氧化异丙基苯、过氧化丁酮）和亚硝酸盐的电催化性质,表明该方法可用于上述物质的定量测定． 相似文献
2.
在pH：2．0的B—R（Britton—Robinson）的缓冲溶液中,对制备的多壁碳纳米管,双十六烷基磷酸（MwcNT—D船）膜修饰电极进行了循环伏安法（CV）表征;分别研究了涕必灵（1BZ）在裸玻碳电极（GcE）和MWCNT—DHP膜修饰电极上的电化学行为,采用微分脉冲伏安法（DTV）,以MWCNT—DHP膜修饰电极为工作电极,建立了一个简单、快速、灵敏的涕必灵电化学分析检测体系;并结合固相萃取技术,测定了环境水中涕必灵含量,检测限达到2．0×10-8mol·L-1,平均回收率为97．28％-99．40％,RSD为1．3％～2．8％（n=6）。 相似文献
3.
以钼磷杂多酸作为光催化还原剂制备了表面负载钼磷杂多酸的纳米金溶胶（PMo12-NGs）,并将此PMo12-NGs修饰到具PVP膜的玻碳电极表面,考察该修饰电极的电化学行为．实验结果表明,用光催化还原法可直接制备得到杂多酸负载量大且均匀性好的纳米金,由此制备的纳米金修饰电极具有PMo12的良好的电化学行为,且电化学响应和电极稳定性优于单独PMo12修饰电极,该修饰电极对IO3^-等有明显的电催化还原作用,其催化速率常数k可达1．34×10^5mol^-1·L·s^-1． 相似文献
4.
王升富 《黄冈师范学院学报》1995,(3)
采用电化学方法首次在导电基体玻碳电极上研制出磷钼杂多酸－聚吡咯薄膜修饰电极，其制备过程简便、快速，膜电极性能稳定、经久耐用；对膜电极的电化学性能进行了表征；探讨了电解质溶液、溶剂、pH值、扫速等因素对膜修饰电极伏安行为的影响；研究了膜修饰电极对氨酸根、溴酸根、碘酸根、三价铁离子、亚硝酸根、过氧化氢等物质的电催化还原作用． 相似文献
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采用电化学方法首次在导电基体玻碳电极上研制出磷钼杂多酸-聚吡咯薄膜修饰电极，其制备过程简便、快速，膜电极性能稳定、经久耐用；对膜电极的电化学性能进行了表征；探讨了电解质溶液、溶剂、pH值、扫速等因素对膜修饰电极伏安行为的影响；研究了膜修饰电极对氯酸根、漠酸根、碘酸根、三价铁离子、亚硝酸根、过氧化氢等物质的电催化还原作用． 相似文献
7.
本文将玻碳（GC）电极置入1mol·L－1NaNO3＋1mmol·L－1NiNO3＋1mmol·L－1K3Fe（CN）6混合溶液中进行循环伏安扫描（CV）可现场制备出性能稳定、厚度可控的NiHCF／GC修饰电极，且其电化学可逆性较NiHCF／Ni更好．研究表明对于在空白玻碳电极上氧化电位较高的神经传导物质多巴胶（DA），NiHCF膜可通过媒介作用使其氧化电位降低约200mV，大大提高其电子转移速率，利用这种电催化作用，可较好地对溶液中DA含量进行测定． 相似文献
8.
朱小红 《安徽教育学院学报》2009,27(6):73-75
用循环伏安法电聚合烟酰胺（3-吡啶甲酰胺）,在玻碳电极上的制备了聚合物膜修饰电极,考察其对NO2^-及共存离子的作用情况,该修饰电极对NO2^-有良好的电化学催化作用和选择性,用差分脉冲伏安法（DPV）测定其氧化电流在N0f浓度1．68×10^-6mol／L~-1．76×10^-3 mol／L范围内呈线性关系,线性相关系数为0．999,检测限5．6×10^-7 mol／L。 相似文献
9.
用卡拉胶将肌红蛋白（Mb）固定在玻碳电极（Gc）表面，制备了MB-卡拉胶膜修饰电极．包埋在卡拉胶中的Mb可以与电极发生直接电子传递．Mb-卡拉胶膜修饰电极在水／有机混合溶液中，表现出准可逆的直接电化学过程．式电势（E^0’=-0．407V）表明该电化学响应是MbFe（Ⅲ）／Fe（Ⅱ）电对的氧化还原．在一定范围内，溶液pH增加，Mb氧化还原式电势负移，且呈线性关系，说明Mb的电子传递过程伴随有质子的转移．扫描电镜显微研究表明，卡拉胶水凝胶与肌红蛋白之间有较强的作用，紫外光谱表明．血红素周围的微环境没有改变． 相似文献
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Xiao-ping Hong Yan Zhu Yan-zhen Zhang 《Journal of Zhejiang University. Science. B》2012,13(6):503-510
A highly sensitive amperometric sulfadiazine sensor fabricated by electrochemical deposition of poly(cobalt tetraaminophthalocyanine) (poly(CoIITAPc)) on the surface of a multi-walled carbon nanotubes-Nafion (MWCNTs-Nafion) modified electrode is described. This electrode showed a very attractive performance by combining the advantages of CoIITAPc, MWCNTs, and Nafion. Compared with the bare glassy carbon electrode (GCE) and the MWCNTs-Nafion modified electrode, the electrocatalytic activity of poly(CoIITAPc)-coated MWCNTs-Nafion GCE generated greatly improved electrochemical detections toward sulfadiazine including low oxidation potential, high current responses, and good anti-fouling performance. The oxidation peak currents of sulfadiazine obtained on the new modified electrode increased linearly while increasing the concentration of sulfadiazine from 0.5 to 43.5 μmol/L with the detection limit of 0.17 μmol/L. 相似文献
12.
利用壳聚糖（CTS）与香草醛合成改性壳聚糖席夫碱衍生物（VCG）,将其滴涂在玻碳电极表面形成薄膜,通过吸附富集电子介体Fe（CN）6^3-,使其固定在电极表面,制备了壳聚糖席夫碱衍生物修饰玻碳电极（Fe（CN）6^3-3-/VCG/GC）.以此修饰电极为工作电极,铂电极为对电极,饱和甘汞电极为参比电极,用循环伏安法对槲皮素的电化学行为进行了研究.在pH 6.0的磷酸盐缓冲液（PBS）中,氧化峰电流与槲皮素浓度在10^-4～10^-2 mol/L范围内呈比较好的线形关系,可用于槲皮素测定. 相似文献
13.
用阳离子型的聚二茂铁硅烷(PFS Cl-)与阴离子型的聚苯乙烯磺酸钠(PSS-Na )在石英、金材料表面上制备了PFS -PSS-多层自组装膜.多层自组装膜的逐层UV-Vis光谱表明,多层膜具有均匀有序的结构.多层自组装膜的电化学研究表明,膜的电化学性质与膜的层数和膜外表面聚电解质性质有关.当自组装膜层数较少时,膜电极过程表现出表面定域的单层膜性质;当膜层数较多时,膜内电活性物质的扩散成为控制步骤.而且,随着膜层数增加,膜内传质阻力增大,膜内扩散速率减小,膜的CV峰的可逆性降低. 相似文献
14.
制备了稀土多金属氧酸盐/多壁碳纳米管修饰Pt电极(POM-CNTs/Pt),研究了它对乙醇的电催化氧化。实验结果表明,与CNTs/Pt修饰电极相比,POM-CNTs/Pt修饰电极对乙醇电催化氧化速率明显增加,且对乙醇的催化氧化是扩散控制的电化学反应过程,该修饰电极具有良好的稳定性。 相似文献
15.
Low-Temperature Plasma Induced Grafting of 2-Methacryloyloxyethyl Phosphorylcholine onto Poly（tetrafluoroethylene） Films 总被引：1，自引：0，他引：1
Modification of poly(tetrafluoroethylene) (PTFE) films with 2-methacryloyloxyethyl phosphorylcholine (MPC) was performed by
low-temperature plasma treatment and grafting polymerization. Surface properties of PTFE were characterized by attenuated
total reflectance Fourier transform infrared (ATR-FTIR) spectra, X-ray photoelectron spectroscopy (XPS), and static contact
angle. The results show that MPC has been grafted onto PTFE film surface successfully. Contact angle for the modified PTFE
films in the water decreased from 108° to 58.25°, while surface energy increased from 17.52 mN/m to 45.47 mN/m. The effects
of plasma treatment time, monomer concentration and grafting time on degree of grafting were determined. In the meanwhile,
blood compatibility of the PTFE films was studied by checking thrombogenic time of blood plasma. 相似文献
16.
The electrochemical behaviors of lomefloxacin at a single-wall carbon nanotube-modified glassy carbon electrode have been investigated by cyclic voltammetry. In a Britton-Robinson buffer (pH 4. 5 ), lomefioxacin yields a sensitive and well-defined oxidation peak at ca. 1.24 V (vs. SCE) on the modified electrode. Compared with the bare glassy carbon electrode, the oxidation peak current of lomefloxacin significantly increases and the oxidation peak potential positively shifts. Under the optimal conditions, the interaction of lomefloxacin with bovine serum albumin is also investigated. The results indicate that an electrochemically inactive supramolecular complex is formed and the formation of complex between lomefloxacin and bovine serum albumin is an intercalation mechanism. The proposed methods offer a reference for the studies on the biological effects and action mechanism of lomefioxacin with albumins in vivo. 相似文献
17.
制备了稀土杂多酸盐修饰玻碳电极并研究了它对多巴胺的电催化特性。实验结果表明,该修饰电极对多巴胺有较好的电催化作用,且多巴胺在该修饰电极上的氧化受表面控制。稀土杂多酸盐修饰电极对多巴胺的催化氧化有良好的稳定性和重现性。 相似文献
18.
Low-density polyethylene ( LDPE) film andhigh-density polyethylene (HDPE) film are two typi-cal polyethylene films and widely used in electricaland electronic equipment, such as covering and corein ultra-high frequency cables[1—3]. It is well knownthat the unexpected defects in insulating polyethylenefilms under a high voltage will lead to the occurrenceof insulation degradation and act as the beginning ofinsulation breakdown. The insulation degradation ad-vances not only with the accumula… 相似文献
19.
碳糊电极和化学修饰碳糊电极的制备及应用综述 总被引：2，自引：0，他引：2
碳糊电极和化学修饰碳糊电极在电化学研究中起着非常重要的作用．从电极材料选用和修饰剂选择方面综述了碳糊电极和化学修饰碳糊电极制备的几种方法,概括了近年来化学修饰电极的应用． 相似文献
20.
ZHANG Zhao-di XU Long-jun SHI Jian-hang XU Wei WU Wen-li LIU Cheng-lun 《重庆大学学报(英文版)》2015,14(3):79-86
The effects of the electro-deposition conditions on the crystal structure and the properties of electrolytic manganese dioxide(EMD) were investigated in this paper. The results show that EMD was γ-crystal, with sand-like rough interface. The optimal preparation conditions of EMD were 30 min deposition time, and p H=1.0 in Mn SO4-H2SO4 solution at 50 ?C. Surfactant(P1) was conducive to the uniform and stable surface of γ-Mn O2 film, the impedance and the specific surface area of the electrode modified with γ-Mn O2 increased by 21.4 times and 75.6 times, respectively. The redox reversibility and the resolution ratio of characteristic peaks with the modified electrode were significantly improved in the benzodiazepines electrochemical reaction. The achievement illustrated that the controllable synthesis of γ-Mn O2 film thickness was practical in electrochemical sensors, and the determination reliability of benzodiazepines was improved with γ-Mn O2 modified electrodes used in environment monitoring technology. 相似文献