以廉价铁氧化合物为催化核心的三维石墨烯基亚硝酸盐电化学传感材料研究

发布时间：2018-04-11 02:09

本文选题：亚硝酸盐 + 电化学检测　；参考：《南京理工大学》2017年硕士论文

【摘要】：亚硝酸盐(Nitrite),是自然界中普遍存在的含氮盐,多数情况下主要是指亚硝酸钠(NaNO_2),广泛应用于工业、建筑业中,经常作为防腐剂处理肉制品。研究发现,亚硝酸盐过量摄入能诱发高铁血红蛋白症,也可以和胺类物质反应生成一种硝基化合物,在酸性条件下转化为致癌的亚硝胺,导致胃癌和食道癌。由于其危害性,世界卫生组织已经限定了饮用水中其含量不能超过3 mg/L,因此对于亚硝酸盐的灵敏检测至关重要。电化学方法是一种廉价、简便、即时、灵敏且准确的检测手段。而修饰电极的传感材料决定着电极响应优劣的最终效果。为了探索并实现电化学方法对亚硝酸盐的灵敏检测,本文分别构建了具有不同结构的两种纳米复合材料,Fe_(1.833)(OH)_(0.5)O_(2.5)/NG@PDDA和Fe_2O_3/H-C_3N_4/rGO,并对材料结构、电化学性能进行了系统性的研究。结果表明:(1)由于Fe_(1.833)(OH)_(0.5)O_(2.5)和聚二甲基二烯丙基氯化铵(PDDA)的协同效应使得Fe_(1.833)(OH)_(0.5)O_(2.5)/NG@PDDA修饰电极电极对NaNO_2的响应大大提高。电极具备宽线性范围 0.1～347 μmol/L,347～1275 μmol/L 和低检出限 0.027 μmol/L。(2)对于Fe_2O_3/H-C_3N_4/rGO传感材料,研究发现经过酸化的氮化碳(H-C_3N_4)可均匀吸附于还原石墨烯(rGO)的表面,H-C_3N_4大量的缺陷位有利于Fe_2O_3的生长,显著提高了电化学性能。检测的线性范围为:25nmol/I～30000μmol/L,检出限为18.43nmol/L,性能进一步提升。两种电极均在自来水作为实际样品中进行了检测,效果良好,稳定性较高,具有较高的实际应用潜力。
[Abstract]:Nitrite nitrite is a common nitrogen-containing salt in nature. In most cases, nitrite nitrite nitrite has been widely used in industry and construction industry, and is often used as a preservative to treat meat products.It has been found that excessive intake of nitrite can induce methemoglobin, or react with amine to form a nitro compound, which can be converted into carcinogenic nitrosamines under acidic conditions, leading to gastric cancer and esophageal cancer.Because of its harmfulness, the World Health Organization has limited its content in drinking water to no more than 3 mg / L, so it is very important for the sensitive detection of nitrite.Electrochemical method is a cheap, simple, immediate, sensitive and accurate detection method.The sensing material of the modified electrode determines the final effect of the electrode response.In order to explore and realize the electrochemical method for the sensitive detection of nitrite, two kinds of nanocomposites with different structures have been constructed in this paper. The structure and electrochemical properties of the nanocomposites have been systematically studied.The results showed that the response of Fe_(1.833)(OH)_(0.5)O_(2.5)/NG@PDDA modified electrode to NaNO_2 was greatly improved due to the synergistic effect of FeStue (1.833) and Poly (Dimethyldiallylammonium Chloride) (PDimethyldiallylammonium Chloride).The electrode has a wide linear range of 0.1 ~ 347 渭 mol 路L ~ (-1) 7 ~ (75) 渭 mol/L and a low detection limit of 0.027 渭 mol / L ~ (2). For Fe_2O_3/H-C_3N_4/rGO sensing materials, it is found that the acidic carbon nitride H-C _ 3N _ 4) can be uniformly adsorbed on the surface of reduced graphene (rgog), and that a large number of defect sites are favorable to the growth of Fe_2O_3.The electrochemical performance was improved significantly.The linear range of detection is 30 000 渭 mol / L and the detection limit is 18. 43 nmol / L, and the performance is further improved.The two kinds of electrodes were tested in tap water as a practical sample, with good effect, high stability and high practical application potential.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O657.1;TP212.2

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