本文選題：電化學(xué)傳感器 + 鄰苯二酚��； 參考：《西安建筑科技大學(xué)》2015年碩士論文

【摘要】：酚類污染物是一類會對土壤和水資源造成嚴(yán)重污染的有機污染物,其含量監(jiān)測對人類健康和環(huán)境保護(hù)意義重大。目前已有多種方法用于此類物質(zhì)的分析檢測,其中電化學(xué)方法因其高效、靈敏、操作簡單等優(yōu)點被廣范用于各種酚類物質(zhì)的檢測中。新型傳感界面的構(gòu)建是實現(xiàn)電化學(xué)檢測的關(guān)鍵。本論文制備了三種新型化學(xué)修飾電極并基于此構(gòu)建了新型傳感界面,用于環(huán)境污染物中酚類物質(zhì)的電化學(xué)檢測。該研究為環(huán)境中酚類物質(zhì)的高靈敏度、高選擇性的檢測提供了新思路,同時對于拓展電化學(xué)傳感界面的應(yīng)用范圍具有重要意義。本論文共分四章,主要研究內(nèi)容包括:1.通過電聚合的方法成功制備了聚鈹試劑修飾碳糊電極(PBL-II/CPE),分別采用循環(huán)伏安法(CV)和交流阻抗法(EIS)對PBL-II/CPE的電化學(xué)性質(zhì)進(jìn)行了表征,并對鄰苯二酚(PC)和對苯二酚(HQ)進(jìn)行了選擇性測定,二者檢出限分別為0.8μmol/L和1.0μmol/L(三倍的基線噪音S/N=3)。同時使用該方法對水樣中PC和HQ進(jìn)行了定量分析,回收率在99~103%,表明該方法可用于水質(zhì)中酚類物質(zhì)的測定。2.采用水熱合成法制備了納米氫氧化鑭,基于此構(gòu)建了基于納米氫氧化鑭和煙酸的復(fù)合材料新型電化學(xué)傳感器PNA/La(OH)3/CPE。通過CV和EIS研究了雙酚A(BPA)在PNA/La(OH)3/CPE上的電化學(xué)行為。結(jié)果表明,納米氫氧化鑭和煙酸的協(xié)同催化作用使該傳感器表現(xiàn)出較高的電催化能力。BPA在PNA/La(OH)3/CPE的線性范圍為0.05~65μmol/L,檢出限為0.02μmol/L(S/N=3)。該方法較傳統(tǒng)電極具有檢出限低、靈敏度高,線性范圍寬的特點。3.通過滴涂法將碳納米管固定到碳糊電極表面,再采用計時電流法將納米金成功沉積到了碳納米管上,制得納米金/碳納米管復(fù)合修飾電極(AuNPs/CNT/CPE),并采用SEM和電化學(xué)方法對AuNPs/CNT/CPE進(jìn)行了表征。采用CV研究了BPA在該修飾電極上的電化學(xué)行為。研究發(fā)現(xiàn),AuNPs/CNT/CPE對BPA具有良好的電催化性能。將該修飾電極用于BPA的檢測,檢出限為0.3nmol/L(S/N=3),與其他修飾電極相比AuNPs/CNT/CPE具有較低的檢出限,較寬的線性范圍。對AuNPs/CNT/CPE的穩(wěn)定性和抗干擾性分別進(jìn)行了研究,效果良好。
[Abstract]:Phenolic pollutants are a kind of organic pollutants which can cause serious pollution to soil and water resources. Its content monitoring is of great significance to human health and environmental protection. At present, many methods have been used for the analysis and detection of these substances, among which electrochemical method has been widely used in the detection of phenolic substances because of its high efficiency, sensitivity and simple operation. The construction of new sensing interface is the key to realize electrochemical detection. In this paper, three novel chemically modified electrodes were prepared and a novel sensing interface was constructed for the electrochemical detection of phenols in environmental pollutants. This study provides a new idea for the detection of high sensitivity and selectivity of phenolic substances in the environment, and it is of great significance to expand the application of electrochemical sensing interface. This thesis is divided into four chapters, the main research contents include: 1. Poly (beryllium) modified carbon paste electrode (PBL-II / CPEN) was successfully prepared by electropolymerization. The electrochemical properties of PBL-II/CPE were characterized by cyclic voltammetry (CV) and AC impedance spectroscopy (PBL-II/CPE). The detection limits were 0.8 渭 mol/L and 1.0 渭 mol / L, respectively. At the same time, the method was used for quantitative analysis of PC and HQ in water samples. The recovery rate of PC and HQ in water samples was 99 ~ 1033, which indicated that the method could be applied to the determination of phenolic substances in water. Nano-lanthanum hydroxide was prepared by hydrothermal synthesis. Based on this, a novel electrochemical sensor PNA-LaOHO _ 3 / CPE based on nano-lanthanum hydroxide and nicotinic acid was constructed. The electrochemical behavior of bisphenol A (BPA) on PNA/La(OH)3/CPE was studied by CV and EIS. The results show that the synergistic catalysis of lanthanum hydroxide and nicotinic acid makes the sensor have a high electrocatalytic ability. The linear range of BPA in PNA/La(OH)3/CPE is 0.05 ~ 65 渭 mol / L and the detection limit is 0.02 渭 mol / L ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1). The method has the advantages of lower detection limit, higher sensitivity and wider linear range than traditional electrode. Carbon nanotubes were immobilized on the surface of the carbon paste electrode by drip coating method, and the gold nanoparticles were successfully deposited on carbon nanotubes by chronoamperometric method. Gold / carbon nanotube composite modified electrode was prepared and characterized by SEM and electrochemical method. The electrochemical behavior of BPA on the modified electrode was studied by CV. It is found that AuNPs / CNT / CPE has good electrocatalytic performance for BPA. The detection limit of the modified electrode for BPA is 0.3 nmol / L ~ (-1) S / N ~ (3) N ~ (3 +). Compared with other modified electrodes, the detection limit of AuNPs/CNT/CPE is lower and the linear range is wider. The stability and anti-interference of AuNPs/CNT/CPE are studied, and the results are good.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：O657.1;X830

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本文編號：1829395